FIRING MEMBER PIN ANGLE

[0001] The present invention relates to surgical instruments and, in various arrangements, to surgical stapling and cutting instruments and staple cartridges for use therewith that are designed to staple and cut tissue.

[0098] Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate various embodiments of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

[0099] Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016 and which are each herein incorporated by reference in their respective entireties:

[0100] U.S. patent application Ser. No. 15/386,185, entitled SURGICAL STAPLING INSTRUMENTS AND REPLACEABLE TOOL ASSEMBLIES THEREOF;

[0101] U.S. patent application Ser. No. 15/386,230, entitled ARTICULATABLE SURGICAL STAPLING INSTRUMENTS;

[0102] U.S. patent application Ser. No. 15/386,221, entitled LOCKOUT ARRANGEMENTS FOR SURGICAL END EFFECTORS;

[0103] U.S. patent application Ser. No. 15/386,209, entitled SURGICAL END EFFECTORS AND FIRING MEMBERS THEREOF;

[0104] U.S. patent application Ser. No. 15/386,198, entitled LOCKOUT ARRANGEMENTS FOR SURGICAL END EFFECTORS AND REPLACEABLE TOOL ASSEMBLIES; and

[0105] U.S. patent application Ser. No. 15/386,240, entitled SURGICAL END EFFECTORS AND ADAPTABLE FIRING MEMBERS THEREFOR.

[0106] Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016 and which are each herein incorporated by reference in their respective entireties:

[0107] U.S. patent application Ser. No. 15/385,939, entitled STAPLE CARTRIDGES AND ARRANGEMENTS OF STAPLES AND STAPLE CAVITIES THEREIN;

[0108] U.S. patent application Ser. No. 15/385,941, entitled SURGICAL TOOL ASSEMBLIES WITH CLUTCHING ARRANGEMENTS FOR SHIFTING BETWEEN CLOSURE SYSTEMS WITH CLOSURE STROKE REDUCTION FEATURES AND ARTICULATION AND FIRING SYSTEMS;

[0109] U.S. patent application Ser. No. 15/385,943, entitled SURGICAL STAPLING INSTRUMENTS AND STAPLE-FORMING ANVILS;

[0110] U.S. patent application Ser. No. 15/385,950, entitled SURGICAL TOOL ASSEMBLIES WITH CLOSURE STROKE REDUCTION FEATURES;

[0111] U.S. patent application Ser. No. 15/385,945, entitled STAPLE CARTRIDGES AND ARRANGEMENTS OF STAPLES AND STAPLE CAVITIES THEREIN;

[0112] U.S. patent application Ser. No. 15/385,946, entitled SURGICAL STAPLING INSTRUMENTS AND STAPLE-FORMING ANVILS;

[0113] U.S. patent application Ser. No. 15/385,951, entitled SURGICAL INSTRUMENTS WITH JAW OPENING FEATURES FOR INCREASING A JAW OPENING DISTANCE;

[0114] U.S. patent application Ser. No. 15/385,953, entitled METHODS OF STAPLING TISSUE;

[0115] U.S. patent application Ser. No. 15/385,954, entitled FIRING MEMBERS WITH NON-PARALLEL JAW ENGAGEMENT FEATURES FOR SURGICAL END EFFECTORS;

[0116] U.S. patent application Ser. No. 15/385,955, entitled SURGICAL END EFFECTORS WITH EXPANDABLE TISSUE STOP ARRANGEMENTS;

[0117] U.S. patent application Ser. No. 15/385,948, entitled SURGICAL STAPLING INSTRUMENTS AND STAPLE-FORMING ANVILS;

[0118] U.S. patent application Ser. No. 15/385,956, entitled SURGICAL INSTRUMENTS WITH POSITIVE JAW OPENING FEATURES;

[0119] U.S. patent application Ser. No. 15/385,958, entitled SURGICAL INSTRUMENTS WITH LOCKOUT ARRANGEMENTS FOR PREVENTING FIRING SYSTEM ACTUATION UNLESS AN UNSPENT STAPLE CARTRIDGE IS PRESENT; and

[0120] U.S. patent application Ser. No. 15/385,947, entitled STAPLE CARTRIDGES AND ARRANGEMENTS OF STAPLES AND STAPLE CAVITIES THEREIN.

[0121] Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016 and which are each herein incorporated by reference in their respective entireties:

[0122] U.S. patent application Ser. No. 15/385,896, entitled METHOD FOR RESETTING A FUSE OF A SURGICAL INSTRUMENT SHAFT;

[0123] U.S. patent application Ser. No. 15/385,898, entitled STAPLE FORMING POCKET ARRANGEMENT TO ACCOMMODATE DIFFERENT TYPES OF STAPLES;

[0124] U.S. patent application Ser. No. 15/385,899, entitled SURGICAL INSTRUMENT COMPRISING IMPROVED JAW CONTROL;

[0125] U.S. patent application Ser. No. 15/385,901, entitled STAPLE CARTRIDGE AND STAPLE CARTRIDGE CHANNEL COMPRISING WINDOWS DEFINED THEREIN;

[0126] U.S. patent application Ser. No. 15/385,902, entitled SURGICAL INSTRUMENT COMPRISING A CUTTING MEMBER;

[0127] U.S. patent application Ser. No. 15/385,904, entitled STAPLE FIRING MEMBER COMPRISING A MISSING CARTRIDGE AND/OR SPENT CARTRIDGE LOCKOUT;

[0128] U.S. patent application Ser. No. 15/385,905, entitled FIRING ASSEMBLY COMPRISING A LOCKOUT;

[0129] U.S. patent application Ser. No. 15/385,907, entitled SURGICAL INSTRUMENT SYSTEM COMPRISING AN END EFFECTOR LOCKOUT AND A FIRING ASSEMBLY LOCKOUT;

[0130] U.S. patent application Ser. No. 15/385,908, entitled FIRING ASSEMBLY COMPRISING A FUSE; and

[0131] U.S. patent application Ser. No. 15/385,909, entitled FIRING ASSEMBLY COMPRISING A MULTIPLE FAILED-STATE FUSE.

[0132] Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016 and which are each herein incorporated by reference in their respective entireties:

[0133] U.S. patent application Ser. No. 15/385,920, entitled STAPLE FORMING POCKET ARRANGEMENTS;

[0134] U.S. patent application Ser. No. 15/385,913, entitled ANVIL ARRANGEMENTS FOR SURGICAL STAPLERS;

[0135] U.S. patent application Ser. No. 15/385,914, entitled METHOD OF DEFORMING STAPLES FROM TWO DIFFERENT TYPES OF STAPLE CARTRIDGES WITH THE SAME SURGICAL STAPLING INSTRUMENT;

[0136] U.S. patent application Ser. No. 15/385,893, entitled BILATERALLY ASYMMETRIC STAPLE FORMING POCKET PAIRS;

[0137] U.S. patent application Ser. No. 15/385,929, entitled CLOSURE MEMBERS WITH CAM SURFACE ARRANGEMENTS FOR SURGICAL INSTRUMENTS WITH SEPARATE AND DISTINCT CLOSURE AND FIRING SYSTEMS;

[0138] U.S. patent application Ser. No. 15/385,911, entitled SURGICAL STAPLERS WITH INDEPENDENTLY ACTUATABLE CLOSING AND FIRING SYSTEMS;

[0139] U.S. patent application Ser. No. 15/385,927, entitled SURGICAL STAPLING INSTRUMENTS WITH SMART STAPLE CARTRIDGES;

[0140] U.S. patent application Ser. No. 15/385,917, entitled STAPLE CARTRIDGE COMPRISING STAPLES WITH DIFFERENT CLAMPING BREADTHS;

[0141] U.S. patent application Ser. No. 15/385,900, entitled STAPLE FORMING POCKET ARRANGEMENTS COMPRISING PRIMARY SIDEWALLS AND POCKET SIDEWALLS;

[0142] U.S. patent application Ser. No. 15/385,931, entitled NO-CARTRIDGE AND SPENT CARTRIDGE LOCKOUT ARRANGEMENTS FOR SURGICAL STAPLERS;

[0143] U.S. patent application Ser. No. 15/385,897, entitled STAPLE FORMING POCKET ARRANGEMENTS COMPRISING ZONED FORMING SURFACE GROOVES;

[0144] U.S. patent application Ser. No. 15/385,922, entitled SURGICAL INSTRUMENT WITH MULTIPLE FAILURE RESPONSE MODES;

[0145] U.S. patent application Ser. No. 15/385,924, entitled SURGICAL INSTRUMENT WITH PRIMARY AND SAFETY PROCESSORS;

[0146] U.S. patent application Ser. No. 15/385,912, entitled SURGICAL INSTRUMENTS WITH JAWS THAT ARE PIVOTABLE ABOUT A FIXED AXIS AND INCLUDE SEPARATE AND DISTINCT CLOSURE AND FIRING SYSTEMS;

[0147] U.S. patent application Ser. No. 15/385,910, entitled ANVIL HAVING A KNIFE SLOT WIDTH;

[0148] U.S. patent application Ser. No. 15/385,903, entitled CLOSURE MEMBER ARRANGEMENTS FOR SURGICAL INSTRUMENTS; and

[0149] U.S. patent application Ser. No. 15/385,906, entitled FIRING MEMBER PIN CONFIGURATIONS.

[0150] Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016 and which are each herein incorporated by reference in their respective entireties:

[0151] U.S. patent application Ser. No. 15/386,188, entitled STEPPED STAPLE CARTRIDGE WITH ASYMMETRICAL STAPLES;

[0152] U.S. patent application Ser. No. 15/386,192, entitled STEPPED STAPLE CARTRIDGE WITH TISSUE RETENTION AND GAP SETTING FEATURES;

[0153] U.S. patent application Ser. No. 15,386,206, entitled STAPLE CARTRIDGE WITH DEFORMABLE DRIVER RETENTION FEATURES;

[0154] U.S. patent application Ser. No. 15/386,226, entitled DURABILITY FEATURES FOR END EFFECTORS AND FIRING ASSEMBLIES OF SURGICAL STAPLING INSTRUMENTS;

[0155] U.S. patent application Ser. No. 15/386,222, entitled SURGICAL STAPLING INSTRUMENTS HAVING END EFFECTORS WITH POSITIVE OPENING FEATURES; and

[0156] U.S. patent application Ser. No. 15/386,236, entitled CONNECTION PORTIONS FOR DISPOSABLE LOADING UNITS FOR SURGICAL STAPLING INSTRUMENTS.

[0157] Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016 and which are each herein incorporated by reference in their respective entireties:

[0158] U.S. patent application Ser. No. 15/385,887, entitled METHOD FOR ATTACHING A SHAFT ASSEMBLY TO A SURGICAL INSTRUMENT AND, ALTERNATIVELY, TO A SURGICAL ROBOT;

[0159] U.S. patent application Ser. No. 15/385,889, entitled SHAFT ASSEMBLY COMPRISING A MANUALLY-OPERABLE RETRACTION SYSTEM FOR USE WITH A MOTORIZED SURGICAL INSTRUMENT SYSTEM;

[0160] U.S. patent application Ser. No. 15/385,890, entitled SHAFT ASSEMBLY COMPRISING SEPARATELY ACTUATABLE AND RETRACTABLE SYSTEMS;

[0161] U.S. patent application Ser. No. 15/385,891, entitled SHAFT ASSEMBLY COMPRISING A CLUTCH CONFIGURED TO ADAPT THE OUTPUT OF A ROTARY FIRING MEMBER TO TWO DIFFERENT SYSTEMS;

[0162] U.S. patent application Ser. No. 15/385,892, entitled SURGICAL SYSTEM COMPRISING A FIRING MEMBER ROTATABLE INTO AN ARTICULATION STATE TO ARTICULATE AN END EFFECTOR OF THE SURGICAL SYSTEM;

[0163] U.S. patent application Ser. No. 15/385,894, entitled SHAFT ASSEMBLY COMPRISING A LOCKOUT; and

[0164] U.S. patent application Ser. No. 15/385,895, entitled SHAFT ASSEMBLY COMPRISING FIRST AND SECOND ARTICULATION LOCKOUTS.

[0165] Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016 and which are each herein incorporated by reference in their respective entireties:

[0166] U.S. patent application Ser. No. 15/385,916, entitled SURGICAL STAPLING SYSTEMS;

[0167] U.S. patent application Ser. No. 15/385,918, entitled SURGICAL STAPLING SYSTEMS;

[0168] U.S. patent application Ser. No. 15/385,919, entitled SURGICAL STAPLING SYSTEMS;

[0169] U.S. patent application Ser. No. 15/385,921, entitled SURGICAL STAPLE CARTRIDGE WITH MOVABLE CAMMING MEMBER CONFIGURED TO DISENGAGE FIRING MEMBER LOCKOUT FEATURES;

[0170] U.S. patent application Ser. No. 15/385,923, entitled SURGICAL STAPLING SYSTEMS;

[0171] U.S. patent application Ser. No. 15/385,925, entitled JAW ACTUATED LOCK ARRANGEMENTS FOR PREVENTING ADVANCEMENT OF A FIRING MEMBER IN A SURGICAL END EFFECTOR UNLESS AN UNFIRED CARTRIDGE IS INSTALLED IN THE END EFFECTOR;

[0172] U.S. patent application Ser. No. 15/385,926, entitled AXIALLY MOVABLE CLOSURE SYSTEM ARRANGEMENTS FOR APPLYING CLOSURE MOTIONS TO JAWS OF SURGICAL INSTRUMENTS;

[0173] U.S. patent application Ser. No. 15/385,928, entitled PROTECTIVE COVER ARRANGEMENTS FOR A JOINT INTERFACE BETWEEN A MOVABLE JAW AND ACTUATOR SHAFT OF A SURGICAL INSTRUMENT;

[0174] U.S. patent application Ser. No. 15/385,930, entitled SURGICAL END EFFECTOR WITH TWO SEPARATE COOPERATING OPENING FEATURES FOR OPENING AND CLOSING END EFFECTOR JAWS;

[0175] U.S. patent application Ser. No. 15/385,932, entitled ARTICULATABLE SURGICAL END EFFECTOR WITH ASYMMETRIC SHAFT ARRANGEMENT;

[0176] U.S. patent application Ser. No. 15/385,933, entitled ARTICULATABLE SURGICAL INSTRUMENT WITH INDEPENDENT PIVOTABLE LINKAGE DISTAL OF AN ARTICULATION LOCK;

[0177] U.S. patent application Ser. No. 15/385,934, entitled ARTICULATION LOCK ARRANGEMENTS FOR LOCKING AN END EFFECTOR IN AN ARTICULATED POSITION IN RESPONSE TO ACTUATION OF A JAW CLOSURE SYSTEM;

[0178] U.S. patent application Ser. No. 15/385,935, entitled LATERALLY ACTUATABLE ARTICULATION LOCK ARRANGEMENTS FOR LOCKING AN END EFFECTOR OF A SURGICAL INSTRUMENT IN AN ARTICULATED CONFIGURATION; and

[0179] U.S. patent application Ser. No. 15/385,936, entitled ARTICULATABLE SURGICAL INSTRUMENTS WITH ARTICULATION STROKE AMPLIFICATION FEATURES.

[0180] Applicant of the present application owns the following U.S. Patent Applications that were filed on Jun. 24, 2016 and which are each herein incorporated by reference in their respective entireties:

[0181] U.S. patent application Ser. No. 15/191,775, entitled STAPLE CARTRIDGE COMPRISING WIRE STAPLES AND STAMPED STAPLES;

[0182] U.S. patent application Ser. No. 15/191,807, entitled STAPLING SYSTEM FOR USE WITH WIRE STAPLES AND STAMPED STAPLES;

[0183] U.S. patent application Ser. No. 15/191,834, entitled STAMPED STAPLES AND STAPLE CARTRIDGES USING THE SAME;

[0184] U.S. patent application Ser. No. 15/191,788, entitled STAPLE CARTRIDGE COMPRISING OVERDRIVEN STAPLES; and

[0185] U.S. patent application Ser. No. 15/191,818, entitled STAPLE CARTRIDGE COMPRISING OFFSET LONGITUDINAL STAPLE ROWS.

[0186] Applicant of the present application owns the following U.S. Patent Applications that were filed on Jun. 24, 2016 and which are each herein incorporated by reference in their respective entireties:

[0187] U.S. Design patent application Ser. No. 29/569,218, entitled SURGICAL FASTENER;

[0188] U.S. Design patent application Ser. No. 29/569,227, entitled SURGICAL FASTENER;

[0189] U.S. Design patent application Ser. No. 29/569,259, entitled SURGICAL FASTENER CARTRIDGE; and

[0190] U.S. Design patent application Ser. No. 29/569,264, entitled SURGICAL FASTENER CARTRIDGE.

[0191] Applicant of the present application owns the following patent applications that were filed on Apr. 1, 2016 and which are each herein incorporated by reference in their respective entirety:

[0192] U.S. patent application Ser. No. 15/089,325, entitled METHOD FOR OPERATING A SURGICAL STAPLING SYSTEM;

[0193] U.S. patent application Ser. No. 15/089,321, entitled MODULAR SURGICAL STAPLING SYSTEM COMPRISING A DISPLAY;

[0194] U.S. patent application Ser. No. 15/089,326, entitled SURGICAL STAPLING SYSTEM COMPRISING A DISPLAY INCLUDING A RE-ORIENTABLE DISPLAY FIELD;

[0195] U.S. patent application Ser. No. 15/089,263, entitled SURGICAL INSTRUMENT HANDLE ASSEMBLY WITH RECONFIGURABLE GRIP PORTION;

[0196] U.S. patent application Ser. No. 15/089,262, entitled ROTARY POWERED SURGICAL INSTRUMENT WITH MANUALLY ACTUATABLE BAILOUT SYSTEM;

[0197] U.S. patent application Ser. No. 15/089,277, entitled SURGICAL CUTTING AND STAPLING END EFFECTOR WITH ANVIL CONCENTRIC DRIVE MEMBER;

[0198] U.S. patent application Ser. No. 15/089,296, entitled INTERCHANGEABLE SURGICAL TOOL ASSEMBLY WITH A SURGICAL END EFFECTOR THAT IS SELECTIVELY ROTATABLE ABOUT A SHAFT AXIS;

[0199] U.S. patent application Ser. No. 15/089,258, entitled SURGICAL STAPLING SYSTEM COMPRISING A SHIFTABLE TRANSMISSION;

[0200] U.S. patent application Ser. No. 15/089,278, entitled SURGICAL STAPLING SYSTEM CONFIGURED TO PROVIDE SELECTIVE CUTTING OF TISSUE;

[0201] U.S. patent application Ser. No. 15/089,284, entitled SURGICAL STAPLING SYSTEM COMPRISING A CONTOURABLE SHAFT;

[0202] U.S. patent application Ser. No. 15/089,295, entitled SURGICAL STAPLING SYSTEM COMPRISING A TISSUE COMPRESSION LOCKOUT;

[0203] U.S. patent application Ser. No. 15/089,300, entitled SURGICAL STAPLING SYSTEM COMPRISING AN UNCLAMPING LOCKOUT;

[0204] U.S. patent application Ser. No. 15/089,196, entitled SURGICAL STAPLING SYSTEM COMPRISING A JAW CLOSURE LOCKOUT;

[0205] U.S. patent application Ser. No. 15/089,203, entitled SURGICAL STAPLING SYSTEM COMPRISING A JAW ATTACHMENT LOCKOUT;

[0206] U.S. patent application Ser. No. 15/089,210, entitled SURGICAL STAPLING SYSTEM COMPRISING A SPENT CARTRIDGE LOCKOUT;

[0207] U.S. patent application Ser. No. 15/089,324, entitled SURGICAL INSTRUMENT COMPRISING A SHIFTING MECHANISM;

[0208] U.S. patent application Ser. No. 15/089,335, entitled SURGICAL STAPLING INSTRUMENT COMPRISING MULTIPLE LOCKOUTS;

[0209] U.S. patent application Ser. No. 15/089,339, entitled SURGICAL STAPLING INSTRUMENT;

[0210] U.S. patent application Ser. No. 15/089,253, entitled SURGICAL STAPLING SYSTEM CONFIGURED TO APPLY ANNULAR ROWS OF STAPLES HAVING DIFFERENT HEIGHTS;

[0211] U.S. patent application Ser. No. 15/089,304, entitled SURGICAL STAPLING SYSTEM COMPRISING A GROOVED FORMING POCKET;

[0212] U.S. patent application Ser. No. 15/089,331, entitled ANVIL MODIFICATION MEMBERS FOR SURGICAL STAPLERS;

[0213] U.S. patent application Ser. No. 15/089,336, entitled STAPLE CARTRIDGES WITH ATRAUMATIC FEATURES;

[0214] U.S. patent application Ser. No. 15/089,312, entitled CIRCULAR STAPLING SYSTEM COMPRISING AN INCISABLE TISSUE SUPPORT;

[0215] U.S. patent application Ser. No. 15/089,309, entitled CIRCULAR STAPLING SYSTEM COMPRISING ROTARY FIRING SYSTEM; and

[0216] U.S. patent application Ser. No. 15/089,349, entitled CIRCULAR STAPLING SYSTEM COMPRISING LOAD CONTROL.

[0217] Applicant of the present application also owns the U.S. Patent Applications identified below which were filed on Dec. 31, 2015 which are each herein incorporated by reference in their respective entirety:

[0218] U.S. patent application Ser. No. 14/984,488, entitled MECHANISMS FOR COMPENSATING FOR BATTERY PACK FAILURE IN POWERED SURGICAL INSTRUMENTS;

[0219] U.S. patent application Ser. No. 14/984,525, entitled MECHANISMS FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL INSTRUMENTS; and

[0220] U.S. patent application Ser. No. 14/984,552, entitled SURGICAL INSTRUMENTS WITH SEPARABLE MOTORS AND MOTOR CONTROL CIRCUITS.

[0221] Applicant of the present application also owns the U.S. Patent Applications identified below which were filed on Feb. 9, 2016 which are each herein incorporated by reference in their respective entirety:

[0222] U.S. patent application Ser. No. 15/019,220, entitled SURGICAL INSTRUMENT WITH ARTICULATING AND AXIALLY TRANSLATABLE END EFFECTOR;

[0223] U.S. patent application Ser. No. 15/019,228, entitled SURGICAL INSTRUMENTS WITH MULTIPLE LINK ARTICULATION ARRANGEMENTS;

[0224] U.S. patent application Ser. No. 15/019,196, entitled SURGICAL INSTRUMENT ARTICULATION MECHANISM WITH SLOTTED SECONDARY CONSTRAINT;

[0225] U.S. patent application Ser. No. 15/019,206, entitled SURGICAL INSTRUMENTS WITH AN END EFFECTOR THAT IS HIGHLY ARTICULATABLE RELATIVE TO AN ELONGATE SHAFT ASSEMBLY;

[0226] U.S. patent application Ser. No. 15/019,215, entitled SURGICAL INSTRUMENTS WITH NON-SYMMETRICAL ARTICULATION ARRANGEMENTS;

[0227] U.S. patent application Ser. No. 15/019,227, entitled ARTICULATABLE SURGICAL INSTRUMENTS WITH SINGLE ARTICULATION LINK ARRANGEMENTS;

[0228] U.S. patent application Ser. No. 15/019,235, entitled SURGICAL INSTRUMENTS WITH TENSIONING ARRANGEMENTS FOR CABLE DRIVEN ARTICULATION SYSTEMS;

[0229] U.S. patent application Ser. No. 15/019,230, entitled ARTICULATABLE SURGICAL INSTRUMENTS WITH OFF-AXIS FIRING BEAM ARRANGEMENTS; and

[0230] U.S. patent application Ser. No. 15/019,245, entitled SURGICAL INSTRUMENTS WITH CLOSURE STROKE REDUCTION ARRANGEMENTS.

[0231] Applicant of the present application also owns the U.S. Patent Applications identified below which were filed on Feb. 12, 2016 which are each herein incorporated by reference in their respective entirety:

[0232] U.S. patent application Ser. No. 15/043,254, entitled MECHANISMS FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL INSTRUMENTS;

[0233] U.S. patent application Ser. No. 15/043,259, entitled MECHANISMS FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL INSTRUMENTS;

[0234] U.S. patent application Ser. No. 15/043,275, entitled MECHANISMS FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL INSTRUMENTS; and

[0235] U.S. patent application Ser. No. 15/043,289, entitled MECHANISMS FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL INSTRUMENTS.

[0236] Applicant of the present application owns the following patent applications that were filed on Jun. 18, 2015 and which are each herein incorporated by reference in their respective entirety:

[0237] U.S. patent application Ser. No. 14/742,925, entitled SURGICAL END EFFECTORS WITH POSITIVE JAW OPENING ARRANGEMENTS;

[0238] U.S. patent application Ser. No. 14/742,941, entitled SURGICAL END EFFECTORS WITH DUAL CAM ACTUATED JAW CLOSING FEATURES;

[0239] U.S. patent application Ser. No. 14/742,914, entitled MOVABLE FIRING BEAM SUPPORT ARRANGEMENTS FOR ARTICULATABLE SURGICAL INSTRUMENTS;

[0240] U.S. patent application Ser. No. 14/742,900, entitled ARTICULATABLE SURGICAL INSTRUMENTS WITH COMPOSITE FIRING BEAM STRUCTURES WITH CENTER FIRING SUPPORT MEMBER FOR ARTICULATION SUPPORT;

[0241] U.S. patent application Ser. No. 14/742,885, entitled DUAL ARTICULATION DRIVE SYSTEM ARRANGEMENTS FOR ARTICULATABLE SURGICAL INSTRUMENTS; and

[0242] U.S. patent application Ser. No. 14/742,876, entitled PUSH/PULL ARTICULATION DRIVE SYSTEMS FOR ARTICULATABLE SURGICAL INSTRUMENTS.

[0243] Applicant of the present application owns the following patent applications that were filed on Mar. 6, 2015 and which are each herein incorporated by reference in their respective entirety:

[0244] U.S. patent application Ser. No. 14/640,746, entitled POWERED SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2016/0256184;

[0245] U.S. patent application Ser. No. 14/640,795, entitled MULTIPLE LEVEL THRESHOLDS TO MODIFY OPERATION OF POWERED SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2016/02561185;

[0246] U.S. patent application Ser. No. 14/640,832, entitled ADAPTIVE TISSUE COMPRESSION TECHNIQUES TO ADJUST CLOSURE RATES FOR MULTIPLE TISSUE TYPES, now U.S. Patent Application Publication No. 2016/0256154;

[0247] U.S. patent application Ser. No. 14/640,935, entitled OVERLAID MULTI SENSOR RADIO FREQUENCY (RF) ELECTRODE SYSTEM TO MEASURE TISSUE COMPRESSION, now U.S. Patent Application Publication No. 2016/0256071;

[0248] U.S. patent application Ser. No. 14/640,831, entitled MONITORING SPEED CONTROL AND PRECISION INCREMENTING OF MOTOR FOR POWERED SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2016/0256153;

[0249] U.S. patent application Ser. No. 14/640,859, entitled TIME DEPENDENT EVALUATION OF SENSOR DATA TO DETERMINE STABILITY, CREEP, AND VISCOELASTIC ELEMENTS OF MEASURES, now U.S. Patent Application Publication No. 2016/0256187;

[0250] U.S. patent application Ser. No. 14/640,817, entitled INTERACTIVE FEEDBACK SYSTEM FOR POWERED SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2016/0256186;

[0251] U.S. patent application Ser. No. 14/640,844, entitled CONTROL TECHNIQUES AND SUB-PROCESSOR CONTAINED WITHIN MODULAR SHAFT WITH SELECT CONTROL PROCESSING FROM HANDLE, now U.S. Patent Application Publication No. 2016/0256155;

[0252] U.S. patent application Ser. No. 14/640,837, entitled SMART SENSORS WITH LOCAL SIGNAL PROCESSING, now U.S. Patent Application Publication No. 2016/0256163;

[0253] U.S. patent application Ser. No. 14/640,765, entitled SYSTEM FOR DETECTING THE MIS-INSERTION OF A STAPLE CARTRIDGE INTO A SURGICAL STAPLER, now U.S. Patent Application Publication No. 2016/0256160;

[0254] U.S. patent application Ser. No. 14/640,799, entitled SIGNAL AND POWER COMMUNICATION SYSTEM POSITIONED ON A ROTATABLE SHAFT, now U.S. Patent Application Publication No. 2016/0256162; and

[0255] U.S. patent application Ser. No. 14/640,780, entitled SURGICAL INSTRUMENT COMPRISING A LOCKABLE BATTERY HOUSING, now U.S. Patent Application Publication No. 2016/0256161.

[0256] Applicant of the present application owns the following patent applications that were filed on Feb. 27, 2015, and which are each herein incorporated by reference in their respective entirety:

[0257] U.S. patent application Ser. No. 14/633,576, entitled SURGICAL INSTRUMENT SYSTEM COMPRISING AN INSPECTION STATION, now U.S. Patent Application Publication No. 2016/0249919;

[0258] U.S. patent application Ser. No. 14/633,546, entitled SURGICAL APPARATUS CONFIGURED TO ASSESS WHETHER A PERFORMANCE PARAMETER OF THE SURGICAL APPARATUS IS WITHIN AN ACCEPTABLE PERFORMANCE BAND, now U.S. Patent Application Publication No. 2016/0249915;

[0259] U.S. patent application Ser. No. 14/633,560, entitled SURGICAL CHARGING SYSTEM THAT CHARGES AND/OR CONDITIONS ONE OR MORE BATTERIES, now U.S. Patent Application Publication No. 2016/0249910;

[0260] U.S. patent application Ser. No. 14/633,566, entitled CHARGING SYSTEM THAT ENABLES EMERGENCY RESOLUTIONS FOR CHARGING A BATTERY, now U.S. Patent Application Publication No. 2016/0249918;

[0261] U.S. patent application Ser. No. 14/633,555, entitled SYSTEM FOR MONITORING WHETHER A SURGICAL INSTRUMENT NEEDS TO BE SERVICED, now U.S. Patent Application Publication No. 2016/0249916;

[0262] U.S. patent application Ser. No. 14/633,542, entitled REINFORCED BATTERY FOR A SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2016/0249908;

[0263] U.S. patent application Ser. No. 14/633,548, entitled POWER ADAPTER FOR A SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2016/0249909;

[0264] U.S. patent application Ser. No. 14/633,526, entitled ADAPTABLE SURGICAL INSTRUMENT HANDLE, now U.S. Patent Application Publication No. 2016/0249945;

[0265] U.S. patent application Ser. No. 14/633,541, entitled MODULAR STAPLING ASSEMBLY, now U.S. Patent Application Publication No. 2016/0249927; and

[0266] U.S. patent application Ser. No. 14/633,562, entitled SURGICAL APPARATUS CONFIGURED TO TRACK AN END-OF-LIFE PARAMETER, now U.S. Patent Application Publication No. 2016/0249917.

[0267] Applicant of the present application owns the following patent applications that were filed on Dec. 18, 2014 and which are each herein incorporated by reference in their respective entirety:

[0268] U.S. patent application Ser. No. 14/574,478, entitled SURGICAL INSTRUMENT SYSTEMS COMPRISING AN ARTICULATABLE END EFFECTOR AND MEANS FOR ADJUSTING THE FIRING STROKE OF A FIRING MEMBER, now U.S. Patent Application Publication No. 2016/0174977;

[0269] U.S. patent application Ser. No. 14/574,483, entitled SURGICAL INSTRUMENT ASSEMBLY COMPRISING LOCKABLE SYSTEMS, now U.S. Patent Application Publication No. 2016/0174969;

[0270] U.S. patent application Ser. No. 14/575,139, entitled DRIVE ARRANGEMENTS FOR ARTICULATABLE SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2016/0174978;

[0271] U.S. patent application Ser. No. 14/575,148, entitled LOCKING ARRANGEMENTS FOR DETACHABLE SHAFT ASSEMBLIES WITH ARTICULATABLE SURGICAL END EFFECTORS, now U.S. Patent Application Publication No. 2016/0174976;

[0272] U.S. patent application Ser. No. 14/575,130, entitled SURGICAL INSTRUMENT WITH AN ANVIL THAT IS SELECTIVELY MOVABLE ABOUT A DISCRETE NON-MOVABLE AXIS RELATIVE TO A STAPLE CARTRIDGE, now U.S. Patent Application Publication No. 2016/0174972;

[0273] U.S. patent application Ser. No. 14/575,143, entitled SURGICAL INSTRUMENTS WITH IMPROVED CLOSURE ARRANGEMENTS, now U.S. Patent Application Publication No. 2016/0174983;

[0274] U.S. patent application Ser. No. 14/575,117, entitled SURGICAL INSTRUMENTS WITH ARTICULATABLE END EFFECTORS AND MOVABLE FIRING BEAM SUPPORT ARRANGEMENTS, now U.S. Patent Application Publication No. 2016/0174975;

[0275] U.S. patent application Ser. No. 14/575,154, entitled SURGICAL INSTRUMENTS WITH ARTICULATABLE END EFFECTORS AND IMPROVED FIRING BEAM SUPPORT ARRANGEMENTS, now U.S. Patent Application Publication No. 2016/0174973;

[0276] U.S. patent application Ser. No. 14/574,493, entitled SURGICAL INSTRUMENT ASSEMBLY COMPRISING A FLEXIBLE ARTICULATION SYSTEM, now U.S. Patent Application Publication No. 2016/0174970; and

[0277] U.S. patent application Ser. No. 14/574,500, entitled SURGICAL INSTRUMENT ASSEMBLY COMPRISING A LOCKABLE ARTICULATION SYSTEM, now U.S. Patent Application Publication No. 2016/0174971.

[0278] Applicant of the present application owns the following patent applications that were filed on Mar. 1, 2013 and which are each herein incorporated by reference in their respective entirety:

[0279] U.S. patent application Ser. No. 13/782,295, entitled ARTICULATABLE SURGICAL INSTRUMENTS WITH CONDUCTIVE PATHWAYS FOR SIGNAL COMMUNICATION, now U.S. Patent Application Publication No. 2014/0246471;

[0280] U.S. patent application Ser. No. 13/782,323, entitled ROTARY POWERED ARTICULATION JOINTS FOR SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2014/0246472;

[0281] U.S. patent application Ser. No. 13/782,338, entitled THUMBWHEEL SWITCH ARRANGEMENTS FOR SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2014/0249557;

[0282] U.S. patent application Ser. No. 13/782,499, entitled ELECTROMECHANICAL SURGICAL DEVICE WITH SIGNAL RELAY ARRANGEMENT, now U.S. Pat. No. 9,358,003;

[0283] U.S. patent application Ser. No. 13/782,460, entitled MULTIPLE PROCESSOR MOTOR CONTROL FOR MODULAR SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2014/0246478;

[0284] U.S. patent application Ser. No. 13/782,358, entitled JOYSTICK SWITCH ASSEMBLIES FOR SURGICAL INSTRUMENTS, now U.S. Pat. No. 9,326,767;

[0285] U.S. patent application Ser. No. 13/782,481, entitled SENSOR STRAIGHTENED END EFFECTOR DURING REMOVAL THROUGH TROCAR, now U.S. Pat. No. 9,468,438;

[0286] U.S. patent application Ser. No. 13/782,518, entitled CONTROL METHODS FOR SURGICAL INSTRUMENTS WITH REMOVABLE IMPLEMENT PORTIONS, now U.S. Patent Application Publication No. 2014/0246475;

[0287] U.S. patent application Ser. No. 13/782,375, entitled ROTARY POWERED SURGICAL INSTRUMENTS WITH MULTIPLE DEGREES OF FREEDOM, now U.S. Pat. No. 9,398,911; and

[0288] U.S. patent application Ser. No. 13/782,536, entitled SURGICAL INSTRUMENT SOFT STOP, now U.S. Pat. No. 9,307,986.

[0289] Applicant of the present application also owns the following patent applications that were filed on Mar. 14, 2013 and which are each herein incorporated by reference in their respective entirety:

[0290] U.S. patent application Ser. No. 13/803,097, entitled ARTICULATABLE SURGICAL INSTRUMENT COMPRISING A FIRING DRIVE, now U.S. Patent Application Publication No. 2014/0263542;

[0291] U.S. patent application Ser. No. 13/803,193, entitled CONTROL ARRANGEMENTS FOR A DRIVE MEMBER OF A SURGICAL INSTRUMENT, now U.S. Pat. No. 9,332,987;

[0292] U.S. patent application Ser. No. 13/803,053, entitled INTERCHANGEABLE SHAFT ASSEMBLIES FOR USE WITH A SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2014/0263564;

[0293] U.S. patent application Ser. No. 13/803,086, entitled ARTICULATABLE SURGICAL INSTRUMENT COMPRISING AN ARTICULATION LOCK, now U.S. Patent Application Publication No. 2014/0263541;

[0294] U.S. patent application Ser. No. 13/803,210, entitled SENSOR ARRANGEMENTS FOR ABSOLUTE POSITIONING SYSTEM FOR SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2014/0263538;

[0295] U.S. patent application Ser. No. 13/803,148, entitled MULTI-FUNCTION MOTOR FOR A SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2014/0263554;

[0296] U.S. patent application Ser. No. 13/803,066, entitled DRIVE SYSTEM LOCKOUT ARRANGEMENTS FOR MODULAR SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2014/0263565;

[0297] U.S. patent application Ser. No. 13/803,117, entitled ARTICULATION CONTROL SYSTEM FOR ARTICULATABLE SURGICAL INSTRUMENTS, now U.S. Pat. No. 9,351,726;

[0298] U.S. patent application Ser. No. 13/803,130, entitled DRIVE TRAIN CONTROL ARRANGEMENTS FOR MODULAR SURGICAL INSTRUMENTS, now U.S. Pat. No. 9,351,727; and

[0299] U.S. patent application Ser. No. 13/803,159, entitled METHOD AND SYSTEM FOR OPERATING A SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2014/0277017.

[0300] Applicant of the present application also owns the following patent application that was filed on Mar. 7, 2014 and is herein incorporated by reference in its entirety:

[0301] U.S. patent application Ser. No. 14/200,111, entitled CONTROL SYSTEMS FOR SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2014/0263539.

[0302] Applicant of the present application also owns the following patent applications that were filed on Mar. 26, 2014 and are each herein incorporated by reference in their respective entirety:

[0303] U.S. patent application Ser. No. 14/226,106, entitled POWER MANAGEMENT CONTROL SYSTEMS FOR SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2015/0272582;

[0304] U.S. patent application Ser. No. 14/226,099, entitled STERILIZATION VERIFICATION CIRCUIT, now U.S. Patent Application Publication No. 2015/0272581;

[0305] U.S. patent application Ser. No. 14/226,094, entitled VERIFICATION OF NUMBER OF BATTERY EXCHANGES/PROCEDURE COUNT, now U.S. Patent Application Publication No. 2015/0272580;

[0306] U.S. patent application Ser. No. 14/226,117, entitled POWER MANAGEMENT THROUGH SLEEP OPTIONS OF SEGMENTED CIRCUIT AND WAKE UP CONTROL, now U.S. Patent Application Publication No. 2015/0272574;

[0307] U.S. patent application Ser. No. 14/226,075, entitled MODULAR POWERED SURGICAL INSTRUMENT WITH DETACHABLE SHAFT ASSEMBLIES, now U.S. Patent Application Publication No. 2015/0272579;

[0308] U.S. patent application Ser. No. 14/226,093, entitled FEEDBACK ALGORITHMS FOR MANUAL BAILOUT SYSTEMS FOR SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2015/0272569;

[0309] U.S. patent application Ser. No. 14/226,116, entitled SURGICAL INSTRUMENT UTILIZING SENSOR ADAPTATION, now U.S. Patent Application Publication No. 2015/0272571;

[0310] U.S. patent application Ser. No. 14/226,071, entitled SURGICAL INSTRUMENT CONTROL CIRCUIT HAVING A SAFETY PROCESSOR, now U.S. Patent Application Publication No. 2015/0272578;

[0311] U.S. patent application Ser. No. 14/226,097, entitled SURGICAL INSTRUMENT COMPRISING INTERACTIVE SYSTEMS, now U.S. Patent Application Publication No. 2015/0272570;

[0312] U.S. patent application Ser. No. 14/226,126, entitled INTERFACE SYSTEMS FOR USE WITH SURGICAL INSTRUMENTS, now U.S. Patent Application Publication No. 2015/0272572;

[0313] U.S. patent application Ser. No. 14/226,133, entitled MODULAR SURGICAL INSTRUMENT SYSTEM, now U.S. Patent Application Publication No. 2015/0272557;

[0314] U.S. patent application Ser. No. 14/226,081, entitled SYSTEMS AND METHODS FOR CONTROLLING A SEGMENTED CIRCUIT, now U.S. Patent Application Publication No. 2015/0277471;

[0315] U.S. patent application Ser. No. 14/226,076, entitled POWER MANAGEMENT THROUGH SEGMENTED CIRCUIT AND VARIABLE VOLTAGE PROTECTION, now U.S. Patent Application Publication No. 2015/0280424;

[0316] U.S. patent application Ser. No. 14/226,111, entitled SURGICAL STAPLING INSTRUMENT SYSTEM, now U.S. Patent Application Publication No. 2015/0272583; and

[0317] U.S. patent application Ser. No. 14/226,125, entitled SURGICAL INSTRUMENT COMPRISING A ROTATABLE SHAFT, now U.S. Patent Application Publication No. 2015/0280384.

[0318] Applicant of the present application also owns the following patent applications that were filed on Sep. 5, 2014 and which are each herein incorporated by reference in their respective entirety:

[0319] U.S. patent application Ser. No. 14/479,103, entitled CIRCUITRY AND SENSORS FOR POWERED MEDICAL DEVICE, now U.S. Patent Application Publication No. 2016/0066912;

[0320] U.S. patent application Ser. No. 14/479,119, entitled ADJUNCT WITH INTEGRATED SENSORS TO QUANTIFY TISSUE COMPRESSION, now U.S. Patent Application Publication No. 2016/0066914;

[0321] U.S. patent application Ser. No. 14/478,908, entitled MONITORING DEVICE DEGRADATION BASED ON COMPONENT EVALUATION, now U.S. Patent Application Publication No. 2016/0066910;

[0322] U.S. patent application Ser. No. 14/478,895, entitled MULTIPLE SENSORS WITH ONE SENSOR AFFECTING A SECOND SENSOR′S OUTPUT OR INTERPRETATION, now U.S. Patent Application Publication No. 2016/0066909;

[0323] U.S. patent application Ser. No. 14/479,110, entitled POLARITY OF HALL MAGNET TO DETECT MISLOADED CARTRIDGE, now U.S. Patent Application Publication No. 2016/0066915;

[0324] U.S. patent application Ser. No. 14/479,098, entitled SMART CARTRIDGE WAKE UP OPERATION AND DATA RETENTION, now U.S. Patent Application Publication No. 2016/0066911;

[0325] U.S. patent application Ser. No. 14/479,115, entitled MULTIPLE MOTOR CONTROL FOR POWERED MEDICAL DEVICE, now U.S. Patent Application Publication No. 2016/0066916; and

[0326] U.S. patent application Ser. No. 14/479,108, entitled LOCAL DISPLAY OF TISSUE PARAMETER STABILIZATION, now U.S. Patent Application Publication No. 2016/0066913.

[0327] Applicant of the present application also owns the following patent applications that were filed on Apr. 9, 2014 and which are each herein incorporated by reference in their respective entirety:

[0328] U.S. patent application Ser. No. 14/248,590, entitled MOTOR DRIVEN SURGICAL INSTRUMENTS WITH LOCKABLE DUAL DRIVE SHAFTS, now U.S. Patent Application Publication No. 2014/0305987;

[0329] U.S. patent application Ser. No. 14/248,581, entitled SURGICAL INSTRUMENT COMPRISING A CLOSING DRIVE AND A FIRING DRIVE OPERATED FROM THE SAME ROTATABLE OUTPUT, now U.S. Patent Application Publication No. 2014/0305989;

[0330] U.S. patent application Ser. No. 14/248,595, entitled SURGICAL INSTRUMENT SHAFT INCLUDING SWITCHES FOR CONTROLLING THE OPERATION OF THE SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2014/0305988;

[0331] U.S. patent application Ser. No. 14/248,588, entitled POWERED LINEAR SURGICAL STAPLER, now U.S. Patent Application Publication No. 2014/0309666;

[0332] U.S. patent application Ser. No. 14/248,591, entitled TRANSMISSION ARRANGEMENT FOR A SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2014/0305991;

[0333] U.S. patent application Ser. No. 14/248,584, entitled MODULAR MOTOR DRIVEN SURGICAL INSTRUMENTS WITH ALIGNMENT FEATURES FOR ALIGNING ROTARY DRIVE SHAFTS WITH SURGICAL END EFFECTOR SHAFTS, now U.S. Patent Application Publication No. 2014/0305994;

[0334] U.S. patent application Ser. No. 14/248,587, entitled POWERED SURGICAL STAPLER, now U.S. Patent Application Publication No. 2014/0309665;

[0335] U.S. patent application Ser. No. 14/248,586, entitled DRIVE SYSTEM DECOUPLING ARRANGEMENT FOR A SURGICAL INSTRUMENT, now U.S. Patent Application Publication No. 2014/0305990; and

[0336] U.S. patent application Ser. No. 14/248,607, entitled MODULAR MOTOR DRIVEN SURGICAL INSTRUMENTS WITH STATUS INDICATION ARRANGEMENTS, now U.S. Patent Application Publication No. 2014/0305992.

[0337] Applicant of the present application also owns the following patent applications that were filed on Apr. 16, 2013 and which are each herein incorporated by reference in their respective entirety:

[0338] U.S. Provisional Patent Application Ser. No. 61/812,365, entitled SURGICAL INSTRUMENT WITH MULTIPLE FUNCTIONS PERFORMED BY A SINGLE MOTOR;

[0339] U.S. Provisional Patent Application Ser. No. 61/812,376, entitled LINEAR CUTTER WITH POWER;

[0340] U.S. Provisional Patent Application Ser. No. 61/812,382, entitled LINEAR CUTTER WITH MOTOR AND PISTOL GRIP;

[0341] U.S. Provisional Patent Application Ser. No. 61/812,385, entitled SURGICAL INSTRUMENT HANDLE WITH MULTIPLE ACTUATION MOTORS AND MOTOR CONTROL; and

[0342] U.S. Provisional Patent Application Ser. No. 61/812,372, entitled SURGICAL INSTRUMENT WITH MULTIPLE FUNCTIONS PERFORMED BY A SINGLE MOTOR.

[0343] Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. Well-known operations, components, and elements have not been described in detail so as not to obscure the embodiments described in the specification. The reader will understand that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and illustrative. Variations and changes thereto may be made without departing from the scope of the claims.

[0344] The terms “comprise” (and any form of comprise, such as “comprises” and “comprising”), “have” (and any form of have, such as “has” and “having”), “include” (and any form of include, such as “includes” and “including”) and “contain” (and any form of contain, such as “contains” and “containing”) are open-ended linking verbs. As a result, a surgical system, device, or apparatus that “comprises,” “has,” “includes” or “contains” one or more elements possesses those one or more elements, but is not limited to possessing only those one or more elements. Likewise, an element of a system, device, or apparatus that “comprises,” “has,” “includes” or “contains” one or more features possesses those one or more features, but is not limited to possessing only those one or more features.

[0345] The terms “proximal” and “distal” are used herein with reference to a clinician manipulating the handle portion of the surgical instrument. The term “proximal” refers to the portion closest to the clinician and the term “distal” refers to the portion located away from the clinician. It will be further appreciated that, for convenience and clarity, spatial terms such as “vertical”, “horizontal”, “up”, and “down” may be used herein with respect to the drawings. However, surgical instruments are used in many orientations and positions, and these terms are not intended to be limiting and/or absolute.

[0346] Various exemplary devices and methods are provided for performing laparoscopic and minimally invasive surgical procedures. However, the reader will readily appreciate that the various methods and devices disclosed herein can be used in numerous surgical procedures and applications including, for example, in connection with open surgical procedures. As the present Detailed Description proceeds, the reader will further appreciate that the various instruments disclosed herein can be inserted into a body in any way, such as through a natural orifice, through an incision or puncture hole formed in tissue, etc. The working portions or end effector portions of the instruments can be inserted directly into a patient's body or can be inserted through an access device that has a working channel through which the end effector and elongate shaft of a surgical instrument can be advanced.

[0347] A surgical stapling system can comprise a shaft and an end effector extending from the shaft. The end effector comprises a first jaw and a second jaw. The first jaw comprises a staple cartridge. The staple cartridge is insertable into and removable from the first jaw; however, other embodiments are envisioned in which a staple cartridge is not removable from, or at least readily replaceable from, the first jaw. The second jaw comprises an anvil configured to deform staples ejected from the staple cartridge. The second jaw is pivotable relative to the first jaw about a closure axis; however, other embodiments are envisioned in which the first jaw is pivotable relative to the second jaw. The surgical stapling system further comprises an articulation joint configured to permit the end effector to be rotated, or articulated, relative to the shaft. The end effector is rotatable about an articulation axis extending through the articulation joint. Other embodiments are envisioned which do not include an articulation joint.

[0348] The staple cartridge comprises a cartridge body. The cartridge body includes a proximal end, a distal end, and a deck extending between the proximal end and the distal end. In use, the staple cartridge is positioned on a first side of the tissue to be stapled and the anvil is positioned on a second side of the tissue. The anvil is moved toward the staple cartridge to compress and clamp the tissue against the deck. Thereafter, staples removably stored in the cartridge body can be deployed into the tissue. The cartridge body includes staple cavities defined therein wherein staples are removably stored in the staple cavities. The staple cavities are arranged in six longitudinal rows. Three rows of staple cavities are positioned on a first side of a longitudinal slot and three rows of staple cavities are positioned on a second side of the longitudinal slot. Other arrangements of staple cavities and staples may be possible.

[0349] The staples are supported by staple drivers in the cartridge body. The drivers are movable between a first, or unfired position, and a second, or fired, position to eject the staples from the staple cavities. The drivers are retained in the cartridge body by a retainer which extends around the bottom of the cartridge body and includes resilient members configured to grip the cartridge body and hold the retainer to the cartridge body. The drivers are movable between their unfired positions and their fired positions by a sled. The sled is movable between a proximal position adjacent the proximal end and a distal position adjacent the distal end. The sled comprises a plurality of ramped surfaces configured to slide under the drivers and lift the drivers, and the staples supported thereon, toward the anvil.

[0350] Further to the above, the sled is moved distally by a firing member. The firing member is configured to contact the sled and push the sled toward the distal end. The longitudinal slot defined in the cartridge body is configured to receive the firing member. The anvil also includes a slot configured to receive the firing member. The firing member further comprises a first cam which engages the first jaw and a second cam which engages the second jaw. As the firing member is advanced distally, the first cam and the second cam can control the distance, or tissue gap, between the deck of the staple cartridge and the anvil. The firing member also comprises a knife configured to incise the tissue captured intermediate the staple cartridge and the anvil. It is desirable for the knife to be positioned at least partially proximal to the ramped surfaces such that the staples are ejected ahead of the knife.

[0351] FIG. 1 depicts a motor-driven surgical system 10 that may be used to perform a variety of different surgical procedures. As can be seen in that Figure, one example of the surgical system 10 includes four interchangeable surgical tool assemblies 100, 200, 300 and 1000 that are each adapted for interchangeable use with a handle assembly 500. Each interchangeable surgical tool assembly 100, 200, 300 and 1000 may be designed for use in connection with the performance of one or more specific surgical procedures. In another surgical system embodiment, the interchangeable surgical tool assemblies may be effectively employed with a tool drive assembly of a robotically controlled or automated surgical system. For example, the surgical tool assemblies disclosed herein may be employed with various robotic systems, instruments, components and methods such as, but not limited to, those disclosed in U.S. Pat. No. 9,072,535, entitled SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS, which is hereby incorporated by reference herein in its entirety.

[0352] FIG. 2 illustrates one form of an interchangeable surgical tool assembly 100 that is operably coupled to the handle assembly 500. FIG. 3 illustrates attachment of the interchangeable surgical tool assembly 100 to the handle assembly 500. The attachment arrangement and process depicted in FIG. 3 may also be employed in connection with attachment of any of the interchangeable surgical tool assemblies 100, 200, 300 and 1000 to a tool drive portion or tool drive housing of a robotic system. The handle assembly 500 may comprise a handle housing 502 that includes a pistol grip portion 504 that can be gripped and manipulated by the clinician. As will be briefly discussed below, the handle assembly 500 operably supports a plurality of drive systems that are configured to generate and apply various control motions to corresponding portions of the interchangeable surgical tool assembly 100, 200, 300 and/or 1000 that is operably attached thereto.

[0353] Referring now to FIG. 3, the handle assembly 500 may further include a frame 506 that operably supports the plurality of drive systems. For example, the frame 506 can operably support a “first” or closure drive system, generally designated as 510, which may be employed to apply closing and opening motions to the interchangeable surgical tool assembly 100, 200, 300 and 1000 that is operably attached or coupled to the handle assembly 500. In at least one form, the closure drive system 510 may include an actuator in the form of a closure trigger 512 that is pivotally supported by the frame 506. Such arrangement enables the closure trigger 512 to be manipulated by a clinician such that when the clinician grips the pistol grip portion 504 of the handle assembly 500, the closure trigger 512 may be easily pivoted from a starting or “unactuated” position to an “actuated” position and more particularly to a fully compressed or fully actuated position. In various forms, the closure drive system 510 further includes a closure linkage assembly 514 that is pivotally coupled to the closure trigger 512 or otherwise operably interfaces therewith. As will be discussed in further detail below, in the illustrated example, the closure linkage assembly 514 includes a transverse attachment pin 516 that facilitates attachment to a corresponding drive system on the surgical tool assembly. In use, to actuate the closure drive system, the clinician depresses the closure trigger 512 towards the pistol grip portion 504. As described in further detail in U.S. patent application Ser. No. 14/226,142, entitled SURGICAL INSTRUMENT COMPRISING A SENSOR SYSTEM, now U.S. Patent Application Publication No. 2015/0272575, which is hereby incorporated by reference in its entirety herein, when the clinician fully depresses the closure trigger 512 to attain the full closure stroke, the closure drive system is configured to lock the closure trigger 512 into the fully depressed or fully actuated position. When the clinician desires to unlock the closure trigger 512 to permit it to be biased to the unactuated position, the clinician simply activates a closure release button assembly 518 which enables the closure trigger to return to unactuated position. The closure release button 518 may also be configured to interact with various sensors that communicate with a microcontroller 520 in the handle assembly 500 for tracking the position of the closure trigger 512. Further details concerning the configuration and operation of the closure release button assembly 518 may be found in U.S. Patent Application Publication No. 2015/0272575.

[0354] In at least one form, the handle assembly 500 and the frame 506 may operably support another drive system referred to herein as a firing drive system 530 that is configured to apply firing motions to corresponding portions of the interchangeable surgical tool assembly that is attached thereto. As was described in detail in U.S. Patent Application Publication No. 2015/0272575, the firing drive system 530 may employ an electric motor (not shown in FIGS. 1-3) that is located in the pistol grip portion 504 of the handle assembly 500. In various forms, the motor may be a DC brushed driving motor having a maximum rotation of, approximately, 25,000 RPM, for example. In other arrangements, the motor may include a brushless motor, a cordless motor, a synchronous motor, a stepper motor, or any other suitable electric motor. The motor may be powered by a power source 522 that in one form may comprise a removable power pack. The power pack may support a plurality of Lithium Ion (“LI”) or other suitable batteries therein. A number of batteries may be connected in series may be used as the power source 522 for the surgical system 10. In addition, the power source 522 may be replaceable and/or rechargeable.

[0355] The electric motor is configured to axially drive a longitudinally movable drive member 540 in a distal and proximal directions depending upon the polarity of the motor. For example, when the motor is driven in one rotary direction, the longitudinally movable drive member 540 the will be axially driven in the distal direction “DD”. When the motor is driven in the opposite rotary direction, the longitudinally movable drive member 540 will be axially driven in a proximal direction “PD”. The handle assembly 500 can include a switch 513 which can be configured to reverse the polarity applied to the electric motor by the power source 522 or otherwise control the motor. The handle assembly 500 can also include a sensor or sensors (not shown) that is configured to detect the position of the drive member 540 and/or the direction in which the drive member 540 is being moved. Actuation of the motor can be controlled by a firing trigger 532 (FIG. 1) that is pivotally supported on the handle assembly 500. The firing trigger 532 may be pivoted between an unactuated position and an actuated position. The firing trigger 532 may be biased into the unactuated position by a spring or other biasing arrangement such that when the clinician releases the firing trigger 532, it may be pivoted or otherwise returned to the unactuated position by the spring or biasing arrangement. In at least one form, the firing trigger 532 can be positioned “outboard” of the closure trigger 512 as was discussed above. As discussed in U.S. Patent Application Publication No. 2015/0272575, the handle assembly 500 may be equipped with a firing trigger safety button (not shown) to prevent inadvertent actuation of the firing trigger 532. When the closure trigger 512 is in the unactuated position, the safety button is contained in the handle assembly 500 where the clinician cannot readily access it and move it between a safety position preventing actuation of the firing trigger 532 and a firing position wherein the firing trigger 532 may be fired. As the clinician depresses the closure trigger 512, the safety button and the firing trigger 532 pivot down wherein they can then be manipulated by the clinician.

[0356] In at least one form, the longitudinally movable drive member 540 may have a rack of teeth (not shown) formed thereon for meshing engagement with a corresponding drive gear arrangement (not shown) that interfaces with the motor. Further details regarding those features may be found in U.S. Patent Application Publication No. 2015/0272575. At least one form also includes a manually-actuatable “bailout” assembly that is configured to enable the clinician to manually retract the longitudinally movable drive member 540 should the motor become disabled. The bailout assembly may include a lever or bailout handle assembly that is stored within the handle assembly 500 under a releasable door 550. The lever is configured to be manually pivoted into ratcheting engagement with the teeth in the drive member 540. Thus, the clinician can manually retract the drive member 540 by using the bailout handle assembly to ratchet the drive member 5400 in the proximal direction “PD”. U.S. patent application Ser. No. 12/249,117, entitled POWERED SURGICAL CUTTING AND STAPLING APPARATUS WITH MANUALLY RETRACTABLE FIRING SYSTEM, now U.S. Pat. No. 8,608,045, the entire disclosure of which is hereby incorporated by reference herein discloses bailout arrangements and other components, arrangements and systems that may also be employed with the various surgical tool assemblies disclosed herein.

[0357] Turning now to FIG. 2, the interchangeable surgical tool assembly 100 includes a surgical end effector 110 that comprises a first jaw and a second jaw. In one arrangement, the first jaw comprises an elongate channel 112 that is configured to operably support a surgical staple cartridge 116 therein. The second jaw comprises an anvil 114 that is pivotally supported relative to the elongate channel 112. The interchangeable surgical tool assembly 100 also includes a lockable articulation joint 120 which can be configured to releasably hold the end effector 110 in a desired position relative to a shaft axis SA. Details regarding various constructions and operation of the end effector 110, the articulation joint 120 and the articulation lock are set forth in U.S. patent application Ser. No. 13/803,086, entitled ARTICULATABLE SURGICAL INSTRUMENT COMPRISING AN ARTICULATION LOCK, now U.S. Patent Application Publication No. 2014/0263541, which is hereby incorporated by reference herein in its entirety. As can be further seen in FIGS. 2 and 3, the interchangeable surgical tool assembly 100 can include a proximal housing or nozzle 130 and a closure tube assembly 140 which can be utilized to close and/or open the anvil 114 of the end effector 110. As discussed in U.S. Patent Application Publication No. 2015/0272575, the closure tube assembly 140 is movably supported on a spine 145 which supports articulation driver arrangement 147 for applying articulation motions to the surgical end effector 110. The spine 145 is configured to, one, slidably support a firing bar 170 therein and, two, slidably support the closure tube assembly 140 which extends around the spine 145. In various circumstances, the spine 145 includes a proximal end that is rotatably supported in a chassis 150. See FIG. 3. In one arrangement, for example, the proximal end of the spine 145 is attached to a spine bearing (not shown) that is configured to be supported within the chassis 150. Such an arrangement facilitates rotatable attachment of the spine 145 to the chassis 150 such that the spine 145 may be selectively rotated about a shaft axis SA relative to the chassis 150.

[0358] Still referring to FIG. 3, the interchangeable surgical tool assembly 100 includes a closure shuttle 160 that is slidably supported within the chassis 150 such that it may be axially moved relative thereto. As can be seen in FIG. 3, the closure shuttle 160 includes a pair of proximally-protruding hooks 162 that are configured for attachment to the attachment pin 516 that is attached to the closure linkage assembly 514 in the handle assembly 500. A proximal closure tube segment 146 of the closure tube assembly 140 is coupled to the closure shuttle 160 for relative rotation thereto. Thus, when the hooks 162 are hooked over the pin 516, actuation of the closure trigger 512 will result in the axial movement of the closure shuttle 160 and ultimately, the closure tube assembly 140 on the spine 145. A closure spring (not shown) may also be journaled on the closure tube assembly 140 and serves to bias the closure tube assembly 140 in the proximal direction “PD” which can serve to pivot the closure trigger 512 into the unactuated position when the shaft assembly 100 is operably coupled to the handle assembly 500. In use, the closure tube assembly 140 is translated distally (direction DD) to close the anvil 114, for example, in response to the actuation of the closure trigger 512. The closure tube assembly 140 includes a distal closure tube segment 142 that is pivotally pinned to a distal end of a proximal closure tube segment 146. The distal closure tube segment 142 is configured to axially move with the proximal closure tube segment 146 relative to the surgical end effector 110. When the distal end of the distal closure tube segment 142 strikes a proximal surface or ledge 115 on the anvil 114, the anvil 114 is pivoted closed. Further details concerning the closure of anvil 114 may be found in the aforementioned U.S. Patent Application Publication No. 2014/0263541 and will be discussed in further detail below. As was also described in detail in U.S. Patent Application Publication No. 2014/0263541, the anvil 114 is opened by proximally translating the distal closure tube segment 142. The distal closure tube segment 142 has a horseshoe aperture 143 therein that defines a downwardly extending return tab (not shown) that cooperates with an anvil tab 117 formed on the proximal end of the anvil 114 to pivot the anvil 114 back to an open position. In the fully open position, the closure tube assembly 140 is in its proximal-most or unactuated position.

[0359] As was also indicated above, the interchangeable surgical tool assembly 100 further includes a firing bar 170 that is supported for axial travel within the shaft spine 145. The firing bar 170 includes an intermediate firing shaft portion that is configured for attachment to a distal cutting portion or knife bar that is configured for axial travel through the surgical end effector 110. In at least one arrangement, the interchangeable surgical tool assembly 100 includes a clutch assembly (not shown) which can be configured to selectively and releasably couple the articulation driver to the firing bar 170. Further details regarding the clutch assembly features and operation may be found in U.S. Patent Application Publication No. 2014/0263541. As discussed in U.S. Patent Application Publication No. 2014/0263541, when the clutch assembly is in its engaged position, distal movement of the firing bar 170 can move the articulation driver arrangement 147 distally and, correspondingly, proximal movement of the firing bar 170 can move the articulation driver arrangement 147 proximally. When the clutch assembly is in its disengaged position, movement of the firing bar 170 is not transmitted to the articulation driver arrangement 147 and, as a result, the firing bar 170 can move independently of the articulation driver arrangement 147. The interchangeable surgical tool assembly 100 may also include a slip ring assembly (not shown) which can be configured to conduct electrical power to and/or from the end effector 110 and/or communicate signals to and/or from the end effector 110. Further details regarding the slip ring assembly may be found in U.S. Patent Application Publication No. 2014/0263541. U.S. patent application Ser. No. 13/800,067, entitled STAPLE CARTRIDGE TISSUE THICKNESS SENSOR SYSTEM, now U.S. Patent Application Publication No. 2014/0263552 is incorporated by reference in its entirety. U.S. Pat. No. 9,345,481, entitled STAPLE CARTRIDGE TISSUE THICKNESS SENSOR SYSTEM, is also hereby incorporated by reference in its entirety.

[0360] Still referring to FIG. 3, the chassis 150 has at least one, and preferably two, tapered attachment portions 152 formed thereon that are adapted to be received within corresponding dovetail slots 507 formed within a distal end of the frame 506. Each dovetail slot 507 may be tapered or, stated another way, be somewhat V-shaped to seatingly receive the tapered attachment portions 152 therein. As can be further seen in FIG. 3, a shaft attachment lug 172 is formed on the proximal end of the firing shaft 170. When the interchangeable surgical tool assembly 100 is coupled to the handle assembly 500, the shaft attachment lug 172 is received in a firing shaft attachment cradle 542 formed in the distal end of the longitudinally movable drive member 540. The interchangeable surgical tool assembly 100 also employs a latch system 180 for releasably latching the shaft assembly 100 to the frame 506 of the handle assembly 500. In at least one form, for example, the latch system 180 includes a lock member or lock yoke 182 that is movably coupled to the chassis 150. The lock yoke 182 includes two proximally protruding lock lugs 184 that are configured for releasable engagement with corresponding lock detents or grooves 509 in the distal attachment flange of the frame 506. In various forms, the lock yoke 182 is biased in the proximal direction by spring or biasing member. Actuation of the lock yoke 182 may be accomplished by a latch button 186 that is slidably mounted on a latch actuator assembly that is mounted to the chassis 150. The latch button 186 may be biased in a proximal direction relative to the lock yoke 182. As will be discussed in further detail below, the lock yoke 182 may be moved to an unlocked position by biasing the latch button 186 the in distal direction DD which also causes the lock yoke 182 to pivot out of retaining engagement with the distal attachment flange of the frame 506. When the lock yoke 182 is in “retaining engagement” with the distal attachment flange of the frame 506, the lock lugs 184 are retainingly seated within the corresponding lock detents or grooves 509 in the distal end of the frame 506. Further details concerning the latching system may be found in U.S. Patent Application Publication No. 2014/0263541.

[0361] Attachment of the interchangeable surgical tool assembly 100 to the handle assembly 500 will now be described with reference to FIG. 3. To commence the coupling process, the clinician may position the chassis 150 of the interchangeable surgical tool assembly 100 above or adjacent to the distal end of the frame 506 such that the tapered attachment portions 152 formed on the chassis 150 are aligned with the dovetail slots 507 in the frame 506. The clinician may then move the surgical tool assembly 100 along an installation axis IA that is perpendicular to the shaft axis SA to seat the tapered attachment portions 152 in “operable engagement” with the corresponding dovetail receiving slots 507 in the distal end of the frame 506. In doing so, the shaft attachment lug 172 on the firing shaft 170 will also be seated in the cradle 542 in the longitudinally movable drive member 540 and the portions of pin 516 on the closure link 514 will be seated in the corresponding hooks 162 in the closure shuttle 160. As used herein, the term “operable engagement” in the context of two components means that the two components are sufficiently engaged with each other so that upon application of an actuation motion thereto, the components may carry out their intended action, function and/or procedure.

[0362] Returning now to FIG. 1, the surgical system 10 illustrated in that Figure includes four interchangeable surgical tool assemblies 100, 200, 300 and 1000 that may each be effectively employed with the same handle assembly 500 to perform different surgical procedures. The construction of an exemplary form of interchangeable surgical tool assembly 100 was briefly discussed above and is discussed in further detail in U.S. Patent Application Publication No. 2014/0263541. Various details regarding interchangeable surgical tool assemblies 200 and 300 may be found in the various U.S. Patent Applications that were filed on even date herewith and which have been incorporated by reference herein. Various details regarding interchangeable surgical tool assembly 1000 will be discussed in further detail below.

[0363] As illustrated in FIG. 1, each of the surgical tool assemblies 100, 200, 300 and 1000 includes a pair of jaws wherein at least one of the jaws is movable between open positions wherein tissue may be captured or manipulated between the two jaws and closed positions wherein the tissue is firmly retained therebetween. The movable jaw or jaws are moved between open and closed positions upon application of closure and opening motions applied thereto from the handle assembly or the robotic or automated surgical system to which the surgical tool assembly is operably coupled. In addition, each of the illustrated interchangeable surgical tool assemblies includes a firing member that is configured to cut tissue and fire staples from a staple cartridge that is supported in one of the jaws in response to firing motions applied thereto by the handle assembly or robotic system. Each surgical tool assembly may be uniquely designed to perform a specific procedure, for example, to cut and fasten a particular type of and thickness of tissue within a certain area in the body. The closing, firing and articulation control systems in the handle assembly 500 or robotic system may be configured to generate axial control motions and/or rotary control motions depending upon the type of closing, firing and articulation system configurations that are employed in the surgical tool assembly. In one arrangement, when a closure control system in the handle assembly or robotic system is fully actuated, one of the closure system control components which may, for example, comprise a closure tube assembly as described above, moves axially from an unactuated position to its fully actuated position. The axial distance that the closure tube assembly moves between its unactuated position to its fully actuated position may be referred to herein as its “closure stroke length”. Similarly, when a firing system in the handle assembly or robotic system is fully actuated, one of the firing system control components which may, for example, comprise the longitudinally movable drive member as described above moves axially from its unactuated position to its fully actuated or fired position. The axial distance that the longitudinally movable drive member moves between its unactuated position and its fully fired position may be referred to herein as its “firing stroke length”. For those surgical tool assemblies that employ articulatable end effector arrangements, the handle assembly or robotic system may employ articulation control components that move axially through an “articulation drive stroke length”. In many circumstances, the closure stroke length, the firing stroke length and the articulation drive stroke length are fixed for a particular handle assembly or robotic system. Thus, each of the surgical tool assemblies must be able to accommodate control movements of the closure, firing and/or articulation components through each of their entire stroke lengths without placing undue stress on the surgical tool components which might lead to damage or catastrophic failure of surgical tool assembly.

[0364] Turning now to FIGS. 4-10, the interchangeable surgical tool assembly 1000 includes a surgical end effector 1100 that comprises an elongate channel 1102 that is configured to operably support a staple cartridge 1110 therein. The end effector 1100 may further include an anvil 1130 that is pivotally supported relative to the elongate channel 1102. The interchangeable surgical tool assembly 1000 may further include an articulation joint 1200 and an articulation lock 1210 (FIGS. 5 and 8-10) which can be configured to releasably hold the end effector 1100 in a desired articulated position relative to a shaft axis SA. Details regarding the construction and operation of the articulation lock 1210 may be found in in U.S. patent application Ser. No. 13/803,086, entitled ARTICULATABLE SURGICAL INSTRUMENT COMPRISING AN ARTICULATION LOCK, now U.S. Patent Application Publication No. 2014/0263541, the entire disclosure of which is hereby incorporated by reference herein. Additional details concerning the articulation lock may also be found in U.S. patent application Ser. No. 15/019,196, filed Feb. 9, 2016, entitled SURGICAL INSTRUMENT ARTICULATION MECHANISM WITH SLOTTED SECONDARY CONSTRAINT, the entire disclosure of which is hereby incorporated by reference herein. As can be seen in FIG. 7, the interchangeable surgical tool assembly 1000 can further include a proximal housing or nozzle 1300 comprised of nozzle portions 1302, 1304 as well as an actuator wheel portion 1306 that is configured to be coupled to the assembled nozzle portions 1302, 1304 by snaps, lugs, screws etc. The interchangeable surgical tool assembly 1000 can further include a closure tube assembly 1400 which can be utilized to close and/or open the anvil 1130 of the end effector 1100 as will be discussed in further detail below. Primarily referring now to FIGS. 8 and 9, the interchangeable surgical tool assembly 1000 can include a spine assembly 1500 which can be configured to support the articulation lock 1210. In the illustrated arrangement, the spine assembly 1500 comprises an “elastic” spine or frame member 1510 which will be described in further detail below. A distal end portion 1522 of the elastic spine member 1510 is attached to a distal frame segment 1560 that operably supports the articulation lock 1210 therein. As can be seen in FIGS. 7 and 8, the spine assembly 1500 is configured to, one, slidably support a firing member assembly 1600 therein and, two, slidably support the closure tube assembly 1400 which extends around the spine assembly 1500. The spine assembly 1500 can also be configured to slidably support a proximal articulation driver 1700.

[0365] As can be seen in FIG. 10, the distal frame segment 1560 is pivotally coupled to the elongate channel 1102 by an end effector mounting assembly 1230. In one arrangement, for example, the distal end 1562 of the distal frame segment 1560 has a pivot pin 1564 formed thereon. The pivot pin 1564 is adapted to be pivotally received within a pivot hole 1234 formed in pivot base portion 1232 of the end effector mounting assembly 1230. The end effector mounting assembly 1230 is attached to the proximal end 1103 of the elongate channel 1102 by a spring pin 1105 or other suitable member. The pivot pin 1564 defines an articulation axis B-B that is transverse to the shaft axis SA. See FIG. 4. Such arrangement facilitates pivotal travel (i.e., articulation) of the end effector 1100 about the articulation axis B-B relative to the spine assembly 1500.

[0366] Still referring to FIG. 10, in the illustrated embodiment, the articulation driver 1700 has a distal end 1702 that is configured to operably engage the articulation lock 1210. The articulation lock 1210 includes an articulation frame 1212 that is adapted to operably engage a drive pin 1238 on the pivot base portion 1232 of the end effector mounting assembly 1230. In addition, a cross-link 1237 may be linked to the drive pin 1238 and articulation frame 1212 to assist articulation of the end effector 1100. As indicated above, further details regarding the operation of the articulation lock 1210 and the articulation frame 1212 may be found in U.S. patent application Ser. No. 13/803,086, now U.S. Patent Application Publication No. 2014/0263541. Further details regarding the end effector mounting assembly and crosslink may be found in U.S. patent application Ser. No. 15/019,245, filed Feb. 9, 2016, entitled SURGICAL INSTRUMENTS WITH CLOSURE STROKE REDUCTION ARRANGEMENTS, the entire disclosure of which is hereby incorporated by reference herein. In various circumstances, the elastic spine member 1510 includes a proximal end 1514 which is rotatably supported in a chassis 1800. In one arrangement, for example, the proximal end 1514 of the elastic spine member 1510 has a thread 1516 formed thereon for threaded attachment to a spine bearing (not shown) that is configured to be supported within the chassis 1800. Such an arrangement facilitates rotatable attachment of the elastic spine member 1510 to the chassis 1800 such that the spine assembly 1500 may be selectively rotated about a shaft axis SA relative to the chassis 1800.

[0367] Referring primarily to FIG. 7, the interchangeable surgical tool assembly 1000 includes a closure shuttle 1420 that is slidably supported within the chassis 1800 such that it may be axially moved relative thereto. In one form, the closure shuttle 1420 includes a pair of proximally-protruding hooks 1421 that are configured for attachment to the attachment pin 516 that is attached to the closure linkage assembly 514 of the handle assembly 500 as was discussed above. A proximal end 1412 of a proximal closure tube segment 1410 is coupled to the closure shuttle 1420 for relative rotation thereto. For example, a U-shaped connector 1424 is inserted into an annular slot 1414 in the proximal end 1412 of the proximal closure tube segment 1410 and is retained within vertical slots 1422 in the closure shuttle 1420. See FIG. 7. Such arrangement serves to attach the proximal closure tube segment 1410 to the closure shuttle 1420 for axial travel therewith while enabling the closure tube assembly 1400 to rotate relative to the closure shuttle 1420 about the shaft axis SA. A closure spring (not shown) is journaled on the proximal end 1412 of the proximal closure tube segment 1410 and serves to bias the closure tube assembly 1400 in the proximal direction PD which can serve to pivot the closure trigger 512 on the handle assembly 500 (FIG. 3) into the unactuated position when the interchangeable surgical tool assembly 1000 is operably coupled to the handle assembly 500.

[0368] As indicated above, the illustrated interchangeable surgical tool assembly 1000 includes an articulation joint 1200. Other interchangeable surgical tool assemblies, however, may not be capable of articulation. As can be seen in FIG. 10, upper and lower tangs 1415, 1416 protrude distally from a distal end of the proximal closure tube segment 1410 to be movably coupled to an end effector closure sleeve or distal closure tube segment 1430 of the closure tube assembly 1400. As can be seen in FIG. 10, the distal closure tube segment 1430 includes upper and lower tangs 1434, 1436 that protrude proximally from a proximal end thereof. An upper double pivot link 1220 includes proximal and distal pins that engage corresponding holes in the upper tangs 1415, 1434 of the proximal closure tube segment 1410 and distal closure tube segment 1430, respectively. Similarly, a lower double pivot link 1222 includes proximal and distal pins that engage corresponding holes in the lower tangs 1416 and 1436 of the proximal closure tube segment 1410 and distal closure tube segment 1430, respectively. As will be discussed in further detail below, distal and proximal axial translation of the closure tube assembly 1400 will result in the closing and opening of the anvil 1130 relative to the elongate channel 1102.

[0369] As mentioned above, the interchangeable surgical tool assembly 1000 further includes a firing member assembly 1600 that is supported for axial travel within the spine assembly 1500. In the illustrated embodiment, the firing member assembly 1600 includes an intermediate firing shaft portion 1602 that is configured for attachment to a distal cutting portion or knife bar 1610. The firing member assembly 1600 may also be referred to herein as a “second shaft” and/or a “second shaft assembly”. As can be seen in FIGS. 7-10, the intermediate firing shaft portion 1602 may include a longitudinal slot 1604 in the distal end thereof which can be configured to receive a tab (not shown) on the proximal end of the knife bar 1610. The longitudinal slot 1604 and the proximal end of the knife bar 1610 can be sized and configured to permit relative movement therebetween and can comprise a slip joint 1612. The slip joint 1612 can permit the intermediate firing shaft portion 1602 of the firing member assembly 1600 to be moved to articulate the end effector 1100 without moving, or at least substantially moving, the knife bar 1610. Once the end effector 1100 has been suitably oriented, the intermediate firing shaft portion 1602 can be advanced distally until a proximal sidewall of the longitudinal slot 1604 comes into contact with the tab on the knife bar 1610 to advance the knife bar 1610 and fire the staple cartridge 1110 positioned within the elongate channel 1102. As can be further seen in FIGS. 8 and 9, the elastic spine member 1520 has an elongate opening or window 1525 therein to facilitate assembly and insertion of the intermediate firing shaft portion 1602 into the elastic spine member 1520. Once the intermediate firing shaft portion 1602 has been inserted therein, a top frame segment 1527 may be engaged with the elastic spine member 1520 to enclose the intermediate firing shaft portion 1602 and knife bar 1610 therein. Further description of the operation of the firing member assembly 1600 may be found in U.S. patent application Ser. No. 13/803,086, now U.S. Patent Application Publication No. 2014/0263541.

[0370] Further to the above, the interchangeable tool assembly 1000 can include a clutch assembly 1620 which can be configured to selectively and releasably couple the articulation driver 1800 to the firing member assembly 1600. In one form, the clutch assembly 1620 includes a lock collar, or sleeve 1622, positioned around the firing member assembly 1600 wherein the lock sleeve 1622 can be rotated between an engaged position in which the lock sleeve 1622 couples the articulation driver 1700 to the firing member assembly 1600 and a disengaged position in which the articulation driver 1700 is not operably coupled to the firing member assembly 1600. When lock sleeve 1622 is in its engaged position, distal movement of the firing member assembly 1600 can move the articulation driver 1700 distally and, correspondingly, proximal movement of the firing member assembly 1600 can move the articulation driver 1700 proximally. When lock sleeve 1622 is in its disengaged position, movement of the firing member assembly 1600 is not transmitted to the articulation driver 1700 and, as a result, the firing member assembly 1600 can move independently of the articulation driver 1700. In various circumstances, the articulation driver 1700 can be held in position by the articulation lock 1210 when the articulation driver 1700 is not being moved in the proximal or distal directions by the firing member assembly 1600.

[0371] Referring primarily to FIG. 7, the lock sleeve 1622 can comprise a cylindrical, or an at least substantially cylindrical, body including a longitudinal aperture 1624 defined therein configured to receive the firing member assembly 1600. The lock sleeve 1622 can comprise diametrically-opposed, inwardly-facing lock protrusions 1626, 1628 and an outwardly-facing lock member 1629. The lock protrusions 1626, 1628 can be configured to be selectively engaged with the intermediate firing shaft portion 1602 of the firing member assembly 1600. More particularly, when the lock sleeve 1622 is in its engaged position, the lock protrusions 1626, 1628 are positioned within a drive notch 1605 defined in the intermediate firing shaft portion 1602 such that a distal pushing force and/or a proximal pulling force can be transmitted from the firing member assembly 1600 to the lock sleeve 1622. When the lock sleeve 1622 is in its engaged position, the second lock member 1629 is received within a drive notch 1704 defined in the articulation driver 1700 such that the distal pushing force and/or the proximal pulling force applied to the lock sleeve 1622 can be transmitted to the articulation driver 1700. In effect, the firing member assembly 1600, the lock sleeve 1622, and the articulation driver 1700 will move together when the lock sleeve 1622 is in its engaged position. On the other hand, when the lock sleeve 1622 is in its disengaged position, the lock protrusions 1626, 1628 may not be positioned within the drive notch 1605 of the intermediate firing shaft portion 1602 of the firing member assembly 1600 and, as a result, a distal pushing force and/or a proximal pulling force may not be transmitted from the firing member assembly 1600 to the lock sleeve 1622. Correspondingly, the distal pushing force and/or the proximal pulling force may not be transmitted to the articulation driver 1700. In such circumstances, the firing member assembly 1600 can be slid proximally and/or distally relative to the lock sleeve 1622 and the proximal articulation driver 1700. The clutching assembly 1620 further includes a switch drum 1630 that interfaces with the lock sleeve 1622. Further details concerning the operation of the switch drum and lock sleeve 1622 may be found in U.S. patent application Ser. No. 13/803,086 and Ser. No. 15/019,196. The switch drum 1630 can further comprise at least partially circumferential openings 1632, 1634 defined therein which can receive circumferential mounts 1305 that extend from the nozzle halves 1302, 1304 and permit relative rotation, but not translation, between the switch drum 1630 and the proximal nozzle 1300. See FIG. 6. Rotation of the nozzle 1300 to a point where the mounts reach the end of their respective slots 1632, 1634 in the switch drum 1630 will result in rotation of the switch drum 1630 about the shaft axis SA. Rotation of the switch drum 1630 may ultimately result in the movement of the lock sleeve 1622 between its engaged and disengaged positions. In alternative embodiments, the nozzle 1300 may be employed to operably engage and disengage the articulation drive system with the firing drive system. As indicated above, clutch assembly 1620 may operate in the various manners described in further detail in U.S. patent application Ser. No. 13/803,086, now U.S. Patent Application Publication No. 2014/0263541, and U.S. patent application Ser. No. 15/019,196, which have each been herein incorporated by reference in their respective entirety.

[0372] In the illustrated arrangement, the switch drum 1630 includes a an L-shaped slot 1636 that extends into a distal opening 1637 in the switch drum 1630. The distal opening 1637 receives a transverse pin 1639 of a shifter plate 1638. In one example, the shifter plate 1638 is received within a longitudinal slot (not shown) that is provided in the lock sleeve 1622 to facilitate axial movement of the lock sleeve 1622 when engaged with the articulation driver 1700. Further details regarding the operation of the shifter plate and shift drum arrangements may be found in U.S. patent application Ser. No. 14/868,718, filed Sep. 28, 2015, entitled SURGICAL STAPLING INSTRUMENT WITH SHAFT RELEASE, POWERED FIRING AND POWERED ARTICULATION, the entire disclosure of which is hereby incorporated by reference herein.

[0373] As also illustrated in FIGS. 7 and 8, the interchangeable tool assembly 1000 can comprise a slip ring assembly 1640 which can be configured to conduct electrical power to and/or from the end effector 1100 and/or communicate signals to and/or from the end effector 1100, back to a microprocessor in the handle assembly or robotic system controller, for example. Further details concerning the slip ring assembly 1640 and associated connectors may be found in U.S. patent application Ser. No. 13/803,086, now U.S. Patent Application Publication No. 2014/0263541, and U.S. patent application Ser. No. 15/019,196 which have each been herein incorporated by reference in their respective entirety as well as in U.S. patent application Ser. No. 13/800,067, entitled STAPLE CARTRIDGE TISSUE THICKNESS SENSOR SYSTEM, now U.S. Patent Application Publication No. 2014/0263552, which is hereby incorporated by reference herein in its entirety. As also described in further detail in the aforementioned patent applications that have been incorporated by reference herein, the interchangeable surgical tool assembly 1000 can also comprise at least one sensor that is configured to detect the position of the switch drum 1630.

[0374] Referring again to FIG. 7, the chassis 1800 includes at least one, and preferably two, tapered attachment portions 1802 formed thereon that are adapted to be received within corresponding dovetail slots 507 formed within the distal end portion of the frame 506 of the handle assembly 500 as was discussed above. As can be further seen in FIG. 7, a shaft attachment lug 1605 is formed on the proximal end of the intermediate firing shaft 1602. As will be discussed in further detail below, when the interchangeable surgical tool assembly 1000 is coupled to the handle assembly 500, the shaft attachment lug 1605 is received in a firing shaft attachment cradle 542 that is formed in the distal end of the longitudinal drive member 540. See FIG. 3.

[0375] Various interchangeable surgical tool assemblies employ a latch system 1810 for removably coupling the interchangeable surgical tool assembly 1000 to the frame 506 of the handle assembly 500. As can be seen in FIG. 7, for example, in at least one form, the latch system 1810 includes a lock member or lock yoke 1812 that is movably coupled to the chassis 1800. In the illustrated embodiment, for example, the lock yoke 1812 has a U-shape with two spaced downwardly extending legs 1814. The legs 1814 each have a pivot lug (not shown) formed thereon that are adapted to be received in corresponding holes 1816 formed in the chassis 1800. Such arrangement facilitates pivotal attachment of the lock yoke 1812 to the chassis 1800. The lock yoke 1812 may include two proximally protruding lock lugs 1818 that are configured for releasable engagement with corresponding lock detents or grooves 509 in the distal end of the frame 506 of the handle assembly 500. See FIG. 3. In various forms, the lock yoke 1812 is biased in the proximal direction by a spring or biasing member 1819. Actuation of the lock yoke 1812 may be accomplished by a latch button 1820 that is slidably mounted on a latch actuator assembly 1822 that is mounted to the chassis 1800. The latch button 1820 may be biased in a proximal direction relative to the lock yoke 1812. The lock yoke 1812 may be moved to an unlocked position by biasing the latch button 1820 the in distal direction which also causes the lock yoke 1812 to pivot out of retaining engagement with the distal end of the frame 506. When the lock yoke 1812 is in “retaining engagement” with the distal end of the frame 506, the lock lugs 1818 are retainingly seated within the corresponding lock detents or grooves 509 in the distal end of the frame 506.

[0376] In the illustrated arrangement, the lock yoke 1812 includes at least one and preferably two lock hooks 1824 that are adapted to contact corresponding lock lug portions 1426 that are formed on the closure shuttle 1420. When the closure shuttle 1420 is in an unactuated position, the lock yoke 1812 may be pivoted in a distal direction to unlock the interchangeable surgical tool assembly 1000 from the handle assembly 500. When in that position, the lock hooks 1824 do not contact the lock lug portions 1426 on the closure shuttle 1420. However, when the closure shuttle 1420 is moved to an actuated position, the lock yoke 1812 is prevented from being pivoted to an unlocked position. Stated another way, if the clinician were to attempt to pivot the lock yoke 1812 to an unlocked position or, for example, the lock yoke 1812 was in advertently bumped or contacted in a manner that might otherwise cause it to pivot distally, the lock hooks 1824 on the lock yoke 1812 will contact the lock lugs 1426 on the closure shuttle 1420 and prevent movement of the lock yoke 1812 to an unlocked position.

[0377] Still referring to FIG. 10, the knife bar 1610 may comprise a laminated beam structure that includes at least two beam layers. Such beam layers may comprise, for example, stainless steel bands that are interconnected by, for example, welding or pinning together at their proximal ends and/or at other locations along their length. In alternative embodiments, the distal ends of the bands are not connected together to allow the laminates or bands to splay relative to each other when the end effector is articulated. Such arrangement permits the knife bar 1610 to be sufficiently flexible to accommodate articulation of the end effector. Various laminated knife bar arrangements are disclosed in U.S. patent application Ser. No. 15/019,245. As can also be seen in FIG. 10, a middle support member 1614 is employed to provide lateral support to the knife bar 1610 as it flexes to accommodate articulation of the surgical end effector 1100. Further details concerning the middle support member and alternative knife bar support arrangements are disclosed in U.S. patent application Ser. No. 15/019,245. As can also be seen in FIG. 10, a firing member or knife member 1620 is attached to the distal end of the knife bar 1610.

[0378] FIG. 11 illustrates one form of a firing member 1660 that may be employed with the interchangeable tool assembly 1000. In one exemplary form, the firing member 1660 comprises a body portion 1662 that includes a proximally extending connector member 1663 that is configured to be received in a correspondingly shaped connector opening 1614 in the distal end of the knife bar 1610. See FIG. 10. The connector 1663 may be retained within the connector opening 1614 by friction and/or welding or suitable adhesive, etc. The body portion 1662 protrudes through an elongate slot 1104 in the elongate channel 1102 and terminates in a foot member 1664 that extends laterally on each side of the body portion 1662. As the firing member 1660 is driven distally through the surgical staple cartridge 1110, the foot member 1664 rides within a passage 1105 in the elongate channel 1102 that is located under the surgical staple cartridge 1110. As can be seen in FIG. 11, one form of the firing member 1660 may further include laterally protruding central tabs, pins or retainer features 1680. As the firing member 1660 is driven distally through the surgical staple cartridge 1110, the central retainer features 1680 ride on the inner surface 1106 of the elongate channel 1102. The body portion 1662 of the firing member 1660 further includes a tissue cutting edge or feature 1666 that is disposed between a distally protruding hook feature 1665 and a distally protruding top nose portion 1670. As can be further seen in FIG. 11, the firing member 1660 may further include two laterally extending top tabs, pins or anvil engagement features 1665. As the firing member 1660 is driven distally, a top portion of the body 1662 extends through a centrally disposed anvil slot 1138 and the top anvil engagement features 1672 ride on corresponding ledges 1136 formed on each side of the anvil slot 1134. See FIGS. 13 and 14.

[0379] Returning to FIG. 10, the firing member 1660 is configured to operably interface with a sled assembly 1120 that is operably supported within the body 1111 of the surgical staple cartridge 1110. The sled assembly 1120 is slidably displaceable within the surgical staple cartridge body 1111 from a proximal starting position adjacent the proximal end 1112 of the cartridge body 1111 to an ending position adjacent a distal end 1113 of the cartridge body 1111. The cartridge body 1111 operably supports therein a plurality of staple drivers (not shown) that are aligned in rows on each side of a centrally disposed slot 1114. The centrally disposed slot 1114 enables the firing member 1660 to pass therethrough and cut the tissue that is clamped between the anvil 1130 and the staple cartridge 1110. The drivers are associated with corresponding pockets 1116 that open through the upper deck surface 1115 of the cartridge body. Each of the staple drivers supports one or more surgical staple or fastener (not shown) thereon. The sled assembly 1120 includes a plurality of sloped or wedge-shaped cams 1122 wherein each cam 1122 corresponds to a particular line of fasteners or drivers located on a side of the slot 1114. In the illustrated example, one cam 1122 is aligned with one line of “double” drivers that each support two staples or fasteners thereon and another cam 1122 is aligned with another line of “single” drivers on the same side of the slot 1114 that each operably support a single surgical staple or fastener thereon. Thus, in the illustrated example, when the surgical staple cartridge 1110 is “fired”, there will be three lines of staples on each lateral side of the tissue cut line. However, other cartridge and driver configurations could also be employed to fire other staple/fastener arrangements. The sled assembly 1120 has a central body portion 1124 that is configured to be engaged by the hook portion 1665 of the firing member 1660. Thus, when the firing member 1660 is fired or driven distally, the firing member 1660 drives the sled assembly 1120 distally as well. As the firing member 1660 moves distally through the cartridge 1110, the tissue cutting feature 1666 cuts the tissue that is clamped between the anvil assembly 1130 and the cartridge 1110 and the sled assembly 1120 drives the drivers upwardly in the cartridge which drive the corresponding staples or fasteners into forming contact with the anvil assembly 1130.

[0380] In those embodiments wherein the firing member includes a tissue cutting surface, it may be desirable for the elongate shaft assembly to be configured in such a way so as to prevent the inadvertent advancement of the firing member unless an unspent staple cartridge is properly supported in the elongate channel 1102 of the surgical end effector 1100. If, for example, no staple cartridge is present at all and the firing member is distally advanced through the end effector, the tissue would be severed, but not stapled. Similarly, if a spent staple cartridge (i.e., a staple cartridge wherein at least some of the staples have already been fired therefrom) is present in the end effector and the firing member is advanced, the tissue would be severed, but may not be completely stapled, if at all. It will be appreciated that such occurrences could lead to undesirable catastrophic results during the surgical procedure. U.S. Pat. No. 6,988,649 entitled SURGICAL STAPLING INSTRUMENT HAVING A SPENT CARTRIDGE LOCKOUT, U.S. Pat. No. 7,044,352 entitled SURGICAL STAPLING INSTRUMENT HAVING A SINGLE LOCKOUT MECHANISM FOR PREVENTION OF FIRING, and U.S. Pat. No. 7,380,695 entitled SURGICAL STAPLING INSTRUMENT HAVING A SINGLE LOCKOUT MECHANISM FOR PREVENTION OF FIRING, and U.S. patent application Ser. No. 14/742,933, entitled SURGICAL STAPLING INSTRUMENTS WITH LOCKOUT ARRANGEMENTS FOR PREVENTING FIRING SYSTEM ACTUATION WHEN A CARTRIDGE IS SPENT OR MISSING each disclose various firing member lockout arrangements. Each of those references is hereby incorporated by reference in its entirety herein.

[0381] An “unfired”, “unspent”, “fresh” or “new” cartridge 1110 means herein that the cartridge 1110 has all of its fasteners in their “ready-to-be-fired positions”. When in that position, the sled assembly 1120 is located in its starting position. The new cartridge 1110 is seated within the elongate channel 1102 and may be retained therein by snap features on the cartridge body that are configured to retainingly engage corresponding portions of the elongate channel 1102. FIGS. 15 and 18 illustrate a portion of the surgical end effector 1100 with a new or unfired surgical staple cartridge 1110 seated therein. As can be seen in those Figures, the sled assembly 1120 is in the starting position. To prevent the firing system from being activated and, more precisely, to prevent the firing member 1660 from being distally driven through the end effector 1110 unless an unfired or new surgical staple cartridge has been properly seated within the elongate channel 1102, the illustrated interchangeable surgical tool assembly 1000 employs a firing member lockout system generally designated as 1650.

[0382] Referring now to FIGS. 10 and 15-19, in one form, the firing member lockout system 1650 includes movable lock member 1652 that is configured to retainingly engage the firing member 1660 when a surgical staple cartridge 1110 is not properly seated within the elongate channel 1102. The lock member 1652 comprises at least one laterally moving locking portion 1654 that is configured to retainingly engage a corresponding portion of the firing member when the sled assembly 1120 is not present within the cartridge 1110 in its starting position. In the illustrated arrangement, the lock member 1652 employs two laterally moving locking portions 1654 wherein each locking portion 1654 engages a laterally extending portion of the firing member 1660.

[0383] In the illustrated embodiment, the lock member 1652 comprises a generally U-shaped spring member wherein each laterally movable leg or locking portion 1654 extends from a central spring portion 1653 and is configured to move in lateral directions represented by “L” in FIGS. 18 and 19. It will be appreciated that the term “lateral directions” refers to directions that are transverse to the shaft axis SA. The spring or lock member 1652 may be fabricated from high strength spring steel or similar material. The central spring portion 1653 may be seated within a slot 1236 in the end effector mounting assembly 1230. See FIG. 10. As can be seen in FIGS. 15-17, each of the laterally movable legs or locking portions 1654 has a distal end 1656 with a locking window 1658 therein. When the locking member 1652 is in a locked position, the central retainer feature 1680 on each lateral side extends into the corresponding locking window 1658 to retainingly prevent the firing member from being distally axially advanced.

[0384] Operation of the firing member lock out system will be explained with reference to FIGS. 15-19. FIGS. 15 and 18 illustrate a portion of the surgical end effector 1100 with a new unfired cartridge 1110 properly installed therein. As can be seen in those Figures, the sled assembly 1120 includes an unlocking feature 1126 that corresponds to each of the laterally movable locking portion 1654. In the illustrated arrangement, an unlocking feature 1126 is provided on or extends proximally from each of the central wedge-shaped cams 1122. In alternative arrangements, the unlocking feature 1126 may comprise a proximally protruding portion of the corresponding wedge-shaped cam 1122. As can be seen in FIG. 18, when the sled assembly 1120 is in its starting position, the unlocking features 1124 engage and bias the corresponding locking portions 1654 laterally in a direction that is transverse to the shaft axis SA. When the locking portions 1654 are in those unlocked orientations, the central retainer features 1680 are not in retaining engagement with their corresponding locking window 1658. When in those orientations, the firing member 1660 may be distally axially advanced (fired). However, when a cartridge is not present in the elongate channel 1102 or the sled assembly has been moved out of its starting position (meaning the cartridge is partially or completely fired), the locking portions 1654 spring laterally into retaining engagement with the firing member 1660. When in that position as illustrated in FIG. 19, the firing member 1660 cannot be moved distally.

[0385] FIGS. 16 and 17 illustrate the retraction of the firing member 1660 back to the starting position after firing the cartridge 1110 and driving the sled assembly 1120 distally. FIG. 16 depicts the initial reengagement of the retaining feature 1680 into its corresponding locking window 1658. FIG. 17 illustrates the retaining feature in its locked position when the firing member 1660 has been fully retracted back to its starting position. To assist in the lateral displacement of the locking portions 1654 when they are each initially contacted by the proximally moving retaining features 1680, each of the retaining features 1680 may be provided with a proximally facing, laterally tapered end portion. Such lockout system prevents actuation of the firing member 1660 when a new unfired cartridge is not present or when a new unfired cartridge is present, but has not been properly seated in the elongate channel 1102. In addition, the lockout system may prevent the clinician from distally advancing the firing member in the case where a spent or partially fired cartridge has been inadvertently properly seated within the elongate channel. Another advantage that may be provided by the lockout system 1650 is that, unlike other firing member lock out arrangements that require movement of the firing member into and out of alignment with the corresponding slots/passages in the staple cartridge, the firing member 1660 remains in alignment with the cartridge passages while in the locked and unlocked position. The locking portions 1654 are designed to move laterally into and out of engagement with corresponding sides of the firing member. Such lateral movement of the locking portions or portion is distinguishable from other locking arrangements that move in vertical directions to engage and disengage portions of the firing member.

[0386] Returning to FIGS. 13 and 14, in one form, the anvil 1130 includes an elongated anvil body portion 1132 and a proximal anvil mounting portion 1150. The elongated anvil body portion 1132 includes an outer surface 1134 that defines two downwardly extending tissue stop members 1136 that are adjacent to the proximal anvil mounting portion 1150. The elongated anvil body portion 1132 also includes an underside 1135 that defines an elongate anvil slot 1138. In the illustrated arrangement shown in FIG. 14, the anvil slot 1138 is centrally disposed in the underside 1135. The underside 1135 includes three rows 1140, 1141, 1142 of staple forming pockets 1143, 1144 and 1145 located on each side of the anvil slot 1138. Adjacent each side of the anvil slot 1138 are two elongate anvil passages 1146. Each passage 1146 has a proximal ramp portion 1148. See FIG. 13. As the firing member 1660 is advanced distally, the top anvil engagement features 1632 initially enter the corresponding proximal ramp portions 1148 and into the corresponding elongate anvil passages 1146.

[0387] Turning to FIGS. 12 and 13, the anvil slot 1138, as well as the proximal ramp portion 1148, extend into the anvil mounting portion 1150. Stated another way, the anvil slot 1138 divides or bifurcates the anvil mounting portion 1150 into two anvil attachment flanges 1151. The anvil attachments flanges 1151 are coupled together at their proximal ends by a connection bridge 1153. The connection bridge 1153 serves to provide support to the anvil attachment flanges 1151 and can serve to make the anvil mounting portion 1150 more rigid than the mounting portions of other anvil arrangements wherein the anvil attachment flanges are not connected at their proximal ends. As can also be seen in FIGS. 12 and 14, the anvil slot 1138 has a wide portion 1139 to accommodate the top portion and top anvil engagement features 1632 of the firing member 1660.

[0388] As can be seen in FIGS. 13 and 20-24, each of the anvil attachment flanges 1151 includes a transverse mounting hole 1156 that is configured to receive a pivot pin 1158 (FIGS. 10 and 20) therethrough. The anvil mounting portion 1150 is pivotally pinned to the proximal end 1103 of the elongate channel 1102 by the pivot pin 1158 which extends through mounting holes 1107 in the proximal end 1103 of the elongate channel 1102 and the mounting hole 1156 in anvil mounting portion 1150. Such arrangement serves to pivotally affix the anvil 1130 to the elongate channel 1102 for selective pivotal travel about a fixed anvil axis A-A which is transverse to the shaft axis SA. See FIG. 5. The anvil mounting portion 1150 also includes a cam surface 1152 that extends from a centralized firing member parking area 1154 to the outer surface 1134 of the anvil body portion 1132.

[0389] In the illustrated arrangement, the anvil 1130 is moved between an open position and closed positions by axially advancing and retracting the distal closure tube segment 1430. As will be discussed in further detail below, a distal end portion of the distal closure tube segment 1430 has an internal cam surface formed thereon that is configured to cammingly engage the cam surface 1552 or cam surfaces formed on the anvil mounting portion 1150. FIG. 22 illustrates a cam surface 1152a formed on the anvil mounting portion 1150 so as to establish a single contact path 1155a with the internal cam surface 1444, for example, on the distal closure tube segment 1430. FIG. 23 illustrates a cam surface 1152b that is configured relative to the internal cam surface 1444 on the distal closure tube segment to establish two separate and distinct arcuate contact paths 1155b between the cam surface 1152 on the anvil mounting portion 1150 and internal cam surface 1444 on the distal closure tube segment 1430. In addition to other potential advantages discussed herein, such arrangement may serve to better distribute the closure forces from the distal closure tube segment 1430 to the anvil 1130. FIG. 24 illustrates a cam surface 1152c that is configured relative to the internal cam surface 1444 of the distal closure tube segment 1430 to establish three distinct zones of contact 1155c and 1155d between the cam surfaces on the anvil mounting portion 1150 and the distal closure tube segment 1430. The zones 1155c, 1155d establish larger areas of camming contact between the cam surface or cam surfaces on the distal closure tube segment 1430 and the anvil mounting portion 1150 and may serve to better distribute the closure forces to the anvil 1130.

[0390] As the distal closure tube segment 1430 cammingly engages the anvil mounting portion 1150 of the anvil 1130, the anvil 1130 is pivoted about the anvil axis AA which results in the pivotal movement of the distal end of the end 1133 of elongate anvil body portion 1132 toward the surgical staple cartridge 1110 and distal end 1105 of the elongate channel 1102. As the anvil body portion 1132 begins to pivot, it contacts the tissue that is to be cut and stapled which is now positioned between the underside 1135 of the elongate anvil body portion 1132 and the deck 1116 of the surgical staple cartridge 1110. As the anvil body portion 1132 is compressed onto the tissue, the anvil 1130 may experience considerable amounts of resistive forces. These resistive forces are overcome as the distal closure tube 1430 continues its distal advancement. However, depending upon their magnitudes and points of application to the anvil body portion 1132, these resistive forces could tend to cause portions of the anvil 1130 to flex which may generally be undesirable. For example, such flexure may cause misalignment between the firing member 1660 and the passages 1148, 1146 within the anvil 1130. In instances wherein the flexure is excessive, such flexure could significantly increase the amount of firing force required to fire the instrument (i.e., drive the firing member 1660 through the tissue from its starting to ending position). Such excessive firing force may result in damage to the end effector, and/or the firing member, and/or the knife bar, and/or the firing drive system components, etc. Thus, it may be advantageous for the anvil to be constructed so as to resist such flexure.

[0391] FIGS. 25-27 illustrate an alternative anvil embodiment that includes features that may improve the stiffness of the anvil body and its resistance to flexure forces that may be generated during the closing and/or firing processes. The anvil 1130′ may otherwise be identical in construction to the anvil 1130 described above except for the differences discussed herein. As can be seen in those Figures, the anvil 1130′ has an elongate anvil body 1132′ that has an upper body portion 1165 that has an anvil cap 1170 attached thereto. In the embodiment depicted in FIGS. 25-27, the anvil cap 1170 is roughly rectangular in shape and has an outer cap perimeter 1172. The perimeter 1172 of the anvil cap 1170 is configured to be inserted through the correspondingly-shaped opening 1137 formed in the upper body portion 1165 and received on axially extending internal ledge portions 1139 formed therein. See FIG. 27. The internal ledge portions 1139 are configured to support the corresponding long sides 1177 of the anvil cap 1170. In an alternative embodiment, the anvil cap 1170 may be slide onto the internal ledges 1139 through an opening (not shown) in the distal end 1133 of the anvil body 1132′. In yet another embodiment, no internal ledge portions are provided. The anvil body 1132′ and the anvil cap 1170 may be fabricated from suitable metal that is conducive to welding. A first weld 1178 may extend around the entire cap perimeter 1172 of the anvil cap 1170 or it may only be located along the long sides 1177 of the anvil cap 1170 and not the distal end 1173 and/or proximal end 1175 thereof. The first weld 1178 may be continuous or it may be discontinuous or intermittent. In those embodiments where the first weld 1178 is discontinuous or intermittent, the weld segments may be equally distributed along the long sides 1177 of the anvil cap 1170 or the weld segments may be more densely spaced closer to the distal ends of the long sides 1177 or more densely spaced closer to the proximal ends of the long sides 1177. In still other arrangements, the weld segments may be more densely spaced in the center areas of the long sides 1177 of the anvil cap 1170.

[0392] FIGS. 28-30 illustrate an anvil cap 1170′ that is configured to be “mechanically interlocked” to the anvil body 1132′ as well as welded to the upper body portion 1165. In this embodiment, a plurality of retention formations 1182 are formed into the wall 1180 of the upper body portion 1165 that defines opening 1137. As used in this context, the term “mechanically interlocked” means that the anvil cap will remain affixed to the elongate anvil body regardless of the orientation of the elongate anvil body and without any additional retaining or fastening such as welding and/or adhesive, for example. The retention formations 1182 may protrude inwardly into the opening 1137 from the opening wall 1180. The retention formations 1182 may be integrally formed into the wall 1180 or otherwise be attached thereto. The retention formations 1182 are designed to frictionally engage a corresponding portion of the anvil cap 1170′ when it is installed in the opening 1137 to frictionally retain the anvil cap 1170′ therein. In the illustrated embodiment, the retention formations 1182 protrude inwardly into the opening 1137 and are configured to be frictionally received within a correspondingly shaped engagement area 1184 formed in the outer perimeter 1172′ of the anvil cap 1170′. In the illustrated arrangement, the retention formations 1182 only correspond to the long sides 1177′ of the anvil cap 1170′ and are not provided in the portions of the wall 1180 that correspond to the distal end 1173 or proximal end 1175 of the anvil cap 1170′. In alternative arrangements, the retention formations 1182 may also be provided in the portions of the wall 1180 that correspond to the distal end 1173 and proximal end 1175 of the anvil cap 1170′ as wall as the long sides 1177′ thereof. In still other arrangements, the retention formations 1182 may only be provided in the portions of the wall 1180 that correspond to one or both of the distal and proximal ends 1173, 1175 of the anvil cap 1170′. In still other arrangements, the retention formations 1182 may be provided in the portions of the wall 1180 corresponding to the long sides 1177′ and only one of the proximal and distal ends 1173, 1175 of the anvil cap 1170′. It will be further understood that the retention protrusions in all of the foregoing embodiments may be alternatively formed on the anvil cap with the engagement areas being formed in the elongate anvil body.

[0393] In the embodiment illustrated in FIGS. 28-30, the retention formations 1182 are equally spaced or equally distributed along the wall portions 1180 that correspond to the long sides 1177′ of the anvil cap 1170′. In alternative embodiments, the retention formations 1182 may be more densely spaced closer to the distal ends of the long sides 1177′ or more densely spaced closer to the proximal ends of the long sides 1177′. Stated another way, the spacing between those retention formations adjacent the distal end, the proximal end or both the distal and proximal ends may be less than the spacing of the formations located in the central portion of the anvil cap 1170′. In still other arrangements, the retention formations 1182 may be more densely spaced in the center areas of the long sides 1177′ of the anvil cap 1170′. Also in alternative embodiments, the correspondingly shaped engagement areas 1184 may not be provided in the outer perimeter 1172′ or in portions of the outer perimeter 1172′ of the anvil cap 1170′. In other embodiments, the retention formations and correspondingly shaped engagement areas may be provided with different shapes and sizes. In alternative arrangements, the retention formations may be sized relative to the engagement areas so that there is no interference fit therebetween. In such arrangements, the anvil cap may be retained in position by welding, adhesive, etc.

[0394] In the illustrated example, a weld 1178′ may extend around the entire perimeter 1172′ of the anvil cap 1170′ or the weld 1178′ may only be located along the long sides 1177′ of the anvil cap 1170′ and not the distal end 1173 and/or proximal end 1175 thereof. The weld 1178′ may be continuous or it may be discontinuous or intermittent. In those embodiments where the weld 1178′ is discontinuous or intermittent, the weld segments may be equally distributed along the long sides 1177′ of the anvil cap 1170′ or the weld segments may be more densely spaced closer to the distal ends of the long sides 1177′ or more densely spaced closer to the proximal ends of the long sides 1177′. In still other arrangements, the weld segments may be more densely spaced in the center areas of the long sides 1177′ of the anvil cap 1170′.

[0395] FIGS. 31 and 32 illustrate another anvil arrangement 1130″ that is has an anvil cap 1170″ attached thereto. In the depicted example, the anvil cap 1170″ is roughly rectangular in shape and has an outer cap perimeter 1172″. The outer cap perimeter 1172″ is configured to be inserted through the correspondingly-shaped opening 1137″ in upper body portion 1165 of the anvil body 1132″ and received on axially extending internal ledge portions 1139″ and 1190″ formed therein. See FIG. 32. The ledge portions 1139″ and 1190″ are configured to support the corresponding long sides 1177″ of the anvil cap 1170″. In an alternative embodiment, the anvil cap 1170″ may be slid onto the internal ledges 1139″ and 1190″ through an opening (not shown) in the distal end 1133″ of the anvil body 1132′. The anvil body 1132″ and the anvil cap 1170″ may be fabricated from metal material that is conducive to welding. A first weld 1178″ may extend around the entire perimeter 1172″ of the anvil cap 1170″ or it may only be located along the long sides 1177″ of the anvil cap 1170″ and not the distal end 1173″ and/or proximal end (not shown) thereof. The weld 1178″ may be continuous or it may be discontinuous or intermittent. It will be appreciated that the continuous weld embodiment has more weld surface area due to the irregularly shape perimeter of the anvil cap 1170″ as compared to the embodiments with a straight perimeter sides such as the anvil caps shown in FIG. 26, for example. In those embodiments where the weld 1178″ is discontinuous or intermittent, the weld segments may be equally distributed along the long sides 1177″ of the anvil cap 1170″ or the weld segments may be more densely spaced closer to the distal ends of the long sides 1177″ or more densely spaced closer to the proximal ends of the long sides 1177″. In still other arrangements, the weld segments may be more densely spaced in the center areas of the long sides 1177″ of the anvil cap 1170″.

[0396] Still referring to FIGS. 31 and 32, the anvil cap 1170″ may be additionally welded to the anvil body 1132″ by a plurality of second discrete “deep” welds 1192″. For example, each weld 1192″ may be placed at the bottom of a corresponding hole or opening 1194″ provided through the anvil cap 1170″ so that a discrete weld 1192″ may be formed along the portion of the anvil body 1132″ between the ledges 1190″ and 1139″. See FIG. 32. The welds 1192″ may be equally distributed along the long sides 1177″ of the anvil cap 1170″ or the welds 1192″ may be more densely spaced closer to the distal ends of the long sides 1177″ or more densely spaced closer to the proximal ends of the long sides 1177″. In still other arrangements, the welds 1192″ may be more densely spaced in the center areas of the long sides 1177″ of the anvil cap 1170″.

[0397] FIG. 33 illustrates another anvil cap 1170′″ that is configured to be mechanically interlocked to the anvil body 1132′″ as well as welded to the upper body portion 1165. In this embodiment, a “tongue-in-groove” arrangement is employed along each long side 1177′″ of the anvil cap 1170′″. In particular, a laterally extending continuous or intermittent tab 1195′″ protrudes from each of the long sides 1177′″ of the anvil cap 1170′″. Each tab 1195″ corresponds to an axial slot 1197′″ formed in the anvil body 1132′″. The anvil cap 1170′″ is slid in from an opening (not shown) in the distal end of the anvil body 1132′″ to “mechanically” affix the anvil cap to the anvil body 1132′″. The tabs 1195′″ and slots 1197′″ may be sized relative to each other to establish a sliding frictional fit therebetween. In addition, the anvil cap 1170′″ may be welded to the anvil body 1132′″. The anvil body 1132′″ and the anvil cap 1170′″ may be fabricated from metal that is conducive to welding. The weld 1178′″ may extend around the entire perimeter 1172′″ of the anvil cap 1170′″ or it may only be located along the long sides 1177′″ of the anvil cap 1170′″. The weld 1178′″ may be continuous or it may be discontinuous or intermittent. In those embodiments where the weld 1178′″ is discontinuous or intermittent, the weld segments may be equally distributed along the long sides 1177′″ of the anvil cap 1170′″ or the weld segments may be more densely spaced closer to the distal ends of the long sides 1177′″ or more densely spaced closer to the proximal ends of the long sides 1177′″. In still other arrangements, the weld segments may be more densely spaced in the center areas of the long sides 1177′″ of the anvil cap 1170′″.

[0398] The anvil embodiments described herein with anvil caps may provide several advantages. One advantage for example, may make the anvil and firing member assembly process easier. That is, the firing member may be installed through the opening in the anvil body while the anvil is attached to the elongate channel. Another advantage is that the upper cap may improve the anvil's stiffness and resistance to the above-mentioned flexure forces that may be experienced when clamping tissue. By resisting such flexure, the frictional forces normally encountered by the firing member 1660 may be reduced. Thus, the amount of firing force required to drive the firing member from its starting to ending position in the surgical staple cartridge may also be reduced.

[0399] As indicated above, as the anvil 1130 begins to pivot, the anvil body 1132 contacts the tissue that is to be cut and stapled which is positioned between the undersurface of the elongate anvil body 1132 and the deck of the surgical staple cartridge 1110. As the anvil body 1132 is compressed onto the tissue, the anvil 1130 may experience considerable amounts of resistive forces. To continue the closure process, these resistive forces must be overcome by the distal closure tube segment 1430 as it cammingly contacts the anvil mounting portion 1150. These resistive forces may be generally applied to the distal closure tube segment 1430 in the vertical directions V which, if excessive, could conceivably cause the distal closure tube segment 1430 to expand or elongate in the vertical direction (distance ID in FIG. 31 may increase). If the distal closure tube 1430 elongates in the vertical directions, the distal closure tube segment 1430 may not be able to effectively close the anvil 1130 and retain the anvil 1130 in the fully closed position. If that condition occurs, the firing member 1660 may encounter dramatically higher resistance which will then require higher firing forces to distally advance the firing member.

[0400] FIGS. 34 and 35 illustrate one form of a closure member for applying a closure motion to a movable jaw of a surgical instrument. In the illustrated arrangement, the closure member comprises, for example, a distal closure tube segment 1430 that has a closure body portion 1470. As discussed above, one form of the interchangeable surgical tool assembly 1000 is configured so as to facilitate selective articulation of the surgical end effector 1100. To facilitate such articulation, the distal closure tube segment 1430 is movably coupled to the proximal closure tube segment 1410 by means of an upper tang 1434 and a lower tang 1436 and upper and lower double pivot links 1220 and 1222. See FIG. 10. In one arrangement, the distal closure tube segment 1430 may be machined or otherwise formed from round bar stock manufactured from, for example, suitable metal material. In the illustrated arrangement, the closure body 1470 has an outer surface 1431 and an inner surface 1433 that defines an upper wall portion 1440 that has an upper wall cross-sectional thickness UWT and a lower wall portion 1442 that has a lower wall thickness LWT. The upper wall portion 1440 is located above the shaft axis SA and the lower wall portion 1442 is located below the shaft axis SA. The distal end 1441 of the upper wall portion 1440 has an internal cam surface 1444 formed thereon at a cam angle 0. Also in the illustrated embodiment, UWT>LWT which serves to provide a longer internal cam surface 1444 than might other wise be attainable if the distal closure tube segment has a uniform wall thickness. A long internal cam surface may be advantageous for transferring the closure forces to the cam surface(s) on the anvil mounting portion 1150. As can also be seen in FIGS. 34 and 35, the transitional sidewalls 1446, 1448 that are located on each side of the shaft axis SA between the upper wall portion 1440 and the lower wall portion 1442 comprise generally flat, vertically extending internal sidewall surfaces 1451, 1453 that may be generally parallel to each other. The transitional sidewalls 1446, 1448 each have a wall thickness that transitions from the upper wall thickness to the lower wall thickness.

[0401] In the illustrated arrangement, the distal closure tube segment 1430 also includes positive jaw or anvil opening features 1462 that correspond to each of the sidewalls 1446 and 1448 and protrude inwardly therefrom. As can be seen in FIGS. 34 and 35, the anvil opening features 1462 are formed on a lateral mounting body 1460 that sized to be received within a correspondingly-shaped cavity 1447, 1449 machined or otherwise formed in the transitional sidewalls 1446, 1448 adjacent the distal end 1438 of the distal closure tube segment 1430. The positive anvil opening features 1462 extend inwardly through corresponding openings 1450, 1452 in the transitional sidewalls 1446, 1448. In the illustrated arrangement, the lateral mounting bodies 1460 are welded to the distal closure tube segment 1430 with welds 1454. In addition to the welds or in alternative to the welds, the lateral mounting bodies 1460 may be retained in place with a mechanical/frictional fit, tongue-in-groove arrangements, adhesive, etc.

[0402] FIGS. 36-41 illustrate one example of the use of the distal closure tube segment 1430 to move the anvil 1130 from a fully closed position to a fully open position. FIGS. 36 and 39 illustrate the position of the distal closure tube segment 1430 and, more particularly the position of one of the positive anvil opening features 1462 when the distal closure tube segment 1430 is in the fully closed position. In the illustrated example, an anvil opening ramp 1162 is formed on the underside of each of the anvil attachment flanges 1151. When the anvil 1130 and the distal closure tube segment 1430 are in their fully closed positions shown in FIG. 36, each of the positive anvil opening features 1462 is located in a cavity 1164 that is established between the anvil opening ramps 1162 and the bottom portion of the elongate channel 1102. When in that position, the positive anvil opening features 1462 do not contact the anvil mounting portion 1150 or at least do not apply any significant opening motions or forces thereto. FIGS. 37 and 40 illustrate the positions of the anvil 1130 and the distal closure tube segment 1430 upon the initial application of an opening motion in the proximal direction PD to the distal closure tube segment 1430. As can be seen in FIG. 37, the positive jaw opening features 1462 have initially contacted the anvil opening ramps 1164 to cause the anvil 1130 to start pivoting to an open position. In the illustrated arrangement, each of the positive anvil opening features 1462 has a ramped or rounded distal end 1463 to facilitate better camming contact with the corresponding anvil opening ramp 1162. In FIGS. 38 and 41, the distal closure tube segment 1430 has been retracted back to its fully retracted position which has caused the positive anvil opening features 1462 to be driven to the distal ends of the anvil opening ramps 1162 which causes the anvil 1130 to be pivoted to its fully open position as shown therein. Other embodiments may not employ the positive jaw opening features, but may rely on springs or other biasing arrangements to bias the anvil to the open position when the distal closure tube segment has been retracted to its proximal-most starting position.

[0403] FIGS. 42 and 43 illustrate another closure member for applying closure motions to a movable jaw of a surgical instrument. In this example, the closure member comprises a distal closure tube segment 1430′ that may be similar to the distal closure tube segment 1430 without the positive anvil opening features. The distal closure tube segment 1430′ has a closure body 1470′ that has an outer surface 1440′ and an inner surface 1433′ that define an upper wall portion 1440′ and a lower wall portion 1442′. As indicated above, it may be desirable to employ as large of internal camming surface 1444′ as possible in order to maximize the camming contact with the camming surface on the anvil mounting portion 1150 to thereby effectively transfer the closure forces thereto. Thus, the upper wall portion 1440′ of the distal closure tube segment 1430′ may be provided with the thickest wall thickness UWT and the lower portion of the distal closure tube segment 1430′ may have the thinnest wall thickness LWT. For reference purposes, the UWT and LWT are measured along a common reference line that extends through a center axis or point C of the distal closure tube segment 1430′. Thus, where UWT is diametrically opposite from LWT, UWT>LWT. Such wall thickness arrangements facilitate formation of a longer internal camming surface 1444′.

[0404] As can be seen in FIG. 43, the distal closure tube segment 1430′ has an outer surface 1431′ that has circular cross-sectional shape. The distal closure tube segment 1430′ may be machined from solid bar stock. In the illustrated example, internal radius R₁ from a first center axis A_inner extends to the inner surface 1433′ and the outer radius R₂ from a second center axis A_outer extends to the outer surface 1431′. In the illustrated example, axis A_inner is offset by distance OR from axis A_outer and R₂>R₁.

[0405] FIG. 44 illustrates another closure member for applying closure motions to a movable jaw of a surgical instrument. In this example, the closure member comprises a distal closure tube segment 1430″ that has a closure body 1470″. The closure body 1470″ has an outer surface 1431′ and an inner surface 1433″ that define an upper wall portion 1440″ that has an upper wall thickness UWT and a lower wall portion 1442″ that has a lower wall thickness LWT and two sidewall portions 1435′ that each has a sidewall thickness SWT. In the illustrated example, UWT>LWT. In addition, SWT>UWT. Thus, SWT>UWT>LWT. In the illustrated arrangement, sidewall portions 1435′ have the same sidewall thickness SWT. In other arrangements, the sidewall portions 1435′ may have different thicknesses. As can be seen in FIG. 44, each sidewall portion 1435′ defines an internal, vertically extending internal surface portion 1437′. In the illustrated embodiment, the vertically extending internal surface portions are approximately parallel to each other. Such thicker vertical sidewall portions 1435′ may help to prevent or at least minimize the vertical elongation of the distal closure tube segment 1430″ when in use.

[0406] In the example depicted in FIG. 45, R₁ and R₂ are measured from a common center point or center axis C and R₁>R₂. Each of the sidewall portions 1435″ of the closure body portion 1470′″ of the distal closure tube segment 1430′″ that extend between the upper portion 1431″ and 1433″ have a sidewall thickness SWT that is approximately equal to the UWT at points along a horizontal reference line HR. The horizontal reference line HR is perpendicular to a vertical reference line VR that extends through the center axis C and along which the UWT and LWT may be measured and compared. Thus, SWT=UWT. In other examples, SWT, when measured along the horizontal reference line HR may be slightly less than the UWT. The SWT may continue to decrease until the side wall portions 1435′ transition into the lower portion 1433′ that has a constant lower wall thickness LWT. Thus, the inner sidewalls 1437″ extend at an angle A₂ when measured from a corresponding vertical reference axis VR′ that is perpendicular to the horizontal reference axis HR and parallel to vertical reference axis VR.

[0407] FIG. 46 illustrates another closure member for applying closure motions to a movable jaw of a surgical instrument. In this example, the closure member comprises a distal closure tube segment 1430″ that has a closure body 1470″ that has a round outer surface 1431″ and a rectangular shaped internal passage 1439 extending therethrough. The outer surface 1431″ is located a distance R from the geometric center point or center axis C. When measured along a vertical reference axis VR that extends through the center point or center axis C as shown, the upper wall thickness UWT is equal to the lower wall thickness LWT. When measure along a horizontal reference axis HR that extends through the center point or center axis C and which is perpendicular to the vertical reference axis VR, the thicknesses SWT of the sidewall portions 1437″ are greater than the upper wall and lower wall thicknesses UWT and LWT. Thus, SWT is greater than UWT and LWT. Stated another way, the portion of the distal closure tube segment 1430″ located above the horizontal reference line HR is a mirror image of the portion of the distal closure tube segment 1430″ located below the horizontal reference line HR. In this example, the side portions 1437″ are thicker than the upper and lower wall portions and may tend to prevent or minimize the tendency of the distal closure tube segment to elongate in the vertical directions. The internal camming surface may be formed on the distal end of the upper wall portion 1440″.

[0408] In the illustrated arrangement, the anvil 1130 is moved between open and closed positions by distally advancing the distal closure tube segment 1430. As can be seen in FIG. 41, when the anvil 1130 is in the fully open position, the distal ends 1163 of the anvil attachment flanges 1151 may extend above the deck surface 1116 of the staple cartridge 1110. When the closure process is commenced by distally advancing the distal closure tube segment in the distal direction DD, the distal ends 1163 of the anvil attachment flanges 1151 extend past the deck surface 1116 of the staple cartridge 1110 to thereby prevent infiltration of tissue therebetween which might hamper the closure process. See FIG. 40. Once the anvil 1130 has been moved to the fully closed position by the distal closure tube segment 1430, the distal ends 1461 of the lateral mounting bodies on the distal closure tube segment 1430 further act as tissue stops to prevent tissue from infiltrating therebetween. See FIG. 41.

[0409] FIG. 47 depicts portion of a surgical end effector 110′ that may be similar to the surgical end effector 110 of the interchangeable surgical tool assembly 100 of FIGS. 1 and 2. In the example illustrated in FIG. 47, the anvil 114 includes an elongate body portion 190 and an anvil mounting portion 192. The anvil mounting portion 192 comprises two spaced anvil mounting flanges 194 that protrude proximally from the elongate body portion 190. Each anvil mounting flange 194 has an outwardly extending trunnion 196 thereon. The trunnions 196 are each movably received within a corresponding kidney slot or elongated arcuate trunnion slot 197 that is provided in the elongate channel 112. When the anvil 114 is in a “fully opened” position, the trunnions 196 are generally located in the bottom portions 198 of the elongated arcuate trunnion slots 197. The anvil 114 can be moved to a closed position by distally advancing the distal closure tube segment 142 in the distal direction DD so that the end 148 of the distal closure tube segment 142 rides up a cam surface 193 that is formed on the anvil mounting portion 192 of the anvil 114. As the distal end 148 of the distal closure tube segment 142 is distally advanced along a cam surface 193 on the anvil mounting portion 192, the distal closure tube segment 142 causes the body portion 190 of the anvil 114 to pivot and move axially relative to the surgical staple cartridge 116. When the distal closure tube segment 142 reaches the end of its closure stroke, the distal end 148 of the distal closure tube segment 142 abuts/contacts an abrupt anvil ledge 191 and serves to position the anvil 114 so that the forming pockets (not shown) in the underside of the body portion 190 are properly aligned with the staples in the cartridge. The anvil ledge 191 is defined between the cam surface 193 on the anvil mounting portion 192 and the elongate anvil body portion 190. Stated another way, in this arrangement, the cam surface 193 does not extend to the outermost surface 195 of the anvil body 190. After the distal closure tube 142 has reached this fully extended position, any further application of closure motions/forces to the anvil 114, may cause damage to the anvil and/or the closure system components. As can be seen in FIG. 47, in this arrangement, the closure force F_H is parallel to the shaft axis SA. The distance between an axis or plane T_A passing through the centers of the trunnions 196 to the closure force vector F_H is represented as distance X_R. This distance X_R times the closure force F_H represents a closure moment C_M that is applied to the anvil 114.

[0410] FIGS. 48 and 49 illustrate the closure force configurations for an anvil 1130 of a surgical end effector 1100 of the interchangeable tool assembly 1000. As indicated above, the anvil trunnions 1158 are pivotally mounted within holes 1154 in the elongate channel 1102. Unlike the anvil 114 described above, the anvil 1130 does not move axially. Instead, the anvil 1130 is constrained to only pivot about the anvil axis AA. As the distal closure tube segment 1430 is advanced in the distal direction DD under the horizontal closure force F_H1, the interaction between the internal cam surface 1444 on the distal closure tube segment 1430 and the cam surface 1152 on the anvil mounting portion 1150 results in the distal closure tube segment 1430 experiencing a vertical closure force component V_F. The resultant force vector F_N experienced by the cam surface 1152 on the anvil mounting portion 1150 is “normal to” or perpendicular to the internal cam surface 1444. Angle Θ in FIGS. 48 and 49 represents the angle of the camming surface 1152 as a well as the internal camming surface 1440 to the horizontal. The distance between this resultant force vector F_N and an axis or plane T_A that extends through the centers of the anvil trunnions 1158 is represented as moment arm M_A. This moment arm distance M_A times the resultant force vector F_N represents a closure moment C_M1 that is applied to the anvil 1130. Thus, in applications wherein the horizontal closure forces F_H=F_H1, the actual amount of closure torque applied to anvil 1130 will be greater than the amount of closure torque applied to the anvil 114 because M_A>X_R and therefor the closure moment applied to the anvil 1130 will be greater than the closure moment applied to the anvil 114. FIG. 49 also illustrates the resistive forces established by the tissue during the closure process. F_T represents the force generated by the tissue when the tissue is clamped between the anvil and the staple cartridge. This “counter” moment M_T that is applied to the anvil 1130 equals the distance X_T between the tissue force T_F and the axis or plane T_A that extends through the centers of the anvil trunnions 1158 times the tissue force T_F. Thus, in order to achieve a desired amount of anvil closure, C_M1 must be greater than M_T.

[0411] Returning to the example depicted in FIG. 47, it can be seen that the firing bar 170 is attached to a firing member 174 that, when in a starting or unfired position, is located within the elongate channel 112 and, more particularly, is located completely distal to the distal closure tube segment 142 in a position wherein a top portion 175 of the firing member 174 is in contact with a portion of the anvil 114. Because the firing member 174 is located in a position wherein the top portion 175 thereof can contact the anvil as the anvil 114 is moved to the closed position, such arrangement may result in the need for higher closure forces to move the anvil 114 to a completely or fully closed position. In addition, when the firing system is activated, higher firing forces may be required to overcome the frictional interference between the top portion 175 of the firing member 174 and the anvil 114. Conversely as can be seen in FIG. 48, in the end effector 1100, the firing member 1660 is “parked” in the firing member parking area 1154 that is within the distal closure tube segment 1430. When the firing member 1660 is located within the firing member parking area 1154 within the distal closure tube segment 1430, it is unable to generate significant frictional forces with the anvil. Thus, one of the advantages that may be achieved by parking the firing member 1660 completely within the distal closure tube segment 1430 may be the reduction of the amount of closure force necessary to close the anvil to a fully closed position and/or a reduction in the amount of firing force needed to advance the firing member from the starting to ending position within the end effector. Stated another way, parking the firing member 1660 so that the firing member 1660 is completely proximal to the distal end of the distal closure tube segment 1430 and the internal cam surface 1444 thereon and in a starting position wherein any frictional contact between the firing member and the anvil is eliminated or reduced, may ultimately require lower closure and firing forces to be generated for operation of the end effector.

[0412] As discussed above, excessive flexure of the anvil during the closure and firing processes can lead to the need for undesirably higher firing forces. Thus, stiffer anvil arrangements are generally desirable. Returning to FIGS. 20 and 21, another advantage that may be provided by the anvil 1130 and elongate channel 1102 depicted therein is that the anvil mounting portion 1150 of the anvil 1130 is generally more robust and therefor stiffer than other anvil and elongate channel arrangements. FIG. 50 illustrates use of stiffener gussets 199 between the anvil mounting flanges 194 and the elongate anvil body portion 190. Similar gusset arrangements may also be employed between the anvil attachment flanges 1151 and anvil body 1132 of anvil 1130 to further enhance anvil stiffness.

[0413] As indicated above, the interchangeable surgical tool 1000 includes an elastic spine member 1520. As can be seen in FIGS. 6, 7, 7A, 8 and 51-54, the distal end portion 1522 of the elastic spine member 1520 is separated from the proximal end portion 1524 of the elastic spine member 15 by a stretch feature 1530 formed in the elastic spine member 1520. In addition, a stretch limiting insert 1540 is retainingly supported between the distal end portion 1522 and the proximal end portion 1524. In various arrangements, the elastic spine member 1520 may be fabricated from, for example, suitable polymeric material, rubber, etc. which has a modulus of elasticity designated as ME₁ for reference purposes. The stretch feature 1530 may include a plurality of stretch cavities 1532. As can be seen in FIG. 7A, the illustrated stretch feature 1530 includes four triangular-shaped stretch cavities 1532 that are arranged to define some what flexible wall segments 1534 therebetween. Other shapes and numbers of stretch cavities 1532 may be employed. The stretch cavities 1532 may be molded or machined into the elastic spine member 1520, for example.

[0414] Still referring to FIGS. 6, 7 and 51-54, the stretch limiting insert 1540 comprises a body portion 1541 which has a modulus of elasticity designated as ME₂ for reference purposes. As can be seen in FIG. 6, the body portion 1541 includes two downwardly extending mounting lugs 1542 that are each configured to be seated into mounting cavities 1535 formed in the elastic spine member 1520. See also FIG. 7A. To provide the stretch limiting insert 1540 with a desired amount of stretch capacity and elasticity, the body portion 1541 in the illustrated arrangement is provided with a plurality of upper cavities 1543. The illustrated example includes four upper cavities 1543 that are relatively square or rectangular in shape and which are spaced to define flexible walls 1544 therebetween. Other embodiments may include other numbers and shapes of upper cavities. The body portion 1541 of the illustrated stretch limiting insert 1540 also includes a centrally disposed, downwardly protruding central lug portion 1545 that is configured to be seated in a central cavity 1536 above the stretch feature 1530. See FIG. 7A. In the illustrated example, the central lug portion 1545 includes a pair of central passages 1546 that extend laterally therethrough to define a flexible wall 1547 therebetween.

[0415] Also in the illustrated example, the stretch limiting insert 1540 includes an elongated lateral cavity 1548 that is positioned on each lateral side of the body portion 1541. Only one lateral cavity 1548 may be seen in FIGS. 6 and 51-54. Each elongated lateral cavity 1548 is configured to support a corresponding stretch limiter 1550 therein. Thus, in the described example, two stretch limiters 1550 are employed in the stretch limiting insert 1540. In at least one arrangement, the stretch limiter 1550 includes an elongate body portion 1552 that terminates on each end with a downwardly extending mounting lug 1554. Each mounting lug 1554 is received in a corresponding lug cavity 1549 formed in the body portion 1541. The stretch limiter may have a modulus of elasticity for reference purposes of ME₃. In at least one arrangement, ME₃<ME₂<ME₁.

[0416] Actuation of the interchangeable surgical tool assembly 1000 when operably attached to the handle assembly 500 will now be described in further detail with reference to FIGS. 51-54. FIG. 51 illustrates the anvil 1130 in an open position. As can be seen in that Figure, the distal closure tube segment 1430 is in its starting or unactuated position and the positive anvil opening features 1462 have pivoted the anvil 1130 to the open position. In addition, the firing member 1660 is in the unactuated or starting position wherein the upper portion, including the top nose portion 1630, is parked in the firing member parking area 1154 of the anvil mounting portion 1150. When the interchangeable tool assembly 1000 is in this unactuated state, the stretch limiting insert 1540 is in an unstretched state. The axial length of the stretch limiting insert 1540 when in the unstretched state is represented by L_us in FIG. 51. L_us represents the distance between a reference axis A that corresponds to the proximal end of the body portion 1541 of the stretch limiting insert 1540 and a reference axis B that corresponds to the distal end of the body portion 1541 as shown in FIG. 51. The axis labeled F corresponds to the location of the distal end of the staple cartridge 1110 that has been properly seated within the elongate channel 1102. It will be understood that when the tool assembly 1000 is in this unactuated state, the elastic spine member 1520 is in a relaxed unstretched state.

[0417] FIG. 52 illustrates the interchangeable surgical tool assembly 1000 after the closure drive system 510 has been activated as described above to drive the distal closure tube segment 1430 distally in the distal direction DD. As the distal closure tube segment 1430 moves distally, the cam surface 1444 on the distal end 1441 of the upper wall portion 1440 of the distal closure tube segment 1430 cammingly contacts the cam surface 1152 on the anvil mounting portion 1150 and pivots the anvil 1130 to the closed position as shown. The closure drive system 510 moves the distal closure tube segment 1430 through its entire closure stroke distance and then is deactivated and the distal closure tube segment is axially locked or otherwise retained in that position by the closure drive system 510. As the distal closure tube segment 1430 contacts the anvil mounting portion 1150, the closure forces generated by the distal advancement of the distal closure tube segment 1430 on the anvil 1130 will also axially advance the anvil 1130 and the elongate channel 1102 in the distal direction DD. The stretch feature 1530 in the elastic spine 1520 will begin to stretch to accommodate this distal advancement of the elongate channel 1102 and anvil 1130. Axis B as shown in FIG. 52 is a reference axis for the stretch limiting insert 1540 when in a relaxed or unstretched state. Axis C corresponds to the end of the stretch limiting insert 1540 after the stretch limiting insert has been stretched into its maximum elongated stated. The distance L_S represents the maximum amount or length that the stretch limiting insert 1540 may elongate. Axis G corresponds to the location of the distal end of the surgical staple cartridge 1110 after the anvil 1130 has been moved to that “first” closed position. The distance L_T between reference axes F and G represents the axial distance that the elongate channel 1102 and the anvil 1130 have traveled during actuation of the closure drive system 510. This distance L_T may be equal to the distance L_S that the stretch limiting insert 1540 was stretched during the closure process as limited by the stretch limiter 1550.

[0418] Returning to FIG. 51, it can be noted that there is a space S between each mounting lug 1554 of the stretch limiter 1550 and the inner walls 1551 of each of the lug cavities 1549 prior to commencement of the closure process. As can be seen in FIG. 52 the spaces S are gone. That is, each of the mounting lugs 1554 abuts its corresponding cavity wall 1549 in the stretch limiting insert 1540. Thus the stretch limiter 1550 serves to limit the amount of elongation experienced by the stretch limiting insert 1540 which in turn limits the amount of distal travel of the elongate channel 1102 and anvil 1130 relative to the proximal end portion 1524 of the elastic spine 1520. The distal closure tube 1430 is axially locked in position by the closure drive system 510. When in that position, the anvil 1130 is retained in a “first” closed position relative to the surgical staple cartridge 1110. Because the firing drive system 530 has yet to be actuated, the firing member 1660 has not moved and remains parked in the firing member parking area 1154. The position of the underside of the anvil 1130 when in the “first” closed position is represented by axis K in FIGS. 52 and 53.

[0419] FIG. 53 illustrates the position of the firing member 1660 after the firing drive system 530 has been initially actuated. As can be seen in that Figure, the firing member 1660 has been distally advanced out of the firing member parking area 1154. The top portion of the firing member 1660 and, more specifically, each of the top anvil engagement features 1672 has entered the proximal ramp portion 1138 of the corresponding axial passage 1146 in the anvil 1130. At this point in the process, the anvil 1130 may be under considerable bending stress caused by the tissue that is clamped between the underside of the anvil 1130 and the deck of the staple cartridge 1110. This bending stress, as well as the frictional resistance between the various portions of the firing member and the anvil 1130 and elongate channel 1102, serve to essentially retain the elongate channel 1102 and the distal closure tube segment in a static condition while the firing member 1660 is initially distally advanced. During this time period, the amount of force required to fire the firing member 1660 or, stated another way, the amount of force required to distally push the firing member 1660 through the tissue that is clamped between the anvil 1130 and the cartridge 1110 is increasing. See line 1480 in FIG. 55. Also during this time period, the stretch limiting insert is trying to retract the elongate channel 1102 and anvil 1130 in the proximal direction PD into the distal closure tube segment 1430. Once the amount of friction between the firing member 1660 and the anvil 1130 and elongate channel 1102 is less than the retraction force generated by the stretch limiting insert 1540, the stretch limiting insert 1540 will cause the elongate channel 1102 and anvil 1130 to be drawn proximally further into the distal closure tube segment 1430. The position of the distal end 1113 of the staple cartridge 1110 after the elongate channel 1102 and anvil 1130 have traveled in the proximal direction PD is represented as position H in FIG. 54. The axial distance that the elongate channel 1102 and the anvil 1130 traveled in the proximal direction PD is represented as distance I in FIG. 54. This proximal movement of the anvil 1130 and the elongate channel 1102 into the distal closure tube segment 1430 will result in the application of additional closure forces to the anvil 1130 by the distal closure tube segment 1430. Line M in FIG. 54 represents the “second” closed position of the anvil 1130. The distance between position K and position M which is represented as distance N comprises the vertical distance that the distal end 1133 of the anvil body 1132 traveled between the first closed position and the second closed position.

[0420] The application of additional closure forces to the anvil 1130 by the distal closure tube segment 1430 when the anvil 1130 is in the second closed position, resists the amount of flexure forces applied to the anvil 1130 by the tissue that is clamped between the anvil 1130 and the cartridge 1110. Such condition may lead to better alignment between the passages in the anvil body 1130 and the firing member 1660 which may ultimately reduce the amount of frictional resistance that the firing member 1660 experiences as it continues to advance distally through the end effector 1100. Thus, the amount of firing force required to advance the firing member through the balance of its firing stroke to the ending position may be reduced. This reduction of the firing force can be seen in the chart in FIG. 55. The chart depicted in FIG. 55 compares the firing force (Energy) required to fire the firing member from the beginning to the end of the firing process. Line 1480 represents the amount of firing force required to move the firing member 1660 from its starting to ending position when the end effector 1100 is clamping tissue therein. Line 1482, for example, represents the amount of firing force required to move the firing member the interchangeable surgical tool assembly 1000 described above. Line 1482 represents the firing force required to move the firing member 174 from its starting to ending position through tissue that is clamped in the end effector 110 or 110′. As can be seen from that chart, the firing forces required by both of the surgical tool assemblies 100, 1000 are substantially the same or very similar until the point in time 1484 wherein the elastic spine assembly 1510 of the interchangeable tool assembly 1000 results in an application of a second amount of closure force to the anvil. As can be seen in the chart of FIG. 55, when the second amount of closure force is experienced by the anvil 1130 (point 1484), the amount of closure force required to complete the firing process is less than the amount of closure force required to complete the closing process in tool assembly 100.

[0421] FIG. 56 compares the amount of firing load required to move a firing member of various surgical end effectors from a starting position (0.0) to an ending position (1.0). The vertical axis represents the amount of firing load and the horizontal axis represents the percentage distance that the firing member traveled between the starting position (0.0) and the ending position (1.0). Line 1490 depicts the firing force required to fire, for example, the firing member of a surgical tool assembly 100 or similar tool assembly. Line 1492 depicts the firing force required to fire the firing member of a surgical tool assembly that employs the various firing member improvements and configurations that may be disclosed in, for example, U.S. Patent Application Ser. No. ______, entitled STAPLE CARTRIDGE COMPRISING STAPLES WITH DIFFERENT CLAMPING BREADTHS; Attorney Docket No. END8047USNP/160195, and the other above-mentioned U.S. Patent Applications that were filed on even date herewith and which have been incorporated by reference herein in their respective entirety. Line 1494 depicts the firing force required to fire the firing member from its starting to ending position of surgical tool assemblies that employ at least some of the features and arrangements disclosed herein for stiffening the anvil. Line 1496 depicts the firing force required to fire, for example, surgical tool assemblies that employ the elastic spine arrangement and at least some of the features and arrangements disclosed herein for stiffening the anvil. As can be seen in that Figure, the surgical tool assembly that employs the elastic spine arrangement and at least some of the anvil stiffening arrangements disclosed herein have a much lower force-to-fire requirement.

[0422] FIG. 57 provides a side-by-side comparison of two anvils. A portion of a first anvil 2030 of an end effector 2000 is depicted in the right half of FIG. 57 and a portion of a second anvil 2030′ of an end effector 2000′ is depicted in the left half of FIG. 57. The anvil 2030 comprises a first longitudinal row of forming pockets 2032a, a second longitudinal row of forming pockets 2032b, and a third longitudinal row of forming pockets 2032c. The anvil 2030 further comprises a longitudinal slot 2033 which is configured to receive a firing member, such as firing member 2040, for example, as the firing member is advanced through a staple firing stroke. The first longitudinal row of forming pockets 2032a is positioned intermediate the longitudinal slot 2033 and the second longitudinal row of forming pockets 2032b, and the second longitudinal row of forming pockets 2032b is positioned intermediate the first longitudinal row of forming pockets 2032a and the third longitudinal row of forming pockets 2032c. As a result, the first longitudinal row of forming pockets 2032a comprises an inner row, the third longitudinal row of forming pockets 2032c comprises an outer row, and the second longitudinal row of forming pockets 2032b comprises a middle or intermediate row.

[0423] Similar to the above, the anvil 2030′ comprises a first longitudinal row of forming pockets 2032a, a second longitudinal row of forming pockets 2032b, and a third longitudinal row of forming pockets 2032c. The anvil 2030′ further comprises a longitudinal slot 2033′ which is configured to receive a firing member, such as firing member 2040′, for example, as the firing member is advanced through a staple firing stroke. The first longitudinal row of forming pockets 2032a is positioned intermediate the longitudinal slot 2033′ and the second longitudinal row of forming pockets 2032b, and the second longitudinal row of forming pockets 2032b is positioned intermediate the first longitudinal row of forming pockets 2032a and the third longitudinal row of forming pockets 2032c. As a result, the first longitudinal row of forming pockets 2032a comprises an inner row, the third longitudinal row of forming pockets 2032c comprises an outer row, and the second longitudinal row of forming pockets 2032b comprises a middle or intermediate row.

[0424] The anvil 2030 comprises a flat, or an at least substantially flat, tissue engaging surface 2031. The forming pockets 2032a, 2032b, and 2032c are defined in the flat surface 2031. The flat surface 2031 does not have steps defined therein; however, embodiments are envisioned in which the anvil 2030 can comprise a stepped tissue engaging surface. For instance, the anvil 2030′ comprises a stepped tissue engaging surface 2031′. In this embodiment, the forming pockets 2032a and 2032b are defined in a lower step and the forming pockets 2032c are defined in an upper step.

[0425] The firing member 2040′ comprises a coupling member 2042′ including a cutting portion 2041. The cutting portion 2041 is configured and arranged to incise tissue captured between the anvil 2030′ and a staple cartridge 2010 (FIG. 58), for example. The firing member 2040′ is configured to push a sled having inclined surfaces distally during a staple firing stroke. The inclined surfaces are configured to lift staple drivers within the staple cartridge 2010 to form staples 2020 against the anvil 2030′ and eject the staples 2020 from the staple cartridge 2010. The coupling member 2042′ comprises projections, or cams, 2043′ extending laterally therefrom which are configured to engage the anvil 2030′ during the staple firing stroke. Referring to FIG. 60, the projections 2043′ are comprised of longitudinally elongate shoulders extending from the coupling member 2042′. In other embodiments, the projections 2043′ comprise a cylindrical pin which extends through the coupling member 2042′. In any event, the projections 2043′ have flat lateral sides, or ends, 2047′.

[0426] The longitudinal slot 2033′ comprises lateral portions 2033l′ extending laterally from a central portion 2033c′ which are configured to receive the projections 2043′. As illustrated in FIG. 57, the lateral portions 2033l′ of the longitudinal slot 2033′ have a rectangular, or at least substantially rectangular, configuration having sharp corners. Each lateral portion 2033l′ of the slot 2033′ comprises a longitudinal cam surface 2035′ configured to be engaged by the projections 2043′ during the staple firing stroke. Each longitudinal cam surface 2035′ is defined on the upper side of a ledge 2037′ which extends longitudinally along the slot 2033′. Each longitudinal ledge 2037′ comprises a beam including a fixed end attached to the main body portion of the anvil 2030′ and a free end configured to move relative to the fixed end. As such, each longitudinal ledge 2037′ can comprise a cantilever beam.

[0427] The coupling member 2042′ further comprises a foot, or cam, 2044 (FIG. 58) configured to engage the staple cartridge 2010, or a jaw supporting the staple cartridge 2010, during the staple firing stroke. Moreover, the projections 2043′ and the foot 2044 co-operate to position the anvil 2030′ and the staple cartridge 2010 relative to one another. When the anvil 2030′ is movable relative to the staple cartridge 2010, the coupling member 2042′ can cam the anvil 2030′ into position relative to the staple cartridge 2010. When the staple cartridge 2010, or the jaw supporting the staple cartridge 2010, is movable relative to the anvil 2030′, the coupling member 2042′ can cam the staple cartridge 2010 into position relative to the anvil 2030′.

[0428] Further to the above, the firing member 2040 comprises a coupling member 2042 including a cutting portion 2041. The cutting portion 2041 is configured and arranged to incise tissue captured between the anvil 2030 and a staple cartridge 2010 (FIG. 58). The firing member 2040 is configured to push a sled having inclined surfaces distally during a staple firing stroke. The inclined surfaces are configured to lift staple drivers within the staple cartridge 2010 to form staples 2020 against the anvil 2030 and eject the staples 2020 from the staple cartridge 2010. The coupling member 2042 comprises projections, or cams, 2043 extending laterally therefrom which are configured to engage the anvil 2030 during the staple firing stroke. The projections 2043 have curved, or rounded, lateral sides, or ends, 2047. The lateral ends 2047 of the projections 2043 are entirely curved or fully-rounded. Each lateral end 2047 comprises an arcuate profile extending between a top surface of a projection 2043 and a bottom surface of the projection 2043. In other embodiments, the lateral ends 2047 of the projections 2043 are only partially curved.

[0429] The longitudinal slot 2033 comprises lateral portions 2033l extending laterally from a central portion 2033c which are configured to receive the projections 2043. Each lateral portion 2033l of the slot 2033 comprises a longitudinal cam surface 2035 configured to be engaged by the projections 2043 during the staple firing stroke. Each longitudinal cam surface 2035 is defined on the upper side of a ledge 2037 which extends longitudinally along the slot 2033. Each longitudinal ledge 2037 comprises a beam including a fixed end attached to the main body portion of the anvil 2030 and a free end configured to move relative to the fixed end. As such, each longitudinal ledge 2037 can comprise a cantilever beam. As illustrated in FIG. 57, the lateral portions of the longitudinal slot 2033 comprise a curved, or rounded, profile which match, or at least substantially match, the curved ends 2047 of the projections 2043.

[0430] The coupling member 2042 further comprises a foot, or cam, 2044 (FIG. 58) configured to engage the staple cartridge 2010, or a jaw supporting the staple cartridge 2010, during the staple firing stroke. Moreover, the projections 2043 and the foot 2044 co-operate to position the anvil 2030 and the staple cartridge 2010 relative to one another. When the anvil 2030 is movable relative to the staple cartridge 2010, the coupling member 2042 can cam the anvil 2030 into position relative to the staple cartridge 2010. When the staple cartridge 2010, or the jaw supporting the staple cartridge 2010, is movable relative to the anvil 2030, the coupling member 2042 can cam the staple cartridge 2010 into position relative to the anvil 2030.

[0431] Referring again to FIG. 57, the lateral portions 2033l′ of the longitudinal slot 2033′ extend a distance 2034′ from a centerline CL of the anvil 2030′. The lateral portions 2033l′ extend over, or behind, the forming pockets 2032a in the anvil 2030′. As illustrated in FIG. 57, the lateral ends of the lateral portions 2033l′ are aligned with the outer edges of the forming pockets 2032a. Other embodiments are envisioned in which the lateral portions 2033l′ extend laterally beyond the forming pockets 2032a, for example. That said, referring to FIG. 59, the ledges 2037′ of the anvil 2030′ are long and, in certain instances, the ledges 2037′ can deflect significantly under load. In some instances, the ledges 2037′ can deflect downwardly such that a large portion of the drive surfaces 2045′ defined on the bottom of the projections 2043′ are not in contact with the cam surfaces 2035′. In such instances, the contact between the projections 2043′ and the cam surfaces 2035′ can be reduced to a point, such as point 2047′, for example. In some instances, the contact between the projections 2043′ and the cam surfaces 2035′ can be reduced to a longitudinally extending line, which may appear to be a point when viewed from the distal end of the end effector, as illustrated in FIG. 59.

[0432] Moreover, referring again to FIG. 57, the projections 2043′ extend over, or behind, the forming pockets 2032a in the anvil 2030′. The lateral ends of the projections 2043′ extend over a longitudinal centerline 2062a of the forming pockets 2032a. Other embodiments are envisioned in which the lateral ends of the projections 2043′ are aligned with the longitudinal centerline 2062a of the forming pockets 2032a. Certain embodiments are envisioned in which the lateral ends of the projections 2043′ do not extend to the longitudinal centerline 2062a of the forming pockets 2032a. In any event, referring again to FIG. 59, the projections 2043′ can deflect upwardly, especially when the projections 2043′ are long, such that a large portion of the drive surfaces 2045′ of the projections 2043′ are not in contact with the cam surfaces 2035′. This condition can further exacerbate the condition discussed above in connection with the ledges 2037′. That being said, the projections 2043′ may be able to better control the staple formation process occurring in the forming pockets 2032a, and/or the forming pockets 2032b and 2032c, when the projections 2043′ extend to the outer edge of the forming pockets 2032a or beyond, for instance.

[0433] Further to the above, the ledges 2037′ and the projections 2043′ can deflect in a manner which causes the load flowing between the firing member 2040′ and the anvil 2030′ to be applied at the inner ends of ledges 2037′. As illustrated in FIG. 59, the contact points 2048′ are at or near the inner ends of the ledges 2037′. The deflection of the ledges 2037′, and the projections 2043′, is the same or similar to that of cantilever beams. As the reader should appreciate, the deflection of a cantilever beam is proportional to the cube of the beam length when the load is applied at the end of the cantilever beam. In any event, gaps between the ledges 2037′ and the projections 2043′ can be created when the ledges 2037′ and/or the projections 2043′ deflect. Such gaps between portions of the ledges 2037′ and the projections 2043′ means that the forces flowing therebetween will flow through very small areas which will, as a result, increase the stress and strain experienced by the ledges 2037′ and projections 2043′. This interaction is represented by stress risers, or concentrations, 2039′ and 2049′ in FIGS. 61 and 62 where stress risers 2039′ are present in the ledges 2037′ and stress risers 2049′ are present at the interconnection between the projections 2043′ and the coupling member 2042′. Other stress risers, or concentrations, may be present but, as discussed below, it is desirable to reduce or eliminate such stress risers.

[0434] Referring again to FIGS. 57 and 58, the lateral portions 2033l of the longitudinal slot 2033 each extend a distance 2034 from a centerline CL of the anvil 2030. The distance 2034 is shorter than the distance 2034′. Nonetheless, the lateral portions 2033l extend over, or behind, the forming pockets 2032a in the anvil 2030. As illustrated in FIG. 57, the lateral ends of the lateral portions 2033l are not aligned with the outer edges of the forming pockets 2032a. Moreover, the lateral ends of the lateral portions 2033l do not extend beyond the outer edges of the forming pockets 2032a; however, the lateral portions 2033l extend over the longitudinal centerlines 2062a of the forming pockets 2032a. Further to the above, the ledges 2037 are shorter than the ledges 2037′. As such, the ledges 2037 will experience less deflection, stress, and strain than the ledges 2037′ for a given force applied thereto.

[0435] Other embodiments are envisioned in which the lateral portions 2033l of the slot 2033 do not extend to the longitudinal centerline 2062a of the forming pockets 2032a. In certain embodiments, the lateral portions 2033l do not extend laterally over or overlap the forming pockets 2032a. Such shorter lateral portions 2033l, further to the above, can reduce the deflection, stress, and strain in the ledges 2037. Owing to the reduced deflection of the ledges 2037, the drive surfaces 2045 defined on the bottom of the projections 2043 can remain in contact with the cam surfaces 2035 of the ledges 2037. In such instances, the contact area between the projections 2043 and the cam surfaces 2035 can be increased as compared to the contact area between the projections 2043′ and the cam surfaces 2035′.

[0436] Further to the above, the cross-sectional thickness of the ledges 2037 isn't constant, unlike the ledges 2037′ which have a constant cross-sectional thickness. The ledges 2037 have a tapered cross-sectional thickness where the base of each ledge 2037 is wider than its inner end owing to the rounded lateral ends of the lateral slot portions 2033l. Such a configuration can serve to stiffen or strengthen the ledges 2037 and reduce the deflection, stress, and strain of the ledges 2037 as compared to the ledges 2037′. In at least one instance, a portion of a ledge 2037 is tapered while another portion of the ledge 2037 has a constant cross-sectional thickness. In at least one other instance, the entirety of a ledge 2037 can be tapered such that none of the cross-sectional thickness is constant.

[0437] Moreover, referring again to FIGS. 57 and 58, the projections 2043 extend over, or behind, the forming pockets 2032a in the anvil 2030. The lateral ends of the projections 2043 do not extend over the longitudinal centerline 2062a of the forming pockets 2032a. Other embodiments are envisioned in which the lateral ends of the projections 2043 are aligned with the longitudinal centerline 2062a of the forming pockets 2032a. Certain embodiments are envisioned in which the lateral ends of the projections 2043 do not extend over the forming pockets 2032a at all. In any event, the upward deflection of the projections 2043 may be less than the projections 2043′ and, as a result, a larger contact area can be present between the drive surfaces 2045 and the cam surfaces 2035.

[0438] Further to the above, the ledges 2037 and the projections 2043 can deflect in a manner which causes the load flowing between the firing member 2040 and the anvil 2030 to be applied laterally along the lengths of the ledges 2037 instead of at a single point and/or at end of the ledges 2037. As a result, the forces flowing therebetween will flow through larger areas which will, as a result, reduce the stress and strain experienced by the ledges 2037 and projections 2043 which can reduce or eliminate the stress risers discussed above in connection with the ledges 2037′ and the projections 2043′, for example.

[0439] Referring again to FIG. 58, the foot 2044 of the coupling member 2042 is wider than the projections 2033. Stated another way, the lateral width of the foot 2044 is wider than the width between the lateral ends of the projections 2033. In such instances, the foot 2044 can deflect or strain more than the projections and, as a result, the deflection of the projections 2033 can be reduced. Alternative embodiments are envisioned in which the lateral width of the foot 2044 is the same as or less than the width between the lateral ends of the projections 2033; however, such embodiments can be otherwise configured to provide the desired deflection and/or strain within the projections 2033.

[0440] As discussed above, an end effector can comprise an anvil, for example, which is movable between an open position and a closed position. In some instances, the anvil is moved toward its closed position by a firing member, such as firing member 2040 or 2040′, for example, when the firing member is moved distally. In other instances, the anvil is moved toward its closed position prior to the firing member being advanced distally to perform a staple firing stroke. In either event, the anvil may not move into its entirely closed position until the firing member approaches or reaches the end of its staple firing stroke. As a result, the anvil is progressively closed by the firing member. In at least one such instance, the anvil may progressively close owing to thick tissue captured between the anvil and the staple cartridge. In some instances, the anvil may actually deflect or deform during the staple firing stroke of the firing member. Such circumstances are generally controlled, however, by the upper projections and the bottom foot of the firing member.

[0441] Turning now to FIG. 60, the drive surfaces 2045′ defined on the projections 2043′ are flat, or at least substantially flat. Moreover, the drive surfaces 2045′ are configured to flushingly engage the flat, or at least substantially flat, cam surfaces 2035′ defined on the anvil 2030′ when the anvil 2030′ is in a completely closed position. Stated another way, the drive surfaces 2045′ engage the cam surfaces 2035′ in a face-to-face relationship when the anvil 2030′ is in a completely flat orientation. A flat orientation of the anvil 2030′ is depicted in phantom in FIG. 60. In such instances, the drive surfaces 2045′ are parallel, or at least substantially parallel, to the longitudinal path of the firing member 2040′ during the staple firing stroke. As discussed above, however, the anvil 2030′ may progressively close during the firing stroke and, as a result, the anvil 2030′ may not always be in an entirely closed position. As a result, the drive surfaces 2045′ may not always be aligned with the cam surfaces 2035′ and, in such instances, the projections 2043′ may gouge into the ledges 2037′ of the anvil 2030. FIG. 60 depicts such instances with solid lines.

[0442] Further to the above, the drive surfaces 2045′ of the projections 2043′ and/or the cam surfaces 2035′ defined on the ledges 2037′ can plastically deform if the firing member 2040′ has to progressively close the anvil 2030′ into its entirely closed position. In certain instances, the cam surfaces 2035′ can gall, for example, which can increase the force needed to complete the staple firing stroke. More specifically, plastic strain of the projections 2043′ and/or the anvil ledges 2037′ can cause energy losses as the metal is deformed beyond the plastic limits. At that point, galling occurs and the frictional co-efficient of the coupling increases substantially. The energy losses can be in the order of about 10%-30%, for example, which can increase the force needed to fire the firing member in the order of about 10%-30%. Moreover, the force needed to complete subsequent staple firing strokes with the end effector 2000′ may increase in such instances in the event that the end effector 2000′ is reused.

[0443] Turning now to FIGS. 63-65, a firing member 2140 comprises a firing bar and a coupling member 2142 attached to the firing bar. The coupling member 2142 comprises a connector 2148 which connects the coupling member 2142 to the firing bar. The coupling member 2142 further comprises a cutting member 2041 configured to incise the tissue of a patient during a staple firing stroke. The coupling member 2142 also comprises projections 2143 configured to engage an anvil, such as anvil 2030 or 2030′, for example, and, in addition, a foot 2144 configured to engage a staple cartridge jaw during the staple firing stroke. Each projection 2143 comprises a drive surface 2145 defined on the bottom side thereof. Each projection 2143 further comprises a proximally-extending cam transition 2147 and a radiused-transition 2149 extending around the perimeter of the projection 2143. The coupling member 2142 further comprises intermediate projections 2146 extending laterally therefrom which are configured to prevent the firing member 2140 from performing the staple firing stroke when an unspent staple cartridge is not positioned in front of the firing member 2140 at the outset of the staple firing stroke.

[0444] Further to the above, the drive surfaces 2145 of the projections 2143 are not parallel to the longitudinal path 2160 of the firing member 2140. Rather, the drive surfaces 2145 extend transversely to the longitudinal path 2160. In at least one instance, the distal end of each drive surface 2145 is positioned further away from the longitudinal path 2160 than the proximal end. Such an arrangement can reduce or eliminate the problems described above in connection with the progressive closure of the anvil 2130. More specifically, in at least one instance, if the anvil 2130 will move through a range of motion between about 4 degrees and about 0 degrees with respect to the longitudinal path 2160 during the progressive closure, then the drive surface 2145 could be oriented at about 2 degrees with respect to the longitudinal path 2160, for example, which represents the midpoint in the range of progressive closure. Other embodiments are possible. For instance, if the anvil 2130 will move through a range of motion between about 1 degree and about 0 degrees with respect to the longitudinal path 2160 during the progressive closure, then the drive surfaces 2145 could be oriented at about 1 degree with respect to the longitudinal path 2160, for example, which represents the upper bound in the range of progressive closure. In various instances, the firing member 2140 may be required to progressively close the anvil 2130 through a 5 degree range of motion, for example. In other instances, the firing member 2140 may be required to progressively the anvil 2130 through a 10 degree range of motion, for example. In some instances, the anvil 2130 may not reach its completely closed position and, as a result, the progressive closure of the anvil 2130 may not reach 0 degrees.

[0445] Further to the above, the drive surface 2145 of the projection 2143 is not parallel to the drive surface of the foot 2144. Referring primarily to FIG. 64, the drive surface 2145 extends along an axis 2183 and the drive surface of the foot 2144 extends along an axis 2184. In at least one instance, the drive surface 2145 is oriented at an about 0.5 degree angle with respect to the drive surface of the foot 2144, for example. Other instances are envisioned in which the drive surface 2145 is oriented at an about 1 degree angle with respect to the drive surface of the foot 2144, for example. Certain instances, are envisioned in which the drive surface 2145 is oriented between about 0.5 degrees and about 5 degrees with respect to the drive surface of the foot 2144, for example. The drive surface of the foot 2144 is parallel to the longitudinal path 2160; however, other embodiments are envisioned in which the drive surface of the foot 2144 is not parallel to the longitudinal path 2160.

[0446] The examples provided above were discussed in connection with a movable anvil; however, it should be understood that the teachings of such examples could be adapted to any suitable movable jaw, such as a movable staple cartridge jaw, for example. Similarly, the examples provided elsewhere in this application could be adapted to any movable jaw.

[0447] Turning now to FIGS. 66-68, a firing member 2240 comprises a firing bar and a coupling member 2242 attached to the firing bar. The coupling member 2242 comprises a connector 2148 which connects the coupling member 2242 to the firing bar. The coupling member 2242 further comprises a cutting member 2041 configured to incise the tissue of a patient during a staple firing stroke. The coupling member 2242 also comprises projections 2243 configured to engage an anvil, such as anvil 2030 or 2030′, for example, and, in addition, a foot 2144 configured to engage a staple cartridge jaw during the staple firing stroke. Each projection 2243 comprises a drive surface 2245 defined on the bottom side thereof. Each projection 2243 further comprises a radiused-transition 2249 extending around the perimeter thereof. The coupling member 2242 further comprises intermediate projections 2146 extending laterally therefrom which are configured to prevent the firing member 2240 from performing the staple firing stroke when an unspent staple cartridge is not positioned in front of the firing member 2240 at the outset of the staple firing stroke.

[0448] Further to the above, each projection 2243 comprises a leading, or proximal, end 2251 configured to engage the anvil and, in addition, a trailing end. The leading end of each projection 2243 is different than the lagging, or trailing, end of the projection 2243. The leading end 2251 comprises a radius which extends from the bottom drive surface 2245 of the projection 2243 to a location positioned above a longitudinal centerline 2250 of the projection 2243. The leading end 2251 comprises a single radius of curvature; however, the leading end 2251 can be comprised of more than one radius of curvature. Each projection 2243 further comprises a radiused edge 2259 between the radiused leading end 2251 and the top surface of the projection 2243. The radius of curvature of the edge 2259 is smaller than the radius of curvature of the leading end 2251. Other embodiments are envisioned in which the entirety of, or at least a portion of, the leading end 2251 is linear. In any event, the configuration of the leading end 2251 can shift the force, or load, transmitted between the firing member 2240 and the anvil away from the leading end 2251 toward the trailing end of the projection 2243. Stated another way, the configuration of the leading end 2251 may prevent the leading end 2251 from becoming the focal point of the transmitted force between the firing member 2240 and the anvil. Such an arrangement can prevent or reduce the possibility of the firing member 2240 becoming stuck against the anvil and can reduce the force required to move the firing member 2240 distally.

[0449] Turning now to FIGS. 69-71, a firing member 2340 comprises a firing bar and a coupling member 2342 attached to the firing bar. The coupling member 2342 comprises a connector 2148 which connects the coupling member 2342 to the firing bar. The coupling member 2342 further comprises a cutting member 2041 configured to incise the tissue of a patient during a staple firing stroke. The coupling member 2342 also comprises projections 2343 configured to engage an anvil, such as anvil 2030 or 2030′, for example, and, in addition, a foot 2144 configured to engage a staple cartridge jaw during the staple firing stroke. Each projection 2343 comprises a drive surface defined on the bottom side thereof. Each projection 2343 further comprises a radiused-transition 2349 extending around the perimeter thereof. The coupling member 2342 further comprises intermediate projections 2146 extending laterally therefrom which are configured to prevent the firing member 2340 from performing the staple firing stroke when an unspent staple cartridge is not positioned in front of the firing member 2340 at the outset of the staple firing stroke.

[0450] Further to the above, each projection 2343 comprises a radiused leading end 2351. The leading end 2351 is similar to the leading end 2251 and comprises a curved surface which extends across the centerline 2350 of the projection 2343. The leading end 2251 has a different configuration than the trailing end of the projection 2243. Each projection 2343 further comprises a lateral side, or end, 2352. Each lateral end 2352 comprises a flat surface which is positioned intermediate radiused, or curved, edges 2347. A first radiused edge 2347 is positioned intermediate a top surface of the projection 2343 and the lateral end 2352 and, in addition, a second radiused edge 2347 is positioned intermediate a bottom surface of the projection 2343 and the lateral end 2352.

[0451] Turning now to FIGS. 72-74, a firing member 2440 comprises a firing bar and a coupling member 2442 attached to the firing bar. The coupling member 2442 comprises a connector 2148 which connects the coupling member 2442 to the firing bar. The coupling member 2442 further comprises a cutting member 2041 configured to incise the tissue of a patient during a staple firing stroke. The coupling member 2442 also comprises projections 2443 configured to engage an anvil, such as anvil 2030 or 2030′, for example, and, in addition, a foot 2144 configured to engage a staple cartridge jaw during the staple firing stroke. Each projection 2443 comprises a drive surface 2445 defined on the bottom side thereof. Each projection 2443 further comprises a radiused-transition extending around the perimeter thereof. The coupling member 2442 further comprises intermediate projections 2146 extending laterally therefrom which are configured to prevent the firing member 2440 from performing the staple firing stroke when an unspent staple cartridge is not positioned in front of the firing member 2440 at the outset of the staple firing stroke.

[0452] Further to the above, the lateral sides, or ends, of each projection 2443 are defined by more than one radius of curvature. Each projection 2443 comprises a first radius of curvature 2447a extending from the bottom drive surface 2445 and a second radius of curvature 2447b extending from the top surface of the projection 2443. The first radius of curvature 2447a is different than the second radius of curvature 2447b. For instance, the first radius of curvature 2447a is larger than the second radius of curvature 2447b; however, the curvatures 2447a and 2447b can comprise any suitable configuration. Referring primarily to FIG. 74, the first radius of curvature 2447a extends upwardly past a centerline 2450 of the projection 2443.

[0453] Turning now to FIGS. 75-77, a firing member 2540 comprises a firing bar and a coupling member 2542 attached to the firing bar. The coupling member 2542 comprises a connector 2148 which connects the coupling member 2542 to the firing bar. The coupling member 2542 further comprises a cutting member 2041 configured to incise the tissue of a patient during a staple firing stroke. The coupling member 2542 also comprises projections 2543 configured to engage an anvil, such as anvil 2030 or 2030′, for example, and, in addition, a foot 2144 configured to engage a staple cartridge jaw during the staple firing stroke. Each projection 2543 comprises a drive surface defined on the bottom side thereof. Each projection 2543 further comprises a radiused-transition extending around the perimeter thereof. The coupling member 2542 further comprises intermediate projections 2146 extending laterally therefrom which are configured to prevent the firing member 2540 from performing the staple firing stroke when an unspent staple cartridge is not positioned in front of the firing member 2540 at the outset of the staple firing stroke.

[0454] Further to the above, each projection 2543 comprises a lateral side, or end, 2552 which is flat, or at least substantially flat. Each projection 2543 further comprises a radiused transition 2547 extending around the lateral end 2552. Each projection 2543 is symmetrical, or at least substantially symmetrical, about a longitudinal centerline which extends through the lateral end 2552. Moreover, the top surface and the bottom surface of each projection 2543 are parallel to one another.

[0455] Referring primarily to FIG. 76, the leading end 2551 of each projection 2543 is positioned distally with respect to a cutting edge 2042 of the cutting portion 2041. The trailing end 2559 of each projection 2543 is positioned proximally with respect to the cutting edge 2042. As a result, the projections 2043 longitudinally span the cutting edge 2042. In such instances, the firing member 2540 can hold the anvil and the staple cartridge together directly at the location in which the tissue is being cut.

[0456] Turning now to FIGS. 78-80, a firing member 2640 comprises a firing bar and a coupling member 2642 attached to the firing bar. The coupling member 2642 comprises a connector 2148 which connects the coupling member 2642 to the firing bar. The coupling member 2642 further comprises a cutting member 2041 configured to incise the tissue of a patient during a staple firing stroke. The coupling member 2642 also comprises projections 2643 configured to engage an anvil, such as anvil 2030 or 2030′, for example, and, in addition, a foot 2144 configured to engage a staple cartridge jaw during the staple firing stroke. Each projection 2643 comprises a drive surface 2645 defined on the bottom side thereof. Each projection 2643 further comprises a radiused-transition 2649 extending around the perimeter thereof. The coupling member 2642 further comprises intermediate projections 2146 extending laterally therefrom which are configured to prevent the firing member 2640 from performing the staple firing stroke when an unspent staple cartridge is not positioned in front of the firing member 2640 at the outset of the staple firing stroke.

[0457] Further to the above, each projection 2643 further comprises a lateral end 2652, a bottom drive surface 2645, and a top surface 2647. The bottom drive surface 2645 is flat and is parallel to the longitudinal firing path 2660 of the firing member 2640. Referring primarily to FIG. 80, the top surface 2647 is flat, but not parallel to the longitudinal firing path 2660. Moreover, the top surface 2647 is not parallel to the bottom surface 2645. As a result, each projection 2643 is asymmetrical. In fact, the orientation of the top surface 2647 shifts the moment of inertia of the projection 2643 above the lateral end 2652. Such an arrangement can increase the bending stiffness of the projections 2643 which can reduce the deflection of the projections 2643.

[0458] Turning now to FIGS. 81-83, a firing member 2740 comprises a firing bar and a coupling member 2742 attached to the firing bar. The coupling member 2742 comprises a connector 2148 which connects the coupling member 2742 to the firing bar. The coupling member 2742 further comprises a cutting member 2041 configured to incise the tissue of a patient during a staple firing stroke. The coupling member 2742 also comprises projections 2743 configured to engage an anvil, such as anvil 2030 or 2030′, for example, and, in addition, a foot 2144 configured to engage a staple cartridge jaw during the staple firing stroke. Each projection 2743 comprises a drive surface defined on the bottom side thereof. The coupling member 2742 further comprises intermediate projections 2146 extending laterally therefrom which are configured to prevent the firing member 2740 from performing the staple firing stroke when an unspent staple cartridge is not positioned in front of the firing member 2740 at the outset of the staple firing stroke.

[0459] Further to the above, each projection 2743 comprises a first, or leading, portion 2753a and a second, or lagging, portion 2753b positioned distally behind the leading portion 2753a. The leading portion 2753a comprises a curved lead-in surface 2751 defined on the distal end thereof which is configured to initially engage the anvil. The leading portion 2753a further comprises a first, or leading, drive surface 2745a defined on the bottom side thereof. Similarly, the lagging portion 2753b comprises a second, or lagging, drive surface 2745b defined on the bottom side thereof. Each projection 2743 further comprises a transition 2752 defined between the leading portion 2753a and the lagging portion 2753b.

[0460] As the firing member 2740 is advanced distally, further to the above, the drive surfaces 2745a and 2745b can co-operate to engage and position the anvil. In certain embodiments, the drive surfaces 2745a and 2745b define a drive plane which is parallel, or at least substantially parallel, to the longitudinal path 2760 of the firing member 2740 during the staple firing stroke. In some instances, however, only the leading drive surface 2745a may engage the cam surface defined on the anvil. Such instances can arise when the firing member 2740 progressively closes the anvil, for example.

[0461] In other embodiments, referring to FIGS. 93 and 94, the leading drive surface 2745a is positioned above the lagging drive surface 2745b. Stated another way, the leading drive surface 2745a is positioned further away from the longitudinal path 2760 than the lagging drive surface 2745b such that both drive surfaces 2745a and 2745b remain in contact with the anvil during the staple firing stroke. In at least one instance, the drive surfaces 2745a and 2745b can define a drive plane which is transverse to the longitudinal path 2760. In certain instances, a 1 degree angle, for example, can be defined between the drive plane and the longitudinal path 2760. In various instances, the leading drive surface 2745a is positioned vertically above the lagging drive surface 2745b by approximately 0.001″, for example. In other embodiments, the leading drive surface 2745a is positioned vertically above the lagging drive surface 2745b by approximately 0.002″, for example. In certain instances, the leading drive surface 2745a is positioned above the lagging drive surface 2745b a distance which is between about 0.001″ and about 0.002″, for example

[0462] In certain instances, referring again to FIG. 93, only the lagging drive surfaces 2745b may be in contact with the cam surfaces of the anvil when the firing member 2740 progressively closes the anvil. In such instances, the leading drive surfaces 2745a are not in contact with the cam surfaces of the anvil. Such an arrangement can reduce the plastic deformation of the projections 2743 and reduce to force needed to advance the firing member 2740 distally as compared to when only the leading drive surfaces 2745a are in contact with the cam surfaces of the anvil. When the anvil begins to flex owing to the staple forming load being applied to the anvil, in some instances, the anvil can flex upwardly into contact with the leasing drive surfaces 2745a as illustrated in FIG. 94.

[0463] The leading portion 2753a is thicker than the lagging portion 2753b. Stated another way, the leading portion 2753a has a larger bending moment of inertia than the lagging portion 2753b which can resist the upward bending of the projection 2743. As a result, the lagging portion 2753b can deflect upwardly more than the leading portion 2753a. In such instances, it is more likely that both portions 2753a and 2753b of the projections 2743 can remain in contact with the anvil during the staple firing stroke even though the firing member 2740 is being used to progressively close the anvil. Moreover, the leading portion 2753a also has a larger shear thickness than the lagging portion 2753b which can better resist shear forces transmitted through the projections 2743. The leading portion 2753a is often exposed to greater shear forces than the lagging portion 2753b and, as a result, can benefit from the increased shear thickness. If it is believed that the lagging portion 2753b may experience greater shear forces than the leading projection 2753a, then the lagging portion 2753b can have a greater shear thickness than the leading portion 2753a, for example.

[0464] Turning now to FIGS. 84-86, a firing member 2840 comprises a firing bar and a coupling member 2842 attached to the firing bar. The coupling member 2842 comprises a connector 2148 which connects the coupling member 2842 to the firing bar. The coupling member 2842 further comprises a cutting member 2041 configured to incise the tissue of a patient during a staple firing stroke. The coupling member 2842 also comprises projections configured to engage an anvil, such as anvil 2030 or 2030′, for example, and, in addition, a foot 2144 configured to engage a staple cartridge jaw during the staple firing stroke. As described in greater detail below, each projection comprises a drive surface defined on the bottom side thereof. The coupling member 2842 further comprises intermediate projections 2146 extending laterally therefrom which are configured to prevent the firing member 2840 from performing the staple firing stroke when an unspent staple cartridge is not positioned in front of the firing member 2840 at the outset of the staple firing stroke.

[0465] Further to the above, each side of the coupling member comprises a first, or leading, projection 2843d and a second, or lagging, projection 2843p positioned behind the leading projection 2843d. The leading projection 2843d comprises a curved lead-in surface 2851d defined on the distal end thereof which is configured to initially engage the anvil. The leading projection 2843d further comprises a first, or leading, drive surface 2845d defined on the bottom side thereof. Similarly, the lagging projection 2843p comprises a curved lead-in surface 2851p defined on the distal end thereof which is configured to engage the anvil. The lagging projection 2843p further comprises a second, or lagging, drive surface 2845p defined on the bottom side thereof.

[0466] As the firing member 2840 is advanced distally, further to the above, the drive surfaces 2845d and 2845p can co-operate to engage and position the anvil. In certain embodiments, the drive surfaces 2845d and 2845p define a drive plane which is parallel, or at least substantially parallel, to the longitudinal path 2860 of the firing member 2840 during the staple firing stroke. In other embodiments, the leading drive surface 2845d is positioned above the lagging drive surface 2845p. Stated another way, the leading drive surface 2845d is positioned further away from the longitudinal path 2860 than the lagging drive surface 2845p. In at least one instance, the drive surfaces 2845d and 2845p can define a drive plane which is transverse to the longitudinal path 2860. In certain instances, a 1 degree angle, for example, can be defined between the drive plane and the longitudinal path 2860.

[0467] Further to the above, the leading projections 2843d and the lagging projections 2843p can move relative to each other. In various instances, a leading projection 2843d and a lagging projection 2843p on one side of the coupling member 2842 can move independently of one another. Such an arrangement can allow the projections 2843d and 2843p to independently adapt to the orientation of the anvil, especially when the firing member 2840 is used to progressively close the anvil. As a result, both of the projections 2843d and 2843p can remain engaged with the anvil such that forces flow between the firing member 2840 and the anvil at several locations and that the plastic deformation of the projections is reduced.

[0468] FIG. 91 depicts the energy required for a first firing member to complete a firing stroke, labeled as 2090′, and a second firing member to complete a firing stroke, labeled as 3090. The firing stroke 2090′ represents a condition in which significant plastic deformation and galling is occurring. The firing stroke 3090 represents an improvement over the firing stroke 2090′ in which the deformation of the firing member and anvil ledge is mostly elastic. It is believed that, in certain instances, the plastic strain experienced by the firing member and/or anvil can be reduced by about 40%-60%, for example, by employing the teachings disclosed herein.

[0469] The various embodiments described herein can be utilized to balance the loads transmitted between a firing member and an anvil. Such embodiments can also be utilized to balance the loads transmitted between a firing member and a staple cartridge jaw. In either event, the firing member can be designed to provide a desired result but it should be understood that such a desired result may not be achieved in some circumstances owing to manufacturing tolerances of the stapling instrument and/or the variability of the tissue thickness captured within the end effector, for example. In at least one instance, the upper projections and/or the bottom foot of the firing member, for example, can comprise wearable features which are configured to allow the firing member to define a balanced interface with the anvil.

[0470] Further to the above, referring now to FIGS. 87-90, a firing member 2940 comprises lateral projections 2943. Each projection 2943 comprises longitudinal ridges 2945 extending from the bottom thereof. The ridges 2945 are configured to plastically deform and/or smear when the firing member 2940 is advanced distally to engage the anvil. The ridges 2945 are configured to quickly wear in, or take a set, so as to increase the contact area between the projections 2943 and the anvil and provide better load balancing between the firing member 2940 and the anvil. Such an arrangement can be especially useful when the end effector is used to perform several staple firing strokes. In addition to or in lieu of the above, one or more wearable pads can be attached to the projections of the firing member which can be configured to plastically deform.

[0471] A surgical instrument comprising a firing member, a cartridge jaw, and an anvil jaw. The firing member comprises a longitudinal drive portion and a cam extending laterally from the longitudinal drive portion. The cartridge jaw comprises a longitudinal cartridge slot configured to receive the longitudinal drive portion of the firing member, and an inner longitudinal row of staple cavities adjacent the longitudinal cartridge slot. The cartridge jaw also comprises a lateral longitudinal row of staple cavities, wherein the inner longitudinal row of staple cavities is positioned intermediate the longitudinal cartridge slot, and the lateral longitudinal row of staple cavities. The cartridge jaw further comprises staples removably stored in the inner and lateral longitudinal rows of staple cavities, wherein the firing member is movable through the cartridge jaw to eject staples from the inner and lateral longitudinal rows of staple cavities. The anvil jaw comprises an inner longitudinal row of forming pockets registerable with the inner longitudinal row of staple cavities, and a lateral longitudinal row of forming pockets registerable with the lateral longitudinal row of staple cavities. The anvil jaw also comprises a longitudinal anvil slot comprising a center portion configured to receive the longitudinal drive portion of the firing member, and a lateral opening extending laterally from the center portion configured to receive the cam, wherein the lateral opening does not extend laterally beyond the inner longitudinal row of forming pockets.

[0472] The surgical instrument of Example 1, wherein the cam does not extend laterally beyond the inner longitudinal row of forming pockets.

[0473] The surgical instrument of Example 1, wherein the cam does not extend laterally to the inner longitudinal row of forming pockets.

[0474] The surgical instrument of Examples 1 or 2, wherein the inner longitudinal row of forming pockets comprises a centerline, and wherein the cam does not extend laterally beyond the centerline.

[0475] The surgical instrument of Examples 1 or 3, wherein the inner longitudinal row of forming pockets comprises a centerline, and wherein the cam does not extend laterally to the centerline.

[0476] The surgical instrument of Example 1, wherein the firing member further comprises a second cam extending laterally from the longitudinal drive portion, wherein the longitudinal anvil slot further comprises a second lateral opening extending laterally from the center portion configured to receive the second cam.

[0477] The surgical instrument of Example 6, wherein the cartridge jaw further comprises a second inner longitudinal row of staple cavities, wherein the inner longitudinal row of staple cavities and the second inner longitudinal row of staple cavities are positioned on opposite sides of the longitudinal cartridge slot, wherein the anvil jaw further comprises a second inner longitudinal row of forming pockets registerable with the second inner longitudinal row of staple cavities, and wherein the second lateral opening does not extend laterally beyond the second inner longitudinal row of forming pockets.

[0478] The surgical instrument of Examples 6 or 7, wherein the second cam does not extend laterally beyond the second inner longitudinal row of forming pockets.

[0479] The surgical instrument of Examples 6 or 7, wherein the second cam does not extend laterally to the second inner longitudinal row of forming pockets.

[0480] The surgical instrument of Example 7, wherein the second inner longitudinal row of forming pockets comprises a centerline, and wherein the second cam does not extend laterally beyond the centerline.

[0481] The surgical instrument of Example 7, wherein the second inner longitudinal row of forming pockets comprises a centerline, and wherein the second cam does not extend laterally to the centerline.

[0482] The surgical instrument of Examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11, wherein the anvil jaw is rotatable relative to the cartridge jaw between an open position and a closed position.

[0483] The surgical instrument of Examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12, wherein the cartridge jaw is rotatable relative to the anvil jaw between an open position and a closed position.

[0484] The surgical instrument of Examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,12, or 13, wherein at least a portion of the cartridge jaw is replaceable.

[0485] A surgical instrument comprising a firing member, a cartridge jaw, and an anvil jaw. The firing member comprises a longitudinal drive portion, and a cam extending laterally from the longitudinal drive portion. The cartridge jaw comprises a longitudinal cartridge slot configured to receive the longitudinal drive portion of the firing member, and an inner longitudinal row of staple cavities adjacent the longitudinal cartridge slot. The cartridge jaw also comprises a lateral longitudinal row of staple cavities, wherein the inner longitudinal row of staple cavities is positioned intermediate the longitudinal cartridge slot and the lateral longitudinal row of staple cavities. The cartridge jaw further comprise staples removably stored in the inner and lateral longitudinal rows of staple cavities, wherein the firing member is movable through the cartridge jaw to eject the staples from the inner and lateral longitudinal rows of staple cavities. The anvil jaw comprises an inner longitudinal row of forming pockets registerable with the inner longitudinal row of staple cavities, wherein the inner longitudinal row of forming pockets defines a centerline, and a lateral longitudinal row of forming pockets registerable with the lateral longitudinal row of staple cavities. The anvil jaw also comprises a longitudinal anvil slot including a center portion configured to receive the longitudinal drive portion of the firing member, and a lateral opening extending laterally from the center portion configured to receive the cam, wherein the lateral opening does not extend laterally beyond the centerline.

[0486] The surgical instrument of Example 15, wherein the cam does not extend laterally to the inner longitudinal row of forming pockets.

[0487] The surgical instrument of Example 15, wherein the cam does not extend laterally to the centerline.

[0488] The surgical instrument of Example 15, wherein the firing member further comprises a second cam extending laterally from the longitudinal drive portion, and wherein the longitudinal anvil slot further comprises a second lateral opening extending laterally from the center portion configured to receive the second cam.

[0489] The surgical instrument of Example 18, wherein the cartridge jaw further comprises a second inner longitudinal row of staple cavities, wherein the longitudinal row of staple cavities and the second inner longitudinal row of staple cavities are positioned on opposite sides of the longitudinal cartridge slot. The anvil jaw further comprises a second inner longitudinal row of forming pockets registerable with the second inner longitudinal row of staple cavities, wherein the second inner longitudinal row of forming pockets defines a second centerline, and wherein the second lateral opening does not extend laterally beyond the second centerline.

[0490] The surgical instrument of Example 19, wherein the second cam does not extend laterally to the second inner longitudinal row of forming pockets.

[0491] The surgical instrument of Example 19, wherein the second cam does not extend laterally to the second centerline.

[0492] The surgical instrument of Examples 15, 16, 17, 18, 19, 20, or 21, wherein the anvil jaw is rotatable relative to the cartridge jaw between an open position and a closed position.

[0493] The surgical instrument of Examples 15, 16, 17, 18, 19, 20, 21, or 22, wherein the cartridge jaw is rotatable relative to the anvil jaw between an open position and a closed position.

[0494] The surgical instrument of Examples 15, 16, 17, 18, 19, 20, 21, 22, or 23, wherein at least a portion of the cartridge jaw is replaceable.

[0495] A surgical instrument comprising a firing member, a cartridge jaw, and an anvil jaw. The firing member comprises a longitudinal drive portion, and a cam extending laterally from the longitudinal drive portion. The cartridge jaw comprises a longitudinal cartridge slot configured to receive the longitudinal drive portion of the firing member, and an inner longitudinal row of staple cavities adjacent the longitudinal cartridge slot. The cartridge jaw also comprises a lateral longitudinal row of staple cavities, wherein the inner longitudinal row of staple cavities is positioned intermediate the longitudinal cartridge slot and the lateral longitudinal row of staple cavities, and staples removably stored in the inner and lateral longitudinal rows of staple cavities, wherein the firing member is movable through the cartridge jaw to eject staples from the inner and lateral longitudinal rows of staple cavities. The anvil jaw comprises an inner longitudinal row of forming pockets registerable with the inner longitudinal row of staple cavities, wherein the inner longitudinal row of forming pockets defines a centerline, and a lateral longitudinal row of forming pockets registerable with the lateral longitudinal row of staple cavities. The anvil jaw also comprises a longitudinal anvil slot including a center portion configured to receive the longitudinal drive portion of the firing member, and a lateral opening extending laterally from the center portion configured to receive the cam, wherein the lateral opening does not extend laterally to the centerline.

[0496] The surgical instrument of Example 25, wherein the anvil jaw is rotatable relative to the cartridge jaw between an open position and a closed position.

[0497] The surgical instrument of Examples 25 or 26, wherein the cartridge jaw is rotatable relative to the anvil jaw between an open position and a closed position.

[0498] The surgical instrument of Examples 25, 26, or 27, wherein at least a portion of the cartridge jaw is replaceable.

[0499] A surgical instrument, comprising a firing member and an anvil jaw. The firing member comprises a longitudinal drive portion, and a cam extending laterally from the longitudinal drive portion. The anvil jaw comprises longitudinal rows of forming pockets and a longitudinal anvil slot. The longitudinal anvil slot comprises a center portion configured to receive the longitudinal drive portion of the firing member, and a lateral opening extending laterally from the center portion configured to receive the cam. The lateral opening includes a closed lateral end, wherein the closed lateral end is entirely curved.

[0500] The surgical instrument of Example 29, wherein the closed lateral end is defined by a single radius of curvature.

[0501] The surgical instrument of Examples 29 or 30, wherein the cam comprises a lateral cam end, and wherein the lateral cam end is defined by a radius or curvature which matches the single radius of curvature.

[0502] The surgical instrument of Examples 29 or 30, wherein the cam comprises a lateral cam end, and wherein the lateral cam end is defined by a radius of curvature which is smaller than the single radius of curvature.

[0503] The surgical instrument of Example 29, wherein the closed lateral end is defined by more than one radius of curvature.

[0504] The surgical instrument of Examples 29, 30, 31, 32, or 33, wherein the firing member further comprises a second cam extending laterally from the longitudinal drive portion, wherein the longitudinal anvil slot comprises a second lateral opening extending laterally from the center portion configured to receive the second cam, wherein the second lateral opening comprises a second closed lateral end, and wherein the second lateral end is entirely curved.

[0505] The surgical instrument of Examples 29, 30, 31, 32, 33, or 34, further comprising a cartridge jaw including a cartridge body, and a longitudinal cartridge slot configured to receive the longitudinal drive portion of the firing member. The cartridge jaw also comprises longitudinal rows of staple cavities registerable with the forming pockets and, in addition, staples removably stored in the longitudinal rows of staple cavities. The firing member is movable through the cartridge body to eject the staples from the longitudinal rows of staple cavities.

[0506] The surgical instrument of Example 35, wherein the anvil jaw is rotatable relative to the cartridge jaw.

[0507] The surgical instrument of Examples 35 or 36, wherein the cartridge jaw is rotatable relative to the anvil jaw.

[0508] The surgical instrument of Examples 35, 36, or 37, wherein at least a portion of the cartridge jaw is replaceable.

[0509] The surgical instrument of Example 29, wherein the closed lateral end comprises a circular profile.

[0510] The surgical instrument of Example 29, wherein the longitudinal drive portion comprises a first lateral width, wherein the cam comprises a second lateral width, and wherein second lateral width is less than ¾ of the first lateral width.

[0511] The surgical instrument of Example 29, wherein the longitudinal drive portion comprises a first lateral width, wherein the cam comprises a second lateral width, and wherein second lateral width is less than ⅔ of the first lateral width.

[0512] The surgical instrument of Example 29, wherein the longitudinal drive portion comprises a first lateral width, wherein the cam comprises a second lateral width, and wherein second lateral width is less than ½ of the first lateral width.

[0513] A surgical instrument comprising a firing member and an anvil jaw. The firing member comprises a longitudinal drive portion, and a cam extending laterally from the longitudinal drive portion. The anvil jaw comprises longitudinal rows of forming pockets and a longitudinal anvil slot. The longitudinal anvil slot comprises a center portion configured to receive the longitudinal drive portion of the firing member, and a lateral opening extending laterally from the center portion configured to receive the cam. The lateral opening comprises a closed lateral end, wherein the closed lateral end is circular.

[0514] A surgical instrument comprising a firing member and an anvil jaw. The firing member comprises a longitudinal drive portion, and a cam extending laterally from the longitudinal drive portion, wherein the cam comprises an arcuate lateral cam end. The anvil jaw comprises longitudinal rows of forming pockets, and a longitudinal anvil slot. The longitudinal anvil slot comprises a center portion configured to receive the longitudinal drive portion of the firing member, and a lateral slot extending laterally from the center portion configured to receive the cam. The lateral slot comprises an arcuate slot end, wherein the arcuate lateral cam end is closely received in the arcuate lateral slot end.

[0515] A surgical instrument comprising a firing system, a cartridge jaw, and an anvil jaw. The firing system comprises a cutting member, and a bottom cam extending laterally from the cutting member. The firing system also comprises a top cam, wherein the top cam comprises a base attached to the cutting member, a free end, and a tapered cross-section between the base and the free end. The bottom cam is configured to engage the cartridge jaw during a firing stroke of the firing system. The anvil jaw comprises longitudinal rows of forming pockets, and a longitudinal anvil slot. The longitudinal anvil slot comprises a center portion configured to receive the cutting member, and a lateral opening extending laterally from the center portion configured to receive the top cam during a firing stroke.

[0516] The surgical instrument of Example 45, wherein the anvil jaw is movable relative to the cartridge jaw between an open position and a closed position.

[0517] The surgical instrument of Examples 45 or 46, wherein the top cam is configured to engage the anvil jaw and move the anvil jaw toward the closed position.

[0518] The surgical instrument of Examples 45 or 46, wherein the top cam is configured to engage the anvil jaw and hold the anvil jaw in the closed position.

[0519] The surgical instrument of Example 45, wherein the cartridge jaw is movable relative to the anvil jaw between an open position and a closed position.

[0520] The surgical instrument of Example 49, wherein the bottom cam is configured to engage the cartridge jaw and move the cartridge jaw toward the closed position.

[0521] The surgical instrument of Example 49, wherein the bottom cam is configured to engage the cartridge jaw and hold the cartridge jaw in the closed position.

[0522] The surgical instrument of Examples 45, 46, 47, 48, 49, 50, or 51, wherein the cartridge jaw comprises a replaceable staple cartridge comprising staples removably stored therein.

[0523] The surgical instrument of Example 52, wherein the staple cartridge further comprises a sled including at least one inclined surface configured to eject the staples from the staple cartridge.

[0524] The surgical instrument of Example 45, wherein the cartridge jaw further comprises a sled configured to eject the staples from the staple cartridge.

[0525] The surgical instrument of Examples 45, 46, 47, 48, 49, 50, 51, 52, 53, or 54, wherein the tapered cross-section comprises a linear taper.

[0526] The surgical instrument of Examples 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, or 55, wherein the tapered cross-section comprises a non-linear taper.

[0527] A surgical instrument comprising a firing member, a cartridge jaw, and an anvil jaw. The firing member comprises a bottom cam extending laterally from the firing member, and a top cam. The top cam comprises a base attached to the firing member, a free end, and a sloped portion extending between the base and the free end. The bottom cam is configured to engage the cartridge jaw during a firing stroke of the firing member. The anvil jaw comprises longitudinal rows of forming pockets, and a longitudinal anvil slot. The longitudinal anvil slot comprises a vertical portion configured to receive the firing member, and a lateral opening extending laterally from the vertical portion configured to receive the top cam during the firing stroke.

[0528] A surgical system comprising a shaft portion defining a shaft longitudinal axis, and a firing member movable through a firing stroke. The firing member comprises a first cam extending laterally from the firing member, wherein the first cam defines a first longitudinal axis, and a second cam extending laterally from the firing member. The second cam defines a second longitudinal axis, wherein the first longitudinal axis and the second longitudinal axis are not parallel to one another. The surgical system also comprises a first jaw, wherein the first cam is configured to engage the first jaw during a firing stroke of the firing member. The surgical system further comprises a second jaw, wherein the second cam is configured to engage the second jaw during a firing stroke of the firing member, and wherein the first jaw is movable relative to the second jaw between an open position and a closed position.

[0529] The surgical system of Example 58, further comprising a replaceable staple cartridge including staples removably stored therein, wherein the firing member is configured to eject the staples from the staple cartridge during the firing stroke.

[0530] The surgical system of Examples 58 or 59, wherein the firing member further comprises a cutting portion configured to cut tissue clamped between the first jaw and the second jaw.

[0531] The surgical system of Examples 58, 59, or 60, wherein the first longitudinal axis is parallel to the shaft longitudinal axis, and wherein the second longitudinal axis is not parallel to the shaft longitudinal axis.

[0532] The surgical system of Examples 58, 59, or 60, wherein the first longitudinal axis is not parallel to the shaft longitudinal axis, and wherein the second longitudinal axis is parallel to the shaft longitudinal axis.

[0533] The surgical system of Examples 58, 59, 60, 61, or 62, wherein the first cam comprises a longitudinal ridge defined thereon which is configured to deform against the first jaw during the firing stroke.

[0534] The surgical system of Examples 58, 59, 60, 61, or 62, wherein the second cam comprises a longitudinal ridge defined thereon which is configured to deform against the second jaw during a firing stroke.

[0535] The surgical system of Examples 58, 59, 60, 61, or 62, wherein the first cam comprises a wear pad defined thereon which is configured to wear against the first jaw during a firing stroke.

[0536] The surgical system of Examples 58, 59, 60, 61, or 62, wherein the second cam comprises a wear pad defined thereon which is configured to wear against the second jaw during a firing stroke.

[0537] The surgical system of Examples 58, 59, 60, 61, or 62, wherein the first cam comprises a leading projection comprising a leading projection end. The first cam also comprises a trailing projection comprising a trailing projection end, wherein the leading projection end and the trailing projection end are movable relative to one another.

[0538] A surgical instrument comprising a firing member movable through a firing stroke, a cartridge jaw, and an anvil jaw. The firing member comprises a first cam extending laterally from the firing member, and a second cam extending laterally from the firing member. The second cam comprises a leading end, a trailing end, and an intermediate portion extending between the leading end and the trailing end. The leading end is positioned further away from the first cam than the trailing end. The first cam is configured to engage the cartridge jaw during a firing stroke of the firing member. The anvil jaw comprises longitudinal rows of forming pockets, wherein the second cam is configured to engage the anvil jaw during a firing stroke.

[0539] The surgical instrument of Example 68, wherein the intermediate portion is sloped relative to the first cam.

[0540] The surgical instrument of Examples 68 or 69, wherein the firing member is movable along a firing path during a firing stroke, and wherein the intermediate portion is sloped relative to the firing path.

[0541] The surgical instrument of Example 70, wherein the first cam extends along a first longitudinal axis which is parallel to the firing path.

[0542] The surgical instrument of Examples 68, 69, 70, or 71, wherein the cartridge jaw comprises a replaceable staple cartridge including staples removably stored therein, and wherein the firing member is configured to eject the staples from the staple cartridge during a firing stroke.

[0543] The surgical instrument of Examples 68, 69, 70, or 71, wherein the first cam comprises a longitudinal ridge defined thereon which is configured to deform against the cartridge jaw during a firing stroke.

[0544] The surgical instrument of Examples 68, 69, 70, or 71, wherein the second cam comprises a longitudinal ridge defined thereon which is configured to deform against the anvil jaw during a firing stroke.

[0545] The surgical instrument of Examples 68, 69, 70, or 71, wherein the first cam comprises a longitudinal wear pad defined thereon which is configured to wear against the cartridge jaw during a firing stroke.

[0546] The surgical instrument of Examples 68, 69, 70, or 71, wherein the second cam comprises a longitudinal wear pad defined thereon which is configured to wear against the anvil jaw during a firing stroke.

[0547] A surgical system, comprising a firing member movable through a firing stroke, a first jaw, and a second jaw. The firing member comprises a first cam extending laterally from the firing member, and a second cam extending laterally from the firing member. The second cam comprises a leading projection comprising a leading projection end, and a trailing projection comprising a trailing projection end, wherein the leading projection end and the trailing projection end are not attached to one another. The first cam is configured to engage the first jaw during a firing stroke of the firing member, and the second cam is configured to engage the second jaw during a firing stroke of the firing member.

[0548] The surgical system of Example 77, wherein the first jaw is movable relative to the second jaw between an open position and a closed position.

[0549] The surgical system of Examples 77 or 78, wherein the second jaw is movable relative to the first jaw between an open position and a closed position.

[0550] The surgical system of Example 77, wherein the first jaw comprises a replaceable staple cartridge including staples removably stored therein, and wherein the second jaw comprises an anvil configured to deform the staples.

[0551] The surgical system of Example 77, wherein the second jaw comprises a replaceable staple cartridge including staples removably stored therein, and wherein the first jaw comprises an anvil configured to deform the staples.

[0552] The surgical system of Examples 77, 78, 79, 80, or 81, wherein the trailing projection is positioned closer to the first cam than the leading projection.

[0553] The surgical system of Examples 77, 78, 79, 80, 81, or 82, wherein the first cam comprises a longitudinal ridge defined thereon which is configured to deform against the first jaw during a firing stroke.

[0554] The surgical system of Examples 77, 78, 79, 80, 81, 82, or 83, wherein the first cam comprises a longitudinal wear pad defined thereon which is configured to wear against the first jaw during a firing stroke.

[0555] The surgical system of Examples 77, 78, 79, 80, 81, 82, 83, or 84, wherein the leading projection and the trailing projection are movable relative to one another.

[0556] The surgical system of Examples 77, 78, 79, 80, 81, 82, 83, 84, or 85, wherein the leading projection and the trailing projection extend to the same side of the firing member.

[0557] A surgical system, comprising a firing member movable through a firing stroke, a first jaw, and a second jaw. The firing member comprises a first cam extending laterally from the firing member, and a second cam extending laterally from the firing member. The second cam comprises a leading projection comprising a leading projection end, and a trailing projection comprising a trailing projection end, wherein the leading projection end and the trailing projection end are movable relative to one another. The first cam is configured to engage the first jaw during a firing stroke of the firing member, and the second cam is configured to engage the second jaw during a firing stroke of the firing member.

[0558] A surgical system, comprising a firing member movable through a firing stroke, a first jaw, and a second jaw. The firing member comprises a first cam extending laterally from the firing member, and a second cam extending laterally from the firing member. The second cam comprises a longitudinal ridge defined thereon which is configured to deform against the second jaw during a firing stroke. The first cam is configured to engage the first jaw during a firing stroke of the firing member, and the second cam is configured to engage the second jaw during a firing stroke of the firing member.

[0559] Many of the surgical instrument systems described herein are motivated by an electric motor; however, the surgical instrument systems described herein can be motivated in any suitable manner. In various instances, the surgical instrument systems described herein can be motivated by a manually-operated trigger, for example. In certain instances, the motors disclosed herein may comprise a portion or portions of a robotically controlled system. Moreover, any of the end effectors and/or tool assemblies disclosed herein can be utilized with a robotic surgical instrument system. U.S. patent application Ser. No. 13/118,241, entitled SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS, now U.S. Pat. No. 9,072,535, for example, discloses several examples of a robotic surgical instrument system in greater detail.

[0560] The surgical instrument systems described herein have been described in connection with the deployment and deformation of staples; however, the embodiments described herein are not so limited. Various embodiments are envisioned which deploy fasteners other than staples, such as clamps or tacks, for example. Moreover, various embodiments are envisioned which utilize any suitable means for sealing tissue. For instance, an end effector in accordance with various embodiments can comprise electrodes configured to heat and seal the tissue. Also, for instance, an end effector in accordance with certain embodiments can apply vibrational energy to seal the tissue.

[0561] The entire disclosures of:

[0562] U.S. Pat. No. 5,403,312, entitled ELECTROSURGICAL HEMOSTATIC DEVICE, which issued on Apr. 4, 1995;

[0563] U.S. Pat. No. 7,000,818, entitled SURGICAL STAPLING INSTRUMENT HAVING SEPARATE DISTINCT CLOSING AND FIRING SYSTEMS, which issued on Feb. 21, 2006;

[0564] U.S. Pat. No. 7,422,139, entitled MOTOR-DRIVEN SURGICAL CUTTING AND FASTENING INSTRUMENT WITH TACTILE POSITION FEEDBACK, which issued on Sep. 9, 2008;

[0565] U.S. Pat. No. 7,464,849, entitled ELECTRO-MECHANICAL SURGICAL INSTRUMENT WITH CLOSURE SYSTEM AND ANVIL ALIGNMENT COMPONENTS, which issued on Dec. 16, 2008;

[0566] U.S. Pat. No. 7,670,334, entitled SURGICAL INSTRUMENT HAVING AN ARTICULATING END EFFECTOR, which issued on Mar. 2, 2010;

[0567] U.S. Pat. No. 7,753,245, entitled SURGICAL STAPLING INSTRUMENTS, which issued on Jul. 13, 2010;

[0568] U.S. Pat. No. 8,393,514, entitled SELECTIVELY ORIENTABLE IMPLANTABLE FASTENER CARTRIDGE, which issued on Mar. 12, 2013;

[0569] U.S. patent application Ser. No. 11/343,803, entitled SURGICAL INSTRUMENT HAVING RECORDING CAPABILITIES; now U.S. Pat. No. 7,845,537;

[0570] U.S. patent application Ser. No. 12/031,573, entitled SURGICAL CUTTING AND FASTENING INSTRUMENT HAVING RF ELECTRODES, filed Feb. 14, 2008;

[0571] U.S. patent application Ser. No. 12/031,873, entitled END EFFECTORS FOR A SURGICAL CUTTING AND STAPLING INSTRUMENT, filed Feb. 15, 2008, now U.S. Pat. No. 7,980,443;

[0572] U.S. patent application Ser. No. 12/235,782, entitled MOTOR-DRIVEN SURGICAL CUTTING INSTRUMENT, now U.S. Pat. No. 8,210,411;

[0573] U.S. patent application Ser. No. 12/249,117, entitled POWERED SURGICAL CUTTING AND STAPLING APPARATUS WITH MANUALLY RETRACTABLE FIRING SYSTEM, now U.S. Pat. No. 8,608,045;

[0574] U.S. patent application Ser. No. 12/647,100, entitled MOTOR-DRIVEN SURGICAL CUTTING INSTRUMENT WITH ELECTRIC ACTUATOR DIRECTIONAL CONTROL ASSEMBLY, filed Dec. 24, 2009; now U.S. Pat. No. 8,220,688;

[0575] U.S. patent application Ser. No. 12/893,461, entitled STAPLE CARTRIDGE, filed Sep. 29, 2012, now U.S. Pat. No. 8,733,613;

[0576] U.S. patent application Ser. No. 13/036,647, entitled SURGICAL STAPLING INSTRUMENT, filed Feb. 28, 2011, now U.S. Pat. No. 8,561,870;

[0577] U.S. patent application Ser. No. 13/118,241, entitled SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS, now U.S. Pat. No. 9,072,535;

[0578] U.S. patent application Ser. No. 13/524,049, entitled ARTICULATABLE SURGICAL INSTRUMENT COMPRISING A FIRING DRIVE, filed on Jun. 15, 2012; now U.S. Pat. No. 9,101,358;

[0579] U.S. patent application Ser. No. 13/800,025, entitled STAPLE CARTRIDGE TISSUE THICKNESS SENSOR SYSTEM, filed on Mar. 13, 2013, now U.S. Pat. No. 9,345,481;

[0580] U.S. patent application Ser. No. 13/800,067, entitled STAPLE CARTRIDGE TISSUE THICKNESS SENSOR SYSTEM, filed on Mar. 13, 2013, now U.S. Patent Application Publication No. 2014/0263552;

[0581] U.S. Patent Application Publication No. 2007/0175955, entitled SURGICAL CUTTING AND FASTENING INSTRUMENT WITH CLOSURE TRIGGER LOCKING MECHANISM, filed Jan. 31, 2006; and

[0582] U.S. Patent Application Publication No. 2010/0264194, entitled SURGICAL STAPLING INSTRUMENT WITH AN ARTICULATABLE END EFFECTOR, filed Apr. 22, 2010, now U.S. Pat. No. 8,308,040, are hereby incorporated by reference herein.

[0583] Although various devices have been described herein in connection with certain embodiments, modifications and variations to those embodiments may be implemented. Particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, the particular features, structures, or characteristics illustrated or described in connection with one embodiment may be combined in whole or in part, with the features, structures or characteristics of one ore more other embodiments without limitation. Also, where materials are disclosed for certain components, other materials may be used. Furthermore, according to various embodiments, a single component may be replaced by multiple components, and multiple components may be replaced by a single component, to perform a given function or functions. The foregoing description and following claims are intended to cover all such modification and variations.

[0584] The devices disclosed herein can be designed to be disposed of after a single use, or they can be designed to be used multiple times. In either case, however, a device can be reconditioned for reuse after at least one use. Reconditioning can include any combination of the steps including, but not limited to, the disassembly of the device, followed by cleaning or replacement of particular pieces of the device, and subsequent reassembly of the device. In particular, a reconditioning facility and/or surgical team can disassemble a device and, after cleaning and/or replacing particular parts of the device, the device can be reassembled for subsequent use. Those skilled in the art will appreciate that reconditioning of a device can utilize a variety of techniques for disassembly, cleaning/replacement, and reassembly. Use of such techniques, and the resulting reconditioned device, are all within the scope of the present application.

[0585] The devices disclosed herein may be processed before surgery. First, a new or used instrument may be obtained and, when necessary, cleaned. The instrument may then be sterilized. In one sterilization technique, the instrument is placed in a closed and sealed container, such as a plastic or TYVEK bag. The container and instrument may then be placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, and/or high-energy electrons. The radiation may kill bacteria on the instrument and in the container. The sterilized instrument may then be stored in the sterile container. The sealed container may keep the instrument sterile until it is opened in a medical facility. A device may also be sterilized using any other technique known in the art, including but not limited to beta radiation, gamma radiation, ethylene oxide, plasma peroxide, and/or steam.

[0586] While this invention has been described as having exemplary designs, the present invention may be further modified within the spirit and scope of the disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles.

[0587] Any patent, publication, or other disclosure material, in whole or in part, that is said to be incorporated by reference herein is incorporated herein only to the extent that the incorporated materials do not conflict with existing definitions, statements, or other disclosure material set forth in this disclosure. As such, and to the extent necessary, the disclosure as explicitly set forth herein supersedes any conflicting material incorporated herein by reference. Any material, or portion thereof, that is said to be incorporated by reference herein, but which conflicts with existing definitions, statements, or other disclosure material set forth herein will only be incorporated to the extent that no conflict arises between that incorporated material and the existing disclosure material.