US 9,011,465 B2Grant
Endoscopic surgical clip applier
Issue Date:2015-04-21
•10 Claims
•45 Drawing Sheets
Abstract
An apparatus for application of surgical clips to body tissue includes a jaw assembly mounted adjacent a distal end portion of a body, the jaw assembly including first and second jaw portions movable between a spaced-apart and an approximated position; a yoke slidably supported at least partially in a handle portion and being connected to at least one trigger; a drive link slidably supported at least partially in the handle portion and the body, the drive link having a proximal end connected to the yoke; a spindle supported in the body and rotatably connected to the drive link; and a jaw closure member connected to a distal end of the spindle and being positioned adjacent the first and second jaw portions to move the jaw portions to the approximated position upon a squeezing of the at least one trigger which results in distal advancement of the jaw closure member.
Metadata
Assignee
- Covidien LP
Inventors
- Kenneth H. Whitfield
- Greg Sorrentino
Application Information
Application Number:US 13/721,171
Filing Date:2012-12-20
Priority Date:2004-10-08
Art Unit:3731
Classifications
IPC:
A61B17/10A61B17/128A61B17/00A61B17/29A61B19/00
Patent Drawings (45 sheets)
Description
Cross Reference to Related Patent Applications
[0001] The instant patent application is a Continuation of U.S. patent application Ser. No. 12/764,226, filed on Apr. 21, 2010 (now U.S. Pat. No. 8,357,171), which is a Divisional of U.S. patent application Ser. No. 11/245,493, filed on Oct. 7, 2005 (now U.S. Pat. No. 7,717,926), which claims priority to each of U.S. Provisional Patent Application Ser. No. 60/617,104, filed on Oct. 8, 2004, and U.S. Provisional Patent Application Ser. No. 60/617,016, filed on Oct. 8, 2004, each of which are herein incorporated by reference in their entirety.
Technical Field
[0002] The technical field relates to surgical clip appliers and more particularly to an endoscopic surgical clip applier having a mechanism for stabilizing the jaw structure during the insertion of a surgical clip.
Description of the Related Art
[0003] Endoscopic staplers and clip appliers are known in the art and are used for a number of distinct and useful surgical procedures. In the case of a laparoscopic surgical procedure, access to the interior of an abdomen is achieved through narrow tubes or cannulas inserted through a small entrance incision in the skin. Minimally invasive procedures performed elsewhere in the body are often generally referred to as endoscopic procedures. Typically, a tube or cannula device is extended into the patient's body through the entrance incision to provide an access port. The port allows the surgeon to insert a number of different surgical instruments therethrough using a trocar and for performing surgical procedures far removed from the incision.
[0004] During a majority of these procedures, the surgeon must often terminate the flow of blood or another fluid through one or more vessels. The surgeon will often apply a surgical clip to a blood vessel or another duct to prevent the flow of body fluids therethrough during the procedure. An endoscopic clip applier is known in the art for applying a single clip during an entry to the body cavity. Such single clip appliers are typically fabricated from a biocompatible material and are usually compressed over a vessel. Once applied to the vessel, the compressed clip terminates the flow of fluid therethrough.
[0005] One significant design goal is that the surgical clip be loaded between the jaws without any compression of the clip from the loading procedure. Such bending or torque of the clip during loading is disfavored and care is exercised to prevent any damage to the jaws and/or the clip or compression to the clip by a force during loading. This compression could slightly alter the alignment of the clip between the jaws, or damage the clip causing the surgeon to remove the clip from between the jaws for discarding the clip. Additionally such preloading compression may slight compress parts of the clip and change the geometry of the clip. This will cause the surgeon to remove the compressed clip from between the jaws for discarding the clip. Accordingly, there is a need for an apparatus that eliminates one or more of the aforementioned drawbacks and deficiencies of the art.
Summary
[0006] According to a first aspect of the present disclosure, there is provided an apparatus for application of surgical clips to body tissue. The apparatus has a handle portion with a body extending distally from the handle portion defining a longitudinal axis and a plurality of surgical clips disposed within the body. The apparatus also has a jaw assembly mounted adjacent a distal end portion of the body with the jaw assembly including first and second jaw portions movable between a spaced-apart and an approximated position. The apparatus further has a wedge plate longitudinally movable between the first and the second jaw portions, and a clip pusher configured to individually distally advance a surgical clip to the jaw assembly while the jaw portions are in the spaced apart position with an actuator. The actuator is at least partially disposed within the body and longitudinally movable in response to actuation of the handle portion and has a cam link. The apparatus also has a jaw closure member positioned adjacent the first and second jaw portions to move the jaw portions to the approximated position. The cam link longitudinally moves wedge plate between the first and the second jaw portions.
[0007] According to another aspect of the present disclosure, the apparatus has the wedge plate biasing the first and the second jaw portions when said wedge plate is longitudinally moved between the first and the second jaw portions and the wedge plate maintains the first and the second jaw portions in a fixed predetermined relationship during loading of the clip. The fixed predetermined relationship prevents flexing of the first and the second jaw members during clip loading.
[0008] According to another aspect of the present disclosure, the apparatus has the wedge plate with a rounded distal tip.
[0009] According to another aspect of the present disclosure, the apparatus has the wedge plate with a first proximal window. The first proximal window is adapted to be engaged by a member disposed in the body with the member being configured to hold the wedge plate in a distal most position. The distal most position being between the first and the second jaw members.
[0010] According to another aspect of the present disclosure, the apparatus has the wedge plate with a second proximal window. The second proximal window is adapted to be engaged by the member and the second proximal window is configured to hold the wedge plate in a proximal most position retracted from the first and the second jaw members. The proximal most position of the wedge plate is configured to allow the first and the second jaw members to be moved to the approximated position to compress the clip.
[0011] According to another aspect of the present disclosure, the apparatus has the first proximal window connected to the second proximal window by a longitudinal slot.
[0012] According to another aspect of the present disclosure, the apparatus has the member movable from the second proximal window to first proximal window by moving the wedge plate distally.
[0013] According to still another aspect of the present disclosure, the apparatus has the cam link engageable with a cam slot in the wedge plate. The cam slot has a driving edge.
[0014] According to another aspect of the present disclosure, the member is a flexible leg.
[0015] According to another aspect of the present disclosure, the apparatus has the cam slot with a proximal side and a distal side. At the distal side, the cam link traverses past the driving edge at a demarcation line. At the demarcation line, the cam link terminates distal movement of the wedge plate.
[0016] According to another aspect of the present disclosure, the apparatus has the wedge plate further comprising a biasing device. At the demarcation line, the disengagement between the cam link and the driving edge permits the biasing device to retract the wedge plate.
[0017] According to another aspect of the present disclosure, the cam link disengages the wedge plate at the demarcation line, and the disengagement of the cam link permits retraction of the rounded distal end from between the first and the second jaw members.
[0018] According to another aspect of the present disclosure, there is provided an apparatus for application of surgical clips to body tissue. The apparatus has a handle portion and a body extending distally from the handle portion and defining a longitudinal axis with a plurality of surgical clips disposed within the body and a jaw assembly mounted adjacent a distal end portion of the body. The jaw assembly has first and second jaw portions movable between a spaced-apart and an approximated position. The apparatus also has a clip pusher configured to individually distally advance a surgical clip to the jaw assembly while the jaw portions are in the spaced apart position and an actuator at least partially disposed within the body and longitudinally movable in response to actuation of the handle portion. The actuator is biased to longitudinally move proximally. The apparatus also has a jaw closure member positioned adjacent the first and second jaw portions to move the jaw portions to the approximated position and a rack having a plurality of ratchet teeth being connected to the actuator with a pawl biased to the handle portion. The pawl has at least one tooth configured to engage the ratchet teeth. As the actuator is moved longitudinally, the plurality of ratchet teeth are passed over the pawl and the pawl is configured to prevent inadvertent return of the actuator before full actuation of the apparatus.
[0019] According to another aspect of the present disclosure, the pawl is biased by a spring and the spring is connected to the handle portion to bias the pawl into engagement with the rack.
[0020] According to another aspect of the present disclosure, the apparatus has the pawl is pivotally mounted in the handle portion.
[0021] According to another aspect of the present disclosure, when actuation of the handle portion is terminated in mid stroke, the ratchet teeth restrain the pawl against proximal motion, and any inadvertent partial actuation of the jaw assembly is prevented.
[0022] According to another aspect of the present disclosure, the apparatus has the first jaw and second portions moved to the approximated position and the ratchet teeth are advanced a predetermined distance past the pawl to permit retraction of the actuator.
[0023] According to another aspect of the present disclosure, there is provided an apparatus for application of surgical clips to body tissue. The apparatus has a handle assembly with a handle and a trigger movable relative to the handle, and a body extending distally from the handle portion and defining a longitudinal axis. The apparatus also has a plurality of surgical clips disposed within the body and a jaw assembly mounted adjacent a distal end portion of the body with the jaw assembly including first and second jaw portions movable between a spaced-apart and an approximated position. The apparatus further has a clip pusher configured to individually distally advance a surgical clip to the jaw assembly while the jaw portions are in the spaced-apart position and an actuator at least partially disposed within the body and longitudinally movable in response to actuation of the handle portion. The apparatus also has a link connected at a first end to the actuator and connected at a second end to the trigger with a jaw closure member positioned adjacent the first and second jaw portions to move the jaw portions to the approximated position.
[0024] According to another aspect of the present disclosure, the link is connected to a rack having a plurality of ratchet teeth and the ratchet teeth are connected to a pawl and are configured to prevent inadvertent return of the actuator before full actuation of the apparatus.
[0025] According to another aspect of the present disclosure, the apparatus has the pawl biased to the handle. As the trigger is actuated the link is advanced distally and the link advances the rack distally. The pawl ratchet teeth slide along the pawl.
[0026] According to another aspect of the present disclosure, the apparatus has the pawl is pivotally connected to the handle.
Brief Description of the Drawings
[0027] A particular embodiment of a surgical clip applier is disclosed herein with reference to the drawings wherein;
[0028] FIG. 1 is a perspective view of a surgical clip applier;
[0029] FIG. 2 is another perspective view of the surgical clip applier of FIG. 1 ;
[0030] FIG. 3 is an enlarged perspective view of the jaw structure of the surgical clip applier;
[0031] FIG. 4 is a top view of the surgical clip applier;
[0032] FIG. 5 is a side view of the surgical clip applier;
[0033] FIG. 6 is a side view, with half of the body removed, of the handle assembly of the surgical clip applier;
[0034] FIG. 7 is an exploded perspective view of the handle of the clip applier, with shaft assembly;
[0035] FIG. 8 is a perspective view of a pawl;
[0036] FIG. 9 is a perspective view of a yoke;
[0037] FIG. 10 is an exploded perspective view of the shaft assembly of the surgical clip applier;
[0038] FIG. 10A is a perspective view of a feed bar;
[0039] FIG. 10B is a perspective view of a follower and surgical clips;
[0040] FIGS. 10C and 10D are opposite perspective views of a trip block;
[0041] FIG. 10E is a perspective view of a spindle;
[0042] FIG. 10G is an enlarged area of detail of FIG. 10E ;
[0043] FIG. 10F is an enlarged area of detail of FIG. 10E ;
[0044] FIG. 11 is a perspective view of the distal end of the spindle and a driver;
[0045] FIG. 12 is a perspective view of a trip lever mechanism on the spindle;
[0046] FIG. 13 is a perspective view of a wedge plate and biasing spring;
[0047] FIGS. 14 and 15 are opposite perspective views of a filler component;
[0048] FIG. 16 is a perspective view of the rotation knob and shaft assembly;
[0049] FIG. 17 is a perspective view of the overpressure assembly;
[0050] FIG. 18 is a perspective view of the spindle and jaw assembly;
[0051] FIG. 19 is an enlarged area of detail of the spindle and jaw assembly of FIG. 18 ;
[0052] FIG. 20 is an enlarged area of detail of the spindle and trip lever of FIG. 18 ;
[0053] FIG. 21 is an enlarged view of the distal end of the surgical clip applier with outer tube removed;
[0054] FIG. 22 is a perspective view of the surgical clip applier shaft assembly with parts removed;
[0055] FIG. 23 is an enlarged area at detail of FIG. 22 ;
[0056] FIG. 24 is an enlarged area of detail of FIG. 22 ;
[0057] FIG. 25 is an enlarged area of detail of FIG. 22 ;
[0058] FIG. 26 is a perspective view of the spindle, driver and jaw assembly;
[0059] FIG. 27 is an enlarged area of detail of FIG. 26 ;
[0060] FIG. 27A is a cross-sectional view taken along line 27A-27A of FIG. 27 .
[0061] FIG. 28 is a perspective view of the cam link and wedge plate assembly;
[0062] FIG. 29 is an enlarged area of detail of FIG. 28 ;
[0063] FIG. 30 is an enlarged area of detail of FIG. 29 ;
[0064] FIG. 31 is a perspective view of the filler component and jaw assembly;
[0065] FIG. 32 is an enlarged perspective view of the jaw assembly of FIG. 31 ;
[0066] FIGS. 33 and 34 are perspective views of the distal end of the spindle including wedge plate and driver;
[0067] FIG. 35 is a side view, partially shown in section, of the surgical clip applier in a pre-fired condition;
[0068] FIG. 36 is in enlarged area of detail of FIG. 35 ;
[0069] FIG. 37 is an enlarged area of detail of FIG. 35 ;
[0070] FIG. 38 is in enlarged area of detail of FIG. 37 showing the trip lever;
[0071] FIG. 39 is an enlarged area of detail of FIG. 37 showing the follower;
[0072] FIG. 40 is an enlarged the area of detail of FIG. 37 ;
[0073] FIG. 41 is enlarged area of detail of FIG. 40 ;
[0074] FIG. 42 is a side view, shown in section, of the distal end of the surgical clip applier of FIG. 37 ;
[0075] FIG. 43 is a perspective view of the wedge plate and jaw assembly;
[0076] FIG. 44 is an enlarged area of detail of FIG. 43 showing the wedge plate and jaw members;
[0077] FIG. 45 is a top view of FIG. 43 taken along line 45-45;
[0078] FIG. 46 is an enlarged area of detail of FIG. 45 showing the jaw and the wedge plate;
[0079] FIG. 47 is an enlarged area of detail of FIG. 45 showing the wedge plate and cam link;
[0080] FIG. 48 is a side view, shown in section, of the handle housing at the beginning of an initial stroke;
[0081] FIG. 49 is an enlarged area of detail of FIG. 48 showing the rack and pawl;
[0082] FIG. 50 is an enlarged area of detail of FIG. 48 similar to FIG. 49 ;
[0083] FIG. 51 is a side view, shown in section, of the feed bar and trip lever;
[0084] FIG. 52 is a side view, shown in section, of the follower;
[0085] FIG. 53 is a side view, shown in section, of the endoscopic portion of the surgical clip applier;
[0086] FIG. 54 is an enlarged area of detail of FIG. 53 illustrating the spindle movement;
[0087] FIG. 55 is a top view of the wedge plate and filler component illustrating the movement of the cam link;
[0088] FIG. 56 is a side view, shown in section, illustrating the feed bar advancing a clip;
[0089] FIG. 57 is a top view of the wedge plate and cam link moving distally;
[0090] FIG. 58 is a side view, shown in section, showing the movement of the flexible leg cammed out of a wedge plate window;
[0091] FIG. 59 is a side view, shown in section, illustrating a clip entering the jaws;
[0092] FIG. 60 is a further top view of the cam link and wedge plate movement;
[0093] FIG. 61 is a side view, shown in section, of the flexible leg and wedge plate disengagement;
[0094] FIG. 62 is a top view of the wedge plate entering the jaw structure;
[0095] FIG. 63 is a perspective view illustrating the wedge plate camming open the jaw structure;
[0096] FIG. 64 is a top view illustrating further advancement of the cam link in the wedge plate;
[0097] FIG. 65 is a side view, shown in section, illustrating the trip lever engaged with the feed bar;
[0098] FIG. 66 is a side view, shown in section, illustrating the spindle camming the flexible leg out of engagement with the wedge plate;
[0099] FIG. 67 is a side view, shown in section, illustrating the feed bar loading a clip into the jaw structure;
[0100] FIG. 68 is a side view, shown in section, illustrating the trip lever being cammed out of engagement with the feed bar by means of a trip block;
[0101] FIG. 69 is a side view, shown in section, illustrating the retraction of the wedge plate and feed bar;
[0102] FIG. 70 is a side view, shown in section, illustrating further advancement of the spindle;
[0103] FIG. 71 is a side view, shown in section, illustrating the retraction of the wedge plate and further advancement of the spindle;
[0104] FIG. 72 is a perspective view of the wedge plate retracting from the jaw structure;
[0105] FIG. 73 is a side view, shown in section, with the spindle engaging the driver and a latch retractor engaging the spindle;
[0106] FIG. 74 is a side view of the handle housing with the trigger at full stroke;
[0107] FIG. 75 is an enlarged area of detail of FIG. 74 with the pawl clearing the ratchet rack;
[0108] FIG. 76 is a side view, shown in section, of the driver camming the jaws closed about a surgical clip;
[0109] FIGS. 77 to 79 are sequential views of the driver camming the jaws closed about a surgical clip;
[0110] FIG. 80 is a view, shown in section, of the overpressure mechanism including the impact spring;
[0111] FIG. 81 is a perspective view of a surgical clip formed on a vessel;
[0112] FIG. 82 is an enlarged area of detail of the ratchet mechanism resetting;
[0113] FIG. 83 is a side view, shown in section, illustrating the latch retractor resetting;
[0114] FIG. 84 is a side view, shown in section, illustrating the spindle retracting; and
[0115] FIGS. 85 and 86 are top views illustrating the cam link resetting within the wedge plate.
Detailed Description
[0116] There is disclosed a novel endoscopic surgical clip applier having a jaw control mechanism configured to maintain jaws of the surgical clip applier in a spaced apart and stable position during insertion of a surgical clip. It should be noted that, while the disclosed jaw control mechanism is shown and described in an endoscopic surgical clip applier, the disclosed jaw control mechanism is applicable to any surgical clip applier or other instrument having a pair of compressible jaws.
[0117] Referring now to FIGS. 1-5 , surgical clip applier 10 generally includes a handle assembly 12 and an endoscopic portion including an elongated tubular member 14 extending distally from handle assembly 12. Handle assembly 12 is formed of a plastic material while elongated tubular member 14 is formed of a biocompatible material such as stainless steel. A pair of jaws 16 are mounted on the distal end of elongated tubular member 14 and are actuated by a trigger 18 movably mounted in handle assembly 12. Jaws 16 are also formed of a biocompatible material such as stainless steel or titanium. A knob 20 is rotatably mounted on a distal end of handle assembly 12 and affixed to elongated tubular member 14 to provide 360 degree rotation of elongated tubular member 14 and jaws 16 about its longitudinal axis. Referring for the moment to FIG. 3 , jaws 16 define a channel 22 for receipt of a surgical clip therein.
[0118] Referring now to FIGS. 6 and 7 , handle assembly 12 of clip applier 10 is shown. Handle assembly 12 includes a longitudinally movable yoke 24 connected to trigger 18 by a link 26. Handle assembly 12 includes housing channels 28 to guide yoke wings 30 of yoke 24 within handle assembly 12 during actuation of clip applier 10. Yoke 24 is connected to the drive mechanisms and is biased to a proximal position by a return spring 32. Knob 20 includes a flange 34 which is rotatably mounted in a journal 36 in housing 12.
[0119] Referring to FIGS. 6-9 , in order to prevent inadvertent return of trigger 18 and yoke 24 before full actuation of surgical instrument 10, yoke 24 includes a rack 38 having rack teeth 40. A pawl 42 is pivotally mounted in handle assembly 12 and includes pawl teeth 44 engageable with rack teeth 40. Pawl 42 is biased into engagement with rack 38 by a spring 46. Rack 38 and pawl 42 prevent release of trigger 18 before full actuation in a manner described in more detail hereinbelow.
[0120] Combinations of the various elements and mechanisms associated with clip applier 10 will now be described.
[0121] Referring to FIG. 10 , a bushing 48, including retention pins 50, is provided to secure the bushing 48 to the knob 20. A drive link 52 is connected, typically with a snap type connection, to yoke 24 such that a proximal end of drive link 52 engages yoke 24. An over pressure mechanism including an impact spring 56 is provided about outer tube 14, between bushing 48 and housed in a bore of knob 20 to prevent over compression of jaws 16 during actuation of the instrument in a manner described in more detail hereinbelow. Drive link 52 extends through a bore 58 in knob 20.
[0122] A flange located at a proximal end of elongated tube member 14 abuts a proximal end of bushing 48.
[0123] In order to actuate the various components there is provided an actuation mechanism or spindle 60 mounted for longitudinal movement through elongated tubular member 14. Spindle 60 includes a boss 62 at its proximal end which is engageable with a recess 64 on the distal end of drive link 52. A camming mechanism including a driver 66 and a slider joint 68 extend from a distal end of spindle 60 to cam closed jaws 16 about a surgical clip.
[0124] Clip applier 10 is configured to retain a plurality of surgical clips for application to tissue. Clip applier 10 includes an elongated channel member 70 configured to retain a plurality of surgical clips 72 and convey surgical clips 72 to jaws 16. It should be noted that channel member 70 and jaws 16 do not move longitudinally relative to elongated tubular member 14. A follower 74 is biased by a spring 76 to urge surgical clips 72 distally within channel member 70. A channel cover 78 overlies channel 70 to retain and guide spring 76 and surgical clips 72 therein. A nose 80 is provided at a distal end of channel cover 78 to assist in directing surgical clips 72 into jaws 16.
[0125] A feeder mechanism including a feed bar 82 is provided for longitudinal movement relative to channel cover 78 in order to advance individual clips 72 into jaws 16. A trip block 84 having a guide pin 86 and a feed bar spring 88 are provided adjacent the proximal end of channel cover 78 to bias feed bar 82 in a proximal direction. Specifically, a proximal end 90 of guide pin 86 is interconnected with a hook 92 on an underside of feed bar 82 (FIGS. 38A & B) and through slot 94 in trip block 84. (See also FIGS. 10 A, C, & D) In order for spindle 60 to move feed bar 82, spindle 60 is provided with a trip lever 96 and a biasing spring 98. Trip lever 96 is engageable with a proximal end of feed bar 82 in a manner described in more detail herein below.
[0126] A notable advantage of presently disclosed clip applier 10 is that it is provided with a wedge plate 100 which is configured to advance into jaws 16 during actuation of surgical clip applier 10 and maintain jaws 16 in a spaced apart condition while receiving a surgical clip 72. Cam slot 136 (FIG. 13 ), described in detail hereinbelow, formed through wedge plate 100 and a filler component 102 mounted within elongated tubular member 14, cooperate in connection with a cam link 104, provided on spindle 60, to move wedge plate 100 relative to filler component 102 and jaws 16. Filler component 102 is positioned directly behind jaws 16 and does not move relative to elongated tubular member 14.
[0127] Turning to FIG. 10A , and as noted above, feed bar 82 is provided to move surgical clips 72 into jaws 16. Feed bar 82 is driven by trip lever 96 on spindle 60. (See FIG. 10 .) Specifically, feed bar 82 is provided with an elongated window 106 which is configured to be engaged by trip lever 96 as spindle 60 is driven distally. To facilitate insertion of the clip into jaws 16, feed bar 82 is provided with a pusher 108 at its distal end which is configured to advance an individual clip 72 out of the line of clips 72 and into jaws 16. As shown in FIG. 10B , follower 74 is positioned behind the line of clips to advance clips 72 through surgical clip applier 10.
[0128] Referring to FIG. 10C , as noted above, trip block 84 includes a slot 94 to receive hook 92 of feed bar 82. In order to disengage trip lever 96 from window 106 and thus feed bar 82, trip block 84 is provided with an angled surfaces 110 which is configured to engage trip lever 96 and disengage it from window 106 of feed bar 82 as best shown in FIG. 10D .
[0129] Referring now to FIGS. 10E-10G , various features of spindle 60 will now be described. A perspective view of spindle 60, isolated from other components is shown in FIG. 10E . With specific reference to FIG. 10F , at a proximal end, spindle 60 includes a pivot point 112 for attachment of trip lever 96 at its proximal end. Additionally, a boss 114 is provided in spindle 60 for attachment of biasing spring 98 to bias trip lever 96 into engagement with window 106 of feed bar 82. Similarly, with respect to FIG. 10G , at a distal end, spindle 60 is provided with a boss 116 for mounting cam link 104. Spindle 60 is additionally provided with a raised feature 118 which functions to disengage filler component 102 from wedge plate 100 in a manner described in hereinbelow.
[0130] Referring to FIG. 11 , spindle 60 is provided to advance driver 66 into engagement with jaws 16 to close jaws 16 about a surgical clip after the surgical clip has been positioned within jaws 16. A distal end 120 of slider joint 68 resides in a recess 122 in driver 66. A proximal projection 124 of slider joint 68 rides within a longitudinal slot 126 in the distal end of spindle 60. The length of longitudinal slot 126 allows spindle 60 to move a predetermined longitudinal distance before engaging and moving driver 66 longitudinally to close jaws 16 about a clip 72. A latch retractor 128 is provided within a slot 130 in slider joint 68 so as to allow driver 66 to be driven distally after wedge plate 100 has been allowed to retract proximally in a manner described in more detail hereinbelow. A spindle guard 132 is provided between latch retractor 128 and the surface of spindle 60 to prevent damage to the plastic surface of spindle 60 by the surface of latch retractor 128.
[0131] Referring now to FIG. 13 , wedge plate 100 will be described in more detail. As noted above, wedge plate 100 is provided to maintain jaws 16 in a spaced apart condition during loading of a surgical clip 72 within jaws 16. Additionally, the presence of wedge plate 100 provides stability to jaws 16 to prevent them from flexing during loading of surgical clip 72. As shown, wedge plate 100 includes a distal tip 134 which is configured to engage and cam jaws 16 open and maintain them in a spaced condition. Additionally, wedge plate 100 includes a cam slot 136 which is configured to cooperate with cam link 104 mounted on spindle 60 to control the motions of wedge plate 100 as discussed in more detail below. Further, distal and proximal windows 138 and 140, respectively, are provided to engage flexible structure on the filler component 102. A biasing spring 142 is provided on a mount 144 to bias wedge plate 100 generally proximally within elongated tubular member 14. Finally, a stop 146 is configured to engage corresponding structure on filler component 102.
[0132] Referring now to FIGS. 14 and 15 , various aspects of filler component 102 will now be described. Filler component 102 includes a flexible leg 152 which is configured to engage distal and proximal windows 138 and 140 in wedge plate 100. Filler component 102 also includes an elongated cam slot 148 configured to receive part of cam link 104. A disengaging edge 150 is provided within cam slot 148 to facilitate disengaging cam link 104 from within cam slot 136 in wedge plate 100. Filler component 102 additionally includes a recess 154 for engagement with stop 146 on wedge plate 100 (FIG. 13 ), to limit the proximal retraction of wedge plate 100, as well as a longitudinal recess 156 to accommodate the length of return spring 142 of wedge plate 100.
[0133] FIGS. 16 and 17 illustrate the position of impact spring 56 relative to rotation knob 20. As noted above, impact spring 56 is provided as an over pressure mechanism to prevent over compression of jaws 16 during the crimping of a surgical clip 72 as described in more detail below with respect to the operation of surgical clip applier 10. The over pressure mechanism is designed to prevent overstroke of trigger 18 applied by the surgeon and ultimately prevent damage to jaws 16.
[0134] Referring to FIGS. 18-20 , spindle 60 and related drive components are shown with elongated tubular member 14 removed. Specifically, with regard to FIG. 19 , pusher 108 of feed bar 82 extends through a slot 158 in nose 80 to engage a surgical clip 72. Similarly, as shown in FIG. 20 , at a proximal end of spindle 60, trip lever 96 extends through window 106 in feed bar 82. In this position, trip lever 96 can engage an edge of slot 106 to drive feed bar 82 distally along with spindle 60 through elongated tubular member 14.
[0135] Referring to FIG. 21 , there is a view similar to FIG. 19 , however, nose 80 has been removed to illustrate pusher 108 engaging a surgical clip 72 located in channel 70.
[0136] Referring now to FIG. 22 , spindle 60 and associated components are shown with feed bar 82 removed.
[0137] Referring to FIG. 23 , there are illustrated multiple clips 72 positioned within channel 70 for supply to jaws 16 at a distal end of spindle 60. Clips 72 are arranged in longitudinal alignment within channel 70. Retention fingers 71 are provided at a distal end of channel 70 to restrain a stack of clips 72 within channel 70 until advanced into jaws 16 by feed bar 82.
[0138] Referring to FIG. 24 , there is illustrated an intermediate section of spindle 60 assembled with follower 74 and follower spring 76. As noted, spring 76 biases follower 74 distally relative to spindle 60.
[0139] With reference to FIG. 25 , there is illustrated spindle 60 assembled with trip lever 96 and biasing spring 98, with trip lever 96 being biased into a upward most position by biasing spring 98.
[0140] Referring to FIGS. 26 and 27 , an opposed side of spindle 60 assembled with driver 66 about jaws 16 is illustrated. As noted above, driver 66 is configured to cam jaws 16 closed about a surgical clip. Thus, jaws 16 include angled camming surfaces 160 for receipt of corresponding camming surfaces 184 (FIG. 34 ) of driver 66. A pocket 187 (FIG. 31 ) in the proximal end of jaws 16 limits the retraction of driver 66. Specifically, protrusion 186 of slider joint 68 engages pocket 187 of jaws 16. (See FIGS. 31 & 34 ).
[0141] Referring for the moment to FIG. 27A , camming surfaces 160 on jaws 16 and corresponding camming surfaces 184 of driver 66 are smoothly rounded, curved or radiused. By forming these camming surfaces in this manner, the friction between camming surfaces 160 and 184 is greatly reduced providing an improved smooth closure of jaws 16 about clip 72.
[0142] Referring to FIGS. 28-30 , the relative assembled positions of channel 70, trip lock 84, wedge plate 100 and filler component 102 will now be described. Referring initially to FIGS. 29 and 30 , filler component 102 is positioned on channel 70. Proximal end of filler component 102 abuts a stop 162 positioned on channel 70. The. wedge plate 100 lies over filler component 102 in the manner shown. As best shown in FIG. 30 , filler component 102 includes a cam slot 148 having a disengaging edge 150 formed within cam slot 148. Similarly, wedge plate 100 includes a cam slot 136. As noted above, a cam link 104 is provided attached to spindle 60 (not shown) in order to drive wedge plate 100 distally. To facilitate driving wedge plate 100, cam link 104 is provided with a cam link boss 164 which rides in cam slots 136 and 148 of wedge plate 100 and filler component 102 respectively. As cam link 104 is advanced distally relative to wedge plate 100 cam link boss 164 engages a driving edge 166 of wedge plate 100 to drive wedge plate 100 distally. In the manner described hereinafter, once cam link 104, and in particular cam link boss 164, engages disengaging edge 150 of filler component 102 cam link boss 164 is cammed out of engagement of driving edge 166.
[0143] Referring to FIG. 30 , filler component 102 is provided with a flexible leg 152 which is movable between distal and proximal windows 138, 140, respectively, of wedge plate 100. In order to cam flexible leg 152 out of one of the proximal or distal windows, there is provided a cam surface 168 on flexible leg 152 which cams flexible leg 152 out of the windows in response to relative movement of wedge plate 100 relative to filler component 102.
[0144] As noted hereinabove, jaws 16 are provided to receive and crimp surgical clips 72 positioned therein. Referring to FIGS. 31 and 32 , jaws 16 generally include a pair of flexible legs 170 fixed to a base 172. Jaw members 16A and 16B are located at a distal end of flexible legs 170. A pair of locking arms 174 extend distally from base 172 and terminate in tabs 176. Tabs 176 are configured to engage corresponding holes 177 on elongated tube 14 (FIG. 10 ) to secure jaws 16 to elongated tube 14. Jaws 16 include channel 22 for receipt of surgical clips 72. As shown, filler component 102 is positioned directly behind jaws 16 and, as with jaws 16, does not move longitudinally relative to outer tubular member 14.
[0145] Referring for the moment to FIG. 32 , jaws 16 are configured to receive wedge plate 100 such that the distal tip 134 of wedge plate 100 is used to initially separate jaws section 16a and 16b and maintain them in a separated and aligned configuration during insertion of a surgical clip into jaws 16. As noted, this prevents any torquing or flexing of jaw 16a relative to jaw 16b while a surgical clip 72 is being loaded therein. Each of flexible legs 170 includes a cam edge 178 (see FIGS. 44 & 63 ) to guide distal tip 134 of wedge plate 100 within jaws 16.
[0146] Referring to FIG. 33 , wedge plate 100 is illustrated positioned on spindle 60 such that latch retractor 128 extends through a slot 182 in wedge plate 100. As best shown in FIG. 34 , with wedge plate 100 removed, it can be seen that a distal end of driver 60 is provided with camming surfaces 184. Camming surfaces 184 cooperate with cam surfaces 160 on jaws 16, (see FIG. 27 ), to cam jaws 16 together in response to longitudinal movement of driver 60 relative to jaws 16. Protrusion 186 on slider joint 68 extends through a slot 188 in wedge plate 100 to limit retraction of slider joint 68 relative to jaws 16.
[0147] The operation of surgical clip applier 10 to crimp a surgical clip around a target tissue, such as, for example, a vessel, will now be described. With reference to FIGS. 35 and 36 , trigger 18 is in a generally uncompressed state with yoke 24 biased to a proximal-most position by return spring 32. As best shown in FIGS. 37-42 , and with initial reference to FIG. 38 , in an unfired state, trip lever 96 carried by spindle 60, biased upwardly by biasing spring 98, is positioned adjacent to, and in contact with, a slot in feed bar 82. Trip block 84 is in a distal position relative to trip lever 96.
[0148] Referring to FIG. 39 , follower 74 is biased distally by a spring 76 such that clips 72 are biased in a distal direction.
[0149] Referring to FIG. 40 , spindle 60 and feed bar 82 are stationery with latch retractor 128 biased to an upward position.
[0150] Referring to FIG. 41 , flexible leg 152 of filler component 102 is in the distal window 138 of wedge plate 100. Raised feature 118 on spindle 60 is proximal of flexible leg 152.
[0151] As best shown in FIG. 42 , at the distal end of surgical clip applier 10, when at rest in an unfired state, wedge plate 100 and feed bar 82 are in a proximal-most position relative to jaws 16.
[0152] FIGS. 43-47 illustrate the initial at rest position of the wedge plate 100, jaws 16 and filler component 102.
[0153] Referring initially to FIGS. 43 and 44 , as shown, wedge plate 100 is in a proximal-most position relative to jaws 16. As shown in FIG. 43 , flexible leg 152 is in distal window 138 of wedge plate 100, while cam link 104 is in a proximal-most position relative to cam slot 136 in wedge plate 100.
[0154] As best shown in FIGS. 45 and 46 , wedge plate 100 is in a proximal most position relative to jaws 16 with distal tip 134 proximal of cam edges 178 of jaws 16.
[0155] Referring to FIG. 47 , wedge plate 100 is in a proximal-most position relative to filler component 102, such that driving edge 166 of wedge plate 100 is proximal of disengaging edge 150 of filler component 102.
[0156] Referring to FIG. 48 , to initiate actuation of clip applier 10, trigger 18 is moved through an initial swing as shown by arrow A such that link 26 drives yoke 24 distally as shown by arrow B. As best shown in FIG. 49 , as yoke 24 is driven distally in the direction of arrow C, rack teeth 40 on rack 38 slide over pawl teeth 44 on pawl 42. With reference for the moment to FIG. 50 , if the trigger 18 is released at this point, rack teeth 40 would restrain pawl teeth 44 against proximal motion, preventing release of trigger 18 and partial or inadvertent partial actuation of surgical clip applier 10.
[0157] During the initial stroke, spindle 60 moves a predetermined distance. With regard to FIG. 51 , as spindle 60 is driven an initial distal distance, trip lever 96 engages elongated window 106 feed bar 82 and moves feed bar 82 distally a similar distance. As shown in FIGS. 42 & 51 , as feed bar 82 is driven distally and a clip 72 is driven into jaws 16, follower 74 moves distally (FIG. 52 ) due to the bias of spring 76 to urge the stack of surgical clips 72 distally.
[0158] Referring to FIGS. 53 and 54 , as spindle 60 and feed bar 82 move distally, spindle 60 drives cam link 104 distally an initial distance such that cam link boss 164 on cam link 104 engages wedge plate 100. As shown, flexible leg 152 of filler component 102 is positioned in distal-most window 138 of wedge plate 100.
[0159] As shown in FIG. 55 , as cam link 104 moves distally with spindle 60, cam link boss 164 engages driving edge 166 on wedge plate 100 to urge wedge plate 100 distally relative to filler component 102.
[0160] Referring to FIG. 56 , as feed bar 82 moves distally, pusher 108 at the distal end of feed bar 82 engages a clip 72 and begins to urge clip 72 into jaws 16. Notably, at this point, spindle 60 has not yet contacted driver 66, thereby preventing compression of jaws 16 prior to full insertion of surgical clip 72.
[0161] Turning again to FIG. 55 , as surgical clip applier 10 is actuated through a further second predetermined distance, cam boss 164 on cam link 104 continues to drive wedge plate 100 distally and flexible leg 152 is cammed out of distal window 138 and into proximal window 140 by cam surface 168 to engage wedge plate 100 with filler component 102. As shown in FIGS. 57 & 58 , at this point, feed bar 82, wedge plate 100, spindle 60, clips 72 and follower 74 (FIG. 52 ) are all moving in a distal-most direction.
[0162] Referring to FIG. 59 , feed bar 82 continues to urge pusher 108 at the distal end of feed bar 82 against a surgical clip 72 to urge clip 72 into channel 22 in jaws 16. Surgical clips 72 contained in channel 70 are biased in a distal direction by follower 74 (FIG. 52 ) and wedge plate 100 (FIG. 54 ) continues to move distally while driver 66 remains stationery relative to elongated tubular member 14.
[0163] Referring to FIG. 60 , as spindle 60 is moved further, cam boss 164 of cam link 104 is cammed out of engagement with driving edge 166 of wedge plate 100 by means of disengaging edge 150 formed in filler component 102 as best shown by the arrows in FIG. 60 . During this further stroke of a predetermined distance, flexible leg 152 of filler component 102 snaps into proximal window 140 of wedge plate 100, thereby preventing retraction of wedge plate 100 from its distal-most position.
[0164] As shown in FIG. 61 , flexible leg 152 is positioned within proximal window 140 of wedge plate 100, thereby restraining wedge plate 100 against retraction, while feed bar 82 and spindle 60 continue to move in a distal direction as shown by the arrows.
[0165] As shown in FIGS. 62-63 , distal tip 134 of wedge plate 100 urges jaw members 16a and 16b apart by engaging cam surfaces 178 in jaw members 16a and 16b. As noted above, by positioning wedge plate 100 in cam surfaces 178 of jaw members 16a and 16b, wedge plate 100 not only spreads the jaws 16 apart to properly receive surgical slip 72, but additionally restrains each individual jaw member 16a and 16b from flexing with respect to each other, thereby preventing any torque of clip 72 as it is being inserted into jaws 16.
[0166] Referring to FIG. 64 , as noted above, flexible leg 152 restrains wedge plate 100 from proximal retraction while cam link 104 continues to advance through slots 148 and 136 in filler component 102 (FIG. 64 ) and wedge plate 100.
[0167] As best shown in FIG. 65 , as spindle 60 continues to move distally through the stroke, trip lever 96 is urged distally with spindle 60 until trip lever 96 engages camming surface 110 (See FIG. 10D ) of trip block 84. As camming surface 110 of trip block 84 is urged against trip lever 96, trip lever 96 will be cammed out of engagement with elongated window 106 of feed bar 82 allowing feed bar 82 to return to a proximal position due to the bias of feed bar spring 88 (see FIG. 10 ).
[0168] Referring for the moment to FIG. 66 , as spindle 60 continues to move through its stroke, raised feature 118 on spindle 60 begins to cam flexible leg 152 out of proximal window 140 of wedge plate 100, so that the wedge plate 100 will be able to retract prior to, and so that, surgical clip 72 is crimped between jaws 16. This is best illustrated in FIG. 67 where feed bar 82 has fully inserted clip 72 within jaws 16 and wedge plate 100 has retracted to a proximal-most position.
[0169] FIG. 68 illustrates trip lever 96 being cammed out of engagement with feed bar 82 by camming surface 110 of trip block 84 and against the bias of biasing spring 98 such that feed bar 82 is disengaged from trip lever 96 and feed bar 82 can start to retract proximally. As shown, in FIG. 69 , pusher 108 of feed bar 82 is retracted to a proximal position behind the next distal most clip 72 as wedge plate 100 retracts leaving clip 72 inserted into jaws 16.
[0170] Referring to FIG. 70 , trip lever 96 is completely cammed down by cam surface 110 on trip block 84 and spindle 60 continues to move distally through a further predetermined stroke.
[0171] Referring for the moment to FIG. 71 , as wedge plate 100 retracts proximally while spindle 60 continues to move distally, flexible leg 152 on filler component 102 snaps into distal window 138 of wedge plate 100. As shown in FIG. 72 , wedge plate 100 is retracted to a proximal position relative to jaws 16.
[0172] Referring to FIG. 73 , when latch retractor 128 is cammed downwardly relative to spindle 60, spindle 60 has moved distally to a predetermined distance. The action of spindle 60, now engaging driver 66, pushes driver 66 distally. Driver 66 draws slider joint 68 and simultaneously slider joint 68 drags latch retractor 128 distally mechanically forcing cam surface no. of latch retractor 128 downward to underside of jaw pad 172 and engaging latch retractor 128 with slot 126 of spindle 60.
[0173] Referring to FIGS. 74-75 , as trigger 18 is fully compressed to drive spindle 60 to a distal-most position, rack 38 clears pawl 42 so that the entire drive assembly can retract when the trigger is released. Notably, a full stroke of the spindle 60 is required to take a clip 72 from an initial position to a fully inserted position in the jaws 16. As spindle 60 moves through its distal-most position, it moves driver 66 in the manner described hereinabove to crimp a surgical clip 72. For example, referring to FIGS. 76-79 , driver 66 advances distally relative to camming surfaces 160 on jaws 16a and 16b, such that camming surfaces 184 on driver 66 cam jaws 16a and 16b closed thereby closing surgical clip 72 contained therebetween.
[0174] Referring for the moment to FIG. 80 , a security mechanism is provided to prevent an overstroke condition and thereby excessive compression of clip 72 from damaging tissue, jaws 16 or driver 66. If trigger 18 is continued to be squeezed past a stroke required for a full forming of clip 72 impact spring 56 compresses within the space defined between knob 20 and bushing 48 thereby preventing any further distal movement of spindle 60.
[0175] A fully formed clip formed about vessel V is illustrated in FIG. 81 .
[0176] Referring to FIG. 82 , as trigger 18 is released (not shown), pawl 42 rotates against the bias of pawl spring 46 such that pawl teeth 44 ride along rack teeth 40 to reset the handle assembly. As shown in FIG. 83 , when driver 66 retracts, latch retractor 128 is again biased up into its upper-most position, thereby, resetting the drive mechanism.
[0177] Referring to FIGS. 84-86 , as spindle 60 retracts, raised feature 118 of spindle 60 moves past flexible leg 152 in filler component 102. It should be noted that wedge plate 100 does not move as it has already fully retracted. As spindle 60 retracts, it draws cam link 104 proximally within slots 136 and 148 of wedge plate 100 and filler component 102 to its initial position. As best seen in FIG. 86 , in this position, clip applier 10 is again in an initial position to be refired and thus to attach another clip to a vessel.
Claims
What is claimed is:
1. An apparatus for application of surgical clips to body tissue, which comprises:
a) a handle portion;
b) a body extending distally from the handle portion and defining a longitudinal axis;
c) a plurality of surgical clips disposed within the body;
d) a jaw assembly mounted adjacent a distal end portion of the body, the jaw assembly including first and second jaw portions movable between a spaced-apart and an approximated position;
e) a wedge plate longitudinally movable between the first and the second jaw portions;
wherein said wedge plate biases the first and the second jaw portions when said wedge plate is longitudinally moved between the first and the second jaw portions;
wherein said wedge plate maintains the first and the second jaw portions in the spaced-apart position and preventing flexing of the first and the second jaw portions during clip loading; and
wherein said wedge plate has a first proximal window, said first proximal window to be engaged by a member disposed in said body, said member being configured to hold said wedge plate in a distal most position, said distal most position being between the first and the second jaw portions;
f) a clip pusher configured to individually distally advance a surgical clip to the jaw assembly while the first and the second jaw portions are in the spaced-apart position;
g) an actuator at least partially disposed within the body and longitudinally movable in response to actuation of the handle portion, the actuator having a cam link; and
h) a jaw closure member positioned adjacent the first and second jaw portions to move the first and the second jaw portions from the spaced-apart position to the approximated position, wherein said cam link longitudinally moves said wedge plate between the first and the second jaw portions.
2. The apparatus of claim 1, wherein said wedge plate has a rounded distal tip.
3. The apparatus of claim 1, wherein said wedge plate has a second proximal window, said second proximal window adapted to be engaged by said member, said second proximal window configured to hold said wedge plate in a proximal most position being retracted from said first and said second jaw portions, said proximal most position of said wedge plate configured to allow the first and the second jaw from the spaced-apart position portions to be moved to the approximated position to compress said clip.
4. The apparatus of claim 3, wherein said first proximal window is connected to said second proximal window by a longitudinal slot.
5. The apparatus of claim 3, wherein said member is movable from said second proximal window to first proximal window by moving said wedge plate distally.
6. The apparatus of claim 1, wherein said cam link is engageable with a cam slot in said wedge plate, wherein said cam slot has a driving edge.
7. The apparatus of claim 1, wherein said member is a flexible leg.
8. An apparatus for application of surgical clips to body tissue, which comprises:
a) a handle portion;
b) a body extending distally from the handle portion and defining a longitudinal axis;
c) a plurality of surgical clips disposed within the body;
d) a jaw assembly mounted adjacent a distal end portion of the body, the jaw assembly including first and second law portions movable between a spaced-apart and an approximated position;
e) a wedge plate longitudinally movable between the first and the second jaw portions;
f) a clip pusher configured to individually distally advance a surgical clip to the jaw assembly while the first and the second jaw portions are in the spaced-apart position;
g) an actuator at least partially disposed within the body and longitudinally movable in response to actuation of the handle portion, the actuator having a cam link;
wherein said cam link is engageable with a cam slot in said wedge plate, wherein said cam slot has a driving edge;
wherein said cam slot has a proximal side and a distal side, wherein at said distal side said cam link traverses past said driving edge at a demarcation line; and
wherein at said demarcation line said cam link terminates distal movement of said wedge plate; and
h) a jaw closure member positioned adjacent the first and the second jaw portions to move the first and the second jaw portions from the spaced-apart position to the approximated position, wherein said cam link longitudinally moves said wedge plate between the first and the second jaw portions.
9. The apparatus of claim 8, wherein said wedge plate further comprises a biasing device, and wherein at said demarcation line the disengagement between said cam link and said driving edge permits said biasing device to retract said wedge plate.
10. The apparatus of claim 9, wherein said wedge plate has a rounded distal end, wherein said cam link disengages said wedge plate at said demarcation line, and wherein the disengagement of said cam link permits retraction of said rounded distal end from between the first and the second jaw portions.
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