US 9,039,720 B2Grant
Surgical instrument with ratcheting rotatable shaft
Issue Date:2015-05-26
•15 Claims
•7 Drawing Sheets
Abstract
An ultrasonic surgical instrument comprises a reusable housing including an internal transducer and an internal end effector rotation assembly. An exemplary rotation assembly is a ratchet and pawl assembly, which allows the transducer to rotate in a first direction but not in a second, opposite direction. The end effector, including an integral torque wrench, is attached to the transducer to form a single unit that is rotatable relative to the housing. The transducer attaches to a stationary cable via slip rings. The cable communicates with a generator, which provides electrical power to the transducer. The transducer converts the electrical power into ultrasonic vibrational energy, which is transmitted to the end effector.
Metadata
Assignee
- Ethicon Endo-Surgery, Inc.
Inventor
- Ashvani K. Madan
Application Information
Application Number:US 13/274,540
Filing Date:2011-10-17
Priority Date:2010-11-05
Art Unit:3731
Classifications
IPC:
A61B17/32A61B18/14A61B17/00A61B18/00A61B18/04H02J7/00H01M2/26H01M2/10A61B18/12A61B19/00A61B17/064A61B17/285A61B17/29
Patent Drawings (7 sheets)
Description
Priority
[0001] This application claims priority to U.S. Provisional Patent Application Ser. No. 61/410,603, filed Nov. 5, 2010, entitled “Energy-Based Surgical Instruments,” the disclosure of which is incorporated by reference herein. This application also claims priority to U.S. Provisional Patent Application Ser. No. 61/487,846, filed May 19, 2011, entitled “Energy-Based Surgical Instruments,” the disclosure of which is incorporated by reference herein.
Background
[0002] In some settings, endoscopic surgical instruments may be preferred over traditional open surgical devices since a smaller incision may reduce the post-operative recovery time and complications. Consequently, some endoscopic surgical instruments may be suitable for placement of a distal end effector at a desired surgical site through a cannula of a trocar. These distal end effectors may engage tissue in a number of ways to achieve a diagnostic or therapeutic effect (e.g., endocutter, grasper, cutter, stapler, clip applier, access device, drug/gene therapy delivery device, and energy delivery device using ultrasound, RF, laser, etc.). Endoscopic surgical instruments may include a shaft between the end effector and a handle portion, which is manipulated by the clinician. Such a shaft may enable insertion to a desired depth and rotation about the longitudinal axis of the shaft, thereby facilitating positioning of the end effector within the patient.
[0003] Examples of endoscopic surgical instruments include those disclosed in U.S. Pat. Pub. No. 2006/0079874, entitled “Tissue Pad Use with an Ultrasonic Surgical Instrument,” published Apr. 13, 2006, the disclosure of which is incorporated by reference herein; U.S. Pat. Pub. No. 2007/0191713, entitled “Ultrasonic Device for Cutting and Coagulating,” published Aug. 16, 2007, the disclosure of which is incorporated by reference herein; U.S. Pat. Pub. No. 2007/0282333, entitled “Ultrasonic Waveguide and Blade,” published Dec. 6, 2007, the disclosure of which is incorporated by reference herein; U.S. Pat. Pub. No. 2008/0200940, entitled “Ultrasonic Device for Cutting and Coagulating,” published Aug. 21, 2008, the disclosure of which is incorporated by reference herein; U.S. Pat. Pub. No. 2011/0015660, entitled “Rotating Transducer Mount for Ultrasonic Surgical Instruments,” published Jan. 20, 2011, issued on Jun. 11, 2013 as U.S. Pat. No. 8,461,744, the disclosures of which are incorporated by reference herein; U.S. Pat. No. 6,500,176, entitled “Electrosurgical Systems and Techniques for Sealing Tissue,” issued Dec. 31, 2002, the disclosure of which is incorporated by reference herein; and U.S. Pat. Pub. No. 2011/0087218, entitled “Surgical Instrument Comprising First and Second Drive Systems Actuatable by a Common Trigger Mechanism,” published Apr. 14, 2011, issued on Jan. 27, 2015 as U.S. Pat. No. 8,939,974, the disclosure of which is incorporated by reference herein. Additionally, such surgical tools may include a cordless transducer such as that disclosed in U.S. Pat. Pub. No. 2009/0143797, entitled “Cordless Hand-held Ultrasonic Cautery Cutting Device,” published Jun. 4, 2009, issued on Apr. 16, 2013 as U.S. Pat. No. 8,419,757, the disclosures of which are incorporated by reference herein. In addition, the surgical instruments may be used, or adapted for use, in robotic-assisted surgery settings such as that disclosed in U.S. Pat. No. 6,783,524, entitled “Robotic Surgical Tool with Ultrasound Cauterizing and Cutting Instrument,” issued Aug. 31, 2004.
[0004] While a variety of ultrasonic medical devices connected to transducers have been made and used, it is believed that no one prior to the inventor(s) has made or used an invention as described herein.
Brief Description of the Drawings
[0005] While the specification concludes with claims which particularly point out and distinctly claim the invention, it is believed the present invention will be better understood from the following description of certain examples taken in conjunction with the accompanying drawings, in which like reference numerals identify the same elements and in which:
[0006] FIG. 1 depicts a perspective view of an exemplary surgical system having a surgical instrument and a generator;
[0007] FIG. 2 depicts a partial side elevation view of an exemplary surgical instrument with a portion of a cover removed to show the interior of a mating housing portion of an exemplary multi-piece handle assembly;
[0008] FIG. 3 depicts a partial perspective view of a distal end of an exemplary transducer;
[0009] FIG. 4 depicts a perspective view of an exemplary transmission assembly;
[0010] FIG. 5 depicts a side cross-sectional view of an exemplary surgical instrument including an internal transducer coupled to an effector and a rotation assembly to rotate the transducer and effector; and
[0011] FIG. 6 depicts a fragmentary, detail view of the rotation assembly of FIG. 5 .
[0012] The drawings are not intended to be limiting in any way, and it is contemplated that various embodiments of the invention may be carried out in a variety of other ways, including those not necessarily depicted in the drawings. The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention, and together with the description serve to explain the principles of the invention; it being understood, however, that this invention is not limited to the precise arrangements shown.
Detailed Description
[0013] The following description of certain examples of the invention should not be used to limit the scope of the present invention. Other examples, features, aspects, embodiments, and advantages of the invention will become apparent to those skilled in the art from the following description, which is by way of illustration, one of the best modes contemplated for carrying out the invention. As will be realized, the invention is capable of other different and obvious aspects, all without departing from the invention. Accordingly, the drawings and descriptions should be regarded as illustrative in nature and not restrictive.
[0014] I. Overview of Exemplary Ultrasonic Surgical System
[0015] FIG. 1 shows an exemplary ultrasonic surgical system (10) comprising an ultrasonic surgical instrument (50), a generator (20), and a cable (30) coupling generator (20) to surgical instrument (50). In some versions, generator (20) comprises a GEN 300 sold by Ethicon Endo-Surgery, Inc. of Cincinnati, Ohio. In addition or in the alternative, generator (20) may be constructed in accordance with at least some of the teachings of in U.S. Pat. Pub. No. 2011/0087212, entitled “Surgical Generator for Ultrasonic and Electrosurgical Devices,” published Apr. 14, 2011, the disclosure of which is incorporated by reference herein. While surgical instrument (50) is described herein as an ultrasonic surgical instrument, it should be understood that the teachings herein may be readily applied to a variety of surgical instruments, including but not limited to endocutters, graspers, cutters, staplers, clip appliers, access devices, drug/gene therapy delivery devices, and energy delivery devices using ultrasound, RF, laser, etc., and/or any combination thereof as will be apparent to one of ordinary skill in the art in view of the teachings herein. Moreover, while the present example will be described in reference to a cable-connected surgical instrument (50), it should be understood that surgical instrument (50) may be adapted for cordless operation, such as that disclosed in U.S. Pat. Pub. No. 2009/0143797, entitled “Cordless Hand-held Ultrasonic Cautery Cutting Device,” published Jun. 4, 2009, issued on Apr. 16, 2013 as U.S. Pat. No. 8,419,757, the disclosures of which are incorporated by reference herein. For instance, surgical device (50) may include an integral and portable power source such as a battery, etc. Furthermore, surgical device (50) may also be used, or adapted for use, in robotic-assisted surgery settings such as that disclosed in U.S. Pat. No. 6,783,524, entitled “Robotic Surgical Tool with Ultrasound Cauterizing and Cutting Instrument,” issued Aug. 31, 2004.
[0016] Surgical instrument (50) of the present example includes a multi-piece handle assembly (60), an elongated transmission assembly (70), and a transducer (100). Transmission assembly (70) is coupled to multi-piece handle assembly (60) at a proximal end of transmission assembly (70) and extends distally from multi-piece handle assembly (60). In the present example, transmission assembly (70) is configured as an elongated, thin tubular assembly for endoscopic use, but it should be understood that transmission assembly (70) may alternatively be a short assembly, such as those disclosed in U.S. Pat. Pub. No. 2007/0282333, entitled “Ultrasonic Waveguide and Blade,” published Dec. 6, 2007, and U.S. Pat. Pub. No. 2008/0200940, entitled “Ultrasonic Device for Cutting and Coagulating,” published Aug. 21, 2008, the disclosures of which are incorporated by reference herein. Transmission assembly (70) of the present example comprises an outer sheath (72), an inner tubular actuating member (not shown), a waveguide (not shown), and an end effector (80) located on the distal end of transmission assembly (70). In the present example, end effector (80) comprises a blade (82) that is mechanically and acoustically coupled to the waveguide, a clamp arm (84) operable to pivot at the proximal end of transmission assembly (70), and a clamp pad (86) coupled to clamp arm (84). It should also be understood that clamp arm (84) and associated features may be constructed and operable in accordance with at least some of the teachings of U.S. Pat. No. 5,980,510, entitled “Ultrasonic Clamp Coagulator Apparatus Having Improved Clamp Arm Pivot Mount,” issued Nov. 9, 1999, the disclosure of which is incorporated by reference herein.
[0017] Exemplary versions of end effector (80) and transmission assembly (70) will be discussed in greater detail below in reference to the example shown in FIG. 4 . In some versions, transducer (100) comprises a plurality of piezoelectric elements (not shown) that are compressed between first resonator (not shown) and second resonator (not shown) to form a stack of piezoelectric elements. The piezoelectric elements may be fabricated from any suitable material, for example, lead zirconate-titanate, lead meta-niobate, lead titanate, and/or any suitable piezoelectric crystal material, for example. Transducer (100) further comprises electrodes, including at least one positive electrode and at least one negative electrode that are configured to create a voltage potential across the one or more piezoelectric elements, such that the piezoelectric elements convert the electrical power into ultrasonic vibrations. The ultrasonic vibrations are transmitted to blade (82) via the waveguide in transmission assembly (70).
[0018] Multi-piece handle assembly (60) of the present example comprises a mating housing portion (62) and a lower portion (64). Mating housing portion (62) is configured to receive transducer (100) at a proximal end of mating housing portion (62) and to receive the proximal end of transmission assembly (70) at a distal end of mating housing portion (62). A rotation knob (66) is shown in the present example to rotate transmission assembly (70) and transducer (100), but it should be understood that rotation knob (66) is merely optional. Mating housing portion (62) will be discussed in greater detail below in reference to FIG. 2 . Lower portion (64) of multi-piece handle assembly (60) shown in FIG. 1 includes a trigger (68) and is configured to be grasped by a user using a single hand. One merely exemplary alternative version for lower portion (64) is depicted in FIG. 1 of U.S. Pat. Pub. No. 2011/0015660, entitled “Rotating Transducer Mount for Ultrasonic Surgical Instruments,” published Jan. 20, 2011, issued on Jun. 6, 2013, as U.S. Pat. No. 8,461,744, the disclosure of which is incorporated by reference herein. Toggle buttons (69), shown in FIG. 2 of the present disclosure, are located on a distal surface of lower portion (64) and are operable to selectively activate transducer (100) at different operational levels using generator (20). For instance, a first toggle button (69) may activate transducer (100) at a maximum energy level while a second toggle button (69) may activate transducer (100) at a minimum, non-zero energy level. Of course, toggle buttons (69) may be configured for energy levels other than a maximum and/or minimum energy level as will be apparent to one of ordinary skill in the art in view of the teachings herein. It should also be understood that zero, one, or more than two toggle buttons (69) may be provided. While multi-piece handle assembly (60) has been described in reference to two distinct portions (62, 64), it should be understood that multi-piece handle assembly (60) may be a unitary assembly with both portions (62, 64) combined. Multi-piece handle assembly (60) may alternatively be divided into multiple discrete components, such as a separate trigger portion (operable either by a user's hand or foot) and a separate mating housing portion (62). Such a trigger portion may be operable to activate transducer (100) and may be remote from mating housing portion (62). Multi-piece handle assembly (60) may be constructed from a durable plastic (such as polycarbonate or a liquid crystal polymer), ceramics, metals, and/or any other suitable material as will be apparent to one of ordinary skill in the art in view of the teachings herein. In some other versions, trigger (68) and/or toggle buttons (69) are omitted. For instance, instrument (50) may be operated as part of a robotic system.
[0019] Other configurations for multi-piece handle assembly (60) will also be apparent to those of ordinary skill in the art in view of the teachings herein. By way of example only, surgical instrument (50) may be constructed in accordance with at least some of the teachings of U.S. Pat. No. 5,322,055 entitled “Clamp Coagulator/Cutting System for Ultrasonic Surgical Instruments,” issued Jun. 21, 1994, the disclosure of which is incorporated by reference herein; U.S. Pat. No. 5,873,873 entitled “Ultrasonic Clamp Coagulator Apparatus Having Improved Clamp Mechanism,” issued Feb. 23, 1999, the disclosure of which is incorporated by reference herein; U.S. Pat. No. 5,980,510, entitled “Ultrasonic Clamp Coagulator Apparatus Having Improved Clamp Arm Pivot Mount,” filed Oct. 10, 1997, the disclosure of which is incorporated by reference herein; U.S. Pat. No. 6,325,811 entitled “Blades with Functional Balance Asymmetries for use with Ultrasonic Surgical Instruments,” issued Dec. 4, 2001, the disclosure of which is incorporated by reference herein; U.S. Pub. No. 2006/0079874 entitled “Tissue Pad for Use with an Ultrasonic Surgical Instrument,” published Apr. 13, 2006, the disclosure of which is incorporated by reference herein; U.S. Pub. No. 2007/0191713 entitled “Ultrasonic Device for Cutting and Coagulating,” published Aug. 16, 2007, the disclosure of which is incorporated by reference herein; U.S. Pub. No. 2007/0282333 entitled “Ultrasonic Waveguide and Blade,” published Dec. 6, 2007, the disclosure of which is incorporated by reference herein; U.S. Pub. No. 2008/0200940 entitled “Ultrasonic Device for Cutting and Coagulating,” published Aug. 21, 2008, the disclosure of which is incorporated by reference herein; U.S. Pub. No. 2009/0143797, entitled “Cordless Hand-held Ultrasonic Cautery Cutting Device,” published Jun. 4, 2009, issued on Apr. 16, 2013 as U.S. Pat. No. 8,419,757, the disclosures of which are incorporated by reference herein; U.S. Pub. No. 2010/0069940 entitled “Ultrasonic Device for Fingertip Control,” published Mar. 18, 2010, the disclosure of which is incorporated by reference herein; U.S. Pub. No. 2011/0015660, entitled “Rotating Transducer Mount for Ultrasonic Surgical Instruments,” published Jan. 20, 2011, issued on Jun. 6, 2013 as U.S. Pat. No. 8,461,744, the disclosure of which is incorporated by reference herein; and/or U.S. Provisional Application Ser. No. 61/410,603, filed Nov. 5, 2010, entitled “Energy-Based Surgical Instruments,” the disclosure of which is incorporated by reference herein.
[0020] It is further understood that any one or more of the teachings, expressions, embodiments, examples, etc. described herein may be combined with any one or more of the other teachings, expressions, embodiments, examples, etc. that are described herein. The following-described teachings, expressions, embodiments, examples, etc. should therefore not be viewed in isolation relative to each other. Various suitable ways in which the teachings herein may be combined will be readily apparent to those of ordinary skill in the art in view of the teachings herein. Such modifications and variations are intended to be included within the scope of the claims.
[0021] II. Exemplary Coupling Assemblies for Ultrasonic Surgical Instrument
[0022] In some instances it may be useful to detach transmission assembly (70) from multi-piece handle assembly (60) and transducer (100). For instance, a detachable transmission assembly (70) may permit the reuse of multi-piece handle assembly (60) with multiple transmission assemblies (70) having various end effectors (80). By way of example only, the various end effectors (80) may have different sized and/or shaped blades (82) or the various end effectors (80) may have entirely different functions, such as RF end effectors, stapling end effectors, cutting end effectors, etc. Similarly, various transmission assemblies (70) may have different shaft lengths, such that a user may readily select a transmission assembly (70) having a desired shaft length for use with handle assembly (60). Furthermore, a single multi-piece handle assembly (60) may be reused for different operations by a user by removing a dirty transmission assembly (70), optionally cleaning multi-piece handle assembly (60), and coupling a new transmission assembly (70) to multi-piece handle assembly (60) for a new operation. Accordingly, configuring multi-piece handle assembly (60) to couple with a variety of transmission assemblies (70) may be preferable for some users of surgical instrument (50).
[0023] A. Exemplary Multi-Piece Handle Assembly
[0024] FIG. 2 shows a partial side view of multi-piece handle assembly (60) with a portion of a cover (61) removed to show the internal components contained within mating housing portion (62) and a section of lower portion (64). As described above, lower portion (64) includes a pivotable trigger (68) and a pair of toggle buttons (69). Trigger (68) of the present example is pivotable from a distal, open position to a proximal, closed position. A trigger assembly (150) is coupled to trigger (68) and is pivotally supported within multi-piece handle assembly (60). Trigger assembly (150) of the present example comprises a pivotable attachment arm (152) that may be pivoted about a pin (not shown), a trigger arm (154), an intermediate link (156), and an actuation arm (158). Actuation arm (158) is coupled to a trigger yoke (170) at the distal end of actuation arm (158). Actuation arm (158) comprises one or more mounting pins (160) extending outwardly from actuation arm (158) and pins (160) are sized to be slidably received in corresponding elongated channel (162) formed in cover (61). Accordingly, when trigger (68) is pivoted proximally from the open position to the closed position attachment arm (152) and trigger arm (154) pivot within multi-piece handle assembly (60). Intermediate link (156) coupled to trigger arm (154) transfers this pivoting motion from trigger arm (154) to actuation arm (158) to slidably translate actuation arm (158) proximally via pins (160) within channel (162). Trigger yoke (170), which is coupled to actuation arm (158), is translated proximally as well. In the present example, trigger yoke (170) is coupled to a force-limiting mechanism (180), which is further coupled to transmission assembly (70) as will be described in more detail below, to operate inner tubular actuating member (74). A cavity (140), shown in FIG. 2 , is configured to receive transducer (100) therein from a transducer aperture (142) formed in cover (61). Cavity (140) is configured to receive at least a portion of transducer (100) therein such that transducer (100) and transmission assembly (70) may be coupled together. Still other configurations for multi-piece handle assembly (60) will be apparent to one of ordinary skill in the art in view of the teachings herein.
[0025] B. Exemplary Transducer
[0026] As shown in FIG. 3 , transducer (100) of the present example is a tubular component that is coupled to generator (20) via cable (30), though it should be understood that transducer (100) may instead be a cordless transducer. For instance, transducer (100) may instead receive power from a power source that is contained within handle assembly (60), in accordance with the teachings of various references cited herein or otherwise. In the present example, transducer (100) includes a first conductive ring (102) and a second conductive ring (104), which are disposed within a body (110) of transducer (100). In the present example, first conductive ring (102) comprises a ring member having one or more electrical contacts that are disposed on the ring member and that are configured to electrically couple first conductive ring (102) to a power source. First conductive ring (102) is disposed between body (110) and a horn (120) extending distally from body (110). Horn (120) comprises distal horn threads (122) such that horn (120) is coupleable to waveguide (210), as will be discussed below in reference to FIG. 4 . First conductive ring (102) of the present example is coaxial with and adjacent to a flange (106). Flange (106) of the present example is configured to further mechanically couple transducer (100) within multi-piece handle assembly (60). A transducer cavity (108) is disposed between first conductive ring (102) and a second conductive ring (104) such that first conductive ring (102) is electrically isolated from second conductive ring (104) and/or other conductive components of transducer (100). First conductive ring (102) is located on a non-conductive platform extending distally from body (110). First conductive ring (102) is electrically coupled to cable (30), shown in FIG. 1 , by one or more electrical wires or conductive etchings (not shown) within body (110). Such electrical coupling of first conductive ring (102) to cable (30) may include a slip ring to facilitate free rotation of transducer (100) relative to cable (30).
[0027] Second conductive ring (104) of transducer (100) similarly comprises a ring member that is disposed between body (110) and horn (120). Second conductive ring (104) is disposed between first conductive ring (102) and horn (120). As is shown in FIG. 3 , first and second conductive rings (102, 104) are coaxial members. Second conductive ring (104) is likewise electrically isolated from first conductive ring (102) and other conductive components of transducer (100). Similar to first conductive ring (102), second conductive ring (104) extends from the non-conductive platform. One or more washer-shaped spacers (112) may be disposed between second conductive ring (104) and horn (120) to isolate the vibrations transmitted through horn (120) from the other components of transducer (100). Second conductive ring (104) is also electrically coupled to cable (30), shown in FIG. 1 , by one or more electrical wires or conductive etchings (not shown) within body (110). Such electrical coupling of second conductive ring (104) to cable (30) may also include a slip ring to facilitate free rotation of transducer (100) relative to cable (30). One merely exemplary suitable ultrasonic transducer (100) is Model No. HP054, sold by Ethicon Endo-Surgery, Inc. of Cincinnati, Ohio, though it should be understood that any other suitable transducer may be used.
[0028] As shown in the present example, the distal end of transducer (100) threadably couples to the proximal end of a transmission assembly via horn (120). The distal end of transducer (100) also interfaces with one or more electrical connections (not shown) via first and second conductive rings (102, 104) to electrically couple transducer (100) to toggle buttons (69) to provide a user with finger-activated controls for activating transducer (100) while using surgical instrument (50). The interface between the one or more electrical connections and the first and second conductive rings (102, 104) may include a slip ring connection to permit free rotation of transducer (100) relative to multi-piece handle assembly (60). Still other configurations for transducer (100) will be apparent to one of ordinary skill in the art in view of the teachings herein. For instance, first and second conductive rings (102, 104) may be omitted from the distal end of transducer (100) and the electrical coupling of transducer (100) to toggle buttons (69) may be accomplished by alternative structures, such as conductors at the proximal end of transducer (100), conductors located along the side of body (110) of transducer (100), directly from cable (30), and/or otherwise. When transducer (100) of the present example is activated via a toggle button (69), transducer (100) is operable to create mechanical energy in the form of linear oscillations or vibrations (e.g., torsional or transverse, etc.), at an ultrasonic frequency (such as 55.5 kHz). When transducer (100) is coupled to transmission assembly (70) via horn (120), these mechanical oscillations are transmitted through the internal waveguide of transmission assembly (70) to end effector (80). In the present example, with blade (82) being coupled to the waveguide, blade (82) thereby oscillates at the ultrasonic frequency. Thus, when tissue is secured between blade (82) and clamp arm (84), the ultrasonic oscillation of blade (82) may simultaneously sever tissue and denature the proteins in adjacent tissue cells, thereby providing a coagulative effect with relatively little thermal spread. An electrical current may also be provided through blade (82) and clamp arm (84) to cauterize the tissue. While some configurations for transducer (100) have been described, still other suitable configurations for transducer (100) will be apparent to one or ordinary skill in the art in view of the teachings herein.
[0029] C. Exemplary Transmission Assembly for Threaded Attachment
[0030] As noted previously, in some instances it may be useful to detach transmission assembly (70) from multi-piece handle assembly (60) and transducer (100). Merely exemplary instances include the use of multi-piece handle assembly (60) with multiple transmission assemblies (70) having different sized and/or shaped blades (82), use with various end effectors (80) with entirely different functions and/or modalities (e.g., RF end effectors, stapling end effectors, cutting end effectors, etc.), or for reuse of a single multi-piece handle assembly (60) for multiple operations by a user. Accordingly, a version permitting the user to swap transmission assemblies (70) with multi-piece handle assembly (60) may be useful. It should also be understood that transducer (100) may be replaced with a motor and/or various other substitutions may be made.
[0031] One merely exemplary transmission assembly (200) is shown in FIG. 4 having a proximal end (202), a distal end (204), a waveguide (210), an inner tubular actuating member (220), an outer sheath (230), and an end effector (240) at the distal end of transmission assembly (200). In the present example, waveguide (210), inner tubular actuating member (220), and outer sheath (230) are coaxial members with waveguide (230) in the center, inner actuating member (220) disposed about waveguide (210), and outer sheath (230) disposed about inner actuating member (220).
[0032] Referring to distal end (204) of transmission assembly (200) first, end effector (240) comprises a blade (242), a clamp arm (244), and one or more optional clamp pads (246). In the present example, blade (242) is coupled to waveguide (210) such that the mechanical vibrations transmitted to waveguide (210) from transducer (100) are also transmitted to blade (242). Merely exemplary couplings for blade (242) to waveguide (210) include welding blade (242) to waveguide (210), integrally forming blade (242) with waveguide (210), mechanically or chemically coupling blade (242) to waveguide (210), and/or any other suitable configuration as will be apparent to one of ordinary skill in the art in view of the teachings herein. In some versions, blade (242) is a curved blade, such as blade (242) shown in FIG. 4 ; and in some versions blade (242) may be a straight blade. Furthermore, blade (242) may have a variety of shapes and sizes. In the present example, blade (242) is a tapered rectangular blade, though it should be understood that blade (242) may be cylindrical, triangular, hemi-cylindrical, square, hooked, and/or any other shape for blade (242). Furthermore, additional features may be added to blade (242), including spherical tips, hooked tips, square tips, serrated edging, and/or any other additional features. Still other configurations for blade (242) will be apparent to those of ordinary skill in the art in view of the teachings herein.
[0033] Clamp arm (244) of the present example is a curved member that corresponds to the curvature of blade (242). Clamp arm (244) may optionally include clamp pads (246) to grip or secure tissue against blade (242). Such clamp pads may be configured in accordance with at least some of the teachings of U.S. Pat. Pub. No. 2006/0079874, entitled “Tissue Pad for Use with an Ultrasonic Surgical Instrument,” published Apr. 13, 2006. Pivotal movement of clamp arm (244) with respect to blade (242) is accomplished by a first pair of pivot points (248) on clamp arm (244) that pivotally couple to outer sheath (230) and a second set of pivot points (249) on clamp arm (244) that pivotally couple to inner tubular actuating member (220). In the present example, outer sheath (230) is coupleable to multi-piece handle assembly (60) through a rotation knob (250), thereby mechanically grounding outer sheath (230). First set of pivot points (248) of clamp arm (244) are pivotally connected to outer sheath (230) via corresponding through holes (232) on outer sheath (230). In some versions, first set of pivot points (248) comprise through holes and a securing pin or rivet may be inserted through first set of pivot points (248) and through through holes (232) to secure clamp arm (244) to outer sheath (230). The pin in this version may be laser welded to clamp arm (244) or the pin may be laser welded to outer sheath (230). Of course through holes (232) may instead be outwardly extending pins and first set of pivot points (248) may be through holes. As yet another merely illustrative example, clamp arm (244) may be coupled in accordance with at least some of the teachings of U.S. Pat. No. 5,980,510, entitled “Ultrasonic Clamp Coagulator Apparatus having Improved Clamp Arm Pivot Mount,” issued Nov. 9, 1999, the disclosure of which is incorporated by reference herein. Still other suitable ways in which clamp arm (244) may be coupled will be apparent to one of ordinary skill in the art in view of the teachings herein.
[0034] Second set of pivot points (249) of clamp arm (244) are pivotally connected to inner tubular actuating member (220) via corresponding through holes (222) on inner tubular actuating member (220). In some versions, second set of pivot points (249) comprise through holes and a securing pin or rivet may be inserted through second set of pivot points (249) and through through holes (222) to secure clamp arm (244) to inner tubular actuating member (220). The pin in this version may be laser welded to clamp arm (244) or the pin may be laser welded to inner tubular actuating member (220). Of course through holes (222) may instead be outwardly extending pins and second set of pivot points (249) may be through holes. Still other pivotable configurations for second set of pivot points (249) and through holes (222) will be apparent to one of ordinary skill in the art in view of the teachings herein.
[0035] With clamp arm (244) so secured to outer sheath (230) and inner tubular actuating member (220), clamp arm (244) is pivotable when inner tubular actuating member (220) translates longitudinally. In the present example, inner tubular actuating member (220) is translatable relative to the longitudinal axis of outer sheath (230) and is coupled to force-limiting mechanism (180) within multi-piece handle assembly (60). Thus, when force-limiting mechanism (180) translates via trigger (68) and trigger assembly (150), clamp arm (244) is pivotable from an open position to a closed position. It should be understood that, as with other components referred to herein, clamp arm (84, 244) is merely optional. Likewise, trigger (68) and trigger assembly (150) and the components described herein for pivoting clamp arm (84, 244) are also merely optional. Thus, some versions of end effector (80, 240) may simply consist of a blade (82, 842) and/or other features.
[0036] As shown in FIG. 4 , a spacer (290) is insertable between clamp arm (244) and blade (242) to maintain clamp arm (244) in the open position. Spacer (290) has a flat bottom surface (292) and an angled top surface (294) in this example. Top surface (294) is set at an angle to maintain clamp arm (244) in the open position relative to blade (242) when bottom surface (292) abuts blade (242). In some versions, bottom surface (292) may be configured to snap or clip onto blade (242) to secure spacer (290) relative to blade (242). Alternatively, a recess may be provided in spacer (290) such that spacer (290) may be slid onto blade (242). Further still, an adhesive may be applied to bottom surface (292) and/or top surface (294) to also secure spacer (290). Thus, when spacer (290) is inserted between clamp arm (244) and blade (242), clamp arm (244) is prevented from pivoting to a closed position. This may permit a user to couple transmission assembly (200) to multi-piece handle assembly (60) while maintaining both clamp arm (244) and trigger (68) in their respective open positions. Alternatively, a user may couple transmission assembly (200) to multi-piece handle assembly (60) without the use of spacer (290). For example, the user may couple different components of transmission assembly (200) with different components of handle assembly (60) at different times, such as in the manner described below or otherwise.
[0037] Referring now to proximal end (202) of transmission assembly (200), a rotation knob (250) couples outer sheath (230) to multi-piece handle assembly (60). In the present example, rotation knob (250) comprises an inner ring portion (not shown) having one or more connectors (252) extending proximally therefrom, an outer ring (254), and a pin (not shown) extending through outer ring (254), outer sheath (230), inner tubular actuating member (220), and waveguide (210). Accordingly, when outer ring (254) of rotation knob (250) is rotated, waveguide (210), inner tubular actuating member (220), and outer sheath (230) also rotate. Inner ring portion and outer ring (254) of the present example are complementary bearing components such that outer ring (254) is rotatable relative to inner ring portion. It should be understood that the pin does not extend though inner ring portion. As previously noted, inner ring portion includes connectors (252). In the present example connectors (252) are shown as snap-fit connectors, though other suitable connecting features, such as threading, adhesives, pins, clips, snaps, and/or other connectors may be used as will be apparent to one of ordinary skill in the art in view of the teachings herein. When transmission assembly (200) is assembled with multi-piece handle assembly (60) and transducer (100), as will be discussed below, connectors (252) of the present example insert into one or more recesses (not shown) and couple rotation knob (250) to cover (61) of multi-piece handle assembly (60). A release mechanism, such as a push button (not shown) on multi-piece handle assembly (60) or on rotation knob (250) may be provided to decouple connectors (252) from cover (61) when transmission assembly (200) is to be removed. Alternatively, connectors (252) may be designed to break-away when transmission assembly (200) is decoupled. Further still, if threading is used, inner portion of rotation knob (250) may be rotated to decouple from multi-piece handle assembly (60). Still other suitable configurations for rotation knob (250) will be apparent to one of ordinary skill in the art in view of the teachings herein.
[0038] Still referring to proximal end (202) of transmission assembly (200), external threads (228) are included at the proximal end of inner tubular actuating member (220) as shown in FIG. 4 . External threads (228) screw into complementary threads (not shown) of force-limiting mechanism (180), which is in turn driven by trigger assembly (150). Additionally, a recess having internal threading (218) is included at the proximal end of waveguide (210) as shown in FIG. 4 . Internal threading (218) screws onto horn threads (122) to mechanically and acoustically couple waveguide (210) to transducer (100). It should also be understood that force-limiting mechanism (180) need not be attached to inner tubular actuating member (220) at the same time other components of transmission assembly (200) are coupled with handle assembly (60). For instance, a user may first couple at least one feature of transmission assembly (200) with handle assembly (60) and secure the rotational position of transmission assembly (200), then rotate handle assembly (60) relative to transmission assembly (200) to complete the coupling of force limiting mechanism (180) with inner tubular actuating member (220). A similar approach may be taken to secure waveguide (210) with transducer (100). Of course other suitable configurations for transmission assembly (200) will be apparent to one or ordinary skill in the art in view of the teachings herein. Similarly, various other suitable ways in which transmission assembly (200) may be coupled with handle assembly (60) will be apparent to those of ordinary skill in the art in view of the teachings herein.
[0039] III. Exemplary Surgical Instrument Including Ratcheting Transducer Rotation Feature
[0040] FIG. 5 illustrates another exemplary version of surgical system (300). Surgical system (300) of this example includes generator (302) and ultrasonic surgical instrument (304). Generator (302) is coupled with ultrasonic transducer (306) of instrument (304) via a cable (308), though it should be understood that any other suitable medium may be used. In some versions, generator (302) is constructed in accordance with at least some of the teachings of in U.S. Pat. Pub. No. 2011/0087212, entitled “Surgical Generator for Ultrasonic and Electrosurgical Devices,” published Apr. 14, 2011, issued on Jun. 6, 2013 as U.S. Pat. No. 8,461,744, the disclosure of which is incorporated by reference herein. It should also be understood that system (300) may be constructed and operable in accordance with at least some of the teachings of U.S. Pat. Pub. No. 2011/0015660, entitled “Rotating Transducer Mount for Ultrasonic Surgical Instruments,” published Jan. 20, 2011, the disclosure of which is incorporated by reference herein; in accordance with teachings of any other reference cited herein; and/or otherwise. Furthermore, some versions of instrument (304) may include an integral generator or other type of integral power source, such that cable (308) and external generator (302) may be eliminated. While the present example is provided in the context of an ultrasonic surgical instrument (304), it should be understood that the teachings herein may be readily applied to various other kinds of instruments, including but not limited to cutting devices, staplers, graspers, clip appliers, electrosurgical instruments, etc.
[0041] Instrument (304) of the present example includes a handpiece assembly (310) and a transmission assembly (313). Handpiece assembly (310) of includes a shroud or housing (312), a pivoting trigger (319), and a button (392). Housing (312) may comprise metal, plastic, and/or any other suitable material. Housing (312) defines a pistol grip (317) and rotatably supports an internal acoustic assembly (316), which will be described in greater detail below. Pivoting trigger (319) is pivotable toward and away from pistol grip (317) to selectively pivot a clamp member (322), which will also be described in greater detail below. Button (392) is in communication with a controller (390) and is thereby operable to selectively activate acoustic assembly (316). In some versions, two or more buttons (392) are included. For instance, each button may be operable to activate acoustic assembly (316) at a respective different power level. It should be understood that handpiece assembly (310) may have a variety of other components, features, and configurations. Some exemplary alternative components, features, and configurations are taught in various references cited herein; while other alternatives will be apparent to those of ordinary skill in the art in view of the teachings herein.
[0042] Acoustic assembly (316) of the present example comprises an ultrasonic transducer (306), which comprises a plurality of piezoelectric elements that are operable to generate ultrasonic vibrations (e.g., at about 55.5 kHz) in response to electrical power provided through cable (308). These vibrations are transmitted to a fore-bell (336), which in turn communicates the ultrasonic vibrations to a waveguide (320). Transducer (306) is electrically coupled with generator (302) via cable (308). As described in greater detail below, acoustic assembly (316) rotates within housing (312), about axis (A). Thus, a pair of slip rings (340) are used to provide electrical continuity between generator (302) and transducer (306). Slip rings (340) allow cable (308) to remain rotationally stationary while transducer (306) rotates, preventing cable (308) from twisting and tangling; while maintaining full electrical contact between transducer (306) with generator (302) via cable (308). One or more rotary bearings (not shown) may also be used to support acoustic assembly (316) within housing (312), while also permitting acoustic assembly (316) to rotate within housing (312). By way of example only, acoustic assembly (316) and/or slip rings (340) may be constructed and operable in accordance with at least some of the teachings of U.S. Pat. Pub. No. 2011/0015660, the disclosure of which is incorporated by reference herein. Other suitable configurations for acoustic assembly (316) will be apparent to those of ordinary skill in the art in view of the teachings herein.
[0043] Transmission assembly (313) is similar to transmission assembly (70) described above; and includes an outer sheath (338), an interior waveguide (320), an integral torque wrench (318), and an end effector (314). A proximal end (326) of transmission assembly (313) is connected to a distal end (324) of acoustic assembly (316) to form a single unit that is removably disposed within housing (312). In particular, waveguide (320) of transmission assembly (313) is threadably coupled with transducer (306). Integral torque wrench (318) of transmission assembly (313) is configured to provide the appropriate level of torque in the coupling between waveguide (320) and transducer (306). By way of example only, when a user grasps torque wrench (318) to manually rotate transmission assembly (313) while coupling waveguide (320) with transducer (306), torque wrench (318) may provide an audible and/or tactile indication when an appropriate torque is achieved. Such feedback may include clicking sounds, a free-wheel spinning movement, and/or any other suitable feedback. Achieving a particular torque may substantially prevent undesired detachment of waveguide (320) from transducer (306) during use of instrument (304). Additionally, achieving a particular torque may optimize the acoustic coupling between transducer (306) and waveguide (320). In some other versions, torque wrench (318) is provided separately. In still other versions, torque wrench (318) is simply omitted.
[0044] End effector (314) is similar to end effector (240) described above; and includes a harmonic blade (315) and a pivoting clamp member (322). Harmonic blade (315) is acoustically coupled with waveguide (320), such that ultrasonic vibrations from transducer (306) are transmitted to blade (315) via waveguide (320). Clamp member (322) is operable to selectively pivot away and toward blade (315) in response to pivoting of trigger (319) relative to pistol grip (317). It should therefore be understood that transmission assembly (313) may include a component analogous to inner actuating member (220), described above, to actuate clamp member (322).
[0045] As noted above, acoustic assembly (316) and transmission assembly (314) form an integral unit that is rotatable relative to handpiece assembly (310). In the present example, instrument (304) includes a rotation assembly (344) that is operable to manually rotate the unit formed by acoustic assembly (316) and transmission assembly (314) relative to handpiece assembly (310). Rotation assembly (344) is incorporated within housing (312) of handpiece assembly (310) in this example. Rotation assembly (344) comprises a button (328) and a flange (334). As will be described in greater detail below, pressing button (328) will rotate flange (334), which will rotate the unit formed by acoustic assembly (316) and transmission assembly (314) relative to handpiece assembly (310).
[0046] As best seen in FIG. 6 , button (328) includes an integral shaft (332) and a pivoting pawl (346). Flange (334) is integrally secured about fore-bell (336) of transducer (306). In the present example, flange (334) is longitudinally positioned at a location corresponding to a node of the ultrasonic wave communicated through fore-bell (336). In some versions, flange (334) is secured to part of a rotary bearing that supports transducer (306) in housing (312). It should be understood that flange (334) may alternatively be located at other nodes or other locations. Flange (334) includes a plurality of teeth (348) that point in a generally counterclockwise direction. A gap (356) is positioned between each adjacent pair of teeth (348). Each gap (356) is configured to receive the tip (347) of pawl (346). As button (328) is pressed downwardly in direction (B), tip (347) remains in gap (356) and pushes against the adjacent tooth (348), thereby rotating flange (334) clockwise. With flange (334) being unitarily secured to fore-bell (336), this rotation of flange (334) rotates the unit formed by acoustic assembly (316) and transmission assembly (314) relative to handpiece assembly (310). A spring (352) biases shaft (332) upwardly, such that shaft (332) moves upwardly in direction (C) when button (328) is released. As shaft (332) travels upwardly, pawl (346) pivots about pin (358), riding along ramp surfaces (368) of teeth (348) without rotating flange (334). Once shaft (332) reaches an uppermost position, tip (347) of pawl (346) is again positioned in a gap (356) between teeth (348). A spring or other resilient member may bias pawl (346) to position tip (347) in a gap (356) between teeth (348) once shaft (332) reaches an uppermost position.
[0047] It should be understood from the foregoing that pawl (346) and flange (334) together form a ratchet assembly (350). It should also be understood that a user may repeatedly press and release button (328) to incrementally rotate the unit formed by acoustic assembly (316) and transmission assembly (314) relative to handpiece assembly (310). The increments may range from, for example, approximately 5 degrees to approximately 45 degrees of rotation per stroke or press of button (328). While flange (334) is directly coupled to fore-bell (336) in the present example by being coaxially secured about fore-bell (336), it should be understood that one or more gears or other components may be used to couple flange (334) with acoustic assembly (316). For instance, a gear train (not shown) may provide a mechanical advantage between ratchet assembly (350) and acoustic assembly (316). Such a mechanical advantage may provide a greater degree of rotation and/or greater rotational force each time button (328) is pressed. Various suitable ways in which ratchet assembly (350) may be coupled with acoustic assembly (316) will be apparent to those of ordinary skill in the art in view of the teachings herein.
[0048] It should be understood that ratchet assembly (350) of the present example permits rotation of the unit formed by acoustic assembly (316) and transmission assembly (314) relative to handpiece assembly (310) in only one direction. Ratchet assembly (350) may thus provide a mechanical ground when transmission assembly (313) is threadably coupled with acoustic assembly (316). In other words, ratchet assembly (350) may provide a torsional restraint against torque communicated using torque wrench (318).
[0049] In the present example, ratchet assembly (350) provides rotation of the unit formed by acoustic assembly (316) and transmission assembly (314) relative to handpiece assembly (310) when button (328) is pressed but not when button (328) is released. In some other versions, ratchet assembly (350) may provide rotation of the unit formed by acoustic assembly (316) and transmission assembly (314) relative to handpiece assembly (310) when button (328) is released but not when button (328) is pressed. For instance, such reverse operation may be provided by reversing the orientation of teeth (348) and by reversing the orientation of pawl (346).
[0050] In some versions, a passive pawl or catch (not shown) is provided on an opposite side of flange (334) to ensure that ratchet (334) does not rotate in a second, opposite direction, either when button (328) is released or otherwise. Such a catch may include a arm that is pivotally coupled relative to housing (312) and that has a free end received in gaps (356) between teeth (348). Such a catch may have an orientation similar to pawl (346), such that the catch rides along teeth (348) to permit flange (334) to rotate clockwise when button (328) is depressed; but prevents flange (334) from ever rotating counterclockwise. As another merely illustrative variation, ratchet (334) may be reversible to rotate in the second, opposite direction without interference by, for example, a passive pawl or catch.
[0051] As yet another merely illustrative variation, instrument (304) may include a pair of ratchet assemblies (350). For instance, one ratchet assembly (350) may provide rotation in one direction while the other ratchet assembly (350) provides rotation in the other direction. In some versions where a pair of ratchet assemblies (350) are included, a switch or clutch is also included to selectively activate one ratchet assembly (350) at a time.
[0052] It should be understood that any one or more of the teachings, expressions, embodiments, examples, etc. described herein may be combined with any one or more of the other teachings, expressions, embodiments, examples, etc. that are described herein. The following-described teachings, expressions, embodiments, examples, etc. should therefore not be viewed in isolation relative to each other. Various suitable ways in which the teachings herein may be combined will be readily apparent to those of ordinary skill in the art in view of the teachings herein. Such modifications and variations are intended to be included within the scope of the claims.
[0053] Versions of the devices described above may have application in conventional medical treatments and procedures conducted by a medical professional, as well as application in robotic-assisted medical treatments and procedures.
[0054] Versions of described above may be designed to be disposed of after a single use, or they can be designed to be used multiple times. Versions may, in either or both cases, be reconditioned for reuse after at least one use. Reconditioning may include any combination of the steps of disassembly of the device, followed by cleaning or replacement of particular pieces, and subsequent reassembly. In particular, some versions of the device may be disassembled, and any number of the particular pieces or parts of the device may be selectively replaced or removed in any combination. Upon cleaning and/or replacement of particular parts, some versions of the device may be reassembled for subsequent use either at a reconditioning facility, or by a user immediately prior to a procedure. Those skilled in the art will appreciate that reconditioning of a device may 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.
[0055] By way of example only, versions described herein may be sterilized before and/or after a procedure. In one sterilization technique, the device is placed in a closed and sealed container, such as a plastic or TYVEK bag. The container and device may then be placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, or high-energy electrons. The radiation may kill bacteria on the device and in the container. The sterilized device may then be stored in the sterile container for later use. A device may also be sterilized using any other technique known in the art, including but not limited to beta or gamma radiation, ethylene oxide, or steam.
[0056] Having shown and described various versions in the present disclosure, further adaptations of the methods and systems described herein may be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the present invention. Several of such potential modifications have been mentioned, and others will be apparent to those skilled in the art. For instance, the examples, versions, geometrics, materials, dimensions, ratios, steps, and the like discussed above are illustrative and are not required. Accordingly, the scope of the present invention should be considered in terms of the following claims and is understood not to be limited to the details of structure and operation shown and described in the specification and drawings.
Claims
I claim:
1. A surgical instrument comprising:
(a) a housing;
(b) an ultrasonic transducer;
(c) an acoustic transmission assembly attached to the transducer to form a rotatable unit, wherein the acoustic transmission assembly defines a longitudinal axis extending therethrough; and
(d) a rotation assembly, wherein the rotation assembly is operable to rotate the rotatable unit relative to the housing, wherein the rotation assembly comprises an input feature, wherein the input feature is configured to actuate relative to the housing along a linear path, wherein the rotation assembly is operable to convert linear motion of the input feature into rotation of the rotatable unit about the longitudinal axis of the acoustic transmission assembly, wherein the rotation assembly is operable to rotate the rotatable unit incrementally through a predetermined angular range in response to each linear actuation of the input feature.
2. The instrument of claim 1, wherein the rotation assembly comprises a ratchet and pawl assembly.
3. The instrument of claim 2, further comprising a toothed flange disposed about the transducer, wherein the toothed flange forms a ratchet of the ratchet and pawl assembly.
4. The instrument of claim 3, wherein the flange is unitarily secured to the transducer.
5. The instrument of claim 3, wherein the input feature comprises a button associated with a pivoting pawl, wherein the button is associated with the ratchet and pawl assembly, wherein the ratchet is configured to receive the pawl between teeth presented by the ratchet.
6. The instrument of claim 5, wherein the ratchet and pawl assembly is operable to rotate the rotatable unit in a first direction in response to actuation of the button.
7. The instrument of claim 6, wherein the button is biased to return to an original position upon removal of a pressing force.
8. The instrument of claim 6, wherein the pawl of the button is configured to be firmly received in a space defined between adjacent gear teeth of the ratchet upon removal of the pressing force.
9. The instrument of claim 1, wherein the transducer is coupled with a cable extending from the housing.
10. The instrument of claim 9, wherein the transducer is coupled with the cable via one or more slip rings.
11. The instrument of claim 9, further comprising a generator, wherein the cable is coupled with the generator.
12. A surgical instrument comprising:
(a) a housing;
(b) an acoustic transmission assembly, wherein the acoustic transmission assembly comprises a shaft extending distally relative to the housing, wherein the acoustic transmission assembly includes an end effector in communication with the shaft, wherein the shaft defines a longitudinal axis extending therethrough;
(c) a transducer coupled with the acoustic transmission assembly, wherein the acoustic transmission assembly is operable to communicate ultrasonic vibrations from the transducer such that the transducer and the acoustic transmission assembly together define an acoustic assembly; and
(d) a pawl and ratchet rotation assembly communicating with the acoustic transmission assembly, wherein the pawl and ratchet rotation assembly is operable to rotate the acoustic assembly about the longitudinal axis of the shaft, wherein the pawl and ratchet rotation assembly is operable to convert a discrete linear input motion into a corresponding discrete angular rotation of the acoustic assembly.
13. The surgical instrument of claim 12, wherein the end effector includes an ultrasonic blade.
14. The surgical instrument of claim 12, wherein the housing is configured to be handheld.
15. A surgical instrument comprising:
(a) a housing;
(b) an ultrasonic transducer;
(c) an acoustic transmission assembly coupled with the transducer, wherein the ultrasonic transducer and the acoustic transmission assembly together form a rotatable unit, wherein the acoustic transmission assembly comprises:
(i) a shaft portion extending distally from the housing, wherein the shaft portion defines a longitudinal axis, and
(ii) an end effector, wherein the end effector includes an ultrasonic blade; and
(d) a rotation assembly, wherein the rotation assembly is operable to rotate the rotatable unit about the longitudinal axis of the shaft portion and relative to the housing in a first direction, wherein the rotation assembly is operable to prevent rotation of the rotatable unit about the longitudinal axis of the shaft portion in a second direction, wherein the rotation assembly includes a rotatable member and an input member, wherein the input member includes a pivotable engagement protrusion, wherein the engagement protrusion is configured to pivot between an engagement position and a disengagement position, wherein the engagement protrusion is operable to engage the rotatable member when in the engagement position to thereby drive the rotatable unit to rotate in the first direction.
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