|Publication number||US20060185682 A1|
|Application number||US 11/410,861|
|Publication date||24 Aug 2006|
|Filing date||24 Apr 2006|
|Priority date||17 Feb 2004|
|Also published as||DE602005000938D1, DE602005000938T2, EP1563794A1, EP1563794B1, US7097089, US20050184125|
|Publication number||11410861, 410861, US 2006/0185682 A1, US 2006/185682 A1, US 20060185682 A1, US 20060185682A1, US 2006185682 A1, US 2006185682A1, US-A1-20060185682, US-A1-2006185682, US2006/0185682A1, US2006/185682A1, US20060185682 A1, US20060185682A1, US2006185682 A1, US2006185682A1|
|Original Assignee||Tyco Healthcare Group Lp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (78), Referenced by (36), Classifications (11), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present application claims the benefit of and priority to U.S. Provisional Application Ser. No. 60/545,621, filed Feb. 17, 2004, the entire content of which being incorporated herein by reference.
1. Technical Field
The present disclosure relates to a surgical apparatus, e.g., a surgical stapling apparatus. More particularly, the present disclosure relates to an endoscopic surgical stapling apparatus that includes a locking mechanism for retaining the drive assembly of a loading unit, e.g., a single use loading unit (“SULU”) or disposable loading unit (“DLU”), at a substantially fixed axial position until the SULU or DLU has been loaded with or secured to a surgical stapling apparatus, to ensure proper or complete engagement of the SULU or DLU, especially its drive assembly, to the surgical stapling apparatus. For simplicity, hereinafter, SULU or DLU will be referred to as “DLU”, but it should be understood to include either or both a DLU or SULU.
2. Background of Related Art
Surgical devices wherein tissue is first grasped or clamped between opposing jaw structure and then joined by surgical fasteners are well known in the art. In some instruments a knife is provided to cut the tissue which has been joined by the fasteners. The fasteners are typically in the form of surgical staples but two part polymeric fasteners can also be utilized.
Instruments for this purpose can include two elongated jaw members which are respectively used to capture or clamp tissue. Typically, one of the jaw members carries a staple cartridge which houses a plurality of staples arranged in at least two lateral rows while the other jaw member has an anvil that defines a surface for forming the staple legs as the staples are driven from the staple cartridge. Generally, the stapling operation is effected by cam members that travel longitudinally through the staple cartridge, with the cam members acting upon staple pushers to sequentially eject the staples from the staple cartridge. A knife can travel between the staple rows to longitudinally cut and/or open the stapled tissue between the rows of staples. Such instruments are disclosed, for example, in U.S. Pat. No. 3,079,606 and U.S. Pat. No. 3,490,675.
A later stapler disclosed in U.S. Pat. No. 3,499,591 also applies a double row of staples on each side of the incision. This patent discloses a surgical stapler that has a disposable loading unit in which a cam member moves through an elongate guide path between two sets of staggered staple carrying grooves. Staple drive members are located within the grooves and are positioned in such a manner so as to be contacted by the longitudinally moving cam member to effect ejection of the staples from the staple cartridge of the disposable loading unit. Other examples of such staplers are disclosed in U.S. Pat. Nos. 4,429,695 and 5,065,929.
Each of the instruments described above is designed for use in conventional surgical procedures wherein surgeons have direct manual access to the operative site. However, in endoscopic or laparoscopic procedures, surgery is performed through a small incision or through a narrow cannula inserted through small entrance wounds in the skin. In order to address the specific needs of endoscopic and/or laparoscopic surgical procedures, endoscopic surgical stapling devices have been developed and are disclosed in, for example, U.S. Pat. No. 5,040,715 (Green, et al.); U.S. Pat. No. 5,307,976 (Olson, et al.); U.S. Pat. No. 5,312,023 (Green, et al.); U.S. Pat. No. 5,318,221 (Green, et al.); U.S. Pat. No. 5,326,013 (Green, et al.); U.S. Pat. No. 5,332,142 (Robinson, et al.); and U.S. Pat. No. 6,241,139 (Milliman et al.), the entire contents of each of which are incorporated herein by reference.
Tyco Healthcare Group, LP, the assignee of the present application, has manufactured and marketed endoscopic stapling instruments, such as the Multifire ENDO GIA™ 30 and Multifire ENDO GIA™ 60 instruments, for a number of years. These instruments include a surgical stapling apparatus and a DLU. Typically, the DLU is attached to the apparatus immediately prior to surgery. After use, the DLU can be removed from the apparatus and a new DLU can be fastened to the apparatus to perform additional stapling and/or cutting operations. These instruments have provided significant clinical benefits. Nonetheless, improvements to these instruments are still possible.
It would be desirable to provide an improved DLU for a surgical stapling apparatus and an improved surgical stapling apparatus having the DLU loaded thereon.
It would also be desirable to provide a locking member for a DLU to assure proper loading of the DLU to the shaft of a surgical stapling apparatus.
Accordingly, it is an object of this disclosure to provide an improved DLU which locks or retains its drive assembly in proper position to be loaded onto the shaft of a surgical stapling apparatus (hereinafter referred to as the or a “ready-to-load position”) until the DLU is loaded onto a surgical stapling apparatus to assure that when the DLU is loaded thereto, the drive assembly is properly engaged by, coupled to or connected to a drive member of the shaft, thereby helping to ensure proper operation of the DLU and the surgical stapling apparatus. For example, with the DLU loaded onto the surgical stapling apparatus, after firing of the surgical stapling apparatus, retraction of the control rod will unapproximate or open and/or unclamp the anvil and cartridge assemblies.
An object of the disclosure is to provide an improved DLU that includes a locking mechanism that retains the drive assembly in such a ready-to-load position until the DLU is loaded onto the surgical stapling apparatus.
Another object of the disclosure is to provide such a locking mechanism for a DLU.
Another object of the present disclosure is to provide a locking mechanism for a DLU and a DLU having a locking mechanism, such that firing of the surgical stapling apparatus is prevented unless and until the DLU is loaded onto the shaft of the surgical stapling apparatus.
Yet another object of the disclosure is to provide a DLU that, after firing, can be disconnected from the surgical stapling apparatus.
Yet another object of the disclosure is to provide a DLU that has only two conditions, one in which it is not loaded and its drive assembly is locked or retained in the ready-to-load position, and another in which the DLU is loaded onto the shaft of a surgical stapling apparatus and in which the drive assembly is unlocked and free to be actuated.
Still another object of the present disclosure is to provide the above objects in a roticulating, i.e., roticulable, DLU.
In accordance with the present disclosure, a surgical apparatus, e.g., a surgical stapling apparatus, including a locking mechanism for ensuring proper engagement of a disposable loading unit to an end of the surgical apparatus is provided. According to one aspect of the present disclosure the surgical apparatus includes a housing, a handle supported by the housing, and a loading unit supportable on a distal end of the housing. The loading unit includes a housing portion including a distal end and a proximal end, a drive assembly slidably supported within the housing portion of the loading unit, and a locking mechanism supported on the housing portion of the loading unit. The locking mechanism has a first position in which the locking mechanism engages the drive assembly and maintains the position of the drive assembly in a ready-to-load position relative to the housing portion of the loading unit. The locking mechanism is movable, preferably pivotable in a plane substantially tangential to an outer surface of the housing portion, to a second position in which the locking mechanism disengages the drive assembly and enables the drive assembly to move relative to the housing portion.
Preferably, the locking mechanism includes a lever having a distal end pivotably connected to the housing portion and a free proximal end, and a tooth extending radially inward from the lever. Desirably, the tooth selectively engages an engagement surface, e.g., a notch, formed in, on or of the drive assembly such that when the locking mechanism is in the first position the tooth engages the engagement surface of the drive assembly, and when the locking mechanism is in the second position the tooth is disengaged from the engagement surface of the drive assembly.
It is envisioned that when the locking mechanism is urged from the first position to the second position, the lever is pivoted about the distal end thereof such that a longitudinal axis of the lever is angled with respect to a longitudinal axis of the housing portion. The locking mechanism is preferably urged from the first position to the second position by a projection extending radially inward of the elongate body. Desirably, the projection acts on a side surface of the lever as the loading unit is twisted into loaded engagement in the elongate body.
Preferably, when the locking mechanism is in the first position the lever is substantially axially aligned with a nub extending radially outward from the proximal end of the housing and when the locking mechanism is in the second position the lever is out of axial alignment with the nub of the proximal end of the housing.
The proximal end of the lever can include a nub extending preferably radially toward, the proximal end of the housing. The proximal end of the housing preferably includes a recess formed in the surface thereof for receipt of the lever nub of the lever when the lever is in the first position.
The locking mechanism can further include a biasing member operatively associated therewith, wherein the biasing member tends to maintain the lever in the first position.
Preferably, the surgical apparatus is a fastener applier or stapler, preferably a laparoscopic or endoscopic stapler.
This disclosure also is of a DLU, preferably a roticulator DLU for a surgical fastener applier or stapler.
The surgical apparatus may further include an elongate body extending from the housing.
It is further envisioned that the proximal end of the housing portion of the loading unit may define an insertion tip.
The present disclosure further provides for a loading unit for use with and/or supportable on a distal end of a surgical stapling apparatus. The loading unit includes a housing portion including a distal end and a proximal end, a drive assembly slidably supported within the housing portion of the loading unit, and a locking mechanism supported on the housing portion of the loading unit. The locking mechanism has a first position wherein the locking mechanism engages the drive assembly and maintains the position of the drive assembly in a ready-to-load position relative to the housing portion of the loading unit. The locking mechanism is pivotable, in a plane substantially tangential to an outer surface of the housing portion, to a second position wherein the locking mechanism disengages the drive assembly and enables the drive assembly to move relative to the housing portion.
Additional advantages will become apparent from the description which follows, taken in conjunction with the accompanying drawings.
The present disclosure will be further described with reference to the accompanying drawings, wherein like reference numerals refer to like parts in the several views, and wherein:
Preferred embodiments of the presently disclosed surgical apparatus, DLU and locking mechanism or member will now be described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views.
In the drawings and in the description that follows, the term “proximal”, as is traditional, will refer to the end of the stapling apparatus which is closest to the operator, while the term “distal” will refer to the end of the apparatus which is furthest from the operator.
Surgical stapling apparatus 10 is an endoscopic apparatus and includes a handle assembly 12 and an elongated body 14 extending from handle assembly 12. A DLU 16 is releasably secured to the distal end of elongated body 14. While this disclosure relates to the use of a DLU with surgical stapling apparatus 10, it is understood and within the scope of the present disclosure that a single use loading unit (SULU) or other end effector and/or tool assembly can equally be used in cooperation with surgical stapling apparatus 10.
DLU 16 includes a tool assembly 17 having a cartridge assembly 18 housing a plurality of surgical staples (not shown) and an anvil assembly 20 movably secured in relation to cartridge assembly 18. As shown herein, DLU 16 is configured to apply six (6) linear rows of staples, each row in the DLU's measuring from about 30 mm to about 60 mm in length. DLUs for applying any number of rows of staples, having staple pockets arranged in various patterns and/or DLUs and end effectors having any other lengths, e.g., 45 mm, are also envisioned. Handle assembly 12 includes a stationary handle member 22, a movable handle member 24, and a barrel portion 26.
A rotatable member 28 preferably is mounted on the forward end of barrel portion 26 to facilitate rotation of elongated body 14 and attached DLU 16 with respect to handle assembly 12. An articulation lever 30 preferably is also mounted on the forward end of barrel portion 26 adjacent rotatable member 28 to facilitate articulation of tool assembly 17. Preferably, a pair of knobs 32 are movably positioned along barrel portion 26. Knobs 32 are advanced distally to approximate or close cartridge and/or anvil assembly 18, 20, and retracted proximally to unapproximate or open cartridge and/or anvil assembly 18, 20.
As seen in
With reference to
Upper housing half 250 and lower housing half 252 are contained within an outer sleeve, shell or casing 251. The proximal end of upper housing half 250 includes an insertion tip 193 extending proximally therefrom. Insertion tip 193 includes engagement nubs 254, preferably a pair of diametrically opposed engagement nubs 254, extending radially outwardly therefrom, for releasably engaging the distal end of body 14. Nubs 254 form a bayonet-type coupling with the distal end of body 14. Housing halves 252 and 254 define a channel 400 for slidably receiving axial drive assembly 212 therein. An articulation link 256 is dimensioned to be slidably positioned within a slot 402 formed in upper and lower housing halves 250, 252. A pair of blow out plate assemblies 255 are positioned adjacent the distal end of housing portion 200 adjacent the distal end of axial drive assembly 212 to prevent outward buckling and bulging of drive assembly 212 during articulation and firing of surgical stapling apparatus 10. For a detailed discussion of the structure and operation of blow out plate assemblies 255, reference is made to International Application Serial No. PCT/US02/32031, filed on Oct. 4, 2002, entitled “Surgical Stapling Device”, the entire content of which is herein incorporated by reference.
With reference to
As seen in
In use, as best seen in
When locking mechanism 300 is in the second position, DLU is considered loaded onto ad/or into elongate body 14 of surgical stapling apparatus 10. Thus, drive assembly 212 is free to be actuated and reciprocated axially by drive rod 52 to perform its operative functions of approximating and closing anvil and cartridge assemblies 18, 20, driving knife 280 and firing staples, as well as of un-approximating, un-clamping, and retracting drive assembly 212. DLU 16 is considered to be loaded to elongate body 14 when locking mechanism 300 is in the second position, i.e., when drive assembly 212 is connected to control rod 52 of elongate body 14.
With continued reference to
Preferably, insertion tip 193 includes a recessed area 193 b (
With continued reference to
When nubs 254 have reached slots 276 e, and when insertion tip 193 has been fully inserted into the distal end of elongate body 14, DLU 16 is rotated, in the direction of arrow “B” (see
As can be appreciated, if lever 302 has been inadvertently moved to the second position, prior to coupling of DLU 16 to elongate body 14, and drive assembly 212 has prematurely moved from its proximal-most or ready-to-load position, lever 302 can not move to the first position since tooth 310 is not aligned with drive assembly 212 and can not pass in front of shoulder 270 c. In such a situation, tooth 310 will abut against a portion of engagement section 270 to prevent lever 302 from returning to the first position. Thus, upon insertion of DLU 16 into elongate body 14, proximal end 306 of lever 302 will abut against and/or otherwise contact projection 276 c of elongate body 14 and thus prevent loading of DLU 16 to elongate body 14.
Accordingly, the attachment of a DLU having a drive assembly which is not in its proximal-most or ready-to-load position is prevented.
It will be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be construed as limiting, but merely as exemplifications of preferred embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the claims appended hereto.
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|International Classification||A61B17/072, A61B17/00, A61B19/00, A61B17/04|
|Cooperative Classification||A61B2017/00473, A61B17/07207, A61B2017/07214, A61B2017/320052, A61B2017/00477|
|24 Apr 2006||AS||Assignment|
Owner name: TYCO HEALTHCARE GROUP LP, CONNECTICUT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MARCZYK, STANISLAW;REEL/FRAME:017824/0661
Effective date: 20050421