|Publication number||USRE40514 E1|
|Application number||US 11/311,887|
|Publication date||23 Sep 2008|
|Filing date||19 Dec 2005|
|Priority date||28 Aug 1995|
|Also published as||US5762256, US6986451, US7044353, US7128253, US7225964, US7258262, US7278562, US7308998, US20050127131, US20060043147, US20060201990, US20060201991, US20070045380, US20070114262|
|Publication number||11311887, 311887, US RE40514 E1, US RE40514E1, US-E1-RE40514, USRE40514 E1, USRE40514E1|
|Inventors||Dominick L. Mastri, Frank J. Viola, Thomas W. Alesi, Jr., Robert J. Geiste, Jon Wilson|
|Original Assignee||United States Surgical Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (99), Referenced by (133), Classifications (21), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation-in-part of application Ser. No. 08/520,202 filed Aug. 28, 1995, now U.S. Pat. No. 5,762,256. This application is a continuation of application Ser. No. 08/546,253, filed Oct. 20, 1995, now U.S. Pat. No. 5,782,396, which is a continuation-in-part of application Ser. No. 08/520,202, filed Aug. 28, 1995, now U.S. Pat. No. 5,762,256.
1. Technical Field
This application relates to a surgical stapling apparatus, and more particularly, to an apparatus for sequentially applying a plurality of surgical-fasteners to body tissue and optionally incising the fastened tissue.
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 members which are respectively used to capture or clamp tissue. Typically, one of the members carries a staple cartridge which houses a plurality of staples arranged in at least two lateral rows while the other 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 bars that travel longitudinally through the staple cartridge, with the cam bars 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. Nos. 3,079,606 and 3,490,675.
A later stapler disclosed in U.S. Pat. No. 3,499,591 applies a double row of staples on each side of the incision. This is accomplished by providing 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 that are positioned in such a manner so as to be contacted by the longitudinally moving cam 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 were 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.); and U.S. Pat. No. 5,332,142 (Robinson, et al.).
U.S. Surgical, 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 several years. These instruments have provided significant clinical benefits. Nonetheless, improvements are possible, for example, by reducing the cost and complexity of manufacture.
Current laparoscopic linear stapling devices are configured to operate with disposable loading units (U.S. Surgical) and staple cartridges (Ethicon) of only one size. For example, individual linear staplers are presently available for applying parallel rows of staples measuring 30 mm, 45 mm and 60 mm in length. Thus, during a normal operation, a surgeon may be required to utilize several different stapling instruments to perform a single laparoscopic surgical procedure. Such practices increase the time, complexity and overall costs associated with laparoscopic surgical procedures. In addition, costs are greater in designing and manufacturing multiple stapler sizes, as opposed to creating a single, multipurpose stapler.
It would be extremely beneficial to provide a surgical device for use during laparoscopic and/or endoscopic surgical procedures that can be employed with several different sized disposable loading units to reduce the overall costs associated with such procedures. It would also be particularly beneficial if the device could perform multiple tasks, using disposable loading units of varying size and of varying purpose, such as, for example, to staple, clip and/or cut.
In making improvements or modifications to the current instruments, it would be highly desirable not to sacrifice any of the important benefits of the MULTIFIRE ENDO GIA* 30 and 60 instruments as compared to other commercially available products, e.g., the endoscopic stapling instruments manufactured and marketed by Ethicon, Inc. For example, any improvement should advantageously provide a fresh knife blade for each firing of the instrument and ensure that the disposable loading unit is securely retained in the stapling instrument unless and until the operating team chooses to remove it. These advantages have historically been found in the U.S. Surgical instruments, but not in the Ethicon instruments.
Therefore, a need exits for a reliable surgical stapler and disposable loading units for use therewith that exhibit all of the benefits of the present assignee's commercially available instruments while also reducing the cost and complexity of manufacture.
The subject application is primarily directed to a stapling device for applying parallel rows of surgical fasteners to body tissue and, preferably, one that concomitantly forms an incision between the rows of staples during an endoscopic or laparoscopic surgical procedure. A particularly unique feature of the stapling device described herein is that it can be employed with a number of different disposable loading units. Moreover, the stapling device of the subject application can be utilized with disposable loading units configured to apply linear rows of staples measuring from about 15 mm in length to about 60 mm in length.
In a preferred embodiment of the subject surgical stapler, the device includes a handle assembly including an elongated barrel portion and an actuation handle movable through an actuating stroke, and an elongated body extending distally from the barrel portion of the handle assembly and defining a longitudinal axis. An elongated actuation shaft is supported at least in part within the barrel portion of the handle assembly and it has a particular linear dimension. The actuation handle interacts with the actuation shaft such that manipulation of the actuation handle through a complete actuating stroke causes the actuation shaft to translate through a predetermined linear distance.
A disposable loading unit is operatively engaged in a distal portion of the elongated body. The disposable loading unit preferably includes a carrier, a staple cartridge containing a plurality of staples, an actuator (movable through the housing and staple cartridge) and an anvil. The instrument actuation shaft drives the actuator through the staple cartridge to eject the staples against the anvil to form a staple line having a particular linear dimension. Preferably, the linear dimension of the staple line corresponds to the distance through which the actuation shaft translates in response to manipulation of the actuation handle through a particular number of complete or partial actuation strokes numbering more than one complete stroke.
The actuation shaft is preferably defined at least in part by a toothed rack having a particular rack length, and the actuation handle has a pawl member for selectively engaging the toothed rack and advancing the actuation shaft in response to manipulation of the actuation handle. When a disposable loading unit having linear rows of staples is used, the linear dimension of the staple line applied by the stapling unit is preferably proportional to the longitudinal travel of the actuation shaft. In a most preferred embodiment, the minimum linear dimension of the staple line will always be greater than the maximum linear distance through which the actuation shaft translates in response to a complete actuation stroke.
When a disposable loading unit having an anvil is used, the actuation handle is preferably movable through a clamping stroke in which the actuation shaft translates through a predetermined clamping distance to move the anvil from an open position to a closed position. The clamping stroke precedes the first of any number of complete or partial actuation strokes. In a preferred embodiment, an engagement hook is mounted within the barrel portion of the handle assembly to selectively maintain the actuation shaft in a particular position after traveling through the clamping distance and a notch is defined in a distal end portion of the actuation shaft, distal of the toothed rack, for receiving and releasably retaining the engagement hook.
In use of a preferred embodiment, movement of the actuation handle in a direction opposite the clamping stroke causes the engagement hook to release the actuation shaft, permitting the anvil to move to an open position. A lift finger is provided on a flange extending from the actuation handle and is positioned to move the engagement hook out of engagement with the notch when the actuation handle is moved in a direction opposite the clamping stroke. Preferably, a first biasing spring is provided within the handle assembly for biasing the actuation handle in a clockwise direction and a second biasing spring is provided within the handle assembly for biasing the actuation handle in a counter-clockwise direction, about a handle pivot point. The counter-clockwise direction corresponds to the direction of the clamping and actuating strokes.
The engagement hook is preferably configured to interact with the toothed rack to maintain the actuation shaft in a particular linear position during an actuation stroke, and it is normally biased into engagement with the actuation shaft. An abutment strut or beam is operatively associated with a proximal end portion of the stapler body for maintaining the engagement hook in a position out of engagement with the actuation shaft until a disposable loading unit is operatively engaged in a distal end portion of the elongated body. The abutment strut permits the engagement hook to engage the actuation shaft after a disposable loading unit has been operatively engaged in a distal end portion of the elongated instrument body.
In another preferred embodiment of the surgical stapling apparatus disclosed herein, a release mechanism is operatively associated with the handle assembly for effectuating the manual disengagement of the engagement hook from the actuation shaft to permit subsequent distal advancement of the actuation shaft in response to manipulation of the actuation handle through any number of subsequent stapling strokes. In addition, a retracting mechanism is operatively associated with the handle assembly for effectuating the manual retraction of the actuation shaft at any point in the actuating stroke so that the actuator can be withdrawn to permit the anvil to move from a closed position to an open position.
In a preferred embodiment of the device described herein, the disposable loading unit is a adapted to apply linear rows of staples and includes: a carrier having a proximal end portion including a coupling for releasable engagement in a distal end portion of the elongated instrument body; an elongate staple cartridge supported in the carrier and containing a plurality of surgical fasteners and a plurality of fastener pushers for ejecting the fasteners from the staple cartridge; an actuator for contacting the fastener pushers; and an anvil supported on the carrier and mounted for movement with respect to the staple cartridge between an open position and a closed position. The anvil preferably has a fastener forming surface against which the surgical fasteners are driven when ejected from the staple cartridge by the fastener pushers, and a camming surface opposite the fastener forming surface. The actuator is preferably wedged actuator that translates through the staple cartridge to sequentially interact with the fastener pushers to eject the fasteners from the staple cartridge.
The disposable loading unit further preferably includes an elongated drive beam having a proximal engagement portion, a distal working end portion having an abutment surface and a camming member. The proximal engagement portion is configured to mate with a distal end portion of the actuation assembly of the stapler while the abutment surface engages the actuator to eject staples from the staple cartridge during firing. The camming member contacts the camming surface of the anvil during firing. In use, the stapler actuation assembly moves the drive beam through the carrier causing the camming member to close the anvil or maintain the anvil closed as it substantially simultaneously causes the actuator to translate through the staple cartridge, thereby sequentially interacting with the plurality of fastener pushers to fire the staples.
Preferably, the camming member is defined by a cylindrical cam roller mounted on a flange extending from the distal working end portion of the drive beam. A longitudinal slot is defined in the anvil to accommodate the linear translation of the working end portion of the drive beam, and a transverse support flange is operatively mounted on the working end portion opposite the cam roller to engage an undersurface of the carrier as the cam roller engages the camming surface of the anvil. A longitudinal slot is also defined in the undersurface of the carrier to accommodate the linear translation of the working end portion of the drive beam. An optional anvil cover can be provided to ensure tissue is not inadvertently contacted by the drive beam or cam roller during firing.
Preferably, a knife blade is operatively supported adjacent a leading edge of the working end portion of the drive beam for forming an incision in stapled body tissue. Also, the actuator is preferably a sled including a planar base portion and a plurality of spaced apart upstanding cam wedges each having an inclined leading edge for interacting with the fastener pushers within the staple cartridge.
In a preferred embodiment of the stapling device described herein, the distal end portion of the elongated body and the proximal portion of the carrier includes cooperating portions of a bayonet-type coupling. The coupling facilitates the convenient removal and engagement of a variety of different sized disposable loading units including those which are configured to apply staple rows that are approximately 30 mm in length, 45 mm in length, and 60 mm in length. Accordingly, it is envisioned that the device can be sold and marketed as a kit which would include at least one surgical instrument designed to actuate compatible disposable loading units and a plurality of disposable loading units that can vary in size and type. The disposable loading units can be adapted to apply linear rows of staples, clips or other forms of fasteners. A common feature of these disposable loading units is that they utilize the longitudinal motion of the instrument actuation control rod to apply the fasteners.
These and other features of the surgical stapling device of the subject application will become more readily apparent to those skilled in the art from the following detailed description of the preferred embodiments of the device taken in conjunction with the drawings.
Various embodiments of the surgical stapling apparatus of the subject application will be described hereinbelow with reference to the drawings wherein:
In the drawings and in the description which 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.
Referring now to the drawings wherein like reference numerals identify similar structural elements of the subject invention, there is illustrated in
Surgical apparatus 10 is unique among laparoscopic devices known in the art because it can employ a plurality of different sized disposable loading units. Moreover, apparatus 10 is preferably configured to operate with individual disposable loading units that apply linear rows of staples measuring 30 mm, 45 mm, or 60 mm in length (
As illustrated in
Actuation handle 26 controls the linear movement of actuation shaft 40 which is mounted within barrel portion 22. More particularly, actuation shaft 40 has a toothed rack 42 defined thereon, and actuation handle 26 has a ratcheting pawl 44 mounted thereto for incrementally engaging and advancing actuation shaft 40. Pawl 44 is mounted on a pivot pin 46 and a coiled torsion spring 48 biases the pawl into engagement with toothed rack 42. A linear biasing strut 50 is supported within barrel portion 22 and is biased distally by a coiled compression spring 52 to bias the pawl, and hence the actuation handle, against clockwise rotation about pivot pin 28. Biasing strut 50 also serves to act on an angled rear cam surface on pawl 44 wherein contact of the cam surface with strut 50 causes pawl 44 to rotate clockwise (away from rack 42). When the instrument is at rest, pawl 44 is biased away from the toothed rack 42. When actuation handle 26 is pulled proximally, pawl 44 moves away from strut 50 and rotates counterclockwise and engages the teeth of actuation shaft 40, thereby allowing actuation handle 26 to drive the shaft distally.
Actuation shaft 40 is normally biased in a proximal direction within barrel portion 22 by a constant force spring 54 which is mounted to the actuation shaft adjacent the distal end thereof by conventional fastening means known in the art. Constant force spring 54 is supported on a boss 56 provided within the housing 22 of handle assembly 12. The distal end portion of actuation shaft 40 has a cavity 58 defined in an undersurface thereof for engaging and retaining the flanged proximal end 62 of control rod 64. Control rod 64 extends coaxially through the elongated body 14 of surgical stapler 10 to interact with a disposable loading unit at a distal end thereof. Thus, linear advancement of actuation shaft 40 in response to manipulation of actuation handle 26 causes corresponding longitudinal movement of control rod 64, and, as will be discussed in detail hereinbelow, actuation of an associated disposable loading unit.
With continuing reference to
Within handle assembly 12, there is also contained a mechanism for initiating the engagement between a rack lock 80 and the toothed rack 42 of actuation shaft 40. Rack lock 80 maintains the longitudinal position of actuation shaft 40 under the bias of constant force spring 54. Rack lock 80 will not engage the rack unless and until a disposable loading unit is operatively engaged in the distal end portion of portion body 14. This mechanism is illustrated in FIG. 2 and its interaction with rack lock 80 is best understood by also referring to
As best seen in
Referring now to
A coupling stem 128 projects radially outwardly from end section 126 for interacting with the J-shaped coupling slot 130 defined in the wall of the distal end portion of elongated body 14 (see FIGS. 4 and 5). Stem 128 and slot 130 together define a conventional bayonet-type coupling which facilitates quick and easy engagement and removal of the stapling unit from the stapler during a surgical procedure. Once engaged in the distal end portion of stapler elongated 14, the distal end of support tube 88 urges proximal end section 126 distally under the bias of coiled spring 92, thereby maintaining the coupling stem 128 within coupling slot 130.
With continuing reference to
A plurality of spaced apart longitudinal slots 142 extend through staple cartridge 34 to accommodate the upstanding cam edges 144 of actuation sled 140. Slots 142 communicate with a plurality of transverse retention slots 146 within which the plurality of fasteners 132 and pushers 134 are respectively supported. During operation, as actuation sled 140 translates through staple cartridge 34, the angled leading edges of cam wedges 144 sequentially contact pushers 136, causing the pushers to translate vertically within slots 146, urging the fasteners 134 therefrom. The result of the interaction between actuation sled 140 and pushers 136 is illustrated in
With continuing reference to
Disposable loading unit 30 further includes an axial drive assembly 160 for transmitting the longitudinal drive forces exerted by control rod 64 to actuation slot 140 during a stapling procedure. Drive assembly 160 includes an elongated drive beam 162 including a distal working head 164 and a proximal engagement section 166. Engagement section 166 includes a pair of engagement fingers 166a and 166b which are dimensioned and configured to mountingly engage a pair of corresponding retention slots 168a and 168b formed in a drive block 168. Drive block 168 has a proximal porthole 170 for receiving the distal end of control rod 64 when the proximal end of stapling unit 30 is inserted into the distal end of stapler body 14. Drive block 168 can be provided with an internal slot to receive a stem (not shown) from a distal end of control rod 64 to form a bayonet type connection, similar to that shown in connecting elongated body 14 to coupling stem 128. Such a connection would enable the user to manipulate drive beam 162 upon movement of control rod 64. The working end 164 of drive beam 162 is defined by a vertical support strut 172 which supports a knife blade 174, and an abutment surface 176 which engages the central support wedge 145 of actuation sled 140. Knife blade 174 travels slightly behind actuation sled 140 during a stapling procedure to form an incision between the rows of staple body tissue. A retention flange 178 projects distally from vertical strut 172 to retain a cylindrical cam roller 180. Cam roller 180 is dimensioned and configured to engage and translate with respect to the exterior camming surface 182 of anvil 36 to progressively clamp the anvil against body tissue during firing.
A longitudinal slot 184 extends through anvil 36 to accommodate the translation of retention flange 178 and vertical strut 172. A balancing flange 186 is secured to the working end of drive beam 162 through the engagement of retention foot 188 within a complementary retention port 190 formed in flange 186. Flange 186 serves to balance the clamping forces generated by cam roller 180 as anvil 36 is progressively clamped. A longitudinal slot 192 is formed in the base 112 of channel 110 to accommodate the longitudinal translation of retention foot 188 during firing.
With reference to disposable loading unit 45 in
Referring now in sequential order to
Once the proximal end of the disposable loading unit is inserted into the distal end of elongated body 14, it is rotated approximately 10° to 15° to position coupling stem 128 in the base of coupling slot 130. Thereupon, the bias of spring 92 urges support tube 80 distally to lock stem 128 within the base of slot 130. If a coupling system is provided between control rod 64 and drive block 168 (discussed above) such rotation would couple these member as well. In addition, as illustrated in
Prior to manipulating actuation hook 26, actuation shaft 40 is in its proximal-most position, as is control rod 64, biased against distal movement by constant force spring 54. Accordingly, anvil 36 is in an open position biased against closure by spring arms 158a and 158b. Thus, at such a time, body tissue such as tubular vessel 200 may be captured between the fastener forming surface of anvil 36 and the tissue contacting surface of staple cartridge 34.
Turning now to
Under certain circumstances it may be necessary to open the anvil and unclamp the captured vessel or body tissue, i.e., to recapture the vessel at a different location. As illustrated in
To complete the staple firing operation, actuation handle 26 is once again approximated toward stationary handle 24, causing pawl 44 to engage toothed rack 42 and advance actuation shaft 40 in a distal direction another 15 mm. Thus, two complete strokes of actuation handle 26 causes actuation shaft 40 to advance 30 mm within barrel portion 22, urging the working end 164 to drive beam 162 through staple cartridge 34 to sequentially eject all of the surgical fasteners therefrom. If desired, the operator can incrementally advance control shaft 64 by multiple short strokes, wherein the minimum advancement is dictated by the linear distance between the teeth on rack 42. Therefore, while two complete strokes of the preferred stroke distance of 15 mm can be used (to fire a 30 mm disposable loading unit), complete strokes are not necessary or required.
As best seen in
At the conclusion of the above-described firing operation, disposable loading unit 30 is removed from the distal end of elongated body 14, as illustrated in FIG. 11. At such a time, support tube 88 is permitted to return to its distal-most position under the bias of spring 92. Accordingly, beam 82 translates distally causing arcuate cam finger 96 to lift rack lock 80 out of engagement with the toothed rack 42 of actuation shaft 40. As a result, actuation shaft 40 returns to its proximal-most position within barrel portion 22 under the bias of constant force spring 54. Thereupon, a new disposable loading unit can be joined with the instrument and another surgical task performed.
If the surgeon desires to apply parallel rows of staples each measuring about 45 mm in length, disposable loading unit 45 (
It is readily apparent and may be appreciated by those having ordinary skill in the art that the stroke distance travelled by the actuation shaft may be adjusted in accordance with desired surgical practices. For example, it may be desirable to employ disposable loading units which apply parallel staple rows measuring 40 mm, 60 mm, or 80 mm. Thus, the incremental stroke distance travelled by the actuation shaft could be adjusted to approximately 20 mm intervals. In addition, one skilled in the art could provide alternate structure or orientation of structures to control the advancement of control rod 64. For example, toothed rack 42 could be rotated so the teeth face downward towards the handles and the locks and pawls moved to engage the rack from the underside. Also, various safety mechanisms can be added, such as a lockout in the handle that needs to be released prior to actually firing a disposable loading unit. These and other features are described in greater detail, below.
Referring now to
As illustrated in
Actuation shaft 540 is normally biased in a proximal direction within barrel portion 522 by a constant force spring 554 which is supported on a boss 556 provided within housing 520. A notched area 555 is formed in the upper surface of actuation shaft 540 adjacent the proximal end thereof for receiving and retaining an engagement tab 557 provided at the free end of constant force spring 554. The distal end of actuation shaft 540 is provided with a catchment fitting 558 for engaging the flanged proximal end 564p of control rod 564. Control rod 564 extends from the handle assembly 512 through the elongated body portion 514 to interact with the disposable loading unit 530 supported at the distal end of the body portion. Accordingly, manipulation of actuation handle 526 causes corresponding longitudinal translation of the actuation shaft 540 and control rod 564 to actuate the disposable loading unit in a manner which will be discussed in detail hereinbelow.
With continuing reference to
As in the previously described embodiment, surgical stapler 500 includes a rack lock (or engagement member) 580 which interacts with the toothed rack 542 of actuation shaft 540 to selectively maintain the longitudinal position thereof within barrel portion 522 against the bias of constant force spring 554. Rack lock 580 is mounted in such a manner so as to move into a position to interact with toothed rack 542 only when a disposable loading unit has been inserted into the distal end of body portion 514. More particularly, rack lock 580, which is mounted on a pivot pin 583 and biased toward the toothed rack 542 by a coiled torsion spring 585, is maintained in a non-interactive position by an abutment strut 582 until a disposable loading unit is loaded into the device. Abutment strut 582 is mounted on a securement flange 586 formed at the proximal end of a support tube 588 which is mounted for axial translation within body portion 514 (see FIG. 21). A coiled biasing spring 592 connects abutment strut 582 to a boss 593 in the housing 520 of handle assembly 512, and, in effect, biases the support tube 588 in a distal direction so that upon insertion of a disposable loading unit, support tube 588 and abutment strut 582 are shifted in a proximal direction.
More specifically, as illustrated in
As illustrated in
Turning now to
As in the previous embodiment, disposable loading unit 530 includes an axial drive assembly 660 which, among other things, transmits the longitudinal drive forces exerted by control rod 564 to the actuation sled 640 disposed within the spaced apart longitudinal slots 642 that extend through staple cartridge 534. A plurality of staple pushers 643 are operatively associated with slots 642 and are sequentially contacted by actuation sled 640 as it is driven through staple cartridge 534 by drive assembly 660. The staple pushers interact with the plurality of staples housed within staple cartridge 534 to sequentially eject the staples therefrom.
Drive assembly 660 includes a bifurcated drive beam 662 having a distal working head 664 and a proximal engagement section 665 that includes a pair of engagement fingers 666a and 666b (see
Referring again to
As best seen in
Lockout assembly 700 further includes a support plate 730 having a pair of depending arms 732a and 732b which interact with the support arms 712a and 712b of blocking plate 710 to maintain the blocking plate in a non-blocking position against the bias of retention spring 718 (see FIG. 26). Support plate 730 is formed with a central slotted region 733 which accommodates the lower portion of drive beam 662. A detent 734 is formed within slotted region 733 for interacting with distal and proximal complementary recesses 735a and 735b formed in the lower portion of drive beam 662.
In use, when drive beam 662 is driven distally, as shown for example in
Upon full withdrawal of flange 667 from drive block 668, blocking plate 710 is free to translate into a full blocking position under the bias of retention spring 718 to block the proximal portal 670 of drive block 668, as illustrated in FIG. 49. The function of lockout assembly 700 and its interaction with control rod 564 and axial drive assembly 660 will be discussed in further detail hereinbelow.
Referring now in sequential order to
As best seen in
If, at such a time, the user of the apparatus desires to unclamp tubular vessel 750 by opening anvil 536, this can be accomplished through the manipulation of a retraction mechanism (described below) associated with handle assembly 512 which serves to disengage rack lock 580 and pawl 544 from actuation shaft 540 to permit the user to draw the actuation shaft in a proximal direction, as illustrated in FIG. 33.
Referring back to
Referring again to
Referring now to
Referring back once again to
Referring once again to
Referring now to
Referring now to
As best seen in
Although the subject invention has been described with respect to preferred embodiments, it will be readily apparent to those having ordinary skill in the art to which it appertains that changes and modifications may be made thereto without departing from the spirit or scope of the subject invention as defined by the appended claims.
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|US20080179375 *||10 Aug 2007||31 Jul 2008||Tyco Healthcare Group Lp||Surgical instrument with replaceable loading unit|
|US20090101693 *||12 Aug 2008||23 Apr 2009||Tyco Healthcare Group Lp||Two Piece Anvil For Surgical Stapler|
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|U.S. Classification||227/176.1, 227/178.1, 227/19|
|International Classification||A61B17/072, A61B17/068|
|Cooperative Classification||A61B17/07207, A61B17/0684, A61B2017/2923, A61B2017/292, A61B2017/2939, A61B2017/07214, A61B2017/00477, A61B2017/2931, A61B2017/07278, A61B2017/07271, A61B17/072, A61B2017/0046, A61B2017/320052|
|European Classification||A61B17/068B2, A61B17/072, A61B17/072B|
|27 Feb 2008||AS||Assignment|
Owner name: UNITED STATES SURGICAL CORPORATION, CONNECTICUT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MASTRI, DOMINICK L.;VIOLA, FRANK J.;ALESI, JR., THOMAS W.;AND OTHERS;REEL/FRAME:020583/0560;SIGNING DATES FROM 19951017 TO 19951020
|14 Jan 2010||AS||Assignment|
Owner name: TYCO HEALTHCARE GROUP LP, CONNECTICUT
Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE APPLICATION SERIAL NUMBER FROM 11331887 TO APPLICATION SERIAL NUMBER 11311887 PREVIOUSLY RECORDED ON REEL 023749 FRAME 0737;ASSIGNOR:UNITED STATES SURGICAL CORPORATION;REEL/FRAME:023782/0958
Effective date: 20091223
|7 Sep 2011||FPAY||Fee payment|
Year of fee payment: 12