Source: http://www.google.es/patents/US9492146
Timestamp: 2017-10-22 17:43:54
Document Index: 266665657

Matched Legal Cases: ['Application No. 61', 'Application No. 2012227315', 'Application No. 12', 'Application No. 12186170', 'Application No. 13172400', 'Application No. 13189026']

Patente US9492146 - Apparatus for endoscopic procedures - Google Patentes
An electromechanical surgical system having an instrument housing for connecting with a shaft assembly, a shaft assembly, and an end effector. The end effector is an articulating end effector and the system includes a cable tensioning system for tensioning the articulation cables. The system includes...http://www.google.es/patents/US9492146?utm_source=gb-gplus-sharePatente US9492146 - Apparatus for endoscopic procedures
Número de publicación US9492146 B2
Número de solicitud US 13/891,288
Fecha de prioridad 25 Oct 2011
También publicado como CA2817302A1, EP2674110A2, EP2674110A3, EP2674110B1, US20130274722, US20170035448
Número de publicación 13891288, 891288, US 9492146 B2, US 9492146B2, US-B2-9492146, US9492146 B2, US9492146B2
Inventores Stanislaw Kostrzewski, Ernest Aranyi, Paul A. Scirica
Citas de patentes (470), Otras citas (58), Clasificaciones (25), Eventos legales (1)
Apparatus for endoscopic procedures
US 9492146 B2
An electromechanical surgical system having an instrument housing for connecting with a shaft assembly, a shaft assembly, and an end effector. The end effector is an articulating end effector and the system includes a cable tensioning system for tensioning the articulation cables. The system includes a clutch mechanism for preventing slippage of a drive cable.
a shaft assembly being arranged for selectively interconnecting the end effector and the instrument housing, the shaft assembly including:
at least one link for allowing articulation of the end effector;
first and second diametrically opposed articulation cables extending at least partially along the at least one link, wherein each articulation cable includes a distal end anchored to the at least one link, and a proximal end;
a first axially displaceable rack coupled to the proximal end of the first articulation cable;
a second axially displaceable rack coupled to the proximal end of the second articulation cable;
a spur gear operatively connecting the first and second racks to one another;
a clevis rotatably supporting the spur gear; and
a cable tensioning assembly including a screw operably coupled to the clevis such that rotation of the screw moves the clevis to adjust a tension in the first and second articulation cables.
2. The electromechanical surgical system according to claim 1, wherein the shaft assembly further includes:
at least one rotatable drive member coupled to the threaded rod, wherein rotation of the at least one drive member of the shaft assembly imparts longitudinal movement to the threaded rod and to move the first rack and articulate the end effector.
3. The electromechanical surgical system according to claim 2, wherein the shaft assembly further includes a distal neck housing supported at a distal end of the at least one link.
4. The electromechanical surgical system according to claim 2, wherein rotation of the threaded rod translates the first rack to axially displace the first articulation cable to articulate the end effector.
5. The electromechanical surgical system according to claim 1, wherein the clevis is axially slidable relative to the screw of the cable tensioning assembly.
6. The electromechanical surgical system according to claim 5, wherein axial displacement of the clevis results in axial displacement of the spur gear and, in turn, the first rack and the second rack.
7. The electromechanical surgical system according to claim 1, wherein the clevis is biased in a proximal direction.
8. The electromechanical surgical system according to claim 1, wherein the clevis is connected to the screw to axially displace the clevis upon a rotation of the screw.
9. The electromechanical surgical system according to claim 1, further comprising a clutch mechanism attached to at least one rotatable drive member of the shaft assembly, the clutch mechanism having a plunger member with camming surfaces and a coupling member with camming surfaces.
10. The electromechanical surgical system according to claim 9, wherein the clutch mechanism includes a biasing member engaged with the plunger member to press the plunger member against the coupling member so that the camming surfaces of the plunger member are in engagement with the camming surfaces of the coupling member.
11. The electromechanical surgical system according to claim 9, wherein the clutch mechanism includes a coupler defining an angled inner-annular surface for mating with an angled outer annular profile of the plunger member.
a shaft assembly arranged for selectively interconnecting the end effector and the instrument housing, the shaft assembly including:
at least one rotatable drive member;
first and second diametrically opposed articulation cables extending at least partially along the at least one link, wherein each articulation cable includes a distal end anchored to the at least one link, and a proximal end being secured to a respective first and second axially displaceable rack, each rack being operatively connected to one another by a spur gear, the spur gear being attached to a clevis; and
a threaded rod extending proximally from the first rack, wherein rotation of the at least one drive member of the shaft assembly imparts longitudinal movement to the threaded rod to move the first rack and articulate the end effector.
13. An electromechanical surgical system, comprising:
at least one link for allowing articulation of the end effector; and
first and second diametrically opposed articulation cables extending at least partially along the at least one link, wherein each articulation cable includes a distal end anchored to the at least one link, and a proximal end being secured to a respective first and second axially displaceable rack, each rack being operatively connected to one another by a spur gear, the spur gear being attached to a clevis that is biased in a proximal direction.
This application is a continuation-in-part of U.S. patent application Ser. No. 13/444,228, filed on Apr. 11, 2012, which is a continuation-in-part of U.S. patent application Ser. No. 13/280,898, filed on Oct. 25, 2011, which is a continuation-in-part of application Ser. No. 13/280,859, filed on Oct. 25, 2011, and also claims the benefit of U.S. Provisional Patent Application No. 61/779,873, filed on Mar. 13, 2013, and U.S. Provisional Patent Application 61/672,891, filed on Jul. 18, 2012, and U.S. Provisional Patent Application 61/659,116, filed Jun. 13, 2012, and the entire content of which is incorporated herein by reference.
The clutch mechanism may have a plunger member with camming surfaces and a coupling member with camming surfaces. The clutch mechanism, in certain embodiments, includes a biasing member engaged with the plunger member to press the plunger member against the coupling member so that the camming surfaces of the plunger member are in engagement with the camming surfaces of the coupling member.
FIG. 33 is a perspective view, with parts separated, of the drive beam, the knife sled and the actuation sled of the end effector of FIGS. 27-29;
Embodiments of the presently disclosed electromechanical surgical system, apparatus and/or device are described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views. As used herein the term “distal” refers to that portion of the electromechanical surgical system, apparatus and/or device, or component thereof, that are farther from the user, while the term “proximal” refers to that portion of the electromechanical surgical system, apparatus and/or device, or component thereof, that are closer to the user.
Reference may be made to International Application No. PCT/US2008/077249, filed Sep. 22, 2008 (Inter. Pub. No. WO 2009/039506) and U.S. patent application Ser. No. 12/622,827, filed on Nov. 20, 2009, the entire content of each of which are hereby incorporated herein by reference, for a detailed description of the construction and operation of exemplary electromechanical, hand-held, powered surgical instrument 100
Upper housing portion 108 of instrument housing 102 defines a nose or connecting portion 108 a configured to accept a corresponding shaft coupling assembly 214 of transmission housing 212 of shaft assembly 200. As seen in FIG. 3, connecting portion 108 a of upper housing portion 108 of surgical instrument 100 has a cylindrical recess 108 b that receives shaft coupling assembly 214 of transmission housing 212 of shaft assembly 200 when shaft assembly 200 is mated to surgical instrument 100. The connecting portion 108 a of the surgical instrument 100 has at least one rotatable drive member. In particular, connecting portion 108 a houses three rotatable drive members or connectors 118, 120, 122, each independently actuatable and rotatable by the drive mechanism (not shown) housed within instrument housing 102.
Upper housing portion 108 of instrument housing 102 provides a housing in which the drive mechanism (not shown) is situated. The drive mechanism is configured to drive shafts and/or gear components in order to perform the various operations of surgical instrument 100. In particular, the drive mechanism is configured to drive shafts and/or gear components in order to selectively move end effector 400 relative to shaft assembly 200; to rotate anvil assembly 200 and/or end effector 400, about a longitudinal axis “X” (see FIGS. 1 and 2), relative to instrument housing 102; to move an upper jaw or anvil assembly 442 of end effector 400 relative to a lower jaw or cartridge assembly 432 of end effector 400; to articulate and/or rotate the shaft assembly; and/or to fire a stapling and cutting cartridge within cartridge assembly 432 of end effector 400.
The selective rotation of drive member(s) or connector(s) 118, 120 and/or 122 of surgical instrument 100 allows surgical instrument 100 to selectively actuate different functions of end effector 400. As will be discussed in greater detail below, selective and independent rotation of first drive member or connector 118 of surgical instrument 100 corresponds to the selective and independent opening and closing of end effector 400, and driving of a stapling/cutting component of end effector 400. Also, the selective and independent rotation of second drive member or connector 120 of surgical instrument 100 corresponds to the selective and independent articulation of end effector 400 transverse to longitudinal axis “X” (see FIG. 1). Additionally, the selective and independent rotation of third drive member or connector 122 of surgical instrument 100 corresponds to the selective and independent rotation of end effector 400 about longitudinal axis “X” (see FIG. 1) relative to instrument housing 102 of surgical instrument 100.
As seen in FIGS. 1, 2 and 4, shaft assembly 200 includes an elongate, substantially rigid, outer tubular body 210 having a proximal end 210 a and a distal end 210 b; a transmission housing 212 connected to proximal end 210 a of tubular body 210 and being configured for selective connection to surgical instrument 100; and an articulating neck assembly 230 connected to distal end 210 b of elongate body portion 210.
Transmission housing 212 of shaft assembly 200 is configured and adapted to connect to connecting portion 108 a of upper housing portion 108 of surgical instrument 100. As seen in FIGS. 3-5, transmission housing 212 of shaft assembly 200 includes a shaft coupling assembly 214 supported at a proximal end thereof.
As seen in FIGS. 5 and 20-25, transmission housing 212 and shaft coupling assembly 214 rotatably support a first proximal or input drive shaft 224 a, a second proximal or input drive shaft 226 a, and a third drive shaft 228.
Shaft coupling assembly 214 is configured to rotatably support first, second and third connector sleeves 218, 220 and 222, respectively. Each of connector sleeves 218, 220, 222 is configured to mate with respective first, second and third drive members or connectors 118, 120, 122 of surgical instrument 100, as described above. Each of connector sleeves 218, 220, 222 is further configured to mate with a proximal end of respective first input drive shaft 224 a, second input drive shaft 226 a, and third drive shaft 228.
Shaft drive coupling assembly 214 includes a first, a second and a third biasing member 218 a, 220 a and 222 a disposed distally of respective first, second and third connector sleeves 218, 220, 222. Each of biasing members 218 a, 220 a and 222 a is disposed about respective first proximal drive shaft 224 a, second proximal drive shaft 226 a, and third drive shaft 228. Biasing members 218 a, 220 a and 222 a act on respective connector sleeves 218, 220 and 222 to help maintain connector sleeves 218, 220 and 222 engaged with the distal end of respective drive rotatable drive members or connectors 118, 120, 122 of surgical instrument 100 when shaft assembly 200 is connected to surgical instrument 100.
In particular, first, second and third biasing members 218 a, 220 a and 222 a function to bias respective connector sleeves 218, 220 and 222 in a proximal direction. In this manner, during connection of shaft assembly 200 to surgical instrument 100, if first, second and or third connector sleeves 218, 220 and/or 222 is/are misaligned with the drive members or connectors 118, 120, 122 of surgical instrument 100, first, second and/or third biasing member(s) 218 a, 220 a and/or 222 a are compressed. Thus, when the drive mechanism of surgical instrument 100 is engaged, drive members or connectors 118, 120, 122 of surgical instrument 100 will rotate and first, second and/or third biasing member(s) 218 a, 220 a and/or 222 a will cause respective first, second and/or third connector sleeve(s) 218, 220 and/or 222 to slide back proximally, effectively coupling drive members or connectors 118, 120, 122 of surgical instrument 100 to respective first input drive shaft 224 a, second input drive shaft 226 a, and third drive shaft 228.
As seen in FIGS. 5 and 6, first gear train system 240 includes first input drive shaft 224 a, and a first input drive shaft spur gear 242 a keyed to first input drive shaft 224 a. First gear train system 240 also includes a first transmission shaft 244 rotatably supported in transmission housing 212, a first input transmission spur gear 244 a keyed to first transmission shaft 244 and engaged with first input drive shaft spur gear 242 a, and a first output transmission spur gear 244 b keyed to first transmission shaft 244. First gear train system 240 further includes a first output drive shaft 246 a rotatably supported in transmission housing 212 and tubular body 110, and a first output drive shaft spur gear 246 b keyed to first output drive shaft 246 a and engaged with first output transmission spur gear 244 b.
In accordance with the present disclosure, first input drive shaft spur gear 242 a includes 10 teeth; first input transmission spur gear 244 a includes 18 teeth; first output transmission spur gear 244 b includes 13 teeth; and first output drive shaft spur gear 246 b includes 15 teeth. As so configured, an input rotation of first input drive shaft 224 a is converted to an output rotation of first output drive shaft 246 a by a ratio of 1:2.08.
As mentioned above, a proximal end of first input drive shaft 224 a is configured to support first connector sleeve 218.
In operation, as first input drive shaft spur gear 242 a is rotated, due to a rotation of first connector sleeve 258 and first input drive shaft 224 a, as a result of the rotation of the first respective drive connector 118 of surgical instrument 100, first input drive shaft spur gear 242 a engages first input transmission spur gear 244 a causing first input transmission spur gear 244 a to rotate. As first input transmission spur gear 244 a rotates, first transmission shaft 244 is rotated and thus causes first output drive shaft spur gear 246 b, that is keyed to first transmission shaft 244, to rotate. As first output drive shaft spur gear 246 b rotates, since first output drive shaft spur gear 246 b is engaged therewith, first output drive shaft spur gear 246 b is also rotated. As first output drive shaft spur gear 246 b rotates, since first output drive shaft spur gear 246 b is keyed to first output drive shaft 246 a, first output drive shaft 246 a is rotated.
As seen in FIGS. 5 and 7, second gear train system 250 includes second input drive shaft 226 a, and a second input drive shaft spur gear 252 a keyed to second input drive shaft 226 a. Second gear train system 250 also includes a first transmission shaft 254 rotatably supported in transmission housing 212, a first input transmission spur gear 254 a keyed to first transmission shaft 254 and engaged with second input drive shaft spur gear 252 a, and a first output transmission spur gear 254 b keyed to first transmission shaft 254.
Second gear train system 250 further includes a second transmission shaft 256 rotatably supported in transmission housing 212, a second input transmission spur gear 256 a keyed to second transmission shaft 256 and engaged with first output transmission spur gear 254 b that is keyed to first transmission shaft 254, and a second output transmission spur gear 256 b keyed to second transmission shaft 256.
Second gear train system 250 additionally includes a second output drive shaft 258 a rotatably supported in transmission housing 212 and tubular body 210, and a second output drive shaft spur gear 258 b keyed to second output drive shaft 258 a and engaged with second output transmission spur gear 256 b.
In accordance with the present disclosure, second input drive shaft spur gear 252 a includes 10 teeth; first input transmission spur gear 254 a includes 20 teeth; first output transmission spur gear 254 b includes 10 teeth; second input transmission spur gear 256 a includes 20 teeth; second output transmission spur gear 256 b includes 10 teeth; and second output drive shaft spur gear 258 b includes 15 teeth. As so configured, an input rotation of second input drive shaft 226 a is converted to an output rotation of second output drive shaft 258 a by a ratio of 1:6.
As mentioned above, a proximal end of second input drive shaft 226 a is configured to support second connector sleeve 220.
In operation, as second input drive shaft spur gear 252 a is rotated, due to a rotation of second connector sleeve 260 and second input drive shaft 226 a, as a result of the rotation of the second respective drive connector 120 of surgical instrument 100, second input drive shaft spur gear 252 a engages first input transmission spur gear 254 a causing first input transmission spur gear 254 a to rotate. As first input transmission spur gear 254 a rotates, first transmission shaft 254 is rotated and thus causes first output transmission spur gear 254 b, that is keyed to first transmission shaft 254, to rotate. As first output transmission spur gear 254 b rotates, since second input transmission spur gear 256 a is engaged therewith, second input transmission spur gear 256 a is also rotated. As second input transmission spur gear 256 a rotates, second transmission shaft 256 is rotated and thus causes second output transmission spur gear 256 b, that is keyed to second transmission shaft 256, to rotate. As second output transmission spur gear 256 b rotates, since second output drive shaft spur gear 258 b is engaged therewith, second output drive shaft spur gear 258 b is rotated. As second output drive shaft spur gear 258 b rotates, since second output drive shaft spur gear 258 b is keyed to second output drive shaft 258 a, second output drive shaft 258 a is rotated.
As mentioned above and as seen in FIGS. 5 and 8, transmission housing 212 and shaft coupling assembly 214 rotatably support a third drive shaft 228. Third drive shaft 228 includes a proximal end 228 a configured to support third connector sleeve 222, and a distal end 228 b extending to and operatively connected to an articulation assembly 270 as will be discussed in greater detail below.
As seen in FIG. 4, elongate, outer tubular body 210 of shaft assembly 200 includes a first half section 211 a and a second half section 211 b defining at least three longitudinally extending channels through outer tubular body 210 when half sections 211 a, 211 b are mated with one another. The channels are configured and dimensioned to rotatably receive and support first output drive shaft 246 a, second output drive shaft 258 a, and third drive shaft 228 as first output drive shaft 246 a, second output drive shaft 258 a, and third drive shaft 228 extend from transmission housing 212 to articulating neck assembly 230. Each of first output drive shaft 246 a, second output drive shaft 258 a, and third drive shaft 228 are elongate and sufficiently rigid to transmit rotational forces from transmission housing 220 to articulating neck assembly 230.
Each link 234 includes cooperating knuckles and devices formed on each of a proximal surface 234 a and a distal surface 234 b thereof. Proximal neck housing 232 includes knuckles and/or clevises that operatively engage with the knuckles and/or clevises of a proximal-most link. Distal neck housing 236 includes knuckles and/or devises that operatively engage with the knuckles and/or clevises of a distal-most link. The knuckles and clevises of adjacent neck housings 232, 236 and links 234 operatively engage with one another to define a direction and a degree of articulation of neck assembly 230.
Each link 234 defines a first lumen 234 c (see FIG. 12) therein for passage of a first drive cable or member 266 therethrough; a first pair of opposed lumens 234 d 1, 234 d 2, for passage of a pair of articulation cables 262, 264 therethrough; and a second lumen 234 e for passage of a second drive cable or member 268 therethrough. As seen in FIG. 12, first and second lumens 234 c, 234 e are diametrically opposed to one another and offset 90° relative to lumens 234 d 1, 234 d 2. Each of first drive cable or member 266 and second drive cable or member 268 includes a proximal end keyed to a distal end of respective first output drive shaft 246 a and second output drive shaft 258 a. Each of first and second drive cables 266, 268 is fabricated from a material that is both flexible and torsionally stiff (capable of transmitting rotational forces or torque), such as, for example, stainless steel and the like.
As seen in FIGS. 12, 13 and 17, rack 274 is attached to a threaded shaft 272 a extending proximally therefrom and that is in threaded engagement with a distal end of an internally threaded nut 278. Threaded nut 278 is rotatably supported and axially fixed within a pocket 232 a formed in proximal neck housing 232. A proximal end of threaded nut 278 is keyed to a distal end of third drive shaft 228. While threaded shaft 272 a is shown extending from rack 274, it is understood, and within the scope of the present disclosure, that the threaded shaft may extend from rack 272 without departing from the principles of the present disclosure.
Articulation cables 262, 264 include proximal ends that are secured to and extend from a respective distal end of racks 272, 274. Each articulation cable 262, 264 includes a distal end that extends through respective opposed lumens 234 d 1, 234 d 2 of links 234 and that is secured to or anchored in distal neck housing 234 or the distal most link.
In operation, to articulate neck assembly 230 in a first direction, third drive shaft 228 is rotated in a first direction, as described above, to rotate threaded nut 278 and axially displace threaded shaft 272 a distally to axially displace rack 274 distally (see FIG. 16). As rack 274 is displaced axially, in a distal direction, rack 274 causes pinion gear 276 to be rotated and to thus act on rack 272, to axially displace rack 272 in a proximal direction. As rack 272 is axially displaced in a proximal direction, rack 272 causes articulation cable 262 to be drawn in a proximal direction and thereby articulate neck assembly 230, as illustrated in FIG. 16. Neck assembly 230 is permitted to articulate since axially displacement of rack 274, in a distal direction, results in axial, distal displacement of articulation cable 264.
As seen in FIGS. 20-25, first gear train 280 of distal neck housing 236 includes a first spur gear 282 a rotatably supported in distal neck housing 236 and keyed to a distal end of first drive cable 266 of shaft assembly 200. First gear train 280 of distal neck housing 236 further includes a second spur gear 282 b rotatably supported in distal neck housing 236 and engaged with first spur gear 282 a. First gear train 280 of distal neck housing 236 also includes a third spur gear 282 c rotatably supported in distal neck housing 236 and engaged with second spur gear 282 b.
Third spur gear 282 c includes a bore 282 d formed along a central axis thereof that is configured for mating receipt of a drive axle 426 of end effector 400 (see FIG. 26).
In accordance with the present disclosure, first spur gear 282 a includes 8 teeth; second spur gear 282 b includes 10 teeth; and third spur gear 282 c includes 8 teeth. As so configured, an input rotation of first drive cable 266 is converted to an output rotation of third spur gear 282 c of distal neck housing 236 by a ratio of 1:1. Additionally, first gear train 280 is provided to rotatably and mechanically connect first drive cable 266 to drive axle 426 of end effector 400.
In operation, as first drive cable 266 is rotated, due to a rotation of first output drive shaft 246 a (as described above), said rotation is transmitted to first spur gear 282 a of first gear train 280. As first spur gear 282 a is rotated, third spur gear 282 c is rotated due to the inter-engagement of first spur gear 282 a and third spur gear 282 c by second spur gear 282 b. As third spur gear 282 c is rotated, when end effector 400 is connected to shaft assembly 200, and specifically, third spur gear 282 c is connected to drive axle 426 of end effector 400, a rotation of third spur gear 282 c results in rotation of drive axle 426 of end effector 400 and actuation of end effector 400.
As seen in FIGS. 20-25, second gear train 290 of distal neck housing 236 includes a first spur gear 292 a rotatably supported in distal neck housing 236 and keyed to a distal end of second drive cable 268 of shaft assembly 200. Second gear train 290 of distal neck housing 236 further includes a second spur gear 292 b rotatably supported in distal neck housing 236 and engaged with first spur gear 292 a. Second gear train 290 of distal neck housing 236 also includes a non-circular shaft 292 c extending from second spur gear 292 b (see FIG. 21). Non-circular shaft 292 c is keyed to a rotation hub 294 such that rotation of non-circular shaft 292 c results in rotation of rotation hub 294.
Rotation hub 294 is provided between a shaft of third spur gear 282 c, of first gear train 280, that defines the bore 282 d thereof and rotation hub 294 transmitting relative rotation of third spur gear 282 c of first gear train 280 to rotation hub 294 of second gear train 290.
In accordance with the present disclosure, first spur gear 292 a includes 8 teeth (which functions as the input); and second spur gear 292 b includes 10 teeth. As so configured, an input rotation of second drive cable 268 is converted to an output rotation of rotation hub 294. The gear ratio for this is 1:0.8. Additionally, second gear train 290 is provided to rotatably and mechanically connect second drive cable 268 to rotation hub 294 of distal neck housing 236 of neck assembly 230.
In operation, as second drive cable 268 of shaft assembly 200 is rotated, due to a rotation of second output drive shaft 258 a (as described above), said rotation is transmitted to first spur gear 292 a of first gear train 290. As first spur gear 292 a is rotated, non-circular shaft 292 c is rotated due to its connection with second spur gear 292 b. As non-circular shaft 292 c is rotated, when end effector 400 is connected to shaft assembly 200, and specifically, rotation hub 294 is connected to alignment stems 424 a, 424 b of end effector 400, a rotation of rotation hub 294 results in rotation of end effector 400.
It is contemplated that collar 312 includes at least one nub 312 a extending radially inward from inner surface thereof for receipt in a respective complementary structure 422 a formed in an outer surface of end effector 400 to connect end effector 400 to shaft assembly 200 in the manner of a bayonet-type connection. Other forms of connection are contemplated, such as, detents, threaded connections, etc.
As seen in FIGS. 26-28, mounting portion 420 includes a coupling member 422 secured to a proximal end thereof. Coupling member 422 defines a substantially J-shaped channel 422 a (see FIGS. 26-28) formed in a radial outer surface thereof that is configured and dimensioned for selective connection with complementary structure formed on or extending radially inward from collar 312 of end effector coupling assembly 310, as described above. Coupling member 422 further includes a pair of spaced apart alignment stems 424 a, 424 b projecting proximally therefrom, for receipt in respective alignment bores 310 a, 310 b formed in a distal surface of end effector coupling assembly 310.
The alignment stems 424 a, 424 b along with the alignment bores 310 a, 310 b are used to align and couple end effector 400 to end effector coupling assembly 310 of shaft assembly 200. The nub 312 a of collar 312 and the J-shaped channel 422 a of coupling member 422 may define a conventional bayonet-type coupling which facilitates quick and easy engagement and removal of end effector 400 from shaft assembly 200 before, during or after a surgical procedure.
Mounting portion 420 further includes, as seen in FIGS. 26, 28-31, 34 and 35 a drive axle 426 rotatably supported therein. Drive axle 426 includes a multi-faceted, proximal head 426 a projecting proximally from coupling member 422 and being configured for mating engagement with third spur gear 282 c of first gear train 280 of distal neck housing 236 and first gear train system 240 of shaft assembly 200, when end effector 400 is coupled to shaft assembly 200. Drive axle 426 further includes multi-faceted, a distal head 426 b projecting distally from coupling member 422 and being configured for mating engagement with a threaded drive shaft 464 supported in lower jaw 432 of jaw assembly 430. Drive axle 426 functions to transmit rotational drive forces from third spur gear 282 c of first gear train 280 of distal neck housing 236 and of first gear train system 240 of shaft assembly 200, which defines an axis of rotation, to drive screw 464 of lower jaw 432 of jaw assembly 430, which defines an axis of rotation that is different than the axis of rotation of third spur gear 282 c.
As seen in FIGS. 28-31, 34-36 and 39-43, lower jaw 432 of jaw assembly 430 includes a drive screw 464 rotatably supported therein and extending substantially an entire length thereof. Drive screw 464 includes a female coupling member 464 a supported on a proximal end thereof and being configured for receipt of multi-faceted, distal head 426 b of drive axle 426. Drive screw 464 is axially and laterally fixed within lower jaw 432 of jaw assembly 430 by a thrust plate 465, or the like, which is secured to jaw assembly 430 and at least partially extends into an annular channel 464 a formed in drive screw 464. In operation, rotation of drive axle 426 results in concomitant rotation of drive screw 464.
As seen in FIGS. 28-43, end effector 400 includes a drive beam 466 slidably supported in lower jaw 432 of jaw assembly 430. Drive beam 466 includes a substantially I-shaped cross-sectional profile and is configured to approximate lower jaw 432 and upper jaw 442, and to axially displace an actuation sled 468 through lower jaw 432. As seen in FIG. 33, drive beam 466 includes a vertically oriented support strut 466 a; a lateral projecting member 466 b formed atop support strut 466 a and being configured to engage and translate with respect to an exterior camming surface of upper jaw 442 to progressively close jaw assembly 430; and a retention foot 466 c having an internally threaded bore for threadable connection to threaded drive shaft 464. Since drive beam 466 is prevented from rotation by the engagement of strut 466 a and/or cam member 466 b with upper jaw 442, as drive screw 464 is rotated, retention foot 466 c, and in turn, drive beam 466 is axially translated relative to lower jaw 432.
Drive beam 466 includes a lock clip 467 extending distally from strut 466 a. Lock clip 467 defines a hook 467 a configured to engage a window 450 c formed in a knife sled 450, as will be discussed in greater detail below. Hook 467 a of lock clip 467 is biased to extend away from knife sled 450. Prior to firing the cartridge assembly 410, the drive beam 466 is at a proximal-most position in lower jaw 432 and actuation sled 418 and knife sled 450 are at a proximal-most position in cartridge body 412, as seen in FIGS. 36 and 37. Lock clip 467, prior to firing, is disengaged from window 450 c of knife sled 450 and extends into a relief 412 e defined in a wall of knife slot 412 b.
Lower jaw 432 is in the form of a channel and is configured and adapted to selectively receive a disposable staple cartridge assembly 410 therein. Staple cartridge assembly 410 includes a cartridge body 412 defining a plurality of rows of staple retaining slots 412 a and a longitudinally extending knife slot 412 b disposed between pairs of rows of staple retaining slots 412 a. Staple cartridge assembly 410 also includes a plurality of staples 433 disposed, one each, in the plurality of retaining slots 412 a. Staple cartridge assembly 410 further includes a plurality of staple pushers 416 supported therein, wherein the staple pushers 416 are aligned one each within retaining slots 412 a such that a single staple pusher 416 is positioned under a respective staple 433 which is retained within slot 412 a. Staple pushers 416 may be formed such that they are attached to each other in a pusher member having groups of two or three pushers, wherein the pusher member may have offset oriented pushers. One or more actuating surfaces is provided on a lower surface of the pusher member (not shown).
Staple cartridge assembly 410 includes an actuation sled 418 slidably supported against a lower surface of cartridge body 412 and being engageable by drive beam 466. Actuation sled 418 includes upstanding cam wedges 418 a configured to exert a driving force on staple pushers 416, by contacting the actuating surfaces, which drives staples 414 from staple cartridge assembly 410, as described in greater detail below.
Cartridge body 412 defines a plurality of spaced apart longitudinal channels 412 c (see FIG. 36) extending therethrough to accommodate the upstanding cam wedges 418 a of actuation sled 418. Channels 412 c communicate with the plurality of retaining slots 412 a within which the plurality of staples 433 and pushers 416 are respectively supported.
As seen in FIGS. 28-43, staple cartridge assembly 410 further includes a knife sled 450 slidably supported within knife slot 412 b of cartridge body 412 and being interposed between drive beam 466 and actuation sled 468. As seen in FIG. 33, knife sled 450 defines a knife blade 450 a extending from an upper surface thereof and oriented distally, wherein knife blade 450 a extends through knife slot 412 b of cartridge body 412. Knife sled 450 includes a lock-out spring 451 extending distally therefrom for engaging a lock-out notch 412 d formed in a surface of cartridge body 412 (see FIG. 37), as will be discussed in greater detail below. Lock-out spring 451 is biased toward lock-out notch 412 d. Prior to firing of cartridge assembly 410, with actuation sled 418 and knife sled 450 at a proximal-most position in cartridge body 412, as seen in FIG. 34-37, lock-out spring 451 is blocked by actuation sled 418 from entering lock-out notch 412 d of cartridge body 412.
Staple cartridge assembly 410 includes a bottom cover or retainer 415 configured to maintain the plurality of staple pushers 416, actuation sled 418 and knife sled 450 within cartridge body 412. Retainer 415 supports and aligns the plurality of pushers 416 prior to engagement thereof by the actuation sled 418. During operation, as actuation sled 418 translates through staple cartridge assembly 410, the angled leading edges of cam wedges 418 a of actuation sled 418 sequentially contact pushers 416, causing the pushers 416 to translate vertically within retaining slots 412 a, urging the staples 433 therefrom. Also, as knife sled 450 translates through knife slot 412 b of cartridge body 412, knife blade 450 a severs tissue and retaining sutures that extend across knife slot 412 b of cartridge body 412.
In operation, as drive screw 464 is rotated, in a first direction, to advance drive beam 466, as described above, drive beam 466 is advanced into contact with knife sled 450 and actuation sled 418 to distally advance or push knife sled 450 and actuation sled 418 through cartridge body 412 and lower jaw 432. As drive beam 466 is continually driven in the distal direction, drive beam 466 maintains contact with knife sled 450 and actuation sled 418, thereby pushing knife sled 450 and actuation sled 418 in the distal direction and to approximate lower jaw 430 and upper jaw 440, as laterally projecting member 466 b of drive beam 466 pushes down on the exterior camming surface of upper jaw 440, to eject the staples 414 and fasten tissue, and to simultaneously dissect tissue with knife blade 450 a. Knife sled 450, actuation sled 418 and drive beam 466 travel through cartridge body 412 thereby fastening and severing tissue.
As seen in FIGS. 37 and 38, as drive beam 466 is advanced distally, hook 467 a of lock clip 467 exits relief 412 e and is cammed into window 450 c of knife sled 450 as hook 467 a enters knife slot 412 b of cartridge body 412. Drive screw 464 is rotated until actuation sled 418, knife sled 450 and drive beam 466 reach a distal-most end of cartridge body 412 and/or lower jaw 432, for a complete firing.
Following a complete or partial firing, drive screw 464 is rotated in an opposite direction to retract drive beam 466. Since and knife sled 450 is connected to drive beam 466 by lock clip 467, as described above, as drive beam 466 is retracted, knife sled 450 is also retracted. Actuation sled 418 will tend to remain at a distal or distal-most position due to its frictional engagement in channels 412 c of cartridge body 412 (see FIG. 40). Drive screw 464 is rotated until drive beam 466 and knife sled 450 are returned to the proximal-most position. Once drive beam 466 and knife sled 450 are returned to the proximal-most position, hook 467 a of lock clip 467 is permitted to re-enter relief 412 e, due to its own resiliency, and disengage from window 450 c of knife sled 450. As such, drive beam 466 is disengaged from knife sled 450, and staple cartridge assembly 410 is free to be removed from lower jaw 432.
Also, when drive beam 466 and knife sled 450 are returned to the proximal-most position, with actuation sled 418 now separated from knife sled 450, since lock-out spring 451 is biased toward lock-out notch 412 d, as seen in FIG. 43, lock-out spring 451, which is attached to knife sled 450, is now free to enter lock-out notch 412 d and prevent knife sled 450 and/or drive beam 466 being re-advanced, thereby locking-out staple cartridge assembly 410.
Upper jaw 442 of jaw assembly 430 functions as an anvil against which the staples 433 form when actuation sled 418 is advanced during a firing of surgical instrument 100. In particular, upper jaw 442 includes an anvil plate 443, secured to a cover housing 444, in juxtaposed relation to staple cartridge assembly 410. Anvil plate 443 defines a plurality of staple forming pockets (not shown), arranged in longitudinally extending rows that cooperate with the rows of staple retaining slots 412 a of staple cartridge assembly 410, when staple cartridge assembly 410 is disposed in lower jaw 432.
Lower jaw 432 is pivotably connected to mounting portion 420 by way of appropriate pivot pins 445 or the like extending through a pair of spaced apart shoulders 432 a, 432 b disposed near a proximal end thereof. Shoulders 432 a, 432 b of lower jaw 432 extend into reliefs or the like formed in mounting portion 420.
As seen in FIG. 28, jaw assembly 430 includes at least one biasing member 447, in the form of a compression spring or the like, disposed between each shoulder 432 a, 432 b of lower jaw 432 and a bearing surface of mounting portion 420 such that lower jaw 432 is spaced from upper jaw 442, until closed, to maintain jaw assembly 430 in an open position. In use, as jaw assembly 430 is closed, by approximating upper jaw 442 and lower jaw 432, biasing members 447 are biased (i.e., compressed) between shoulders 432 a, 432 b of lower jaw 432 and the bearing surface of mounting portion 420.
Following firing of staple cartridge assembly 410, drive screw 464 is rotated, in a second direction that is opposite the first direction, to withdraw drive beam 466 and knife sled 450, as described above. As drive beam 466 is withdrawn in a proximal direction, biasing members 447 begin to expand to press apart shoulders 432 a, 432 b of lower jaw 432 from the bearing surface of mounting portion 420 to separate the upper jaw 442 from the lower jaw 432 to open jaw assembly 430.
In accordance with the present disclosure, cartridge body 412 of staple cartridge assembly 410 may be configured and adapted to selectively support a surgical buttress on a tissue contact surface thereof. With reference to FIG. 28, cartridge body 412 of staple cartridge assembly 410 defines a proximal pair of recesses formed near a proximal end thereof and disposed, one each, on opposed sides of longitudinally extending knife slot 412 b. Cartridge body 412 further defines a distal pair of recesses 412 e formed near a distal end thereof and disposed, one each, on opposed sides of longitudinally extending knife slot 412 b. In one embodiment, the distal pair of recesses 412 e is preferably non-circular and constricting or otherwise arranged so as to frictionally engage and/or pinch an anchor “S”.
As seen in FIG. 28, cartridge body 412 further includes a surgical cartridge buttress “B1”, pledget or the like operatively secured to an upper surface or tissue contacting surface thereof, by suture anchors “S1” and “S2”, to overlie at least some of the plurality of staple retaining slots 412 a and/or at least a portion of a length of longitudinally extending knife slot 412 b. In particular, an anchor “S1” is cinched around a proximal portion of surgical cartridge buttress “B1” and each of the proximal pair of recesses and an anchor “S2” is cinched around a distal portion of the surgical cartridge buttress “B1” and each of the distal pair of recesses 412 e. The anchors may comprise a surgical suture.
In one particular embodiment, a first end of suture anchor “S1” includes a knot, stop or the like (not shown) sized so as to not pass through one recess of the proximal pair of recesses and a second end of suture anchor “S1” passes over, and transversely across, surgical cartridge buttress “B1”, at least once, and back through the other recess of the proximal pair of recesses. For example, the second end of suture anchor “S1” may be pinched or cinched in the other recess of the proximal pair of recesses so as to anchor the second end of the suture anchor “S1” and secure the surgical cartridge buttress “B1” against the tissue contacting surface of cartridge body 412. Similarly, a suture anchor “S2” is used to extend transversely across surgical cartridge buttress “B1” and into engagement with the distal pair of recesses 412 e.
Surgical cartridge buttress “B1” includes a proximal pair of notches formed in side edges aligned with the proximal pair of recesses of cartridge body 412, a distal pair of notches formed in side edges thereof aligned with the distal pair of recesses 412 e of cartridge body 412, and a proximal notch formed in a proximal edge thereof aligned with longitudinally extending knife slot 412 b when cartridge buttress “B1” is secured to cartridge body 412. Cartridge buttress “B1” further includes a tongue or tab extending from a distal edge thereof to facilitate with the attachment of cartridge buttress “B1” to cartridge body 412 during the assembly process. It is contemplated that a width of cartridge buttress “B1” may be reduced in a proximal portion thereof. It is further contemplated that the tongue is removed from cartridge buttress “B1” following securement of cartridge buttress “B1” to cartridge body 412 and prior to packaging or shipment.
As seen in FIGS. 28 and 44-47, cartridge body 412 of staple cartridge assembly 410 includes a cartridge buttress release assembly 470 supported in and near a distal end of cartridge body 412. Release assembly 470 includes a retainer 472 supported in a distal end of cartridge body 412 at a location near a distal end of longitudinally extending knife slot 412 b and at least partially extending thereacross. Retainer 472 includes a body portion 472 a, a boss 472 b extending from a surface thereof, and defines a channel or recess 427 c formed in a surface thereof and extending through a side thereof. When supported in cartridge body 412, recess 472 c of retainer 472 is in registration with one of the pair of distal recesses 412 e of cartridge body 412.
Release assembly 470 further includes a pusher member 474 having a head portion 474 a pivotally connected to boss 472 b of retainer 472. Pusher member 474 further includes a first leg member 474 b extending from head portion 474 a and a second leg member 474 c connected to a free end of first leg member 474 b via a living hinge connection. Pusher member 474 further includes piston 474 e connected to a free end of second leg member 474 c via a living hinge connection. Piston 474 e is slidably disposed and translatable within recess 472 c of retainer 472. In certain other embodiments, the pusher is a linkage assembly having a first link pivotably connected to the cartridge body at one end. The other end of the first link is pivotably connected to a first end of a second link. The opposite, second, end of the second link is confined in the recess of the retainer.
As seen in FIG. 46, release assembly 470 includes an unactuated configuration wherein piston 474 e does not extend into or overlie the respective one of the pair of distal recesses 412 e of cartridge body 412, and first leg member 474 b and second leg member 474 c are angled with respect to one another and project proximally along longitudinally extending knife slot 412 b of cartridge body 412. It is contemplated that release assembly 470 may include a friction fit or snap fit feature for maintaining and/or retaining release assembly 470 in the locking or anchoring configuration at all times following the manufacturing/assembly process and prior to a complete firing of surgical instrument 100.
As seen in FIG. 47, release assembly 470 includes an actuated configuration wherein piston 474 e extends into or overlies the respective one of the pair of distal recesses 412 d of cartridge body 412 in operative registration therewith, and first leg member 474 b and second leg member 474 c are extended substantially along a common axis.
In operation, with surgical cartridge buttress “B1” secured against the tissue contacting surface of cartridge body 412, during firing of surgical instrument 100, as drive beam 466 is advanced (i.e., moved from a proximal-most position to a distal-most position), knife blade 450 a of knife sled 450 slices through a central section of proximal suture anchor “S1”, thereby freeing the proximal end of the surgical cartridge buttress “B1” from cartridge body 412. During use, as the firing stroke of surgical instrument 100 is nearing completion and as actuation sled 418 approaches a distal end of longitudinally extending knife slot 412 bc of cartridge body 412, actuation sled 418 contacts the living hinge connection between first leg member 474 b and second leg member 474 c. As actuation sled 418 is further advanced distally, actuation sled 418 presses against the living hinge connection, causing first leg member 474 b and second leg member 474 c to extend. As first leg member 474 b and second leg member 474 c extend, piston 474 e is translated through recess 472 c of retainer 472. As piston 474 e is translated through recess 472 c of retainer 472, piston 474 e engages the second end of suture anchor “S2” and urges the second end of suture anchor “S2” out of the distal recess 412 d of cartridge body 412 that is in registration therewith to release the second end of suture anchor “S2” therefrom. With the second end of suture anchor “S2” released or free from distal recess 412 d of cartridge body 412, the distal end of the surgical cartridge buttress “B1” is free to separate from the tissue contacting surface of cartridge body 412.
As seen in FIG. 28, upper jaw 442 further includes a surgical anvil buttress “B2”, pledget or the like operatively secured to an upper surface or tissue contacting surface thereof, by anchors “S3” and “S4”, to overlie at least some of the plurality of staple forming pockets and/or at least a portion of a length of a longitudinally extending knife slot of anvil plate 443. The anchors may comprise surgical sutures. In particular, a suture anchor “S3” is cinched around a proximal portion of surgical anvil buttress “B2” and each of the proximal pair of recesses and a suture anchor “S4” is cinched around a distal portion of the surgical anvil buttress “B2” and each of a distal pair of recesses 443 a formed in opposed side edges of anvil plate 443.
In one particular embodiment, a first end of suture anchor “S3” includes a knot, stop or the like (not shown) sized so as to not pass through one recess of the proximal pair of recesses and a second end of suture anchor “S3” passes over, and transversely across, surgical anvil buttress “B2”, at least once, and back through the other recess of the proximal pair of recesses. For example, the second end of suture anchor “S3” may be pinched or cinched in the other recess of the proximal pair of recesses so as to anchor the second end of the suture anchor “S3” and secure the surgical anvil buttress “B2” against the tissue contacting surface of anvil plate 443. Similarly, a suture anchor “S4” is used to extend transversely across surgical anvil buttress “B2” and into engagement with the distal pair of recesses 443 a.
Surgical anvil buttress “B2” includes a proximal pair of notches formed in side edges aligned with the proximal pair of recesses of anvil plate 443, a distal pair of notches formed in side edges thereof aligned with the distal pair of recesses 443 a of anvil plate 443, and a proximal notch formed in a proximal edge thereof aligned with longitudinally extending knife slot when anvil buttress “B2” is secured to anvil plate 443. Anvil buttress “B2” further includes a tongue or tab extending from a distal edge thereof to facilitate with the attachment of anvil buttress “B2” to anvil plate 443 during the assembly process. It is contemplated that the tongue is removed from anvil buttress “B2” following securement of anvil buttress “B2” to anvil plate 443 and prior to packaging or shipment.
As seen in FIGS. 28 and 48-49, upper jaw 442 of jaw assembly 430 includes a suture release assembly 474 disposed between anvil plate 443 and cover housing 444 at a location in operative registration with a distal pair of side recesses 443 a. Suture release assembly 474 includes a link arm 475 pivotally connected to anvil plate 443 and/or optionally cover housing 444. Link arm 475 includes a body portion 475 a defining a pocket or recess 475 c formed in a first side edge 475 b thereof and a camming surface 475 d defined substantially along an adjacent side or proximal edge thereof. Pocket 475 c has a substantially arcuate, circular or rounded profile and defines an arcuate relief 475 e in a side wall thereof. Link arm 475 includes a pivot pin extending from body portion 475 a for pivotally connecting link arm 475 to upper jaw 442.
Release assembly 474 further includes a pusher bar 477 pivotally connected to link arm 475 and slidably disposed between anvil plate 443 and cover housing 444. Pusher bar 477 includes a body portion 477 a having a substantially rectangular configuration and a head 477 b, extending from a corner of body portion 477 a, and having a substantially circular or rounded configuration. Head 477 b of pusher bar 477 is configured and dimensioned for pivotable and/or rotatable connection in pocket 475 c of link arm 475. Head 477 b of pusher bar 477 includes a stop member 477 d projecting from a side edge thereof and into arcuate relief 475 e of pocket 475 c of link arm 475. A relative distance of rotation of pusher bar 477 relative to link arm 475 is determined by a relative length of arcuate relief 475 e and a relative width of stop member 477 d.
As seen in FIG. 48, suture release assembly 474 includes an unactuated configuration wherein pusher bar 477 does not extend into or overlie the respective one of the pair of distal recesses 443 a in operative registration therewith, and a longitudinal axis of link arm 475 is oriented substantially parallel with a longitudinal axis of upper jaw 442. It is contemplated that suture release assembly 474 may include a friction fit or snap fit feature for maintaining and/or retaining suture release assembly 474 in the locking or anchoring configuration at all times following the manufacturing/assembly process and prior to a complete firing of the surgical stapling apparatus.
As seen in FIG. 49, suture release assembly 474 includes an actuated configuration wherein pusher bar 477 extends into or overlies the respective one of the pair of distal recesses 443 a in operative registration therewith, and a longitudinal axis of link arm 475 is oriented substantially transverse to the longitudinal axis of upper jaw 442.
With reference to FIGS. 28 and 34-43, in operation, with a surgical anvil buttress (not shown) secured against the lower surface of anvil plate 443, during firing of the surgical stapling apparatus, as drive beam 466 is advanced (i.e., moved from a proximal-most position to a distal-most position), knife blade 450 a slices through a central section of the proximal suture (not shown), thereby freeing the proximal end of the surgical anvil buttress (not shown) from upper jaw 442. During use, as the firing stroke of the surgical instrument is nearing completion and as drive beam 466 approaches a distal-most end of the knife slot of anvil plate 443, as seen in FIG. 49, actuation sled 418 contacts camming surface 475 d of link arm 475, thus urging link arm 475 to rotate or pivot around the pivot pin and, in turn, urging pusher bar 477 to translate in the direction of the slot. As pusher bar 477 is translated, pusher bar 477 comes into contact with and urges the second end of suture “S4” out of the distal recess 443 a that is registration therewith to release the second end of suture “S4” therefrom. With the second end of surgical suture “S4” released or free from distal recess 443 a, the distal end of the surgical anvil buttress “B2” is free to separate from the tissue contacting surface of anvil plate 443.
Exemplary surgical buttresses “B” for use with the staple cartridge assembly 410 and/or anvil plate 443 disclosed herein are shown and described in commonly assigned U.S. Pat. Nos. 5,542,594, 5,908,427, 5,964,774, 6,045,560, and 7,823,592; commonly assigned U.S. application Ser. No. 12/579,605, filed on Oct. 15, 2009 (now U.S. Patent Publication No. 20110089220); commonly assigned U.S. application Ser. No. 11/241,267, filed on Sep. 30, 2005 (now U.S. Patent Publication No. 2006/0085034); and U.S. application Ser. No. 13/097,194, filed on Apr. 29, 2011, entitled “Surgical Stapling Apparatus;” the entire contents of each of which being incorporated herein by reference.
As seen in FIG. 55, rack 1274 is attached to a threaded shaft 1272 a extending proximally therefrom and threaded shaft 1272 a is in threaded engagement with a distal end of an internally threaded nut 1278. Threaded nut 1278 is rotatably supported and axially fixed within a pocket 1232 a (FIGS. 65 and 66) formed in proximal neck housing 1232. A proximal end of threaded nut 1278 is keyed to a distal end of third drive shaft 228 (see FIG. 5). While threaded shaft 1272 a is shown extending from rack 1274, it is understood, and within the scope of the present disclosure, that the threaded shaft may extend from rack 1272 without departing from the principles of the present disclosure.
In operation, to articulate neck assembly 230 in a first direction, the third drive shaft 228 is rotated in a first direction, as described above, to rotate threaded nut 1278 and axially displace threaded shaft 1272 a distally to axially displace rack 1274 distally. As rack 1274 is displaced axially in a distal direction, rack 1274 causes pinion gear 1276 to be rotated and to thus act on rack 1272, to axially displace rack 1272 in a proximal direction. As rack 1272 is axially displaced in a proximal direction, rack 1272 causes articulation cable 262 to be drawn in a proximal direction and thereby articulate neck assembly 230, in a manner similar to or identical to that which is shown in FIG. 16. Neck assembly 230 is articulated since axial displacement of rack 1274, in a distal direction, results in axial, distal displacement of articulation cable 264.
Clutch mechanism 1360 includes a rotatable coupling member 1362 rotatably supported in a proximal hub 1232 a of proximal neck housing 1232. See FIG. 64. Coupling member 1362 includes a first end 1362 a configured to receive and mate with first output drive shaft 246 a of transmission housing 212 of shaft assembly 200. Coupling member 1362 includes a second end 1362 b having a pair of distally extending arms 1362 c, each defining a pair of camming surfaces.
Clutch mechanism 1360 includes a plunger member 1364 rotatably and slidably supported in proximal hub 1232 a of proximal neck housing 1232. Plunger member 1364 includes a first end 1364 a having a pair of proximally extending arms 1364 c, each defining a pair of camming surfaces. The camming surfaces of the plunger member 1364 complementing and being in cooperative engagement with the camming surfaces of coupling member 1362. Plunger member 1364 includes a second end 1364 b secured to second drive cable 268.
Clutch mechanism 1360 includes a coupler 1366 axially fixed relative to proximal hub 1232 a of proximal neck housing 1232. Coupler 1366 is configured to receive second end 1362 b of coupling member 1362 and first end 1364 a of plunger member 1364 and maintain second end 1362 b of coupling member 1362 and first end 1364 a of plunger member 1364 in operative association with one another. Coupler 1366 defines an angled inner-annular surface 1366 a for mating with an angled outer annular profile of first end 1364 a of plunger member 1364.
Clutch mechanism 1360 includes a biasing member 1368 interposed between a surface of proximal hub 1232 a of proximal neck housing 1232 and plunger member 1364, tending to urge plunger member 1364 toward coupling member 1362 and tending to maintain second end 1362 b of coupling member 1362 and first end 1364 a of plunger member 1364 in operative association with one another. The biasing member presses the plunger member against the coupling member so that the camming surfaces of the plunger member in engagement with the camming surfaces of the coupling member.
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Clasificación internacional A61B17/068, A61B17/29, A61B17/00, A61B17/072, A61B17/32
Clasificación cooperativa A61B17/00234, A61B17/29, A61B17/07207, A61B2017/00685, A61B2017/2923, A61B2090/0814, A61B2017/00314, A61B2017/00398, A61B2034/715, A61B2017/00473, A61B2017/07285, A61B2017/07278, A61B2017/2908, A61B17/07292, A61B2017/07214, A61B2017/07271, A61B2017/320052, A61B2017/00327, A61B2017/00734, A61B2017/0046
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOSTRZEWSKI, STANISLAW;ARANYI, ERNEST;SCIRICA, PAUL;SIGNING DATES FROM 20130501 TO 20130502;REEL/FRAME:030391/0272