An apparatus for application of surgical clips is provided and includes a lockout system selectively engageble with a pusher bar to prevent the pusher bar from returning to a home position and to prevent a trigger from completing a full stroke when a plurality of clips are substantially exhausted. T
An apparatus for application of surgical clips is provided and includes a lockout system selectively engageble with a pusher bar to prevent the pusher bar from returning to a home position and to prevent a trigger from completing a full stroke when a plurality of clips are substantially exhausted. The apparatus may include a trip mechanism including a trip lever biased into contact with the pusher bar, wherein distal movement of the drive bar moves the trip mechanism until the trip lever engages a lip of the pusher bar and in turn distally moves the pusher bar. The apparatus may include a wedge plate including a distal end placeable between spaced-apart jaw members, wherein the wedge plate is moved proximally to withdraw the distal end thereof from between the jaw members when a drive channel is moved in a distal direction.
대표청구항▼
1. An apparatus for application of surgical clips to body tissue, the apparatus comprising: a) a handle assembly;b) a shaft assembly extending distally from the handle assembly and defining a longitudinal axis;c) a plurality of surgical clips disposed within the shaft assembly;d) jaws mounted adjace
1. An apparatus for application of surgical clips to body tissue, the apparatus comprising: a) a handle assembly;b) a shaft assembly extending distally from the handle assembly and defining a longitudinal axis;c) a plurality of surgical clips disposed within the shaft assembly;d) jaws mounted adjacent a distal end portion of the shaft assembly, the jaws including a pair of jaw members movable between a spaced-apart and an approximated position;e) a clip pusher bar configured to individually distally advance a surgical clip to the jaws while the jaw members are in the spaced apart position;f) a drive bar at least partially disposed within the handle assembly and the shaft assembly, the drive bar being longitudinally movable in response to actuation of a trigger of the handle assembly;g) a drive channel positioned adjacent the first and second jaw members to move the jaw members to the approximated position; andh) a wedge plate slidably supported in the shaft assembly,wherein the wedge plate includes a distal end configured and dimensioned for placement between the jaw members when the jaw members are in the spaced-apart position and when the drive channel is in a proximal position, wherein the wedge plate is configured to wedge the jaw members to the spaced-apart position when the wedge plate is place between the jaw members, wherein the wedge plate is slidable relative to the pusher bar, wherein the wedge plate is slidable relative to the drive channel, andwherein when the handle assembly is actuated, the wedge plate is moved in a proximal direction to withdraw the distal end thereof from between the jaw members and move the drive channel in a distal direction. 2. The apparatus according to claim 1, further comprising a gear operatively disposed between the wedge plate and the drive channel, wherein the gear translates distal movement of the drive channel into proximal movement of the wedge plate and proximal movement of the drive channel into distal movement of the wedge plate. 3. The apparatus according to claim 1, wherein a delay is provided between the distal advancement of the drive bar and the distal advancement of the drive channel. 4. The apparatus according to claim 1, further comprising: a lockout system being at all times spaced a distance from a distal end of the shaft assembly, the lockout system being configured to selectively engage the clip pusher bar to prevent the clip pusher bar from returning to a home position and to prevent the trigger from completing a full stroke when the plurality of clips are substantially exhausted. 5. The apparatus according to claim 4, wherein the lockout system includes a pusher-bar latch mechanism supported in the shaft assembly, wherein a lock-out bar of the latch mechanism is actuated to engage the clip pusher bar when a final clip is exhausted, whereby the lock-out bar prevents the clip pusher bar from returning to the home position. 6. The apparatus according to claim 5, further comprising a clip follower slidably disposed within the shaft assembly at a location proximal of the plurality of clips, wherein the clip follower urges the lock-out bar of the pusher-bar latch mechanism into engagement with the clip pusher bar when the final clip is exhausted. 7. The apparatus according to claim 6, wherein the lockout system includes: a rack having a plurality of ratchet teeth and being secured to the drive channel; anda pawl having at least one tooth and being disposed at a location to selectively engage the rack, wherein the pawl is biased into engagement with the rack, wherein as the drive channel is longitudinally reciprocated, the plurality of teeth are passed over the pawl, and wherein the pawl prevents inadvertent return of the drive channel before full actuation of the apparatus. 8. The apparatus according to claim 7, wherein the lockout system includes: a latch member operatively engageable by the clip pusher bar and the drive channel, wherein the latch member includes a position that is out of engagement with the drive channel when the clip pusher bar is in the home position, and a position that is engaged with the drive channel when the clip pusher bar is in a non-home position,wherein when the clip pusher bar is prevented from returning to the home position by the lock-out bar, the latch member is engaged with drive channel and prevents the drive channel from moving proximally, whereby the plurality of teeth of the rack are maintained in engagement with the pawl. 9. The apparatus according to claim 1, further comprising a trip mechanism supported on the drive bar, the trip mechanism includes a trip lever biased into contact with the clip pusher bar, wherein distal movement of the drive bar moves the trip mechanism until the trip lever thereof engages a lip of the clip pusher bar and in turn distally moves the clip pusher bar. 10. The apparatus according to claim 1, further comprising a shear pin operatively connected to the drive bar to transmit axial forces to the drive bar during movement of the trigger, wherein the shear pin includes at least one region of reduced strength. 11. The apparatus according to claim 10, wherein the shear pin will fail at the at least one region of reduced strength when a minimum predetermined shear force is exerted on the shear pin. 12. The apparatus according to claim 1, wherein the wedge plate is configured to maintain the jaws in the spaced-apart position when the wedge plate is placed between the jaw members.
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이 특허에 인용된 특허 (456)
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