Circular stapling instrument
View Patent ↗A circular stapling instrument including a stapling forming assembly that is actuated independently from actuation of the cutting assembly is provided. The instrument includes a handle assembly, an elongate body extending from the handle assembly, a cartridge assembly mounted on a distal end of the elongate body. The cartridge assembly includes a pusher and a knife assembly. The knife assembly is selectively fixed relative to the pusher.
1. A circular stapler comprising:
a handle assembly;
an elongate body extending from the handle assembly; and
a cartridge assembly mounted on a distal end of the elongate body, the cartridge assembly including a plurality of staples, a pusher, and a knife assembly, wherein a first actuation of the handle assembly results in a first stroke during which the pusher is advanced to form the plurality of staples and thereafter, the pusher is retracted to fix the knife assembly relative to the pusher, and a second actuation of the handle assembly results in a second stroke during which the pusher advances the knife assembly, wherein the second stroke is independent of the first stroke.
2. The circular stapler of claim 1 , wherein the pusher is configured to be advanced a first distance and retracted a second distance, the second distance being greater than the first distance.
3. The circular stapler of claim 1 , wherein the pusher includes a groove formed about an inner surface thereof and the knife includes an actuator clip configured to selectively engage the groove.
4. The circular stapler of claim 1 , wherein during the first stroke the pusher is advanced independently of the knife assembly.
5. The circular stapler of claim 1 , wherein the cartridge assembly includes a housing having an outer cylindrical portion and an inner cylindrical portion.
6. The circular stapler of claim 5 , wherein the pusher and the knife assembly are selectively received between the inner and outer cylindrical portions of the housing.
7. The circular stapler of claim 6 , wherein the inner cylindrical portion includes a ridge on an outer surface thereof configured for selective engagement with an actuator clip of the knife assembly.
8. The circular stapler of claim 7 , wherein the actuator clip includes an inner surface configured for selectively engaging the ridge on the outer surface of the inner cylindrical portion.
9. The circular stapler of claim 8 , wherein the actuator clip includes an outer surface configured for selectively engaging a groove on an inner surface of the pusher.
10. The circular stapler of claim 1 , wherein the pusher and the knife assembly are substantially cylindrical.