Devices and methods for manually retracting a drive shaft, drive beam, and associated components of a surgical fastening device
View Patent ↗A surgical fastening device provides a mechanism for manually retracting the drive shaft, drive beam, and associated components in the event of a jamming or misfiring condition. The device includes a handle housing from which an elongate shaft extends and an end effector at a distal end of the shaft. The end effector has a cartridge jaw and an anvil jaw in a pivoting arrangement. A drive shaft actuates a drive beam, which acts to drive fasteners from the cartridge jaw into tissue. The device include a first retraction mechanism configured to move linearly and proximally to retract the drive beam and drive shaft, and a second retraction mechanism that likewise is able to retract the drive beam and drive shaft.
1. A surgical fastening device, comprising:
a handle assembly including a housing and a movable handle;
an elongate shaft extending from the handle assembly;
an end effector at a distal end of the elongate shaft, the end effector having an anvil and a staple cartridge containing a plurality of staples rotatably deployable into tissue;
a drive assembly configured to move relative to the staple cartridge and the anvil to eject the staples from the staple cartridge;
an actuation assembly extending through the housing and the elongate shaft and having a rack formed thereon, the movable handle having a pawl configured to engage the rack on the actuation assembly to move the actuation assembly in response to movement of the movable handle, wherein movement of the actuation assembly drives the drive assembly relative to the staple cartridge and anvil to eject the staples from the staple cartridge;
a pair of retraction levers linearly slidable relative to the housing and coupled to the actuation assembly for retracting the actuation assembly and thus the drive assembly; and
a retraction gear coupled to the rack and rotatably disposed within the housing such that rotation of the retraction gear retracts the actuation assembly and the drive assembly, wherein the retraction gear has at least one tooth formed thereon that engages the rack formed on the actuation assembly.
2. The device of claim 1 , wherein the pair of retraction levers are each slidably disposed within an elongate slot formed in the housing.
3. The device of claim 1 , further comprising a tool configured to removably engage the retraction gear to cause rotation of the gear.
4. The device of claim 3 , wherein the tool comprises a wrench.
5. The device of claim 3 , wherein the housing includes an opening formed therein for allowing insertion of the tool therethrough for coupling with the gear.
6. The device of claim 1 , further comprising a lever fixedly coupled to the retraction gear and rotatable relative to the housing to rotate the retraction gear.
7. The device of claim 1 , wherein the plurality of staples are frangibly coupled to a carrier.
8. The device of claim 1 , wherein each of the plurality of staples is D-shaped.
9. A surgical fastening device, comprising:
a handle assembly including a housing and a movable handle;
an elongate shaft extending from the handle assembly;
an end effector at a distal end of the elongate shaft, the end effector having an anvil and a staple cartridge containing a plurality of staples rotatably deployable into tissue;
a drive assembly configured to move relative to the staple cartridge and the anvil to eject the staples from the staple cartridge;
an actuation assembly extending through the housing and the elongate shaft and having a rack formed thereon, the movable handle having a pawl configured to engage the rack on the actuation assembly to move the actuation assembly in response to movement of the movable handle, wherein movement of the actuation assembly drives the drive assembly relative to the staple cartridge and anvil to eject the staples from the staple cartridge;
a pair of retraction levers linearly slidable relative to the housing and coupled to the actuation assembly for retracting the actuation assembly and thus the drive assembly;
a retraction gear coupled to the rack and rotatably disposed within the housing such that rotation of the retraction gear retracts the actuation assembly and the drive assembly; and
a tool configured to removably engage the retraction gear and to cause rotation of the gear.
10. The device of claim 9 , wherein the pair of retraction levers are each slidably disposed within an elongate slot formed in the housing.
11. The device of claim 9 , wherein the tool comprises a wrench.
12. The device of claim 9 , wherein the housing includes an opening formed therein for allowing insertion of the tool therethrough.
13. The device of claim 9 , wherein the plurality of staples are frangibly coupled to a carrier.
14. The device of claim 9 , wherein each of the plurality of staples is D-shaped.
15. A surgical fastening device, comprising:
a handle assembly including a housing and a movable handle;
an elongate shaft extending from the handle assembly;
an end effector at a distal end of the elongate shaft, the end effector having an anvil and a staple cartridge containing a plurality of staples rotatably deployable into tissue;
a drive assembly configured to move relative to the staple cartridge and the anvil to eject the staples from the staple cartridge;
an actuation assembly extending through the housing and the elongate shaft and having a rack formed thereon, the movable handle having a pawl configured to engage the rack on the actuation assembly to move the actuation assembly in response to movement of the movable handle, wherein movement of the actuation assembly drives the drive assembly relative to the staple cartridge and anvil to eject the staples from the staple cartridge;
a pair of retraction levers linearly slidable relative to the housing and coupled to the actuation assembly for retracting the actuation assembly and thus the drive assembly;
a retraction gear coupled to the rack and rotatably disposed within the housing such that rotation of the retraction gear retracts the actuation assembly and the drive assembly; and
a lever fixedly coupled to the retraction gear and rotatable relative to the housing such that rotation of the lever relative to the housing causes rotation of the retraction gear.
16. The device of claim 15 , further comprising a wrench configured to removably engage the retraction gear to cause rotation of the gear.
17. The device of claim 16 , wherein the wrench is configured to be inserted through an opening formed in the housing for coupling with the gear.
18. The device of claim 15 , wherein the plurality of staples are frangibly coupled to a carrier.
19. The device of claim 15 , wherein each of the plurality of staples is D-shaped.