Reload assembly with knife carrier lockout

Patent metadata

Field	Value
Publication number	US-12004739-B2
Application number	US-202217961742-A
Country	US
Kind code	B2
Filing date	Oct 7, 2022
Priority date	Jul 26, 2019
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

A surgical stapling device includes a reload assembly that includes a locking member to retain a knife carrier of the reload assembly in a retracted position after the stapling device is fired. The locking member may be supported on an inner housing portion of the shell housing or on a staple pusher assembly of the reload assembly.

First claim

What is claimed is:

1. A surgical stapling device comprising:
an adaptor assembly having a proximal end portion and a distal end portion; and
a reload assembly supported on the distal end portion of the adaptor assembly, the reload assembly including:
a shell housing including an outer housing portion and an inner housing portion;
a staple cartridge supporting staples;
a staple pusher supported movable from a retracted position to an advanced position to eject the staples from the staple cartridge;
a staple actuator positioned to engage the staple pusher, the staple actuator having a stop surface and movable from an actuator retracted position to an actuator advanced position to move the staple pusher from a pusher retracted position to a pusher advanced position to eject the staples from the staple cartridge, the staple actuator and the staple pusher defining a through bore;
a knife carrier supported within the through bore and movable between a carrier retracted position and a carrier advanced position, the knife carrier defining a longitudinal axis and supporting a locking member that is formed from a resilient material, the locking member aligned with the stop surface of the staple actuator when the staple actuator is in the actuator advanced position and the knife carrier is in the carrier retracted position to prevent readvancement of the knife carrier; and
a knife supported on the knife carrier.

2. The surgical stapling device of claim 1 , further including a handle assembly, the proximal end portion of the adaptor assembly supported on the handle assembly.

3. The surgical stapling device of claim 1 , wherein the locking member is movable from an undeformed state in which the locking member extends outwardly and distally from the knife carrier to a deformed state in which the locking member is substantially aligned with the longitudinal axis of the knife carrier.

4. The surgical stapling device of claim 3 , wherein the locking member is positioned distally of the stop surface of the staple actuator when the staple actuator is in the actuator retracted position and the knife carrier is in the carrier retracted position, the locking member movable from the undeformed state to the deformed state to allow the locking member to move proximally past the stop surface when the staple actuator is in the actuator advanced position and the knife carrier is moved from the carrier advanced position to the carrier retracted position.

5. The surgical stapling device of claim 3 , wherein the locking member is supported on the knife carrier in cantilevered fashion.

6. The surgical stapling device of claim 5 , wherein the locking member is formed from a flat leaf spring.

7. The surgical stapling device of claim 5 , wherein the locking member is formed from wire having a cylindrical cross-section.

8. The surgical stapling device of claim 1 , wherein the knife carrier includes a hook member, the hook member aligned with the stop surface of the staple actuator such that movement of the knife carrier from the carrier retracted position to the carrier advanced position moves the staple actuator from the actuator retracted position to the carrier advanced position.

9. The surgical stapling device of claim 1 , further including a coupling mechanism, the coupling mechanism coupling the reload assembly to the adaptor assembly to facilitate release of the reload assembly from the adaptor assembly.

10. A reload assembly comprising:
a shell housing including an outer housing portion and an inner housing portion;
a staple cartridge supporting staples;
a staple pusher supported within the shell housing and movable from a retracted position to an advanced position to eject the staples from the staple cartridge;
a staple actuator supported within the shell housing and positioned to engage the staple pusher, the staple actuator having a stop surface and movable from an actuator retracted position to an actuator advanced position to move the staple pusher from a pusher retracted position to a pusher advanced position to eject the staples from the staple cartridge, the staple actuator and the staple pusher defining a through bore;
a knife carrier supported within the through bore and movable between a carrier retracted position and a carrier advanced position, the knife carrier defining a longitudinal axis and supporting a locking member formed of a resilient material, the locking member aligned with the stop surface on the staple actuator when the staple actuator is in the actuator advanced position and the knife carrier is in the carrier retracted position to prevent readvancement of the knife carrier; and
a knife supported on the knife carrier.

11. The reload assembly of claim 10 , wherein the shell housing defines a cavity, and the staple pusher, the staple actuator, and the knife carrier are supported within the cavity.

12. The reload assembly of claim 10 , wherein the locking member is movable from an undeformed state in which the locking member extends outwardly and distally from the knife carrier to a deformed state in which the locking member is substantially aligned with the longitudinal axis of the knife carrier.

13. The reload assembly of claim 12 , wherein the locking member is positioned distally of the stop surface of the staple actuator when the staple actuator is in the actuator retracted position and the knife carrier is in the carrier retracted position, the locking member movable from the undeformed state to the deformed state to allow the locking member to move proximally past the stop surface when the staple actuator is in the actuator advanced position and the knife carrier is moved from the carrier advanced position to the carrier retracted position.

14. The reload assembly of claim 13 , wherein the locking member is supported on the knife carrier in cantilevered fashion.

15. The reload assembly of claim 10 , wherein the knife carrier includes a hook member, the hook member aligned with the stop surface of the staple actuator such that movement of the knife carrier from the carrier retracted position to the carrier advanced position moves the staple actuator from the actuator retracted position to the carrier advanced position.

16. The reload assembly of claim 15 , wherein the locking member is formed from a flat leaf spring.

17. The reload assembly of claim 16 , wherein the locking member is formed from wire having a cylindrical cross-section.

18. The reload assembly of claim 10 , further including a coupling mechanism, the coupling mechanism adapted to releasably couple the reload assembly to an adaptor assembly of a stapling device to facilitate release of the reload assembly from the stapling device.

19. A reload assembly comprising:
a shell housing;
an annular staple cartridge supporting staples;
a staple actuator supported within the shell housing, the staple actuator having a stop surface and movable from an actuator retracted position to an actuator advanced position to eject the staples from the staple cartridge, the staple actuator defining a through bore;
a knife carrier supported within the through bore and movable between a carrier retracted position and a carrier advanced position, the knife carrier defining a longitudinal axis and supporting a resilient locking member, the resilient locking member aligned with the stop surface on the staple actuator when the staple actuator is in the actuator advanced position and the knife carrier is in the carrier retracted position to prevent readvancement of the knife carrier; and

Assignees

• Covidien Lp

Inventors

• Valentine David
• Eisinger Joseph
• Cabrera Ramiro
• Mozdzierz Patrick
• Penna Christopher
• Williams Justin

Classifications

• A61B2017/07285

  characterised by its cutter · CPC title

• A61B2017/07257

  characterised by its anvil · CPC title

• A61B17/1155 Primary

  Circular staplers comprising a plurality of staples · CPC title

• A61B90/98

  using electromagnetic means, e.g. transponders · CPC title

• A61B90/03

  Automatic limiting or abutting means, e.g. for safety · CPC title