Reusable circular stapler handle with open assembly architecture

1. A circular stapling instrument comprising:

a reciprocating drive shaft having an engagement member at a tip of the reciprocating drive shaft and a threaded adjustment member at a base of the reciprocating drive shaft;

a firing bar forming an engagement member and having an engagement shaft that forms an opening through which the tip of the reciprocating drive shaft is received;

a handle having a threaded end, a firing trigger, and an open-top cavity, wherein the threaded end is part of the open-top cavity, and the open-top cavity receives the firing bar and the reciprocating drive shaft through an open-top, wherein an upper end of the firing trigger engages the engagement member and detachably secures the firing bar and the reciprocating drive shaft within the open-top cavity of the handle;

a one-piece carrier cover comprising a carrier cover shaft that forms a carrier cover opening through which the tip of the reciprocating drive shaft is received, wherein when the one-piece carrier cover is attached to the handle the one-piece carrier cover covers a portion of the firing bar and the reciprocating drive shaft disposed within the open-top cavity of the handle; and

a shaft assembly threadedly coupled to the threaded end of the handle.

2. The circular stapling instrument of claim 1 , further comprising an anvil assembly detachably coupled with the engagement member at the tip of the reciprocating drive shaft.

3. The circular stapling instrument of claim 1 , wherein the one-piece carrier cover forms a second opening through which the threaded end of the handle is received.

4. The circular stapling instrument of claim 1 , wherein the shaft assembly has a connecting nut which is threadedly coupled to the threaded end on the handle.

5. The circular stapling instrument of claim 1 further comprising an anvil closure knob detachably coupled with the threaded adjustment member of the reciprocating drive shaft.

6. The circular stapling instrument of claim 1 further comprising a stapling cartridge assembly detachably coupled with the shaft assembly, wherein the tip of the reciprocating drive shaft extends through a central shaft formed in the stapling cartridge assembly.

7. The circular stapling instrument of claim 1 , wherein the open-top cavity is U-shaped.

8. The circular stapling instrument of claim 1 , wherein the one-piece carrier cover comprises two carrier cover side-surfaces, a top carrier surface, and an open-bottom comprising a second opening.

9. The circular stapling instrument of claim 8 , wherein the one-piece carrier cover is U-shaped and is adapted to cover the open-top cavity of the handle with the top carrier surface disposed over the open-top of the handle and the two carrier cover side-surfaces disposed over respective side-surfaces of the handle.

10. The circular stapling instrument of claim 1 wherein when the one-piece carrier cover is separated from the handle the firing bar and the reciprocating drive shaft are detachably secured within the open-top cavity of the handle with two side-surfaces of the handle extending over a top of the firing bar.

11. A circular stapling instrument comprising:

a handle comprising a threaded end and an open-top cavity, wherein the threaded end is part of the open-top cavity;

a reciprocating drive shaft detachably secured within the open-top cavity of the handle, the reciprocating drive shaft configured to be removed through an open-top of the open-top cavity of the handle;

a one-piece carrier cover comprising a carrier cover shaft that forms a carrier cover opening through which a tip of the reciprocating drive shaft is received, wherein when the one-piece carrier cover is attached to the handle the one-piece carrier cover covers a portion of the reciprocating drive shaft disposed within the open-top cavity of the handle; and

a shaft assembly threadedly coupled to the threaded end of the handle.

12. The circular stapling instrument of claim 11 , wherein the one-piece carrier cover is detachably secured to the handle by the shaft assembly.

13. The circular stapling instrument of claim 11 further comprising:

a firing bar having an engagement shaft which forms an opening, wherein the tip of the reciprocating drive shaft is received through the opening of the engagement shaft, and wherein both the firing bar and the reciprocating drive shaft are detachably secured within the open-top cavity of the handle and adapted to be removed through the open-top of the open-top cavity of the handle.

14. The circular stapling instrument of claim 13 , wherein the handle includes a firing trigger having an upper end, and wherein the upper end of the firing trigger engages an engagement member of the firing bar within the open-top cavity of the handle.

15. The circular stapling instrument of claim 11 further comprising an anvil closure knob detachably coupled with a threaded adjustment member of the reciprocating drive shaft.

16. The circular stapling instrument of claim 11 further comprising a stapling cartridge assembly detachably coupled with the shaft assembly, wherein the tip of the reciprocating drive shaft extends through a central shaft formed in the stapling cartridge assembly.

17. The circular stapling instrument of claim 16 further comprising an anvil assembly detachably coupled with an engagement member at the tip of the reciprocating drive shaft.

18. The circular stapling instrument of claim 11 , wherein the open-top cavity is U-shaped.

19. The circular stapling instrument of claim 11 , wherein the one-piece carrier cover comprises two carrier cover side-surfaces, a top carrier surface, and an open-bottom comprising a second opening.

20. The circular stapling instrument of claim 19 , wherein the one-piece carrier cover is U-shaped and is adapted to cover the open-top cavity of the handle with the top carrier surface disposed over the open-top of the handle and the two carrier cover side-surfaces disposed over respective side-surfaces of the handle.

21. The circular stapling instrument of claim 11 wherein when the one-piece carrier cover is separated from the handle the reciprocating drive shaft is detachably secured within the open-top cavity of the handle with two side-surfaces of the handle extending over a top of the reciprocating drive shaft.