Reusable circular stapler handle with open assembly architecture

1. A method for assembly of a circular stapling instrument comprising:

detachably securing a reciprocating drive shaft within an open-top cavity of a handle such that an open-top of the open-top cavity is configured to receive the reciprocating drive shaft therethrough;

detachably securing a firing bar within the open-top cavity of the handle such that the open-top of the open-top cavity is configured to receive the firing bar therethrough;

covering a portion of the reciprocating drive shaft and a portion of the firing bar within the open-top cavity of the handle with a one-piece carrier cover; and

detachably coupling a shaft assembly with a threaded end of the handle that is configured to be part of the open-top cavity.

2. The method of claim 1 , wherein the shaft assembly detachably secures the carrier cover to the handle.

3. The method of claim 1 further comprising:

receiving a tip of the reciprocating drive shaft through an opening of an engagement shaft of a firing bar.

4. The method of claim 3 , wherein an upper end of a firing trigger of the handle engages an engagement groove of the firing bar within the cavity of the handle.

5. The method of claim 1 further comprising detachably coupling an anvil closure knob with a threaded adjustment member of the reciprocating drive shaft.

6. The method of claim 1 further comprising detachably coupling a stapling cartridge assembly to the shaft assembly, wherein a tip of the reciprocating drive shaft extends through a central shaft formed in the stapling cartridge assembly.

7. The method of claim 6 further comprising detachably coupling an anvil assembly to an engagement member at the tip of the reciprocating drive shaft.