Surgical stapling system comprising a spent cartridge lockout

1. A stapling assembly, comprising:

a shaft comprising a shaft frame;

a staple cartridge attachable to said shaft frame, wherein said staple cartridge comprises:

a circular cartridge body;

staple cavities arranged in a circular array in said circular cartridge body; and

staples removable stored in said staple cavities;

a staple driver configured to eject said staples from said staple cavities, wherein said staple driver comprises a lock;

an anvil configured to deform said staples; and

a rotatable firing shaft operably engaged with said staple driver, wherein said firing shaft is rotatable in a first direction and a second direction, wherein said firing shaft is configured to move said staple driver toward said anvil when said firing shaft is rotated in said first direction, wherein said firing shaft is configured to retract said staple driver away from said anvil when said firing shaft is rotated in said second direction, wherein said lock is configured to engage said shaft frame when said staple driver is retracted by said firing shaft, and wherein said lock is configured to prevent said firing shaft from rotating in said first direction once said lock is engaged with said shaft frame.

2. The stapling assembly of claim 1 , wherein said lock is configured to prevent said firing shaft from rotating in said second direction once said lock is engaged with said shaft frame.

3. The stapling assembly of claim 1 , wherein said staple driver is moved through a firing stroke by said firing shaft when said firing shaft is rotated in said first direction.

4. The stapling assembly of claim 3 , wherein said staple cartridge further comprises a distal end, wherein said staple driver moves toward said distal end between an unfired position and a fired position during said firing stroke, wherein said staple driver moves away from said distal end between said fired position and a retracted position when said staple driver is retracted by said firing shaft, and wherein said unfired position is closer to said distal end than said retracted position.

5. The stapling assembly of claim 1 , wherein said shaft frame comprises a shaft aperture, and wherein said lock comprises a pin and a spring configured to bias said pin into said shaft aperture when said staple driver is in a retracted position.

6. The stapling assembly of claim 5 , wherein said staple driver further comprises a second lock, wherein said second lock is configured to engage said shaft frame when said staple driver is retracted by said firing shaft, and wherein said second lock is configured to prevent said firing shaft from rotating in said first direction once said second lock is engaged with said shaft frame.

7. The stapling assembly of claim 6 , wherein said shaft aperture comprises a first shaft aperture, wherein said pin comprises a first pin, wherein said shaft frame comprises a second shaft aperture, and wherein said second lock comprises a second pin and a second spring configured to bias said second pin into said second shaft aperture when said staple driver is in a retracted position.

8. The stapling assembly of claim 7 , wherein said first pin comprises a first configuration, wherein said second pin comprises a second configuration which is different than said first configuration, wherein said first pin cannot fit into said second shaft aperture, and wherein said second pin cannot fit into said first shaft aperture.

9. A staple cartridge for use with a surgical stapling instrument having an anvil, said staple cartridge comprising:

a frame;

a circular cartridge body;

staple cavities arranged in a circular array in said circular cartridge body;

staples removable stored in said staple cavities;

a staple driver configured to eject said staples from said staple cavities, wherein said staple driver comprises a lock; and

a rotatable firing shaft operably engaged with said staple driver, wherein said firing shaft is rotatable in a first direction and a second direction, wherein said firing shaft is configured to move said staple driver toward the anvil when said firing shaft is rotated in said first direction, wherein said firing shaft is configured to retract said staple driver away from the anvil when said firing shaft is rotated in said second direction, wherein said lock is configured to engage said frame when said staple driver is retracted by said firing shaft, and wherein said lock is configured to prevent said firing shaft from rotating in said first direction once said lock is engaged with said frame.

10. The staple cartridge of claim 9 , wherein said lock is configured to prevent said firing shaft from rotating in said second direction once said lock is engaged with said frame.

11. The staple cartridge of claim 9 , wherein said staple driver is moved through a firing stroke by said firing shaft when said firing shaft is rotated in said first direction.

12. The staple cartridge of claim 11 , further comprising a distal end, wherein said staple driver moves toward said distal end between an unfired position and a fired position during said firing stroke, wherein said staple driver moves away from said distal end between said fired position and a retracted position when said staple driver is retracted by said firing shaft, and wherein said unfired position is closer to said distal end than said retracted position.

13. The staple cartridge of claim 12 , wherein said frame comprises a lock aperture, and wherein said lock comprises a pin and a spring configured to bias said pin into said lock aperture when said staple driver is in said retracted position.

14. The staple cartridge of claim 13 , wherein said staple driver further comprises a second lock, wherein said second lock is configured to engage said frame when said staple driver is retracted by said firing shaft, and wherein said second lock is configured to prevent said firing shaft from rotating in said first direction once said second lock is engaged with said frame.

15. The staple cartridge of claim 14 , wherein said lock aperture comprises a first lock aperture, wherein said pin comprises a first pin, wherein said frame comprises a second lock aperture, and wherein said second lock comprises a second pin and a second spring configured to bias said second pin into said second lock aperture when said staple driver is in said retracted position.

16. The staple cartridge of claim 15 , wherein said first pin comprises a first configuration, wherein said second pin comprises a second configuration which is different than said first configuration, wherein said first pin cannot fit into said second lock aperture, and wherein said second pin cannot fit into said first lock aperture.

17. A staple cartridge for use with a surgical stapling instrument having an anvil, said staple cartridge comprising:

a frame;

a circular cartridge body;

staple cavities arranged in a circular array in said circular cartridge body;

staples removable stored in said staple cavities;

a staple driver configured to eject said staples from said staple cavities;

a firing member operably engaged with said staple driver, wherein said firing member is movable in a first direction and a second direction, wherein said firing member is configured to move said staple driver toward the anvil when said firing member is moved in said first direction, wherein said firing member is configured to retract said staple driver away from the anvil when said firing member is moved in said second direction; and

a firing member lockout, wherein said lockout is configured to couple said firing member and said frame when said staple driver is retracted by said firing member, and wherein said lockout is configured to prevent said firing member from moving in said first direction once said lockout has coupled said firing member and said frame.

18. The staple cartridge of claim 17 , wherein said lockout is configured to prevent said firing member from moving in said second direction once said lockout has coupled said firing member and said frame.

19. The staple cartridge of claim 18 , wherein said staple driver is moved through a firing stroke by said firing member when said firing member is moved in said first direction.

20. The staple cartridge of claim 19 , further comprising a distal end, wherein said staple driver moves toward said distal end between an unfired position and a fired position during said firing stroke and toward a retracted position when said staple driver is retracted by said firing member, and wherein said unfired position is closer to said distal end than said retracted position.