Circular stapling apparatus with pinned buttress

1. A stapling apparatus, comprising:

a shell;

a staple cartridge supported on the shell, the staple cartridge having a tissue contact surface and supporting an array of fasteners therein;

a pusher positioned in the shell and configured to move relative to the staple cartridge to fire the fasteners from the staple cartridge; and

a buttress supported on the staple cartridge and including legs that extend from the buttress, the legs coupled to the pusher, the legs configured to separate from the pusher as the pusher moves relative to the staple cartridge.

2. The stapling apparatus of claim 1 , wherein the legs extend along an outer surface of the shell.

3. The stapling apparatus of claim 2 , wherein the shell defines windows in the outer surface thereof, the legs disposed in registration with the windows.

4. The stapling apparatus of claim 3 , wherein the legs include feet, wherein the feet are receivable through the windows and engageable with the pusher.

5. The stapling apparatus of claim 4 , wherein the feet are pinned to the pusher.

6. The stapling apparatus of claim 5 , wherein the feet define pin openings therethrough and the pusher defines pin holes therein, the pin openings configured to align with the pin holes so that pins are receivable through the pin openings and the pin holes to secure the feet to the pusher.

7. The stapling apparatus of claim 6 , wherein the pins are configured to tear the feet as the pusher moves relative to the staple cartridge to enable the buttress to separate from the staple cartridge.

8. The stapling apparatus of claim 6 , wherein the pusher defines recesses in registration with the pin holes, the feet disposed within the recesses.

9. The stapling apparatus of claim 1 , further comprising a knife movably supported in the shell to cut tissue supported on the staple cartridge.

10. The stapling apparatus of claim 1 , further comprising an anvil assembly that is selectively movable relative to the staple cartridge.

11. A circular stapling apparatus, comprising:

a staple cartridge having a tissue contact surface and supporting an array of fasteners therein;

a pusher configured to move relative to the staple cartridge to fire the fasteners from the staple cartridge; and

a buttress supported on the staple cartridge and selectively pinned to the pusher.

12. The circular stapling apparatus of claim 11 , wherein the buttress includes at least one leg that is pinned to the pusher.

13. The circular stapling apparatus of claim 12 , further comprising a shell that supports the staple cartridge and the pusher.

14. The circular stapling apparatus of claim 13 , wherein the shell defines at least one window in disposed in registration with the at least one leg of the buttress.

15. The circular stapling apparatus of claim 14 , wherein the at least one leg includes a foot, wherein the foot is receivable through the at least one window to engage the pusher.

16. The circular stapling apparatus of claim 15 , wherein the foot is pinned to the pusher by a hook.

17. The circular stapling apparatus of claim 16 , wherein the foot is configured to tear as the pusher moves relative to the staple cartridge.

18. The circular stapling apparatus of claim 11 , wherein the buttress includes at least three legs.

19. The circular stapling apparatus of claim 11 , further comprising a cylindrical knife positioned to move through the staple cartridge to cut tissue supported on the staple cartridge.

20. The circular stapling apparatus of claim 11 , further comprising an anvil head that is selectively movable relative to the staple cartridge to clamp tissue between the anvil head and the staple cartridge.