Circular stapler and staple line reinforcement material

1. A method of assembling a surgical stapling instrument, the method comprising the steps of:

providing a staple cartridge assembly having a tissue contacting surface including a plurality of rows of staple receiving slots,

providing an anvil assembly having an anvil member with a tissue contacting surface defining a plurality of rows of staple forming recesses, the staple cartridge assembly, the anvil assembly, or both, having one or more attachment members attached to the tissue contacting surface of the staple cartridge assembly, the anvil assembly, or both;

providing staple line reinforcement material;

securing the staple line reinforcement material to the attachment members by ultrasonic welding, wherein the ultrasonic welding is between the staple line reinforcement material and the attachment members.

2. The method according to claim 1 , further comprising the step of releasably attaching the staple line reinforcement material to the attachment members by ultrasonic welding.

3. The method according to claim 1 , further comprising the step of providing staple line reinforcement material that defines perforations adjacent the attachment members.

4. The method according to claim 1 , wherein the step of providing a staple cartridge assembly includes the step of providing a staple cartridge assembly having a plurality of rows arranged in circular rows.

5. The method according to claim 4 , wherein the step of providing an anvil assembly includes the step or providing an anvil assembly having a plurality of rows of staple forming recesses arranged in circular rows.

6. The method according to claim 1 , further comprising the step of forming the one or more attachment members on the anvil member by molding plastic.

7. The method according to claim 1 , further comprising the steps of:

providing a metal anvil member;

providing plastic attachment members; and

disposing the one or more attachment members on the anvil member.

8. The method according to claim 5 , further comprising the step of disposing the one or more attachment members on the staple cartridge assembly at a location outwardly of the rows of staple receiving slots.

9. The method according to claim 8 , further comprising the steps of:

attaching the staple line reinforcement material to the one or more attachment members; and

defining perforations adjacent the one or more attachment members.

10. The method according to claim 5 , further comprising the step of disposing the one or more attachment members on the anvil assembly at a location outwardly of the rows of staple forming recesses.

11. The method according to claim 10 , further comprising the steps of:

attaching the staple line reinforcement material to the one or more attachment members; and

defining perforations adjacent the one or more attachment members.

12. The method according to claim 1 , further comprising the steps of:

providing an anvil assembly including, a shaft;

providing a tubular body portion including a rod;

mounting the staple cartridge assembly in the tubular body portion by attaching the shaft of the anvil assembly to the rod of the tubular body portion.

13. The method according to claim 1 , further comprising the step of disposing the attachment members between adjacent staple forming recesses of the anvil member.

14. The method according to claim 1 , further comprising the step of disposing the attachment members flush with the tissue contacting surface of the anvil member.

15. The method according to claim 1 , further comprising the step of forming the attachment members from a polymeric material.