Surgical stapling device

1. A circular stapling device comprising:

a handle assembly;

a body portion having a proximal portion and a distal portion, the proximal portion of the body portion being connected to the handle assembly; and

a tool assembly supported on the distal portion of the body portion, the tool assembly including an anvil assembly and a shell assembly, the anvil assembly including a center rod and an anvil head assembly, the center rod having a proximal portion and a distal portion, the anvil head assembly being secured to the distal portion of the center rod and including a housing defining an outer annular recess, and a locking material positioned within the outer annular recess, the shell assembly including a shell housing and a staple cartridge, the staple cartridge supporting a plurality of staples that are axially aligned with the annular recess, each of the plurality of staples including a backspan and a leg extending from each end of the backspan, at least one of the legs including locking structure, the locking structure being configured to engage the locking material of the anvil head assembly upon penetration of the locking material by the legs of the staples to obstruct withdrawal of the legs from the locking material;

wherein the locking material includes a mesh material and the anvil head assembly includes a reinforcement material positioned over the locking material proximally of the mesh material.

2. The circular stapling device of claim 1 , wherein the housing includes a proximally facing surface that defines the outer annular recess, the reinforcement material is positioned on the proximally facing surface over the locking material.

3. The circular stapling device of claim 1 , wherein the locking structure includes teeth positioned along at least a portion of the at least one leg of the plurality of staples.

4. The circular stapling device of claim 3 , wherein each of the legs define a longitudinal axis and the teeth on each of the legs include a distal surface that defines an acute angle with the longitudinal axis of the legs, the distal surface of the teeth extending outwardly from the longitudinal axis in a proximal direction.

5. The circular stapling device of claim 4 , wherein the teeth on the at least one leg includes a proximal surface that is configured to engage the mesh material when the at least one leg of the plurality of staples penetrates the mesh material to prevent withdrawal of the legs from the mesh material.

6. The circular stapling device of claim 5 , wherein the proximal surface of each of the teeth is perpendicular to the longitudinal axis of the legs.

7. The circular stapling device of claim 1 , further including a cut ring, wherein the housing of the anvil head assembly defines an inner annular recess that is positioned within the outer annular recess and the cut ring is supported within the inner annular recess.

8. The circular stapling device of claim 1 , wherein the anvil head assembly is pivotally secured to the center rod.

9. The circular stapling device of claim 1 , further including a handle assembly and a body portion extending from the handle assembly, the body portion having a distal portion, the tool assembly being supported on the distal portion of the body portion.

10. An anvil assembly comprising:

a center rod having a proximal portion and a distal portion; and

an anvil head assembly including a central post, a housing, a cut ring, and a locking material, the central post being secured to the distal portion of the center rod, the housing defining an outer annular recess and an inner annular recess about the central post, the locking material positioned within the outer annular recess and the cut ring being positioned within the inner annular recess;

wherein the locking material includes a mesh material and the anvil head assembly includes a reinforcement material positioned over the locking material proximally of the mesh material.

11. The anvil assembly of claim 10 , wherein the housing includes a proximally facing surface that defines the outer annular recess, the reinforcement material is positioned on the proximally facing surface over the locking material.

12. A tool assembly comprising:

an anvil assembly and a staple cartridge, the anvil assembly being movable in relation to the staple cartridge between spaced and clamped positions, the anvil assembly including a housing defining a recess and a locking material positioned within the recess, the staple cartridge including a body defining a plurality of staple receiving slots, each of the staple receiving slots supporting a staple, the staple receiving slots being aligned with the recess when the anvil assembly and the staple cartridge are in the clamped position such that the staples are ejected and penetrate into the locking material when the tool assembly is fired, each of the plurality of staples including a backspan and a leg extending from each end of the backspan, at least one of the legs including locking structure that is configured to engage the locking material of the anvil assembly upon penetration of the locking material by at least one leg of the staples to obstruct withdrawal of the legs from the locking material;

wherein the locking material includes a mesh material and the anvil head assembly includes a reinforcement material positioned over the locking material proximally of the mesh material.

13. The tool assembly of claim 12 , wherein the housing includes a proximally facing surface that defines the outer annular recess and the reinforcement material is positioned on the proximally facing surface over the locking material.

14. The tool assembly of claim 12 , wherein the locking structure includes teeth positioned along at least a portion of the at least one leg of the plurality of staples.