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A surgical stapling apparatus includes a staple cartridge and an anvil member. The staple cartridge includes a plurality of surgical fasteners disposed in rows of retention slots. The staple cartridge may have an annular or linear configuration of retention slots. The tissue contacting surface of th

A surgical stapling apparatus includes a staple cartridge and an anvil member. The staple cartridge includes a plurality of surgical fasteners disposed in rows of retention slots. The staple cartridge may have an annular or linear configuration of retention slots. The tissue contacting surface of the staple cartridge may be tapered or stepped. The anvil member has a tissue contacting surface that includes a number of pockets arranged for substantially aligning with the retention slots. In addition, the tissue contacting surface of the anvil member may complement the tissue contacting surface of the staple cartridge.

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1. An apparatus for joining tubular tissue sections comprising: an anvil assembly including a radially stepped first tissue contacting surface defining fastener forming recesses; anda cartridge assembly having a second tissue contacting surface complementary to the radially stepped first tissue cont

1. An apparatus for joining tubular tissue sections comprising: an anvil assembly including a radially stepped first tissue contacting surface defining fastener forming recesses; anda cartridge assembly having a second tissue contacting surface complementary to the radially stepped first tissue contacting surface, the second tissue contacting surface defining a plurality of retention slots, each of the plurality of retention slots configured to receive a surgical fastener therein; anda plurality of surgical fasteners, each of the plurality of surgical fasteners disposed in a respective one of the plurality of retention slots, wherein at least some of the plurality of surgical fasteners have different dimensions than others of the plurality of surgical fasteners. 2. The apparatus according to claim 1, wherein each of the first and second tissue contacting surfaces includes a first surface and a second surface positioned radially outward of the first surface. 3. The apparatus according to claim 2, wherein the first surface of the second tissue contacting surface is positioned distally of the second surface of the second tissue contacting surface. 4. The apparatus according to claim 3, wherein the first surface of the first tissue contacting surface is positioned distally of the second surface of the first tissue contacting surface. 5. The apparatus according to claim 2, wherein the first and second surfaces of the second tissue contacting surface are parallel to each other. 6. The apparatus according to claim 2, wherein the first and second surfaces of the first tissue contacting surface are parallel to each other. 7. The apparatus according to claim 2, wherein each of the first and second surfaces of the first tissue contacting surface defines an annular array of the fastener forming recesses. 8. The apparatus according to claim 7, wherein a first surgical fastener of the plurality of surgical fasteners has a first length and is formed against one of the fastener forming recesses defined in the first surface of the first tissue contacting surface, and a second surgical fastener of the plurality of surgical fasteners has a second length and is formed against one of the fastener forming recesses defined in the second surface of the first tissue contacting surface, the first and second lengths being different. 9. The apparatus according to claim 8, wherein the first length is smaller than the second length. 10. The apparatus according to claim 7, wherein the annular array of the fastener forming recesses on the respective first and second surfaces of the first tissue contacting surface is on a common plane. 11. The apparatus according to claim 2, wherein the second surface of the first tissue contacting surface is disposed radially outward of the first surface of the second tissue contacting surface. 12. The apparatus according to claim 2, wherein each of the first and second surfaces of the second tissue contacting surface defines an annular array of the retention slots on a common plane. 13. The apparatus according to claim 1, further including a handle assembly and a tubular body portion extending from the handle assembly, wherein the tubular body portion supports the cartridge assembly. 14. The apparatus according to claim 13, wherein the anvil assembly further includes an anvil shaft operatively coupling the anvil assembly with the handle assembly. 15. The apparatus according to claim 1, wherein the cartridge assembly further includes a staple ejection assembly having a plurality of pushers, each of the plurality of pushers disposed within a respective one of the plurality of retention slots. 16. The apparatus according to claim 1, wherein each of the first and second tissue contacting surfaces includes an outer surface, an intermediate surface, and an inner surface, the outer surface being radially outward of the intermediate surface, the inner surface being radially inward of the intermediate surface. 17. The apparatus according to claim 16, wherein the outer surface is positioned proximally of the intermediate surface. 18. The apparatus according to claim 17, wherein the intermediate surface is positioned proximally of the inner surface. 19. The apparatus according to claim 16, wherein each of the outer, intermediate, and inner surfaces of the first tissue contacting surface defines an annular array of the fastener forming recesses.