An apparatus for joining two hollow organ sections with an annular array of surgical staples, the apparatus comprising: a staple cartridge component including a plurality of surgical staples in an annular array； an anvil component including an anvil member defining a plurality of staple pockets for forming the surgical staples and a shaft extending distally from the anvil member, the anvil component movable relative to the staple cartridge component between spaced apart and approximated positions to adjustably clamp the organ sections between the staple cartridge and anvil components； a knife member concentrically arranged in the staple cartridge component, the knife member movable relative to the staple cartridge component； and a first buttress (900) component including a buttress member concentrically aligned with the anvil component and a rim (92) extending distally from the buttress member, the first buttress component enclosing the plurality of staple pockets defined in the anvil member. The apparatus may further include a second buttress component (110) concentrically aligned with the staple cartridge component.
