A circular stapling device, comprising:a handle assembly；an elongate body that extends from the handle assembly；a cartridge assembly mounted on a distal end of the elongate body and being movable relative to the distal end of the elongate body between a first position and a second position, the cartridge assembly being positioned adjacent to the distal end of the elongate body in the first position and spaced from the distal end of the elongate body in the second position, the cartridge assembly including a tissue engaging surface that extends to an annular edge；a cartridge buttress member having a body portion and an extension portion that extends from the body portion of the cartridge buttress member, wherein when the cartridge assembly is disposed in the first position, the body portion is supported on the tissue engaging surface of the cartridge assembly and the extension portion extends over the annular edge so that the extension portion is secured between the elongate body and the cartridge assembly to maintain the buttress member supported on the cartridge assembly；an anvil assembly that is selectively movable relative to the cartridge assembly between an approximated position and an unapproximated position； andan anvil buttress member supported on a tissue engaging surface of the anvil assembly, wherein the anvil buttress member has a body portion and an extension portion that extends from the body portion thereof, the anvil assembly including a clamping assembly that secures the extension portion of the anvil buttress member to the anvil assembly so that the body portion of the anvil buttress member is supported over a tissue engaging surface of the anvil assembly, wherein the clamping assembly includes a clamp that is spring loaded to maintain the extension portion of the anvil buttress member secured to the anvil assembly.
