A circular stapling device includes a circular anvil assembly and a circularcartridge assembly. The anvil assembly includes a cap and head. The cap ismovablerelative to the head. The head supports a crush ring member that is movableintoengagement with the cap to move the cap to an unapproximated position relativeto thehead to release a portion of an anvil buttress member supported between theanvil capand the anvil head. The cartridge assembly includes a housing, a pushermember, aretaining ring member, and a fastener cartridge. The retaining ring memberreleasablysecures a portion of a cartridge buttress member to one or both of the housingand thefastener cartridge. The retaining ring member releases the cartridge buttressmemberwhen the retaining ring member moves from a radially constricted condition toa radiallyexpanded condition in response to a movement of the pusher member.
