A circular stapling apparatus (10) comprising: an anvil assembly (20) with an anvil member (21) and a rod (23), the anvil member having a circular formation of staple formation recesses； a portion (14) of tubular body having a staple cartridge (32), the stem of the anvil assembly (20) being connectable to the portion (14) of tubular body so that the anvil assembly is movable to and from the tubular body portion, the staple cartridge (32) comprising a plurality of staple grooves (52) aligned with the staple recesses, the grooves being defined on a contact surface (51) with tissue of the cartridge ； a plurality of staples and a pusher (64) having a plurality of fingers (65) that have a shape corresponding to the shape of the staple receiving grooves (52) and that are aligned with the staple receiving grooves (52) for the operation of the staples outside the cartridge towards the staple recesses of the member of the anvil member； and a buttress material (74) detachably attached to the staple cartridge (32) by at least one anchor (72)； characterized in that at least one of the staple receiving channels (52) on the contact surface with tissue of the staple cartridge (32) has a notch (56) formed to retain the anchor (72), the notch for clamping being configured the anchor, and at least one of the plurality of fingers (65) includes a projection (67) disposed in the notch (56), whereby the advance of the fingers (65) of the pusher (64) advances the projection ( 67) towards its coupling with the anchor (72) in the notch (56) to push the anchor out of the notch.Un aparato de grapado circular (10) que comprende: un conjunto (20) de yunque con un miembro (21) de yunque y un vástago (23), teniendo el miembro de yunque una formación circular de rebajos de formación de grapas； una porción (14) de cuerpo tubular que tiene un cartucho (32) de grapas, siendo conectable el vástago del conjunto (20) de yunque a la porción (14) de cuerpo tubular de modo que el conjunto de yunque sea móv
