Pivoting anvil assembly for surgical stapling device

An anvil assembly comprising:

• an anvil head having a post, an anvil including a plurality of staple forming pockets and a cutting ring slidably positioned about the post from a first position to a second position along a path of travel;
• an anvil center rod extending from the post of the anvil head;
• and
• a retainer clip positioned on the post of the anvil head, the retainer clip having at least one resilient arm which is movable from a biased condition to an unbiased condition, wherein in the unbiased condition the at least one resilient arm extends outwardly of the post;
• wherein in the first position, the cutting ring is at least partially engaged with the at least one resilient arm to urge the at least one resilient arm out of the path of travel of the cutting ring and in the second position, the at least one resilient arm of the retainer projects into the path of travel of the cutting ring to prevent movement of the cutting ring from the second position back to the first position.