#$%^&*AU2019201330A120191017.pdf#####SURGICAL ANVIL ASSEMBLIES FOR SURGICAL STAPLING INSTRUMENTS ABSTRACT A surgical anvil assembly (26) for use with a circular stapling instrument (10), comprising: an anvil center rod (38)； an anvil head (40) pivotally coupled to the anvil center rod (38) and movable between a first, operative condition and a second, tilted condition, the anvil head (40) defining a recess therein and a groove extending radially outward from the recess； and a ring assembly (250) including: a backup member (27) disposed within the recess of the anvil head (40)； and a cut ring (78) nested with the backup member (27) and captured in the groove of the anvil head (40), wherein the ring assembly (250) is movable within the recess from a proximal position preventing pivotal movement of the anvil head (40) from the first, operative condition, to a distal position permitting pivotal movement of the anvil head (40)to the second, tilted condition.1/39 Q2
