Patent ID: 8590763

Claim:
A surgical stapling device comprising: a handle assembly; an elongated body portion extending distally from the handle assembly and defining a longitudinal axis; a shell assembly supported on a distal end portion of the elongated body portion and including a staple guide, the staple guide defining a plurality of staple receiving pockets that support a plurality of staples; an anvil assembly including an anvil head that defines a tissue engagement surface having a plurality of staple forming pockets, the tissue engagement surface defining a plane and being movable relative to the longitudinal axis between a first position and a second position, the plane being perpendicular with the longitudinal axis in one of the first and second positions and defining an acute angle with the longitudinal axis in the other of the first and second positions; an anvil retainer assembly supported within the shell assembly and being adapted to releasably engage the anvil assembly to movably support the anvil assembly in relation to the shell assembly such that the tissue engagement surface of the anvil head moves between the first and second positions when the anvil retainer assembly is secured to the anvil assembly, the anvil retainer assembly including a body portion and a trocar that is axially movable through the body portion between proximal and distal positions to facilitate movement of the anvil head between the first and second positions; and a biasing member for urging the trocar towards the proximal position.