Patent attributes
A surgical stapling instrument includes an anvil assembly, a shell assembly, and an adapter assembly. The adapter assembly includes a tubular shaft supporting the shell assembly at a distal portion of the tubular shaft, and a trocar assembly transitionable between an extended configuration and a retracted configuration. The trocar assembly includes a trocar detachably supporting the anvil assembly thereon, a lead screw adapted to be coupled to an actuator for rotational input, a first member rotatably supporting the lead screw, a second member operatively coupled to the lead screw such that rotation of the lead screw causes axial displacement of the second member relative to the first member, and a light diffuser configured to scatter light received from a light source. The light diffuser is configured to be surrounded by the anvil center rod when the anvil center rod is attached to the trocar.