Abstract: A surgical smoke evacuator for a surgical laser or cautery plume is disclosed. The evacuator includes collection tubing through which surgical smoke is drawn. The collection tubing has a distal end nozzle where the surgical smoke enters the evacuator. The evacuator also includes a variable vacuum motor coupled to the collection tubing for generating suction pressure at a distal end nozzle of the evacuator to draw smoke from a surgical site. A first filter is provided for removing particulates from smoke flowing through the evacuator. The first filter is in fluid communication with the distal end nozzle of the evacuator and the variable motor. A first sensor is attached to the first filter for detecting tissue invagination and a pressure relief device is associated with the evacuator for reducing the suction pressure within the evacuator when the first sensor senses tissue invagination.

Abstract: An incising trocar and cannula instrument for incising the walls of a body cavity to facilitate inserting the cannula through the wall into the cavity including a trigger operated incising blade and means for driving the blade through body tissue; and, a cannula having a sealing assembly for sealing the instrument during the incising procedure and thereafter when the trocar is removed.