Patent ID: 6093176
Filing Date: 2000-07-25
Classification: A61B

Abstract:
A trocar assembly which provides a conduit for gas and an instrument through the body wall of a patient and into an internal cavity, the trocar assembly having a distal end and a proximal end, comprising:(A) a cannula comprising a tube and a mating member;(B) a passive valve seal assembly comprising a cannula mating portion, an instrument seal assembly mating portion and a valve seal which is closed in the passive state to prevent passage of gas through said passive valve seal assembly and which opens to allow insertion of an instrument therethrough;(C) an instrument assembly comprising a valve seal assembly mating portion and an instrument seal which prevents passage of gas through said instrument seal assembly in combination with an instrument inserted therethrough, said instrument seal assembly connected to said passive valve seal assembly;where said cannula is releasably connected to said cannula mating portion of said combined passive valve seal assembly and instrument seal assembly to define a common axial bore extending from said distal end to said proximal end of said trocar assembly and said passive valve seal assembly is disposed intermediate said cannula and said instrument seal assembly;where said mating portion of said cannula comprises cannula detent flanges and where said cannula mating portion of said passive valve seal assembly comprises pathway ribs defining an axial pathway for said cannula detent flanges which allows relative axial movement between said cannula and said passive valve seal assembly; and where said passive valve seal assembly further comprises axial detent flanges which abut said cannula detent flanges upon relative rotation of said cannula and said passive valve seal assembly, said axial detent flanges in combination with said cannula detent flanges preventing axial separation of said cannula and said passive valve seal assembly.