Patent ID: 8491533

Claim:
A trocar sleeve assembly comprising: a cannula; a housing assembly connected to said cannula to define a working channel extending axially therethrough, wherein said housing assembly comprises a housing that defines at least one opening in fluid communication with said working channel, a sleeve slidably received over said housing to define an annular region between said sleeve and said housing, a first sealing member forming a first seal between said sleeve and said housing, and a second sealing member forming a second seal between said sleeve and said housing, said second sealing member being axially spaced from said first sealing member to define a pressure chamber in said annular region; and an insufflation port in fluid communication with said pressure chamber, wherein said sleeve is slidable relative to said housing between at least a first position, wherein said pressure chamber is in fluid communication with said opening, and a second position, wherein said pressure chamber is fluidly decoupled from said opening, and said opening is fluidly coupled to an open-air atmosphere external to said trocar sleeve assembly.