Patent ID: 7727255

Claim:
A trocar adapted to provide access for a surgical instrument through a body wall and into a body cavity, comprising: a cannula having a proximal end and a distal end; a seal housing, includes an inner surface, communicating with the cannula to define a working channel; a seal assembly disposed within the seal housing; and a first conformable and a second conformable rollers included in the seal assembly, each having a substantially cylindrical outer surface, a pair of end surfaces and an axle supported by the seal housing; wherein the substantially cylindrical outer surface of the conformable rollers is dimensioned and configured for forming a zero seal in the absence of an instrument extending therethrough, and for contacting with and conforming to an instrument, thereby forming an instrument seal in the presence of the instrument extending therethrough, and wherein the substantially cylindrical surfaces and the end surfaces of the conformable rollers form lateral seals and end seals with the inner surface of housing.