Patent ID: 7918826

Claim:
A trocar assembly, comprising: a housing having a top portion, a bottom portion, and a cannula extending distally from the bottom portion, the housing and the cannula defining a working channel sized and configured to receive a surgical instrument; and a substantially spherically shaped seal unit disposed between the top and bottom portions of the housing and positioned distal to a proximal end of the top portion of the housing, the substantially spherically shaped seal unit being free to rotate within the housing when the top and bottom portions are locked together such that the top and bottom portions are fixed in relation to one another, the substantially spherically shaped seal unit having at least one seal element adapted to selectively seal the working channel, and the seal unit including a proximal portion with a proximal-facing convex outer surface, a distal portion with a distal-facing convex outer surface, and a bore extending through the proximal and distal portions and having the seal element extending thereacross; wherein the seal unit is adapted to rotate about at least one of a longitudinal axis of the assembly and an axis perpendicular thereto.