A seal assembly is provided which includes a gimbal-like structure permitting rotation of a mounting member relative to the housing. The rotation of the mounting member allows the seal member to align with an instrument being inserted therethrough. The seal assembly is adapted to be detachably...http://www.google.com.au/patents/US5720759?utm_source=gb-gplus-sharePatent US5720759 - Seal assembly for accommodating introduction of surgical instruments
