A sealing assembly for sealing a cannula used in medical procedures is provided. The cannula is configured to allow passage therethrough of medical devices. The cannula is attached to a conduit piece formed to define at least one channel. A compressible annular seal is positioned in the at least one...http://www.google.fr/patents/US5167636?utm_source=gb-gplus-shareBrevet US5167636 - Cannula sealing mechanism
