A plug device for use in an entrance passage which is provided on a manipulating head of an endoscope to guide a treating instrument like forceps into an instrument channel of the endoscope. The plug device includes a metallic outer shell, and a pressure relief member formed of a resilient material and...http://www.google.fr/patents/US6117070?utm_source=gb-gplus-shareBrevet US6117070 - Plug device for endoscopic instrument channel
