A protective sheath assembly for use with a medical instrument is disclosed. The assembly comprises an elongatable hollow sheath attached to a transparent distal end plate. A tube extends from the end plate and is surrounded by the sheath. In order to provide for suctioning or irrigation of bodily cavities,...http://www.google.de/patents/US4741326?utm_source=gb-gplus-sharePatent US4741326 - Endoscope disposable sheath
