An endoscopic flow-passage confluent structure that connects a gas-feed tube and a liquid-feed tube provided in an endoscope to a confluent tube communicating with an ejection nozzle arranged at a tip of an insertion portion of the endoscope and for ejecting a cleaning fluid toward a viewing window of...http://www.google.fr/patents/US7833155?utm_source=gb-gplus-shareBrevet US7833155 - Endoscopic passage confluent structure
