A device for cleaning channels of an endoscope has its main body in which a first check valve for permitting merely suction of a liquid detergent into said main body, a syringe for effecting suction and discharge of the liquid detergent and a second check valve for permitting only discharge of the liquid...http://www.google.es/patents/US4667691?utm_source=gb-gplus-sharePatente US4667691 - Device for cleaning channels of an endoscope
