An endoscope having a control head, an objective head and a flexible shaft therebetween. The shaft has a flexible core with a conduit means therewith. A deflection means is provided with the shaft having a tension member and a distal end compression member for controllably returning the distal end to...http://www.google.fr/patents/US4748969?utm_source=gb-gplus-shareBrevet US4748969 - Multi-lumen core deflecting endoscope
