Patent ID: 8439829

Claim:
An endoscope comprising: an insertion section which is inserted in a body cavity; a distal end section body which constitutes a distal end section of the insertion section and has at least an observation window at a distal end surface; a liquid feed path which communicates with a liquid feed source to supply liquid and has a plurality of opening ends open to the outer peripheral side of the distal end surface at intervals; a gas feed path which communicates with a gas feed source to supply gas and has a plurality of opening ends open on the distal end surface opposite to the opening ends of the liquid feed path across the observation window; and a nozzle which forms an M-shaped path formed of a first V-shaped path extending from an opening end of the liquid feed path along an outer peripheral portion and bending toward the center of the distal end section, a second V-shaped path extending from an opening end of the gas feed path along the outer peripheral portion and bending toward the center of the distal end section, and a confluent portion at which an extended end of the first path and an extended end of the second path are connected with each other at an obtuse angle more than 90° and the gas and the fluid from each of the opening ends collide and mix with each other to be a gas/liquid mixture fluid, the nozzle comprising a jet outlet to let the gas/liquid mixture fluid toward the observation window.