Patent ID: 8079952

Claim:
An endoscope cleaning sheath, comprising: a tube body including an endoscope disposition hole into which is inserted and disposed an elongated insertion portion of an endoscope provided with at least an observation window at a distal end surface of the insertion portion, at least one liquid supply hole configuring a liquid supply channel that supplies a liquid such as water, and at least one gas supply hole configuring a gas supply channel that supplies a gas such as air; and a distal end configuration portion that is a cylindrical body provided in a fixed condition at a distal end portion of the tube body, in a state in which an inner surface of a distal end surface of the tube body and a distal end surface of the insertion portion of the endoscope contact against each other at a contact surface at which a part of the inner surface of the distal end surface of the tube body and a part of the distal end surface of the insertion portion of the endoscope contact against each other, that is the inner surface of a distal end portion including a notch portion that places in an exposure state the observation window provided on the distal end surface of the endoscope that is inserted and disposed in the endoscope disposition hole, the distal end configuration portion having a fluid mixing portion that causes a liquid that is supplied through the liquid supply hole and a gas that is supplied through the gas supply hole to merge to thereby mix a liquid and a gas, and a concave portion configuring an ejection opening that ejects a fluid mixture that is mixed at the fluid mixing portion towards the observation window of the endoscope, wherein the concave portion including a liquid supply groove configuring a fluid channel in which one end that is formed along an inner circumferential surface of the distal end configuration portion is closed, and that supplies a liquid that is supplied through a distal end side opening of the liquid supply hole that is disposed on the end side that is closed to the fluid mixing portion to which the other end leads and a gas supply groove configuring a fluid channel in which one end that is formed along an inner circumferential surface of the distal end configuration portion is closed, and that supplies a gas that is supplied through a distal end side opening of the gas supply hole that is disposed on the end side that is closed to the fluid mixing portion to which the other end leads.