Patent ID: 7942834

Claim:
An endoscope comprising: an inserted unit that is adapted to be inserted into a celomic cavity of a body and having therein at least one channel; a positioning unit that is provided near a distal end of the inserted unit; and an ultrasonic treatment apparatus that includes a transmitting member, a treatment unit, and a sheath, the transmitting member transmitting an ultrasonic wave produced by an ultrasonic vibrator, the treatment unit being provided on a distal end of the transmitting member, the sheath housing therein the transmitting member, wherein the ultrasonic treatment apparatus is movable forward or backward within the channel and is inserted into the channel to be arranged within the channel by engaging the positioning unit with the sheath so as to position a distal end of the treatment unit within a field of vision of the endoscope, and wherein the sheath has vibration isolating protrusions including at least one first protrusion extending from an inside surface of the sheath and abutting the transmitting member and at least one second protrusion extending from an outside surface of the sheath and abutting an inside surface of the channel, and said protrusions being provided at a position corresponding to a node of the ultrasonic wave.