Patent ID: 8048011

Claim:
An ultrasonic treatment apparatus for medical procedures on an object being treated, comprising: a transducer unit that includes an ultrasonic transducer generating ultrasonic vibration and having an axial end outputting the ultrasonic vibration therefrom, a flange attached to the ultrasonic transducer so as to extend from the axial end of the ultrasonic transducer in a radial direction of the ultrasonic transducer, and an amplitude amplification element coupled with the axial end of the ultrasonic transducer to receive the ultrasonic vibration generated by the ultrasonic transducer and to amplify an amplitude of the ultrasonic vibration, the amplitude amplification element having an axial tip end from which the amplified ultrasonic vibration is outputted; a probe having both an axial base-side end connectable with the axial tip end of the amplitude amplification element and an axial tip end at which a treatment portion is provided so that the amplified ultrasonic vibration is transmitted to the treatment portion; an inner casing that has an inner wall surface to provide an inner space and an outer circumferential surface, the inner casing covers at least part of the amplitude amplification element and the flange, the ultrasonic transducer being accommodated in the inner space along an axial direction of the inner casing, the flange being fixed to the inner wall surface; and an outer casing that has an inner circumferential surface to provide an inner space in which the inner casing is accommodated, wherein the outer circumferential surface of the inner casing and the inner circumferential surface of the outer casing air-tightly come in contact with each other, and the inner and outer casings have a recess formed therebetween, the recess having a ring-shaped section extending perpendicularly to the axial direction and extending in the axial direction such that the recess provides a blocking layer being charged air-tightly with air and blocking transmission of heat and vibration from the inner casing to the outer casing, the blocking layer having a length that covers both the flange and at least part of the ultrasonic transducer in the axial direction.