| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic operation appliance capable of preventing steam from intruding into an ultrasonic oscillator in autoclave sterilization, while securing electric insulation. SOLUTION: This ultrasonic operation appliance 1 is provided with an ultrasonic oscillator 6 generating ultrasonic oscillation and an oscillator cover 10 covering the ultrasonic oscillator 6 and forming a grip part 4. The oscillator cover 10 is provided with an innermost layer 10d positioned closest to the ultrasonic oscillator 6 provided in its inside, an outermost layer 10b positioned farthest from the ultrasonic oscillator 6 and forming the surface of the grip part 4, and an intermediate layer 10c positioned between the innermost layer 10d and the outermost layer 10b. In this appliance the innermost layer 10d and the outermost layer 10b are formed of an electrically insulating material and the intermediate layer 10c is formed of a material having different hygroscopicity from those of the innermost layer 10d and the outermost layer 10b. |
