Patent ID: 6955680

Claim:
A complex vibration ultrasonic hand piece, comprising an ultrasonic oscillation mechanism composed of a longitudinal vibration element, backing plates attached to both ends thereof and a front plate for generating an ultrasonic vibration of a predetermined frequency, a horn coupled with said ultrasonic oscillation mechanism for amplifying the vibration transmitted from said ultrasonic oscillation mechanism, a vibration conversion mechanism for converting the vibration transmitted from said ultrasonic oscillation mechanism into a composite vibration composed of a longitudinal vibration in the horn central axial direction and a torsional vibration having the horn central axis as a fulcrum, and a female portion provided with a working plane and disposed at said horn tip, wherein: said vibration conversion mechanism, between said horn tip and an electrostrictive element of said ultrasonic oscillation mechanism, is composed of one or more groove portions formed on the external surface of any of the horn, the ultrasonic oscillation mechanism or a member interposed between the horn and the ultrasonic oscillation mechanism.