| 摘要 |
PROBLEM TO BE SOLVED: To generally facilitate delicate control of a cutting motion and especially, to efficiently and safely perform a precise and fine surgery in a narrow and deep recessed part in an ultrasonic hand piece used for cutting a rigid tissue such as a bone. SOLUTION: An ultrasonic hand piece is provided with an ultrasonic oscillation mechanism, an outer cylindrical part and a horn fitted on one end of the outer cylindrical part and the horn comprises a main body part and a surgical knife part formed at the apex of this main body and for cutting the rigid tissue such as the bone and the end part of the knife part is formed of an operating part consisting of at least one face part avoiding a stress concentration to an objective site of the rigid tissue such as the bone and preventing an excess puncturing from occurring thereon and transmitting an oscillation to form a fine ground layer and an edge part for scraping the bone tissue finely ground by means of this operating part and a longitudinally passing-through passage is provided on the horn main body part and one of the ends is connected with at least one opening part and the other end is connected with a suction mechanism and/or a water feeding mechanism.
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