Patent ID: 8273087
Filing Date: 2012-09-25
Classification: A61B

Abstract:
1. An ultrasonic surgical instrument for cutting or shaving hard tissues, comprising: an ultrasonic transducer for producing ultrasonic vibration; a case for storing the ultrasonic transducer; a transmission member which has a distal end portion and a proximal end portion, connects the ultrasonic transducer in the proximal end portion, and transmits the ultrasonic vibration produced by the ultrasonic transducer from the proximal end portion to the distal portion; and a sheath which covers the transmission member and connects the case movably along a peripheral direction of the transmission member, wherein the transmission member has a treatment portion in the distal end portion, the treatment portion has at least a first treatment portion and a second treatment portion provided in positions different from each other in the peripheral direction of the transmission member, the sheath is provided in a position corresponding to the treatment position, and has an open part in which one of the first treatment portion and the second treatment portion is exposed, and when the sheath is rotationally moved along the peripheral direction of the transmission member to the transmission member, the treatment portion is switched to one of a first state in which the first treatment portion is exposed via the open part and the second treatment portion is covered by the sheath when the first treatment portion cuts or shaves hard tissues, and a second state in which the second treatment portion is exposed via the open part and the first treatment portion is covered by the sheath when the second treatment portion cuts or shaves hard tissues.