Patent ID: 8236018

Claim:
An ultrasonic surgical instrument comprising: an ultrasonic transducer producing ultrasonic vibration; a transmission member connected to the ultrasonic transducer at a proximal end, and configured to transmit ultrasonic vibration produced by the ultrasonic transducer from the proximal end to a distal end of the transmission member; a sheath in which the transmission member is inserted; a procedural unit provided to the distal end of the transmission member so that it projects from a distal end of the sheath, and is configured for treating a surgical target portion using ultrasonic vibration transmitted from the transmission member; a procedural unit main body provided in the procedural unit, and configured for treating the surgical target portion; a procedural member provided in the sheath so that it projects from the distal end of the sheath to treat the surgical target portion; and a procedural member main body provided at a distal end of the procedural member to treat the surgical target portion, the procedural member main body overlapping with the procedural unit main body, and thereby, the procedural member main body and the procedural unit main body being configured for treating the surgical target portion, wherein the procedural unit has a large-diameter loop shape in a longitudinal direction of the transmission member, the loop shape being formed with an opening which is configured to penetrate the procedural unit in a thickness direction thereof and in which the surgical target portion is placed.