Patent ID: 8372100

Claim:
An ultrasound surgical apparatus comprising: a handpiece equipped with an ultrasound transducer for generating ultrasound vibrations, and a probe provided with a proximal end portion coupled to the ultrasound transducer and a distal end portion to which the ultrasound vibrations are transmitted from the proximal end portion; a class information storage portion which is provided to the handpiece and stores identification information that indicates a class of the handpiece; a class information setting portion which, when connected to the handpiece, causes an electric signal to be transmitted from the class information storage portion to set the identification information; a drive portion which is connected to the ultrasound transducer and supplies the ultrasound transducer with a drive signal for generating the ultrasound vibrations; a detection portion which detects a signal level where only frequency components obtained by removing a resonance frequency of the drive signal are acquired, the signal level being a level of a cavitation level signal, the signal level corresponding to a state of cavitation generated when the distal end portion is vibrated with ultrasound in a calibration solution by a drive signal that causes vibration amplitude for calibration for causing the distal end portion of the probe to generate cavitation of a certain level corresponding to the identification information obtained via the class information setting portion; a correction relation calculation portion which, when the cavitation level signal as a predetermined drive signal is applied to the ultrasound transducer in one standard handpiece is regarded to have a standard value, calculates a correction relation of another handpiece with respect to the standard handpiece from a comparison relation of a cavitation level signal of the another handpiece with respect to the cavitation level signal having the standard value; a condition storage portion which, when a relation between a strength of the drive signal applied to the ultrasound transducer of the handpiece and an actual vibration strength at the distal end portion of the handpiece is regarded as calibration information, determines calibration information of the another handpiece with respect to calibration information of the standard handpiece based on the correction relation calculated by the correction relation calculation portion, and stores the calculated calibration information in advance before treatment is performed using the another handpiece; and a control portion which controls the drive signal to be supplied from the drive portion to the ultrasound transducer, based on the calibration information of the another handpiece stored in the condition storage portion, in order to cause the distal end portion to have a vibration strength suited for coagulation procedure or dissection procedure of a living tissue.