| 摘要 |
PROBLEM TO BE SOLVED: To perform treatment over a long time by allowing continuous drive over the long time of an ultrasonic transducer in which a width between a resonance frequency and an antiresonance frequency is narrow.SOLUTION: An ultrasonic treatment device 1 includes: a tip part 9 for treating a treatment target region by ultrasonic vibration; driving piezoelectric elements 10 for vibrating the tip part 9 by applying drive voltage varying at a drive frequency; a detecting piezoelectric element 12 disposed adjacently to the driving piezoelectric elements 10 through an insulating member 7, for converting the vibration generated by the driving piezoelectric elements 10 into a voltage signal; a frequency setting part 14 for setting the drive frequency of the drive voltage supplied to the driving piezoelectric elements 10; a phase difference calculation part 17 for calculating a phase difference between the drive voltage and the voltage signal detected by the detecting piezoelectric element 12; and a frequency control part 18 for controlling the frequency setting part 14 on the basis of the phase difference calculated by the phase difference calculation part 17. |
