PROBLEM TO BE SOLVED: To efficiently drive an ultrasonic transducer.SOLUTION: An ultrasonic treatment device comprises: an elastic body 4 a driving piezoelectric element 5 that is fixed to the elastic body 4 and excites the elastic body 4 so as to perform bending oscillation when being stretched by application of an alternating voltage and an oscillation detecting piezoelectric element 6 that is fixed to the elastic body 4. The oscillation detecting piezoelectric element 6 is placed at a position not crossing a node of bending oscillation of the elastic body 4.COPYRIGHT: (C)2014,JPO&INPIT【課題】超音波振動子を効率良く駆動する。【解決手段】弾性体4と、該弾性体4に固定され、交番電圧が印加されて伸縮することにより弾性体4に屈曲振動を励起する駆動用圧電素子5と、弾性体4に固定された振動検出用圧電素子6とを備え、振動検出用圧電素子6が、弾性体4の屈曲振動の節をまたがない位置に配置されている超音波処置装置を提供する。【選択図】図2
