An ultrasonic surgical tool system 3 having a tip that can vibrate simultaneously in a plurality of modes. The system includes a console 24 that can supply a drive signal including a plurality of components to the tip. Each component has a frequency characteristic based in part on the equivalent current flowing through the mechanical element at the tip. Each frequency component is different from each other. Based on the application of the drive signal, the tip is subjected to nonlinear vibration. [Selection] Figure 11複数のモードにおいて同時に振動することができる先端部を備えた超音波式手術用ツールシステム３。本システムは、複数の成分を含む駆動信号を先端部に供給することができるコンソール２４を有する。各成分は、先端部の機械的要素を流れる等価電流に部分的に基づく周波数特性を有する。各周波数成分は互いに異なる。駆動信号の印加に基づいて、先端部は非線形振動を受ける。【選択図】図１１
