The ultrasonic vibration from the ultrasonic vibrator where the probe which forms the interposition section of the disposal tool which deals with the body tissue (10), as the basic surface which is stipulated in comparison with the longitudinal direction and the aforementioned longitudinal direction by with the brief crosswise (22a and 22b) the backing material which it possesses (12) with, it projects to a state where it possesses the width which is smaller than width of the crosswise of aforementioned basic surface vis-a-vis aforementioned basic surface paralleling to the longitudinal direction of aforementioned basic surface, extending it is put out, possesses with the Tip and the basic destal, with the aforementioned Tip and the basic destal distribution facilities is done the transmission possible guided wave path (14) with, it is provided in the Tip of the aforementioned guided wave path, the ended effector which deals with the body tissue with the ultrasonic vibration which transmitted the aforementioned guided wave path (16) with it possesses.生体組織を処置する処置具の挿入部を構成するプローブ(10)は、長手方向と前記長手方向に比べて短い幅方向とにより規定される基面(22a,22b)を有する基材(12)と、前記基面の幅方向の幅よりも小さい幅を有する状態に前記基面に対して突出するとともに前記基面の長手方向に沿って延出され、先端部と基端部とを有し、前記先端部と基端部との間に配設された超音波振動子からの超音波振動を伝達可能な導波路(14)と、前記導波路の先端部に設けられ、前記導波路を伝達した超音波振動により生体組織を処置するエンドエフェクタ(16)とを有する。
