To obtain a flexible fixture capable of changing a fixing position of a bellows for flexibly fixing a surgical treatment instrument with flexibility in a wide range.SOLUTION: A column is provided with a shaft on which a spherical body is disposed at a tip end portion, a support column portion in which a support column is linearly connected to a rear end portion of the shaft portion, a column portion which is inclined in one direction around the spherical member It consists of a holding mechanism part that can be fixed. The restraining mechanism includes a pedestal which connects and fixes each of the mechanism elements constituting the retaining mechanism portion, two pins which are inserted and screwed in bolts pivotally attached to the lever in the direction of the rotational axis of the lever A drum for slidably holding the two pressing pieces having an inclined surface capable of pressing or relaxing an inclined surface of a restraining cam disposed between the pressing pieces A cap for slidably holding a restraining cam capable of pressing or relaxing a part of the surface of the spherical body with a pressing surface in a direction opposite to the inclined surface of the restraining cam, a cap rotatably holding Construct with holder to fix.BACKGROUND OF THE INVENTION【課題】手術用治療器具を屈曲自在に固定するための蛇腹の固定位置を広範囲に且つ柔軟性を持たせて変更ができる自在固定具を得る。【解決手段】先端部に球体を配設した軸と該軸の後端部に支柱を直線状に結合した支柱部と、前記球体を中心に一方向に傾倒及び全周方向に回動可能に固定ができる拘持機構部で構成する。該拘持機構部は当該拘持機構部を構成する各機構要素を連結固定する台座と、レバーの回転操作により当該レバーの回転軸方向に軸着したボルトに挿着及び螺着した2個の押圧コマの間に配設した拘持カムの傾斜面を押圧又は弛緩ができる傾斜面を有した前記2個の押圧コマを摺動可能に保持するドラムと、支柱部先端の球体を保持すると共に前記拘持カムの傾斜面と反対方向にある押圧面にて前記球体の表面の一部を押圧又は弛緩ができる拘持カムを摺動可能に保持するキャップと、該キャップを回動可能に保持固定するホルダーにて構成する。【選択図】図1
