PROBLEM TO BE SOLVED: To provide a treatment instrument enabling a smooth and rapid endoscopic treatment by correctly aligning a treatment function member with a desired direction by a simple operation for moving forward and backward a forward/backward movement member in an axial direction.SOLUTION: The treatment instrument for endoscope includes a rotation control means 55 for converting the forward/backward movement of the forward/backward moving member 17 inserted into a sheath 11 into the unidirectional rotation movement of the treatment function member 15. The rotation control means 55 has a first engaging member 57 formed on the inner circumferential side of the sheath, and a second engaging member 59 formed on the forward/backward movement side of the sheath. When the forward/backward moving member 17 moves in a first direction, the first and second engaging members relatively slide in the S1 direction and the circumferential direction of the sheath 11 to cause the forward/backward moving member 17 to generate a rotational force, thereby changing the rotation position of the treatment function member 15. When the forward/backward moving member 17 moves in a S2 direction, the first and second engaging members relatively slide in the S2 direction, thereby maintaining the changed rotation position of the treatment function member 15.COPYRIGHT: (C)2013,JPO&INPIT【課題】進退移動部材を軸線方向に進退移動させる簡単な操作により、処置機能部材を所望の向きに正確に合わせ、円滑かつ迅速な内視鏡処置を可能にする。【解決手段】内視鏡用処置具は、シース11内に挿通される進退移動部材17の進退動作を、処置機能部材15の一方向の回転動作に変換する回転制御手段55を備える。回転制御手段55は、シース内周側に設けた第1の係合部材57と、進退移動部材側に設けた第2の係合部材59を有する。進退移動部材17が第1の方向へ移動するとき、第1、第2の係合部材が相対的にS1方向及びシース11の周方向に摺動して進退移動部材17に回転力を発生させ、処置機能部材15の回転位置を変更する。進退移動部材17がS2方向に移動するとき、第1、第2の係合部材が相対的にS2方向に摺動して、処置機能部材15の変更された回転位置を維持する。【選択図】図3
