PROBLEM TO BE SOLVED: To provide an endoscope treatment instrument in which, when an insertion part is inserted into a channel of an endoscope and used, force to draw back an operation shaft member is efficiently transmitted to a distal end side.SOLUTION: An endoscope treatment instrument 40 includes: a soft sheath 51 which can be inserted into a channel 11 of an endoscope 10 an operation shaft member 52 inserted into the sheath movably forward and backward a treatment part which is attached to a distal end part of the sheath and is connected to the operation shaft member and can compress the sheath in a direction of an axis C of the sheath when the operation shaft member is moved to a proximal end side and an operation part provided on the proximal end part of the sheath, for moving the operation shaft member forward and backward. The sheath includes: a distal end side suppression part 58 which is provided on the distal end side of the sheath and diametrically enlarges when the sheath is compressed in the axial direction, and thereby suppress movement of the sheath in the axial direction with respect to the channel and a proximal end side suppression part 63 which is provided on the proximal end side of the sheath and suppresses the movement of the sheath in the axial direction with respect to the channel at least when the sheath is compressed in the axial direction.COPYRIGHT: (C)2013,JPO&INPIT【課題】挿入部が内視鏡のチャンネルに挿通されて使用されたときに、操作軸部材を引き戻す力を先端側に効率的に伝達させる内視鏡処置具を提供する【解決手段】内視鏡処置具40は、内視鏡10のチャンネル11に挿通可能とされた軟性のシース51と、シースに進退可能に挿通された操作軸部材52と、シースの先端部に取り付けられるとともに操作軸部材に接続され、操作軸部材が基端側に移動したときにシースをシースの軸線C方向に圧縮可能な処置部と、シースの基端部に設けられ操作軸部材を進退させるための操作部とを備え、シースは、シースの先端側に設けられ、シースが軸線方向に圧縮されたときに拡径して、チャンネルに対してシースが軸線方向に移動するのを抑える先端側抑制部58と、シースの基端側に設けられ、少なくともシースが軸線方向に圧縮されたときにチャンネルに対してシースが軸線方向に移動するのを抑える基端側抑制部63とを有する。【選択図】図5
