Endoscopic treatment instrument

Abstract

An engaging mechanism, which restricts rotation of a cutter section about an axis of a sheath, is provided. In accordance with an advancing/retreating operation of an operation wire by an operation slider, switching is made between a rotation restriction position where rotational restriction of the cutter section is effected by the engaging mechanism and a restriction release position where the cutter section is released from the rotation restriction position and is made rotatable about the axis of the sheath relative to the sheath.

1 . An endoscopic treatment instrument comprising:
 a flexible sheath;   an operation member inserted in the sheath such that the operation member is axially slidable with respect to the sheath;   a treatment section provided at a distal end portion of the operation member and being slidable from/in the sheath;   a proximal-side operation section provided at a proximal end portion of the sheath, the operation section having a slider member, which slides the operation member in an axial direction of the sheath, and a rotation drive section which rotates the treatment section about the axis of the sheath; and   a direction adjusting section which adjusts a direction of the treatment section, the direction adjusting section having a rotation restriction section which restricts rotation of the treatment section about an axis thereof, and the direction adjusting section moving the treatment section between a rotation restriction position where rotational restriction is effected by the rotation restriction section, and a restriction release position where the treatment section is made rotatable about the axis of the sheath relative to the sheath, in accordance with an advancing/retreating operation of the operation member by the slider member;   wherein the rotation restriction section is provided within the operation section and the rotation restriction section includes a stopper member provided at a proximal end portion of the sheath and extending within the operation section, and an abutment portion provided on the slider member, the abutment portion detachably engaging the stopper portion to make the treatment section unrotatable.   
     
     
         2 . An endoscopic treatment instrument comprising:
 a flexible sheath;   an operation member inserted in the sheath such that the operation member is axially slidable with respect to the sheath;   a treatment section provided at a distal end portion of the operation member and being slidable from/in the sheath;   a proximal-side operation section provided at a proximal end portion of the sheath, the operation section having a slider member, which slides the operation member in an axial direction of the sheath, and a rotation drive section which rotates the treatment section about the axis of the sheath; and   a direction adjusting section which adjusts a direction of the treatment section, the direction adjusting section having a rotation restriction section which restricts rotation of the treatment section about an axis thereof, and the direction adjusting section moving the treatment section between a rotation restriction position where rotational restriction is effected by the rotation restriction section, and a restriction release position where the treatment section is made rotatable about the axis of the sheath relative to the sheath, in accordance with an advancing/retreating operation of the operation member by the slider member;   wherein the rotation restriction section is provided within the operation section and the rotation restriction section includes an engaging mechanism which restricts rotation of the treatment section by a frictional force between a stopper member provided at a proximal end portion of the sheath and extending within the operation section, and an abutment portion provided on the slider member.