| 主权项 |
1. An endoscope treatment tool comprising:
a sheath; a support part which is attached to a distal end portion of the sheath; forceps members which are arranged in front of the sheath, are supported so as to be relatively rotatable around a rotation shaft provided at the support part, and have a pair of opposed surfaces; a linear member which is inserted through the sheath so as to be capable of advancing into and retracting from the sheath, brings the pair of opposed surfaces closer to each other at a position closer to a distal end side than the rotation shaft as the linear member is separated from the rotation shaft, and separates the pair of opposed surfaces from each other as the linear member approaches the rotation shaft; an elastic member which is supported by the linear member or the support part; and a locking portion which is provided on the linear member or the forceps members, wherein the locking portion is separated from the elastic member in a natural state when the linear member moves so as to be separated from the rotation shaft and the pair of the opposed surfaces abut against each other, wherein the locking portion moves to a contact position where the locking portion comes into contact with the elastic member in the natural state when the linear member moves so as to approach the rotation shaft and the pair of the opposed surfaces are separated from each other, and wherein as the locking portion is further moved such that the locking portion moved to the contact position approaches the rotation shaft, the elastic member is elastically deformed, and the pair of opposed surfaces are further separated from each other than when the locking portion is located at the contact position. |
