| 主权项 |
1. An endoscopic treatment tool, comprising:
a treatment part which is adapted to conduct treatment of tissue within a body cavity; an operation part which is adapted to operate the treatment part, the operation part includes a main body in which a sliding space elongated in a longitudinal direction inside the main body is formed and a slider slidingly coupled to the main body and configured to be capable of relatively sliding with respect to the main body; an operation shaft member which connects the treatment part and the slider, the operation shaft member which is capable of moving relative to the main body in an axial direction of the operation shaft member; and a coil sheath part through which the operation shaft member passes so that the operation shaft member is capable of forward or backward movement, wherein the coil sheath part further comprises:
a first coil sheath around which a wire is helically wound; anda second coil sheath that has a lower compressive resistance than the first coil sheath and has a higher rotation follow-up capability than the first coil sheath,the first coil sheath and the second coil sheath are disposed so as to coaxially and radially overlap,a first end part of the second coil sheath is connected to the treatment part so as to be incapable of rotating around an axis of the second coil sheath relative to the treatment part, a second end part of the second coil sheath is connected to a sliding member which is configured to freely slide inside the sliding space along the axis of the second coil sheath,
the second end part of the second coil sheath and the sliding member are inserted into the sliding space and freely slide inside the sliding space in an axial direction of the first coil sheath, the second end part of the second coil sheath and the sliding member are configured to be incapable of rotating around the axis of the second coil sheath relative to the main body,a first end part and a second end part of the first coil sheath are respectively connected to the treatment part and the main body so as to be incapable of moving relative to the treatment part and the main body in the axial direction of the first coil sheath,the operation part, the second coil sheath and the treatment part relatively rotate with respect to the first coil sheath, and the sliding member slides inside the sliding space in the axial direction of the second coil sheath in accordance with a difference in length between the first coil sheath and the second coil sheath occurring during bending of the coil sheath part. |
