Treatment tool for endoscope and medical procedure

1. A treatment tool for an endoscope comprising:

an outer sheath to be inserted into a channel of an endoscope;

a forcep sheath which is movably arranged in the outer sheath along an axial direction;

a plurality of forcep cups which are attached to a distal end of the forcep sheath, at least one of which is formed with a sharp needle-shaped portion on a distal end, and which cooperate with each other to be openable/closable as a whole;

an operation wire which is movably arranged in the forcep sheath along an axial direction, and is connected to the forcep cups, and which opens/closes the forcep cups when moved in its axial direction;

a first operation portion which is movably attached along an axial direction of a proximal end of the outer sheath, and is connected to a proximal end of the forcep sheath; and

a second operation portion which is movably attached to the first operation portion along an axial direction of the proximal end of the forcep sheath, is connected to a proximal end of the operation wire, and is configured to receive a pressing operation by an operator, wherein

the second operation portion is provided with an elastic member which returns the second operation portion to an original position when the pressing operation by the operator is released,

the treatment tool further comprises an elastic member stopper, wherein the elastic member is sandwiched between the second operation portion and the elastic member stopper, and

the elastic member stopper is positioned by a positioning mechanism in a plurality of axially spaced positions including a free position where the elastic member is not contacted by the second operation portion.

2. The treatment tool for an endoscope according to claim 1 , further comprising an endoscope coupling tool which is connected to the proximal end of the outer sheath and is fixed to an insertion port of the channel of the endoscope.

3. The treatment tool for an endoscope according to claim 2 , wherein the first operation portion includes a pipe-shaped handle that is to be grasped by an operator's hand.

4. The treatment tool for an endoscope according to claim 3 , wherein the second operation portion includes a button which is provided on a proximal end of the pipe-shaped handle constituting the first operation portion, and is pressed by a finger of the operator's hand grasping the pipe-shaped handle.

5. The treatment tool for an endoscope according to claim 2 , further comprising a first operation portion stopper which determines a movement limit position when the first operation portion is moved to the endoscope coupling tool side.

6. The treatment tool for an endoscope according to claim 2 , wherein the endoscope coupling tool includes a sheath fixed position adjustment mechanism which, when fixed to the insertion port of the channel of the endoscope, moves and adjusts a fixed position of the proximal end of the outer sheath along the axial direction of the proximal end of the outer sheath.

7. The treatment tool for an endoscope according to claim 2 , wherein the endoscope coupling tool comprises a lock member configured to fix the treatment tool to the endoscope by a sliding operation of the lock member.

8. The treatment tool for an endoscope according to claim 1 , wherein only one forcep cup among a plurality of the forcep cups is formed with the sharp needle-shaped portion.

9. The treatment tool for an endoscope according to claim 8 , wherein only a forcep cup not formed with the sharp needle-shaped portion among a plurality of the forcep cups is openable/closable.

10. The treatment tool for an endoscope according to claim 1 , wherein all forcep cups among a plurality of the forcep cups are formed with the sharp needle-shaped portions.