Incision tool

1. An incision tool comprising:

a sheath;

a plurality of wires that are inserted through an internal space of the sheath, and that, as a result of a portion thereof being inserted through both first wire insertion through holes that are provided in a distal end portion of the sheath and second wire insertion through holes that are provided on a sheath distal end side of the first wire insertion through holes, are exposed on an outside of the sheath between the first wire insertion through holes and the second wire insertion through holes, and that receive high-frequency current;

an operating unit that is connected to a base end side of the wires and that adjusts a length of the exposed portions of the wires which are exposed on the outside of the sheath by moving forwards or backwards relatively to the sheath in a longitudinal direction of the wires; and

wire restricting portions that are formed in a position corresponding to the first wire insertion through holes and the second wire insertion through holes, wherein

the wire restricting portions comprise a circular plate portion that is formed in a direction which is perpendicular to an axial direction of the sheath, and comprises protruding portions that extend from one side of the circular plate portion in a direction which is perpendicular to the circular plate portion;

the protruding portions comprise wire guide grooves that extend to the axial direction of the sheath;

the plurality of wires each have a base end side insertion portion that is inserted into the internal space of the sheath on the base end side of the first wire insertion through hole, an exposed portion that extends from the base end side insertion portion towards the distal end side and passes through the first wire insertion through hole so as to be exposed on the outside of the sheath by being guided by the wire guide grooves, a distal end side insertion portion that extends from the exposed portion towards the distal end side and passes through the second wire insertion through hole so as to enter again into the internal space of the sheath by being guided by the wire guide grooves, and a bent portion that is provided in an end portion on the exposed portion side of the distal end side insertion portion and that bends the wire in the axial direction of the sheath from the direction in which it enters into the internal space of the sheath via the second wire insertion through hole, and wherein

the plurality of wires are bound together into a single bundle in the distal end side insertion portion on the distal end side of the bent portions by a binding component.

2. The incision tool according to claim 1 , wherein an anchor portion whose diameter is larger than a diameter of the sheath is provided in the sheath on the distal end side of the exposed portions of the wires.

3. The incision tool according to claim 1 , wherein the exposed portions of the plurality of wires that are exposed to the outside of the sheath between the first wire insertion through hole and the second wire insertion through hole are arranged in a radial pattern around a center axis of the sheath.

4. The incision tool according to claim 1 , wherein a gradation scale that forms an index for adjustment of the length of the exposed portions of the wires is formed on the operating unit.