Patent ID: 8702595

Claim:
An insertion instrument, comprising: an elongated insertion portion that is inserted inside a subject; a bending portion that is provided in the insertion portion and that is capable of bending accompanying pulling/relaxing of a wire that is inserted through an inside of the insertion portion; a flexible tube portion that is connected in series to a proximal end side of the bending portion in the insertion portion in an insertion direction of the insertion portion; an inside guide pipe that is flexible and that is provided inside the insertion portion, and through an inside of which the wire is inserted to freely advance and retract in the insertion direction; and an outside guide pipe that is flexible and that is provided inside the insertion portion, and through an inside of which the inside guide pipe is inserted to freely advance and retract in the insertion direction; wherein: inside the insertion portion, a distal end in the insertion direction of the inside guide pipe is fixed to a midway position in the insertion direction of the bending portion, and a proximal end in the insertion direction of the inside guide pipe is configured such that advancing and retracting in the insertion direction of the inside guide pipe are switchable between a fixed state and a non-fixed state by a fixing switching member; and inside the insertion portion, a distal end in the insertion direction of the outside guide pipe is fixed to a distal end of the flexible tube portion, and a proximal end in the insertion direction is fixed at a more rearward position in the insertion direction than the flexible tube portion.