BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an endoscope and an operation portion that bends a part of an insertion portion by pulling a wire.

2. Description of the Related Art

An endoscope having a form capable of bending a bending portion provided on an elongated insertion portion insertable into a living body, a machine, or the like is known. In International Publication No. WO2015/068468, for example, there is disclosed an endoscope capable of changing a bending direction of a bending portion and an angle of the bending by changing the pulling amount of a plurality of wires connected to the bending portion in accordance with a direction and an angle in which a joy stick lever provided on an operation portion is pushed down.

Further, in FIG. 28 of International Publication No. WO2015/068468, a technology using a pulley on which a wire is hooked in order to change a travelling direction of a wire inside the operation portion is disclosed.

SUMMARY OF THE INVENTION

An endoscope according to an aspect of the present invention includes: an insertion portion including a bending portion; a plurality of wires each having a distal end connected to the bending portion and inserted into the insertion portion; an operation portion fixed in a proximal end of the insertion portion, the plurality of wires extending in the operation portion from an inside of the insertion portion to an inside along a longitudinal axis of the insertion portion; a swinging mechanism provided on the operation portion and configured to swingably support an operation stick protruding from the operation portion, a pulling mechanism provided on the operation portion, proximal ends of the plurality of wires being connected to the pulling mechanism, the pulling mechanism being configured to change a pulling amount of each of the plurality of wires in accordance with an inclination angle and an inclination direction from a predetermined neutral position of the operation stick; one or more tubular members provided on the operation portion and including a first part extending in a direction of the longitudinal axis, a second part provided on a proximal end side of the first part and extending in a side direction to the longitudinal axis, and a bent part connecting the first part and the second part, any one of the plurality of wires being inserted into the one or more tubular members, the first part and the second part being fixed to the operation portion; and a stopper fixed in the operation portion and arranged so as to prevent movement of the bent part by abutting on an inside of bending of the bent part.

Further, an operation portion according to an aspect of the present invention includes at least one tubular member provided in an inside of the operation portion and including a first part in which the tubular member is fixed in the inside of the operation portion, a second part that extends in a direction different from the first part and is fixed, and a bent part in which the first part and the second part are bent and connected; and a stopper fixed in the inside of the operation portion and configured to prevent movement of the bent part by abutting on an inside of bending of the bent part.

