Bendable tube of endoscope

摘要

In a bendable tube of an endoscope, a plurality of joint rings each having a rotational axis perpendicular to a direction of bending of an insertion section of the endoscope are arranged in a longitudinal direction of the insertion section. A pair of connection tongue portions provided to project in a longitudinal direction of the joint rings are rotatably connected by means of a shaft member. An end face of a small-diameter portion of the shaft member, which comprises the small-diameter portion and a large-diameter portion, is welded to one of the tongue portions through a rotary shaft hole, which is formed in the other tongue portion and has a diameter slightly greater than a diameter of the small-diameter portion.