Neck Fufushiwa structure and endoscopic

摘要

PROBLEM TO BE SOLVED: To effectively prevent the generation of twist and to surely and stably operate swinging. SOLUTION: In this structure body, the plural pieces of swing node rings 1 composed of a basic circular ring part 4 provided with a pair of peak parts 3 whose vertex parts are at symmetrical positions relating to an axial center and an expansion part for inserting a swing wire projected to the inner diameter side of the basic circular ring part 4 are disposed along an axial center direction. The peak parts 3 of the swing node rings 1 are connected by laser welding linearly or intermittently over the entire length of the structure body.