| 摘要 |
PROBLEM TO BE SOLVED: To provide an endoscope insertion portion which shows high safety, achieves the reduction in a diameter and a cost and easy operability, and has rigidity in a lengthwise direction that can be freely varied, and a method for manufacturing the same.SOLUTION: A helical gap is formed by performing laser processing helically on an outer periphery of a high-strength alloy pipe material. Rigidity in a lengthwise direction of a bending portion 6 is freely varied by combining variations in a pitch of a helix, a helical angle, and a gap width and subsequently performing heat treatment. A wire guide for operating the bending portion is easily provided on an inner periphery of the bending portion, and an endoscope insertion portion 4 which is easy, safe, and inexpensive, exhibits suitable flexibility, and has excellent operability can be manufactured. |
