< Topic >MRI and the combined use possible soft characteristic endoscope are offered.SolutionsSoft characteristic endoscope 20 flexible it should insert in the observation territory 11 of MRI device 10 has had insertion section 22. Insertion section 22 internal pipe of the resin make and this internal pipe 71 the triple spiral tube has had with the outer tube 73 of the resin make which covers 72 which covers 71 and this triple spiral tube 72. As for triple spiral tube 72, the 1st spiral band the 2nd spiral band to the 2nd spiral band 722 it includes with the 3rd spiral band 723 which is wound helically in opposite direction to outer circle of 722 where is wound helically in opposite direction to the outer circle of 721 which is wound around helical on the peripheral aspect of internal pipe 71 and this 1st spiral band 721 and this 2nd spiral band 722. The 1st - 3rd spiral band 721,722,723 low does with the phosphorus bronze or copper silver alloy which is the magnetic susceptibility material.< Selective figure >Figure 2【課題】MRIと併用可能な軟性内視鏡を提供する。【解決手段】軟性内視鏡20は、MRI装置10の観察領域11に挿入されるべきフレキシブルな挿入部22を有している。挿入部22は、樹脂製の内管71と、この内管71を覆う三重螺旋管72と、この三重螺旋管72を覆う樹脂製の外管73とを有している。三重螺旋管72は、内管71の外周面に螺旋状に巻き付けられた第1螺旋帯721と、この第1螺旋帯721の外周に逆方向に螺旋状に巻かれた第2螺旋帯722と、この第2螺旋帯722の外周に第2螺旋帯722とは逆方向に螺旋状に巻かれた第3螺旋帯723とを含む。第1~第3螺旋帯721,722,723は、低磁化率材料であるリン青銅又は銅銀合金で出来ている。【選択図】図2
