Nowadays, the development of medical equipment industry is becoming more and more diverse. And the stainless steel pipes are widely used in the medical equipment. There is a hollow shaft body in medical equipment. At the end of the hollow shaft body, a cylindrical tip portion is formed on and a manipulative grip is connected to a proximal side portion of the hollow shaft. They provide a screw-like concave-convex streak of projection. This makes it possible to cross the tip portion through the diseased area which resists a dilatation device to cross through.