| 摘要 |
PROBLEM TO BE SOLVED: To provide a dilator of which puncture resistance variation at inserting is small, puncture resistance value is low, and insertion property is sufficient. SOLUTION: In this dilator 1 equipped with a cylindrical body part 1b and a tapered tip part 1a, a taper shape of the tip part 1a is an outline R constituted by n continuous lines or curved lines and the outline R is formed to be positioned outside with respect to a straight line T connecting a tip of the tip part 1a, a first straight line from the tip, n-th straight line from an end of the curved line, or the end of the curved line. |
