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|1. (WO2018043544) DILATOR|
|Applicants:||SUMITOMO BAKELITE CO., LTD.
The objective of the present invention is to provide a dilator with which, when the dilator is pushed into a body wall, the impact of a boundary between an increasing-diameter portion and a trunk portion is reduced. To this end, the present invention provides a dilator (100) provided with: an increasing-diameter portion 10 including an insertion hole (110) into which a puncture needle (31) is inserted, and including an increasing-diameter part (11) the diameter of which increases with increasing distance from a tip end opening portion (p) of the insertion hole (110); and a shaft body (50) to which the increasing-diameter portion (10) is attached, and which is elongated in the longitudinal direction of the insertion hole (110); wherein the dilator (100) is characterized in that a boundary part between the increasing-diameter portion (10) and the shaft body (50) has a boundary line including at least one line segment which crosses a virtual plane (513) to which an axis (X) of the shaft body (50) is normal.