Patent ID: 9248264
Filing Date: 2016-02-02
CPC Classification: A61M

Claim Text:
1. A dilator comprising a first section, a second section, a third section, and a fourth section which have different diameters from each other and are formed to be unitary with and adjacent to each other in an axial direction, wherein the first section is adjacent to and disposed on a distal side of the second section, the second section is adjacent to and disposed on a distal side of the third section, and the third section is adjacent to and disposed on a distal side of the fourth section, an angle α the angle α the angle α the outer peripheral surface of the first section has a tapered shape so as to expand in diameter by the angle α the outer peripheral surface of the second section has a tapered shape so as to expand in diameter by the angle α the outer peripheral surface of the third section has a tapered shape so as to expand in diameter by the angle α the outer peripheral surface of the fourth section has a tapered shape so as to expand in diameter by the angle α