PROBLEM TO BE SOLVED: To provide a dilator for an ultrasonic endoscope whose ultrasonic visibility has been improved.SOLUTION: In a dilator 3 for an ultrasonic endoscope consisting of a flexible tube having an expansion part having a tapered part 31b at the tip, and a straight trunk part 31d in the vicinity of a base end part of the tapered part, and a lumen into which a guide wire is slidably inserted, a rough surface 33a is provided to the whole or a part of the expansion part.SELECTED DRAWING: Figure 13COPYRIGHT: (C)2017,JPO&INPIT【課題】超音波視認性を向上した超音波内視鏡用ダイレータを提供する。【解決手段】先端部に先細のテーパ部31bおよび該テーパ部の基端部側近傍に直胴部31dを有する拡張部と、ガイドワイヤが摺動可能に挿通される内腔とを有する可撓性チューブからなる超音波内視鏡用ダイレータ3であって、前記拡張部の全部または一部に粗面33aを設けた。【選択図】図13
