PROBLEM TO BE SOLVED: To provide a dilator, when being inserted into a body wall, being little affected by a boundary between a diameter-enlarged part and a body part.SOLUTION: A dilator 100 includes: a diameter-enlarged part 10 that has an insertion hole 110 in which a puncture needle 31 is inserted, and a portion 11, the diameter of which is enlarged as it separates from an opening p at a tip end of the insertion hole 110 and a shaft body 50 to which the diameter-enlarged part 11 is fitted and that is long along an opening direction of the insertion hole 110. Then, a boundary part between the diameter-enlarged part 10 and the shaft part 50 has a boundary line that includes at least one line segment traversing a virtual plate 513, with an axial center X of the shaft body 50 defined as a normal line.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】体壁への押入時に拡径部と胴体部との境界の影響がより少ないダイレータを提供する。【解決手段】穿刺針31が挿入される挿入孔110を有し、挿入孔110の先端の開口部pから遠ざかるにしたがって径が大きくなる部位11を有する拡径部10と、拡径部11が取り付けられて、挿入孔110の開口方向に沿って長い軸体50と、を備えたダイレータ100を構成する。このとき、拡径部10と軸体50との境界部分は、軸体50の軸心Xを法線とする仮想平面513を横切る少なくとも1つの線分を含む境界線を有する。【選択図】図1
