PROBLEM TO BE SOLVED: To provide a balloon for a catheter which never causes a positional deviation due to the slip relative to an inner wall of a blood vessel in expanding it at a constricted site, shows an excellent insertion property in inserting a balloon catheter having the balloon, and has high pressure resistance.SOLUTION: A balloon which is attached to a distal end part of a catheter shaft and constitutes a balloon catheter is configured by integrally molding a cylindrical central part 25, a hollow conical proximal end part 27 which is connected to a proximal end side of the cylindrical central part 25 and has a diameter reduced in a proximal end direction, an overhang part 24 which is connected to a distal end side of the cylindrical central part 25 and has a diameter that is enlarged (it overhangs to the outside in a direction of the diameter), and a hollow conical distal end part 23 which is connected to a distal end side of the overhang part 24 and has a diameter reduced in a distal end direction. When an outer diameter of the cylindrical central part 25 is (d), and a maximum outer diameter of the conical distal end part 23 is (D), (D-d) is 0.25 mm or greater.COPYRIGHT: (C)2015,JPO&INPIT【課題】狭窄部位で拡張する際に、血管内壁に対してスリップして位置ずれを起こすことがなく、これを備えたバルーンカテーテルを挿入する際の挿入性にも優れた高い耐圧性を有するカテーテル用バルーンを提供すること。【解決手段】カテーテルシャフトの先端部に装着されて、バルーンカテーテルを構成するバルーンであって、円筒状中央部25と、円筒状中央部25の基端側に連結されて基端方向に縮径する中空の円錐状基端部27と、円筒状中央部25の先端側に連結されて拡径する(径方向外側に張り出している)張出部24と、張出部24の先端側に連結されて先端方向に縮径する中空の円錐状先端部23とが一体的に成形されてなり、円筒状中央部25の外径を(d)、円錐状先端部23の最大外径を(D)とするとき、(D-d)が0.25mm以上である。【選択図】 図1
