PROBLEM TO BE SOLVED: To provide a catheter such as a balloon catheter having performance of high delivery and at the same time capable of speedily carrying out injection and suction operations of fluids such as expansion or contraction of a balloon.SOLUTION: The catheter includes a shaft with a lumen section communicated from a distal section to a proximal section and is characterized in that taper sections with diameters reduced from proximal sections toward the distal sections are formed in one section or all sections over the whole length of the shaft in an outer circumference section of the shaft and in an inner circumference section forming the lumen section respectively and an end section on the proximal section side of the tapered section formed on the inner circumference section is arranged in different position over the whole length of the shaft from an end section on the proximal section side of the tapered section formed on the outer circumference section.COPYRIGHT: (C)2013,JPO&INPIT【課題】高いデリバリ性能を持ち、且つ、バルーンの拡張・収縮などのように流体の注入、吸引操作を速やかに行うことができるバルーンカテーテルなどのカテーテルを提供すること。【解決手段】遠位部から近位部に亘り連通する内腔部を備えたシャフトを有し、該シャフトの外周部および前記内腔部を形成する内周部のシャフト全長の一部又は全部には、それぞれ近位部から遠位部に向かって減径するテーパー部が形成されてなり、前記内周部に形成された前記テーパー部の近位部側端部が、前記外周部に形成された前記テーパー部の近位部側端部とはシャフト全長において異なる位置に配されたことを特徴とするカテーテル。【選択図】図1
