PROBLEM TO BE SOLVED: To provide a catheter that prevents abrupt change in bending rigidity while reducing the diameter of a sheath, improves operability of the sheath and prevents the sheath from being bent during the operation.SOLUTION: The catheter 1 comprises: a long sheath body 21 with first lumens 27, 28 formed therein and an intermediate tube 29 arranged on a side of a tip in the direction of inserting the sheath body 21, and including a second lumen 26B. The sheath body 21 comprises: an outer tube 5 formed of polyether ether ketone (PEEK) an inner tube 7 which is formed of polyether ether ketone, is arranged inside the outer tube 5 and extends longer to the tip side than the outer tube 5 and a tip outer tube 6 which is arranged on the tip side of the outer tube 5 and outside the inner tube 7, and made of a material with rigidity lower than the polyether ether ketone.COPYRIGHT: (C)2012,JPO&INPIT【課題】シースの細径化を図りつつ曲げ剛性の急激な変化を抑制し、シースの操作性の向上および操作時の折れ曲がりの抑制が可能なカテーテルを提供する。【解決手段】第1のルーメン27,28が形成される長尺なシース本体部21と、前記シース本体部21の挿入方向先端部の側部に設けられて第2のルーメン26Bが形成される中間チューブ29と、を有するカテーテル1であって、前記シース本体部21は、ポリエーテルエーテルケトン(PEEK)からなる外管5と、前記外管5の内側に配置されて前記外管5よりも先端側まで延びるポリエーテルエーテルケトンからなる内管7と、前記外管5の先端側かつ前記内管7の外側に設けられ、ポリエーテルエーテルケトンよりも剛性の低い材料からなる先端外管6と、を有する。【選択図】図3
