PROBLEM TO BE SOLVED: To provide a catheter which prevents a coil for embolus from protruding from a vascular aneurysm or an agent for embolus from leaking from the vascular aneurysm or an instrument for medical treatment inserted in the vascular aneurysm from coming off therefrom to treat the vascular aneurysm certainly and safely.SOLUTION: The catheter 1 includes: a catheter body 2 including a first lumen 3 through which an expanding fluid is supplied and discharged and a second lumen 4 into which an elongated instrument for medical treatment is inserted a balloon 6 provided at a distal end portion of the catheter body and communicating with the first lumen to allow the balloon to be expanded or contracted in line with the supply and discharge of the expanding fluid thereto and therefrom and a communication section 23 providing access to an outer face of the balloon, and communicating with the second lumen while being isolated from the inside of the balloon.COPYRIGHT: (C)2013,JPO&INPIT【課題】血管瘤からの塞栓コイルのはみ出し若しくは塞栓用薬剤の漏れ、又は血管瘤へ挿入した医療器具の抜けを防止して血管瘤の治療を確実且つ安全に行なうことができるカテーテルを提供する。【解決手段】カテーテル1は、拡張流体を給排する第1のルーメン3及び長尺状の医療器具を挿通する第2のルーメン4を備えたカテーテル本体2と、カテーテル本体の先端部に設けられて第1のルーメンに連通し、拡張流体の給排によって拡縮するバルーン6と、バルーンの外面に開口され、バルーンの内部と隔離された状態で第2のルーメンに連通する連通部23と、を有する。【選択図】図2
