PROBLEM TO BE SOLVED: To provide a medical device and a treatment method capable of immediately shutting down or reducing an intraluminal flow in a living body, thereby reducing the burden on a patient.SOLUTION: Provided is a medical device 1, comprising: a long shaft portion 40 insertable into a blood vessel an expandable balloon 50 disposed at a tip of the shaft portion 40 and a tube structure 10 which is formed generally in a tubular shape by wires with spacings 13 provided, and which is mounted to an outer peripheral surface of the balloon 50 in a contracted state before the balloon 50 expands and plastically deforms so as to increase its diameter with the expansion of the balloon 50. The tube structure 10 has a plurality of weakened portions 17 in a circumferential direction, wherein in each weakened portion, a plurality of weakened elements 16 less rigid than adjacent portions of the wires are arranged in parallel with the shaft center in one row. The tubular structure is deformable flat when bent sharply at the weakened portions 17.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】生体管腔内の流れを即時に遮断または低減させて患者への負担を低減できる医療デバイスおよび処置方法を提供する。【解決手段】血管内に挿入可能な長尺なシャフト部40と、シャフト部40の先端部に設けられて拡張可能なバルーン50と、線材によって間隙13を有しつつ全体として管状に形成され、バルーン50が拡張する前の収縮状態において当該バルーン50の外周面に装着され、バルーン50の拡張により塑性変形しつつ拡径する管構造体10と、を有する医療デバイス1であって、管構造体10は、線材において隣接する部位よりも剛性の低い脆弱要素16が軸心に平行に一列に複数並ぶ脆弱部17を周方向に複数有し、脆弱部17にて折れ曲がることで扁平に変形可能である。【選択図】図1
