PROBLEM TO BE SOLVED: To provide a medical device and a treatment method capable of maintaining the position of an expansion part for collecting an object at an appropriate position in a living body lumen.SOLUTION: A medical device 1 inserted into a blood vessel for collecting thrombi 300 in the blood vessel includes: a long-sized shaft part 24 an expansion part 20 which is an elastically deformable cylindrical body having a plurality of clearances 21A, whose outer diameter at the central part is larger than the outer diameters at the two end parts of the cylindrical body in a natural state that external force is not applied, and whose proximal part and distal part of the cylindrical body are connected to the shaft part 24 and an elastically deformable auxiliary expansion part 80 connected to the distal part of the expansion part 20, which includes a wire material part 81 extending linearly toward a wire material end part 86 located on the distal side.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】物体を捕集する拡張部の位置を生体管腔内の適切な位置に維持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】血管内に挿入されて当該血管内の血栓300を捕集するための医療デバイス1であって、長尺なシャフト部24と、複数の間隙21Aを備えて弾性的に変形可能な筒体であり、外力の作用しない自然状態において筒体の両側の端部よりも中央部の外径が大きくなり、かつ筒体の近位部または遠位部がシャフト部24に連結されている拡張部20と、拡張部20の遠位部に連結され、遠位側に位置する線材端部86に向かって線状に延びる線材部81を備えて弾性的に変形可能である補助拡張部80と、を有する。【選択図】図3
