An object of the present invention is to provide a medical device that can be properly secured in the infeed is easy target site. [SOLUTION] The occlusion device 50 comprises an occlusive material having a central axis A extending between a proximal end and a distal end 58 and the end portion, overlapping occlusive material and at least three inverted are folded together and a pre-set overlapping configuration including layers, overlapping layers 52, 54, 55 with at least three inverted, is aligned with the central axis in the range of about 45 degrees, it is separated in a configuration that is non-overlapping with the catheter It is arranged Te, when placed out from the catheter and is configured to return to the pre-set overlapping configuration. .BACKGROUND【課題】送り込みが容易であり標的部位に適切に固定できる医療デバイスを提供する。【解決手段】この閉塞デバイス50は、近位端部及び遠位端部58と端部間に延びる中心軸線Aとを有する閉塞材料を含み、閉塞材料が、互いに折り重なった少なくとも3つの反転した重なり合う層を含む予備設定された重なり合う構成を有し、少なくとも3つの反転した重なり合う層52、54、55が、約45度以下の範囲で中心軸線と整合され、カテーテル内で重なり合わない構成で分離して配置され、カテーテルから出て配置されると予備設定された重なり合う構成に戻るように構成されている。【選択図】図1