An endovascular treatment aid is disclosed in which the filter does not catch on the treatment device during summary retrieval. The treatment aid connects a flexible shaft, a filter fixed to the shaft, which can be opened and closed like an umbrella, an end of the filter on the opening side, and a part of the shaft, and applies an external force to the base end. It is made of an elastomer having a linear support member that allows the filter to be closed by addition and a through hole (A), and the shaft passes through the through hole (A) on the proximal side of the opening of the filter. An elastomer member having an outer diameter of an end surface having a through hole (A) when the filter is closed and an outer diameter on the opening side of the filter when the filter is closed, and a through hole (B) And an outer tube that is proximal to the opening of the filter, the shaft passes through the through hole (B) and is movable in the longitudinal direction, and the elastomer member is the outer tube. Fixed to the tip side of To have.要約 回収時にフィルターが治療用デバイスに引っ掛からない血管内治療補助具が開示されている。治療補助具は、可撓性のシャフトと、シャフトに固定された、傘状に開閉可能なフィルターと、フィルターの開口部側の端部とシャフトの一部とを繋ぎ、基端側に外力を加えることでフィルターを閉じることを可能にする線状の支持部材と、貫通孔（Ａ）を有するエラストマーからなり、フィルターの開口部よりも基端側で、シャフトが貫通孔（Ａ）を貫通するように配置され、フィルターを閉じた時の貫通孔（Ａ）を有する端面の外径が、フィルターを閉じた時のフィルターの開口部側の外径よりも大きいエラストマー部材と、貫通孔（Ｂ）を有し、フィルターの開口部よりも基端側であり、シャフトが貫通孔（Ｂ）を貫通して、長手方向に可動な状態で配置された外チューブとを備え、エラストマー部材は、外チューブの先端側に固定されている。
