EXPANSION CATHETER

PROBLEM TO BE SOLVED: To appropriately perform expansion of an intravascular indwelling device at a predetermined position without blocking a bloodstream.SOLUTION: An expansion catheter 2 for expanding a tubular intravascular indwelling device (e.g., a stent 1) indwelled at a predetermined position in a blood vessel V includes an expansion and contraction member 23 disposed inside the intravascular indwelling device that is expanded and deformed so as to press the intravascular indwelling device from the inside to the outside in a radial direction. The expansion and contraction member includes a plurality of main wires 233a,... for a skeleton, and the plurality of main wires for a skeleton can come in contact with the intravascular indwelling device separately from each other in a state that the expansion and contraction member is expanded and deformed.SELECTED DRAWING: Figure 3 【課題】血流を遮断することなく血管内留置具の拡張を所定位置で適正に行う。【解決手段】血管Ｖ内の所定位置に留置される管状の血管内留置具（例えば、ステント１）を拡張させる拡張用カテーテル２であって、血管内留置具の内側に配され、拡張変形して血管内留置具を内側から径方向外側に押圧する拡縮部材２３を備え、拡縮部材は、複数の骨格用主線材２３３ａ、...を有し、これら複数の骨格用主線材は、拡縮部材が拡張変形した状態にて、互いに離間して血管内留置具に接触可能である。【選択図】図３