Balloon expandable interventional valve stent having inwardly-narrowed wing-spreading skirt

A balloon-expandable interventional valve stent, comprising a stent main body, a valve leaflet, and a wing-spreading skirt, wherein:

• the stent main body comprises an inflow channel positioned at a lower portion and an outflow channel positioned at an upper portion, the wing-spreading skirt is arranged on an outer side of the outflow channel, a portion of the wing-spreading skirt proximate to a middle portion of the stent main body is fixedly connected to the stent, and a surface of the wing-spreading skirt is attached to the surface of the stent main body;
• an inflow channel side of the stent main body is further provided with a skirt;
• a pulling suture connecting the wing-spreading skirt and the skirt on the inflow channel side and extending between the wing-spreading skirt and the skirt on the inflow channel side in a reciprocating manner for multiple times;
• when a balloon is expanded and spread within the balloon-expandable interventional valve stent, two ends of the stent main body are firstly spread, and the middle portion of the stent main body is subsequently spread;
• when the stent main body on the inflow channel side is spread, the skirt on the inflow channel side unfolds, and the pulling suture connected to the skirt on the inflow channel side tightens in a circumferential direction under the action of an expansion force of the balloon, such that the pulling suture in the wing-spreading skirt on an outflow channel side is tensioned, and the tensioned pulling suture causes the wing-spreading skirt to protrude outwardly in a radial direction from the stent main body, thereby covering or occluding a paravalvular leak when deployed to a treatment site.