Self-expanding biological valve

A self-expanding biological valve, comprising a fixing stent, an inflow end support structure, an outflow end support structure and a silica gel suture ring, wherein the fixing stent comprises three stretching parts, which are positioned at a lower edge position of junctions of three valve leaflets of the fixing stent, respectively;

• the inflow end support structure and the outflow end support structure are arranged on the fixing stent, and in an unfolded state, the inflow end support structure and the outflow end support structure extend outwards relative to the fixing stent in a radial direction and are used for supporting the valve at a predetermined position and continuously applying an outward and/or downward force to surrounding tissues, so as to ensure reliable fixation of the valve;
• the silica gel suture ring is arranged at a valve annulus plane position on the fixing stent, and the valve is sutured with the surrounding human tissues in a three-point positioning way by the silica gel suture ring, so as to ensure that the three valve leaflets in the valve are positioned at proper positions in the valve annulus plane.