Presettable artificial biological aortic valve

A presettable artificial biological aortic valve, comprising a valve seat, a valve leaflet stent and three valve leaflets attached to the valve leaflet stent, characterized in that,

• the valve seat is a one-way limiting expandable annular metal seat, the annular metal seat is composed of three sections of seat body units connected with each other in a staggered manner from the head end to the tail end in inside and outside, the head end of each seat body unit is sequentially provided with a first rivet, a limiting protrusion and a first long circular groove from the outside to the inside, the tail end of each seat body unit is sequentially provided with a second long circular groove matched with the first rivet at the head end of the adjacent seat body unit, a second limiting hole and a first limiting hole matched with the limiting protrusion respectively, and a second rivet matched with the first long circular groove,
• the first long circular groove of each seat body unit is matched with the second rivet of the adjacent seat body unit and can move in one direction, the second long circular groove of each seat body unit is matched with the first rivet of the adjacent seat body unit and can move in one direction, the limiting protrusion of each seat body unit is matched with first limiting hole and the second limiting hole of the adjacent seat body unit respectively and can move in one direction, the middle part of each seat body unit is provided with a wavy protrusion,
• the presettable artificial biological aortic valve has a preset original state and a normal use state after one-way limiting and expanding, and each seat body unit forms the normal use state as the existing surgical biological aortic valve,
• before the valve formed by the three valve leaflets is in the one-way limiting expansion state, an original preset state is an abnormal use state, except that a valve effect of one-way blood flow is implemented when the valve is in the one-way limiting expansion state through a balloon external force to a normal use state same as that of an existing surgical artificial biological aortic valve;
• the limiting protrusion is a semicircular protrusion inclined upward along the expansion direction, and the limiting hole has a shape matched with the limiting protrusion.