One-way limiting expandable artificial biological heart valve

A one-way limiting expandable artificial heart 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 comprises a one-way limiting expandable annular metal seat, the annular metal seat is composed of three sections of seat body units connected in a staggered overlapping manner from head to tail end, the head end of each seat body unit is sequentially provided with a first rivet, a limiting protrusion and a first long circular groove, 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 an 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 the second limiting hole and the first limiting hole of the adjacent seat body unit respectively and can move in one direction,
• the artificial heart valve has an original state of normal use and a one-way limiting expansion state, and each seat body unit forms the one-way limiting expansion state after synchronous one-way rotation and external expansion,
• the limiting protrusion is a semicircular protrusion inclined upward along the expansion direction, the limiting hole has a shape matched with the limiting protrusion, and the length of the first long circular groove, the length of the second long circular groove and the distance between the two limiting holes are consistent,
• a head end of each single seat body unit is disposed inside a tail end of an adjacent seat body unit, and the valve seat is made of Elgiloy alloy, cobalt-chromium alloy, nickel-titanium alloy, or implantable stainless steel.