Artificial valve and valve delivery system

An artificial valve, comprising a top stent, a middle stent and a bottom stent, wherein the top stent, the middle stent and the bottom stent are connected in sequence;

• the top stent is circumferentially provided with at least three locking stents, which have locking ends at top ends;
• the middle stent is provided with valve leaflet fixing parts, and structural stiffness of the top stent is smaller than structural stiffness of the middle stent,
• wherein the middle stent comprises three suture rods, which are the valve leaflet fixing parts;
• and a number of the locking stents is three, and a structural stiffness of a locking end of each of the locking stents is 5% to 50% of a structural stiffness of each of the suture rods.

An artificial valve, comprising a top stent, a middle stent and a bottom stent, wherein the top stent, the middle stent and the bottom stent are connected in sequence;

• the top stent is circumferentially provided with at least three locking stents, which have locking ends at top ends;
• the middle stent is provided with valve leaflet fixing parts;
• and
• the middle stent further comprises suture rods and connection rods;
• the locking stents, the suture rods, the connection rods and the bottom stent are connected in sequence to form an integrated structure;
• a maximum area of a cross section of the locking stent which is perpendicular to a central axis of the artificial valve is 20% to 50% of a minimum area of a cross section of the suture rod which is perpendicular to the central axis of the artificial valve.

A valve delivery system, comprising an artificial valve and a delivery device, wherein

• the artificial valve comprises a top stent, a middle stent and a bottom stent;
• the top stent, the middle stent and the bottom stent are connected in sequence;
• the top stent is circumferentially provided with at least three locking stents;
• each of the locking stents has a locking end at a top;
• the middle stent is provided with at least three valve leaflet fixing parts;
• and
• the delivery device comprises a first locking member, a second locking member and a sheath;
• the first locking member and the second locking member are relatively movable;
• the first locking member is provided with a first locking portion;
• the second locking member is provided with a second locking portion;
• a locking position is formed between the first locking portion and the second locking portion;
• an inner diameter of the sheath is larger than a radial dimension of the second locking member;
• the sheath is movably sleeved on the outside of the first locking member and the second locking member;
• and
• when the first locking member and the second locking member move relatively, the locking position is in an unlocked or a locked state;
• in the unlocked state of the locking end, a diameter of a circumference where uppermost edges of the three valve leaflet fixing parts are located is Φ1, and in the locked state of the locking end, the diameter of the circumference where the uppermost edges of the three valve leaflet fixing parts are located is Φ2, which is 74% to 120% of Φ1.