Inverted heart valve for transcatheter valve replacement
A valve for endovascular heart valve repair that provides improved sealing of the valve against the native wall. The valve assembly has a sealing region at a distal end of the valve. The sealing region having a delivery position and a sealing position, wherein in the delivery position, the sealing region has a first length, and in the sealing position, the sealing region has a second length less than the first length and a thickness in the sealing position is greater in the sealing position than in the delivery position.
1. A system for endovascular heart valve repair, the system comprising:
a delivery catheter comprising a retractable sheath and a tip near a distal end of the catheter; and
a valve assembly disposed within the retractable sheath in a delivery position, the valve assembly comprising:
an expandable stent having a proximal end and a distal end, the expandable stent having an outer surface and an inner surface defining a stent lumen; and
a valve in an inverted orientation having a proximal end and a distal end, the proximal end of the valve connected to the distal end of the expandable stent, the valve having an outer surface and an inner surface defining a valve lumen, wherein the valve extends distally from the distal end of the expandable stent between the expandable stent and the tip when the valve assembly is in the delivery position.
2. The system of claim 1 , further comprising:
at least one cable wire removably connected to the valve at least substantially near the distal end of the valve.
3. The system of claim 2 , wherein, after the expandable stent has been at least partially expanded, the at least one cable wire is pulled in a proximal direction to pull the distal end of the valve through the valve lumen and through at least a portion of the stent lumen to transpose the valve from the inverted orientation in the delivery position to a deployed position.
4. The system of claim 3 , further comprising:
at least one locking feature on the expandable stent.
5. The system of claim 4 , wherein the at least one locking feature is substantially near the distal end of the expandable stent.
6. The system of claim 4 , wherein when the valve is in the deployed position, the at least one locking feature on the stent is engaged with the valve.
7. The system of claim 6 , wherein the at least one locking feature on the stent is engaged with the distal end of the valve.
8. The system of claim 6 , wherein when the locking feature on the stent is engaged with the valve, the at least one cable wire is disconnected from the valve.
9. The system of claim 1 , further comprising:
at least one gripping finger removably engaged with the proximal end of the expandable stent.
10. The system of claim 9 , wherein the at least one gripping finger is disposed between the retractable sheath and an inner shaft of the delivery catheter.
11. The system of claim 9 , wherein after the expandable stent has been at least partially expanded, a retrieving force may be applied to the at least one gripping finger in a proximal direction to pull the valve assembly into the retractable sheath for repositioning of the valve assembly.
12. The system of claim 1 , further comprising:
a sterilized packaging system for storing the valve assembly in a stored position prior to loading the valve assembly within the retractable sheath, the sterilized packaging system comprising at least one fluid chamber, wherein in the stored position, the valve is stored wet within the fluid chamber and operably connected to the delivery catheter.
13. A method of endovascularly delivering a heart valve assembly, the method comprising:
retracting a retractable sheath of a delivery catheter, wherein a valve assembly is disposed within the retractable sheath, the valve assembly comprising an expandable stent and an inverted valve having a proximal end connected to a distal end of the expandable stent, wherein the inverted valve extends distally from the expandable stent towards a distal end of the delivery catheter;
expanding the valve assembly from the delivery position into an expanded position; and
pulling a distal end of the inverted valve through the valve lumen and at least a portion of the stent lumen to a deployed position using at least one cable wire connected to the inverted valve.
14. The method of claim 13 , further comprising:
locking the distal end of the inverted valve to the stent.
15. The method of claim 14 , further comprising:
releasing the at least one cable wire from the inverted valve.
16. The method of claim 13 , further comprising:
recapturing the valve assembly through the retractable sheath to reposition the valve assembly.
17. The method of claim 13 , further comprising:
loading the valve into the retractable sheath by pulling the valve proximally within the retractable sheath.
18. The method of claim 13 , wherein the valve is stored in a sterilant within a packaging system and the valve assembly is connected to the cable wire while stored within the packaging system.
19. A valve assembly for endovascular heart valve repair, the valve assembly comprising:
an expandable stent having a proximal end and a distal end, the expandable stent having an outer surface and an inner surface defining a stent lumen; and
a valve having a proximal end and a distal end, the proximal end of the valve connected to the distal end of the expandable stent, the valve having an outer surface and an inner surface defining a valve lumen,
wherein the valve is in an inverted orientation in a delivery position of the valve assembly and wherein the valve is disposed within the stent lumen in a deployed position.