Low profile prosthetic mitral valve
A low-profile prosthetic valve for treating a native valve includes a radially expandable frame having an expanded configuration and a collapsed configuration. The atrial end of the prosthetic valve forms a flared shape that engages an atrial surface of the native valve. The flare shape flares downward toward a ventricle of the native valve when initially expanded followed by inversion of the flared shape to form a tapered shape tapering toward the ventricle and flaring toward the atrium of the native valve when fully expanded. The prosthetic valve also has a plurality of prosthetic valve leaflets that open and close to control fluid flow through the prosthetic valve.
1. A method for delivering a prosthetic valve to a native valve in a heart of a patient, said method comprising:
providing a delivery catheter carrying the prosthetic valve;
positioning the prosthetic valve adjacent the native valve;
partially deploying the prosthetic valve so the prosthetic valve forms a flared shape disposed above the native valve and flaring toward a ventricle of the heart;
inverting the flared shape so the initial flared shape becomes a tapered shape disposed above the native valve contacting the native valve, and tapering toward the ventricle;
radially expanding a plurality of ventricular anchors or ventricular wings on a ventricular end of the prosthetic valve to engage a ventricular surface of the native valve; and
releasing the prosthetic valve from the delivery catheter.
2. The method of claim 1 , wherein radially expanding the plurality of ventricular anchors or ventricular wings comprises anchoring at least some of the plurality of ventricular anchors on a fibrous trigone of the native valve or a posterior ventricular portion of the native valve.
3. The method of claim 1 , wherein radially expanding the plurality of ventricular anchors or ventricular wings comprises radially expanding a plurality of ventricular wings from a position substantially parallel with a longitudinal axis of the prosthetic valve to a position extending radially outward from the longitudinal axis, and engaging the plurality of ventricular wings with a ventricular surface of the native valve.
4. The method of claim 3 , wherein each of the plurality of ventricular wings comprises:
a first opposed end;
a second opposed end; and
a curved connector connecting the first and second opposed ends;
wherein each of the plurality of ventricular wings is attached to the prosthetic valve proximate the first and second opposed ends.
5. The method of claim 4 , wherein in the flared shape, each of the first and second opposed ends are closer together as compared to in the tapered shape.
6. The method of claim 4 , wherein each of the curved connectors is radially expand from the flared shape to the tapered shape.
7. The method of claim 4 , wherein:
in the flared shape, each of the plurality of ventricular wings are inside the prosthetic valve; and
in the tapered shape each of the plurality of ventricular wings are outside the prosthetic valve.
8. The method of claim 4 , wherein:
in the flared shape, each of the plurality of ventricular wings are disposed inside an annular ring attached to the prosthetic valve; and
in the tapered shape each of the plurality of ventricular wings are positioned against the annular ring.
9. The method of claim 8 , wherein in the tapered shape, each of the plurality of ventricular wings forms a flange pivotable against the annular ring.
10. The method of claim 3 , wherein the first and second opposed ends are attached to a Y-shaped strut of the prosthetic valve.
11. The method of claim 10 , wherein the Y-shaped strut comprises first, second and third prongs and each of the plurality of ventricular wings is attached to two of the first, second and third prongs of the Y-shaped strut.
12. The method of claim 3 , wherein in both the flared shape and tapered shape each of the plurality of ventricular wings is out of plane with the prosthetic valve.
13. The method of claim 3 , wherein the plurality of ventricular wings consists of three ventricular wings.
14. The method of claim 1 , further comprising reducing or eliminating regurgitation across the prosthetic valve.
15. The method of claim 1 , wherein the native valve is a mitral valve.
16. The method of claim 1 , wherein releasing the prosthetic valve from the delivery catheter comprises disengaging a plurality of commissure posts on the prosthetic valve from the delivery catheter.
17. The method of claim 1 , wherein releasing the prosthetic valve from the delivery catheter comprises disengaging a plurality of locking tabs on the plurality of ventricular anchors from the delivery catheter.
18. The method of claim 1 , wherein the tapered shape engages an atrial surface of the native valve.