Heart valve prosthesis and methods of manufacture and use
A heart valve prosthesis is provided having a self-expanding multi-level frame that supports a valve body comprising a skirt and plurality of coapting leaflets. The frame transitions between a contracted delivery configuration that enables percutaneous transluminal delivery, and an expanded deployed configuration having an asymmetric hourglass shape. The valve body skirt and leaflets are constructed so that the center of coaptation may be selected to reduce horizontal forces applied to the commissures of the valve, and to efficiently distribute and transmit forces along the leaflets and to the frame. Alternatively, the valve body may be used as a surgically implantable replacement valve prosthesis.
1. A valve prosthesis comprising:
a valve body comprising a plurality of leaflets affixed to a skirt, adjoining leaflets affixed together to form commissures; and
a self-expanding frame comprising an inflow section having a first row of cells in a circumferentially repeating pattern defining an inflow edge of the frame, and an outflow section having a second row of cells in a circumferentially repeating pattern and including a plurality of eyelets;
wherein the area of individual cells in the first row of cells is less than the area of individual cells in the second row of cells;
wherein the frame has a contracted delivery configuration and an expanded deployed configuration, wherein, when the frame is in the expanded deployed configuration, the outflow section diameter is larger than the inflow section diameter;
wherein the frame supports the valve body, wherein a portion of the skirt is folded over the inflow edge of the frame and affixed to the first row of cells and the commissures are sewn to the frame between the first and second rows of cells.
2. The valve prosthesis of claim 1 , wherein the frame comprises a middle region between the inflow section and the outflow section, wherein in the expanded deployed configuration, a middle region diameter of the middle region is smaller than the inflow section diameter.
3. The valve prosthesis of claim 1 , wherein the outflow section includes two eyelets.
4. The valve prosthesis of claim 1 , wherein the skirt further comprises a plurality of end tabs, wherein the end tabs are folded over the inflow edge of the frame and affixed to the first row of cells.
5. The valve prosthesis of claim 1 , wherein the frame has inflow and outflow ends and a plurality of cell patterns that vary in size between the inflow and outflow ends.
6. The valve prosthesis of claim 1 , wherein the leaflets comprise porcine, bovine, equine or other mammalian pericardial tissue, synthetic material or polymeric material.
7. The valve prosthesis of claim 1 , wherein the valve prosthesis is configured to hold a patient's native valve permanently open in the expanded deployed configuration.
8. The valve prosthesis of claim 1 , wherein the outflow section diameter is between 30 mm and 55 mm and the inflow section diameter is between 19 mm and 34 mm.