Prosthetic tissue valve
View Patent ↗A prosthetic tissue valve for aortic, pulmonary, mitral or tricuspid valve replacement is described herein. A sewing ring for use with the prosthetic tissue valve is also described. The valve can have a circumference that is a predetermined distance larger than the circumference of an annulus in a defective valve. The valve can be substantially planar in an unstressed position before attachment at the annulus and substantially non-planar upon attachment in a biased position at the annulus. Methods are provided for placing the valve as described herein in the biased position within the annulus of the defective valve.
1. A valve for controlling fluid flow in a lumen having an annulus, the valve comprising:
a sewing ring having an inner portion and an outer portion, wherein the sewing ring is substantially planar in an unstressed position, wherein, in the unstressed position, the outer portion of the sewing ring defines an operative circumference of the sewing ring, wherein the diameter of the sewing ring in the unstressed position is larger than the diameter of the annulus, and wherein the outer portion of the sewing ring is configured for attachment to the annulus in a biased position; and
a plurality of leaflets securely attached to the inner portion of the sewing ring, wherein, when the sewing ring is in the unstressed position, the plurality of leaflets are substantially co-planar with the sewing ring,
wherein, upon attachment of the sewing ring to the annulus in the biased position, the sewing ring is substantially non-planar, the plurality of leaflets are substantially non-planar and at least a portion of at least one leaflet of the plurality of leaflets is superposed relative to at least a portion at least one of the adjacent leaflets of the plurality of leaflets, wherein a distal end of each leaflet extends radially inwardly relative to the inner portion of the sewing ring generally toward a center point on the valve, and wherein at least a portion of the leaflets of the plurality of leaflets comprises extracellular matrix material.
2. The valve of claim 1 , wherein at least a portion of the sewing ring comprises extracellular matrix material.
3. The valve of claim 1 , wherein the outer portion of the sewing ring is configured for attachment to an annulus in a heart of a subject.
4. The valve of claim 3 , wherein, upon attachment of the sewing ring to the annulus in the biased position, at least a portion of the valve is configured for communication with the circulation of the subject.
5. The valve of claim 1 , wherein the leaflets of the plurality of leaflets are spaced substantially equally along the inner portion of the sewing ring.
6. The valve of claim 1 , wherein the sewing ring is configured to attach to the annulus such that at least a portion of at least one leaflet of the plurality of leaflets underlies at least a portion of at least one of the adjacent leaflets of the plurality of leaflets.
7. The valve of claim 1 , wherein the sewing ring is further configured to attach to the annulus such that at least a portion of at least one leaflet of the plurality of leaflets overlies at least a portion of at least one of the adjacent leaflets of the plurality of leaflets.
8. The valve of claim 1 , wherein the outer portion of the sewing ring is substantially circular.
9. The valve of claim 1 , wherein the plurality of leaflets comprises two leaflets.
10. The valve of claim 1 , wherein the plurality of leaflets comprises three leaflets.
11. The valve of claim 1 , wherein the leaflets of the plurality of leaflets are configured to control blood flow through an annulus in a heart.
12. The valve of claim 1 , wherein the ratio of the diameter of the sewing ring to the diameter of the annulus is configured to range from about 1.01:1 to about 3.00:1.
13. The valve of claim 1 , wherein the ratio of the diameter of the sewing ring to the diameter of the annulus is configured to range from about 1.70:1 to about 2.10:1.
14. The valve of claim 1 , wherein the diameter of the sewing ring ranges from about 20 mm to about 70 mm.
15. The valve of claim 1 , wherein the diameter of the sewing ring ranges from about 35 mm to about 45 mm.
16. The valve of claim 1 , wherein at least a portion of the sewing ring comprises metal.
17. The valve of claim 1 , wherein at least a portion of the sewing ring comprises a shape memory activated material.
18. The valve of claim 2 , wherein at least a portion of the sewing ring comprises a polymeric material.
19. The valve of claim 18 , wherein the extracellular matrix material is electrospun and applied to the polymeric material to produce the sewing ring.
20. The valve of claim 1 , wherein the sewing ring is integrally formed with the plurality of leaflets.
21. A valve for controlling fluid flow in a lumen having an annulus, the valve comprising:
a sewing ring having an inner portion and an outer portion, wherein the sewing ring is substantially planar in an unstressed position, wherein, in the unstressed position, the outer portion of the sewing ring defines an operative circumference of the sewing ring, wherein the diameter of the sewing ring in the unstressed position is larger than the diameter of the annulus, and wherein the outer portion of the sewing ring is configured for attachment to the annulus in a biased position; and
a plurality of leaflets securely attached to the inner portion of the sewing ring, wherein, when the sewing ring is in the unstressed position, the plurality of leaflets are substantially coplanar with the sewing ring; and
means for attaching the sewing ring to the annulus in the biased position, wherein, in the biased position, the sewing ring is substantially non-planar, the plurality of leaflets are substantially non-planar and at least a portion of at least one leaflet of the plurality of leaflets is superposed relative to at least a portion of at least one of the adjacent leaflets of the plurality of leaflets, and wherein, in the biased position, a distal end of each leaflet of the plurality of leaflets extends radially inwardly relative to the inner portion of the sewing ring generally toward a center point on the valve, and
wherein at least a portion of the leaflets of the plurality of leaflets comprises extracellular matrix material.