Prosthetic heart valves with elastic support structures and related methods
Prosthetic heart valves having elastic leaflets and an elastic support structure are described. The support structure can store a load transferred from the leaflets as potential energy and then release it in the form of kinetic energy to exhibit a precursory transition from the closed position to the open position. The support structures can exhibit a sinusoidal movement profile at a base edge during the precursory transition.
1. A prosthetic heart valve, comprising:
a plurality of leaflets, wherein each leaflet is synthetic and has a first modulus of elasticity between 10 and 45 MegaPascals (MPa); and a support structure having a periphery and a second modulus of elasticity between 3000 and 5000 MPa:
a plurality of synthetic projections coupled with the plurality of synthetic leaflets;
a base located upstream of the plurality of synthetic projections and comprising an edge that extends around the periphery of the support structure, wherein the plurality of synthetic projections and the base are elastic,
wherein the prosthetic heart valve has a closed position and an open position and the plurality of synthetic leaflets and the support structure move between the closed position and the open position,
wherein each of the plurality of synthetic leaflets has an upstream end and each projection of the plurality of projections has a downstream end, and wherein the upstream edge comprises a sinusoidally-shaped surface in the closed position and a reversed-profile sinusoidally shaped surface in the open position.
2. The prosthetic heart valve of claim 1 , wherein the prosthetic valve moves from the closed position to the open position when the transvalve fluid pressure is 90-99.9% of the peak negative pressure.
3. The prosthetic heart valve of claim 1 , wherein the prosthetic valve moves from the closed position to the open position when the transvalve fluid pressure is 85-95% of the peak negative pressure.
4. The prosthetic heart valve of claim 1 , wherein the prosthetic valve moves from the closed position to the open position when the transvalve fluid pressure is 26-75% of the peak negative pressure.
5. The prosthetic heart valve of claim 1 , wherein the edge comprises a first location upstream from each downstream end of the plurality of projections such that a plurality of first locations are present on the edge; and
a second location upstream from each upstream end of the plurality of leaflets such that a plurality of second locations are present on the edge,
wherein, at a first time during movement of the support structure from the closed position to the open position, each first location moves in a upstream direction and each second location moves in an downstream direction.
6. The prosthetic heart valve of claim 5 , wherein each first location of the edge moves in a downstream direction and each second location of the edge moves in an upstream direction continually as the transvalve fluid pressure transitions from 75% of the peak negative pressure to zero.
7. The prosthetic heart valve of claim 5 , wherein each first location of the edge moves in a downstream direction and each second location of the edge moves in an upstream direction in response to the transvalve fluid pressure transitioning from the peak negative pressure to a less negative pressure.
8. The prosthetic heart valve of claim 5 , wherein, at the first time, each downstream end of the plurality of projections moves in a radially outward direction.
9. The prosthetic heart valve of claim 1 , wherein the plurality of synthetic leaflets begin to exit a coapted state at the first time.
10. The prosthetic heart valve of claim 1 , wherein the plurality of leaflets have a first elasticity and the support structure has a second elasticity, the first elasticity being in the range of 20-35 Meg Pascals (MPa) and the second elasticity being in the range of 3300-3500 MPa.