Durable high strength polymer composite suitable for implant and articles produced therefrom
View Patent ↗A thin, biocompatible, high-strength, composite material is disclosed that is suitable for use in various implanted configurations. In one aspect, the composite material maintains flexibility in high-cycle flexural applications, making it particularly applicable to high-flex implants such as heart pacing lead or heart valve leaflet. The composite material includes a porous expanded fluoropolymer membrane and an elastomer, wherein the elastomer fills substantially all of the pores of the porous expanded fluoropolymer, and the composite material comprising less than about 80% fluoropolymer by weight.
1. A prosthetic valve comprising:
a support structure including a plurality of posts; and
a leaflet coupled to each of the plurality of posts, each leaflet movable between open and closed positions, each leaflet including at least three layers of a composite material, the composite material including a fluoropolymer layer having a plurality of pores and an elastomer present in substantially all of the pores of the fluoropolymer layer, the at least three layers of composite material being coupled together with a layer of the elastomer between each of the at least three layers of composite material.
2. The prosthetic valve of claim 1 , wherein the composite material comprises less than about 80% fluoropolymer by weight.
3. The prosthetic valve of claim 1 , wherein the composite material comprises less than about 60% fluoropolymer by weight.
4. The prosthetic valve of claim 1 , wherein the composite material comprises less than about 50% fluoropolymer by weight.
5. The prosthetic valve of claim 1 , wherein the elastomer is a fluoroelastomer.
6. The prosthetic valve of claim 5 , wherein the elastomer is a TFE/PMVE copolymer.
7. The prosthetic valve of claim 6 , wherein the copolymer consists essentially of between about 40 and 80 weight percent perfluoromethyl vinyl ether and complementally 60 and 20 weight percent tetrafluoroethylene.
8. The prosthetic valve of claim 1 , wherein fluoropolymer of each fluoropolymer layer is PTFE.
9. The prosthetic valve of claim 8 , wherein the PTFE is ePTFE.
10. The prosthetic valve of claim 9 , wherein each fluoropolymer layer has a matrix tensile strength in at least one direction greater than about 96 MPa.
11. The prosthetic valve of claim 9 , wherein the composite material comprises less than about 50% fluoropolymer by weight.
12. The prosthetic valve of claim 1 , wherein each leaflet has a thickness of less than about 350 μm.
13. The prosthetic valve of claim 1 , wherein each leaflet has a thickness of less than about 300 μm.
14. The prosthetic valve of claim 1 , wherein each leaflet has a thickness of less than about 200 μm.
15. The prosthetic valve of claim 1 , wherein each leaflet has a thickness of less than about 100 μm.
16. The prosthetic valve of claim 1 , wherein each leaflet has a thickness of less than about 50 μm.
17. The prosthetic valve of claim 1 , wherein each leaflet has a thickness of less than about 25 μm.
18. The prosthetic valve of claim 1 , wherein the EOA across the prosthetic valve is maintained within about 10% after about 40 million cycles.
19. The prosthetic valve of claim 1 , wherein a regurgitant fraction across the prosthetic valve is maintained below about 15% after about 40 million cycles.
20. The prosthetic valve of claim 1 , wherein each leaflet is devoid of edge delamination or hole formation after about 40 million cycles.
21. A prosthetic heart valve comprising:
a support structure including a plurality of posts; and
a leaflet coupled to each of the plurality of posts, each leaflet movable between open and closed positions, each leaflet including at least three layers of a composite material, the composite material including a fluoropolymer layer having a plurality of pores and an elastomer present in substantially all of the pores of the fluoropolymer layer, the at least three layers of composite material being coupled together with a layer of the elastomer between each of the at least three layers of composite material,
wherein the fluoropolymer layer of the composite material has a thickness of less than 12 microns.
22. A prosthetic valve comprising:
a support structure including a plurality of posts; and
a leaflet coupled to each of the plurality of posts, each leaflet movable between open and closed positions, each leaflet including at least three layers of a composite material, the composite material including a fluoropolymer layer having a plurality of pores and an elastomer in a portion of the pores, the at least three layers of composite material being coupled together with a layer of the elastomer between each of the at least three layers of composite material, wherein each fluoropolymer layer has a thickness that is less than about 6 microns.
23. The prosthetic valve of claim 22 , wherein each leaflet comprises less than 80% fluoropolymer by weight.
24. The prosthetic valve of claim 22 , wherein the elastomer is present in substantially all of the pores of the fluoropolymer layer.