Polymeric material for accommodating intraocular lenses
The disclosure relates generally to a polymeric material for use in accommodating intraocular lenses for implantation in a lens chamber of a subject's eye. The present disclosure is directed to a polymeric material which comprises a fluorosilicone polymer and a silica component. The presently disclosed polymeric material is both optically clear and has a sufficiently low Young's modulus such that it can effectively respond to the eye's natural accommodative forces and thus can be used in accommodating intraocular lenses. When used in the fabrication of an intraocular lenses, the polymeric material disclosed herein protect the physical characteristics of the lens as the added hydrophobicity of the fluorosilicone polymer allows it to effectively resist diffusion of fluid from the eye and the adhesion of biologica materials.
1. A polymeric material comprising a fluorosilicone polymer and up to about 30 weight % of a silica component, wherein the silica component has a surface area of at least about 280 m 2 /g, and wherein the fluorosilicone polymer comprises a polymer of formula
wherein:
n and m are each independently 0 to about 500;
t is about 100 to about 1000;
each R 1 is independently alkyl or aryl; each R 2 is independently fluoroalkyl;
each R 3 is independently alkyl or fluoroalkyl;
each R 4 and R 5 is independently alkyl, fluoroalkyl or aryl;
at least one R 1 , R 4 or R 5 is aryl; and
each X is a crosslinker which links the polymer of formula (I) with a second polymer of formula (I);
wherein the polymeric material has a Young's modulus of from about 10 psi to about 150 psi.
2. The polymeric material of claim 1 , wherein the silica component has a surface area of from about 280 m 2 /g to about 350 m 2 /g.
3. The polymeric material of claim 1 , comprising about 20% to about 27% of the silica component.
4. The polymeric material of claim 1 , wherein the fluorosilicone polymer comprises a crosslinked copolymer of dialkyl, diphenyl or phenylalkyl siloxane and fluorinated dialkyl siloxane.
5. The polymeric material of claim 1 , wherein the fluorosilicone polymer comprises a crosslinked copolymer of diphenyl, phenylalkyl, or dialkyl siloxane and trifluoroalkyl(alkyl)siloxane.
6. The polymeric material of claim 1 , wherein R 2 is 3,3,3-trifluoropropyl.
7. The polymeric material of claim 6 , comprising at least about 25 mole % trifluoropropyl content.
8. The polymeric material of claim 1 , having a refractive index of from about 1.35 to about 1.40.
9. The polymeric material of claim 1 , having a tensile strength of from about 500 psi to about 1200 psi.
10. The polymeric material of claim 1 , having a percent elongation of from about 400% to about 1000%.
11. The polymeric material of claim 1 , having a degree of polymerization of from about 200 to about 500.
12. The polymeric material of claim 1 , having a Young's modulus of from about 50 psi to about 100 psi.
13. The polymeric material of claim 1 , wherein the crosslinker is a methylhydrosiloxane-dimethylsiloxane copolymer.
14. The polymeric material of claim 13 , wherein the crosslinker has a chain length of from about 5 to about 30 repeating Si units.
15. The polymeric material of claim 13 , wherein the crosslinker has a methyl-hydrogen content of from about 30 to about 70 mole %.
16. An implantable intraocular lens (IOL) comprising the polymeric material of claim 1 .
17. A method of making the polymeric material of claim 1 , comprising the steps of:
(a) combining a vinyl end-capped fluorosilicone polymer with up to about 30 weight % of a silica component, wherein the silica component has a surface area of at least about 280 m 2 /g, to obtain a fluorosilicone base composition;
(b) adding a crosslinking agent and a curing agent to the fluorosilicone base composition; and
(c) curing the fluorosilicone base composition to obtain the polymeric material.
18. An intraocular lens (IOL) device comprising:
(a) a first lens comprising the polymeric material of claim 1 having a first Young's modulus;
(b) a second lens in spaced relation to the first lens along a central optical axis; and
(c) a circumferential portion encircling the first and second lens, the circumferential portion comprising an outer peripheral edge;
wherein at least one of a portion of the second lens and a portion of the circumferential portion is made of a material having a second Young's modulus; and
wherein the first Young's modulus is less than the second Young's modulus.
19. A polymeric material comprising a crosslinked copolymer of dialkyl, diphenyl or phenylalkyl siloxane and fluorinated dialkyl siloxane, and up to about 30 weight % of a silica component, wherein the silica component has a surface area of at least about 280 m 2 /g, and wherein the polymeric material has a Young's modulus of from about 10 psi to about 150 psi.
20. A polymeric material comprising a crosslinked copolymer of diphenyl, phenylalkyl, or dialkyl siloxane and trifluoroalkyl(alkyl)siloxane and up to about 30 weight % of a silica component, wherein the silica component has a surface area of at least about 280 m 2 /g, and wherein the polymeric material has a Young's modulus of from about 10 psi to about 150 psi.
21. A polymeric material comprising a crosslinked terpolymer of diphenyl and/or phenylalkyl siloxane, dialkyl siloxane, and trifluoroalkyl(alkyl) siloxane, and up to about 30 weight % of a silica component, wherein the silica component has a surface area of at least about 280 m 2 /g, and wherein the polymeric material has a Young's modulus of from about 10 psi to about 150 psi.