Polymer compositions suitable for intraocular lenses and related methods
View Patent ↗A polymeric material with a molecular response time that makes it suitable for use near fragile body tissues. The polymeric material is useful for both low modulus and high modulus applications thereby simplifying the multi-part polymeric article manufacturing process and creating better integrated multi-part polymeric articles. Cross-linked polymers with different moduli may be obtained utilizing the same or similar starting materials but modifying the amount of catalyst, the amount of cross-linking agent, and/or the amount of methyl vinyl cyclics.
1. An intraocular lens comprising an optic and a haptic,
wherein an interface portion of the haptic protrudes inside an interface portion of the optic,
wherein said interface portion of said optic has a lower modulus of elasticity than said interface portion of said haptic,
wherein the entire optic has a modulus of elasticity of less than about 100 kPa,
wherein said interface portion of said optic and said interface portion of said haptic comprise a common polymeric material and have a common refractive index, and
wherein the entirety of the optic is capable of forming a focused image when the intraocular lens is implanted in a capsular bag of an eye.
2. An intraocular lens according to claim 1 , wherein said optic and said haptic are formed from a hydride cross-linking agent that is the same for said optic and said haptic.
3. An intraocular lens according to claim 1 , wherein said optic and said haptic are formed from a catalyst that is the same for said optic and said haptic.
4. An intraocular lens according to claim 1 , wherein said common polymeric material is formed from a divinyl terminated silicone fluid.
5. An intraocular lens according to claim 4 wherein said common polymeric material is formed from a polymer having a pendant vinyl group.
6. An intraocular lens according to claim 1 , wherein said common polymeric material is formed from polymers having Formula 1:
wherein the sum of m and n is x, x ranges from about 1 to about 1200, y ranges from about 1 to about 500, and z ranges from about 0 to about 500, the sum of x, y, and z is at least about 15, and R′ and R″ independently are optional pendant groups that may be selected from the group consisting of CH 3 , C 6 H 5 , and CH═CH 2 .
7. An intraocular lens according to claim 1 , wherein said common polymeric material is formed from monomers selected from the group consisting of octamethylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, tetravinyltetramethylcyclotetrasiloxane, 1,3-divinyltetramethyldisiloxane, and combinations thereof.
8. An intraocular lens according to claim 2 , wherein said hydride crosslinking agent is selected from the group consisting of phenyltris(dimethylsiloxy)silane; tetrakis(dimethylsiloxy)silane; 1,1,3,3-tetraisopropyldisiloxane; 1,1,3,3-tetramethyldisiloxane; 1,1,4,4-tetramethyldisilethane bis(dimethylsilyl)ethane; 1,1,3,3-tetramethyldisilazane; hydride terminated polyphenyl-(di-methylhydrosiloxy)siloxane; and combinations thereof.
9. An intraocular lens according to claim 3 , wherein said catalyst is selected from the group consisting of a transition metal catalyst, platinum carbonyl cyclovinylmethylsiloxane complex, platinumcyclovinylmethylsiloxane complex, platinum octanaldehyde complex, platinum octaoctanol compex, and combinations thereof.
10. An intraocular lens according to claim 3 , wherein said catalyst is a platinum catalyst that is present in an amount from about 0.1% to about 0.5% by weight.
11. An intraocular lens according to claim 2 , further comprising a platinum catalyst; further wherein said common polymeric material, said hydride crosslinking agent and said platinum catalyst form a cross-linked polymer having a H/V ratio of about 0.6 to about 1.1.
12. An intraocular lens according to claim 1 , wherein the intraocular lens is movable under the normal muscle movement of the human eye.
13. An intraocular lens according to claim 1 , wherein the intraocular lens is deformable under the normal muscle movement of the human eye.
14. An intraocular lens according to claim 1 , wherein the interface portion of the optic and the interface portion of the haptic have at least about 75% w/w of the same base polymer chain, and, when present, the same cross-linking agent.
15. An intraocular lens according to claim 1 , wherein the interface portion of the optic and the interface portion of the haptic have at least about 90% w/w of the same base polymer chain, and, when present, the same cross-linking agent.
16. An intraocular lens according to claim 1 , wherein a refractive index of the interface portion of the haptic is within 2% of the refractive index of the interface portion of the optic.
17. An intraocular lens comprising an optic having a clear aperture that comprises an inner portion and an outer portion disposed about said inner portion and an intermediate portion between the inner portion and the outer portion, the portions comprising a common polymeric material and have a common refractive index; wherein said inner portion and said outer portion each have a different modulus of elasticity, wherein the intermediate portion includes a modulus of elasticity gradient that varies along a radial direction extending from an inner region of the intermediate portion to an outer region of the intermediate portion, and wherein the entirety of said clear aperture is capable of contributing to a focused image when the intraocular lens is implanted in a capsular bag of an eye.
18. An intraocular lens according to claim 17 , wherein the intraocular lens is movable under the normal muscle movement of the human eye.
19. An intraocular lens according to claim 17 , wherein the intraocular lens is deformable under the normal muscle movement of the human eye.
20. An intraocular lens according to claim 17 , wherein the portions of the clear aperture of the optic have at least about 75% w/w of the same base polymer chain, and, when present, the same cross-linking agent.
21. An intraocular lens according to claim 17 , wherein the portions of the clear aperture of the optic have at least about 90% w/w of the same base polymer chain, and, when present, the same cross-linking agent.
22. An intraocular lens according to claim 17 , wherein the refractive indices of the inner portion, outer portion, and intermediate portion of the clear aperture are within about 2% of each other.
23. An intraocular lens comprising an optic and a haptic,
wherein an interface portion of the haptic protrudes inside an interface portion of the optic,
wherein said interface portion of the optic has a lower modulus of elasticity than the interface portion of the haptic,
wherein at least the interface portion of the optic has a modulus of elasticity of less than about 100 kPa;
wherein said interface portion of said optic and said interface portion of said haptic comprise a common polymeric material and have a common refractive index, and
wherein at least the interface portion of the optic that receives the haptic has an optical power for forming a focused image.
24. An intraocular lens according to claim 23 , wherein the intraocular lens is movable under the normal muscle movement of the human eye.
25. An intraocular lens according to claim 23 , wherein the intraocular lens is deformable under the normal muscle movement of the human eye.
26. An intraocular lens according to claim 23 , wherein the interface portion of the optic and the interface portion of the haptic have at least about 75% w/w of the same base polymer chain, and, when present, the same cross-linking agent.
27. An intraocular lens according to claim 23 , wherein the interface portion of the optic and the interface portion of the haptic have at least about 90% w/w of the same base polymer chain, and, when present, the same cross-linking agent.
28. An intraocular lens according to claim 23 , wherein a refractive index of the interface portion of the haptic is within 2% of the refractive index of the interface portion of the optic.