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. A method for forming an intraocular lens comprising an optic and a haptic, the method comprising:
combining a first unsaturated silicone fluid, a first hydride crosslinking agent and a first platinum catalyst to form said optic;
combining a second unsaturated silicone fluid, a second hydride crosslinking agent and a second platinum catalyst to form said haptic such that said optic and said haptic have a common refractive index and a different modulus of elasticity, wherein the entire optic has a modulus of elasticity of less than 100 kPa, and wherein the entire haptic has a modulus of elasticity of greater than 500 kPa; and
joining said optic and said haptic to form an intraocular lens,
wherein the first unsaturated silicone fluid and the second unsaturated silicone fluid are the same.
2. A method for forming an intraocular lens according to claim 1 , wherein said first hydride crosslinking agent and said second hydride crosslinking agent are the same.
3. A method for forming an intraocular lens according to claim 1 , wherein said first platinum catalyst and said second platinum catalyst are the same.
4. A method for forming an intraocular lens according to claim 1 , wherein said first unsaturated silicone fluid comprises a divinyl terminated silicone monomer.
5. A method for forming an intraocular lens according to claim 1 , wherein said first unsaturated silicone fluid comprises monomers having Formula 1:
wherein the sum of m and n is x, x ranges from 1 to 1200, y ranges from 1 to 500, and z ranges from 0 to 500, the sum of x, y, and z is at least 15, and R′ and R″are independently selected from the group consisting of CH 3 , C 6 H 5 , and CH═CH 2 .
6. A method for forming an intraocular lens according to claim 1 , wherein said first unsaturated silicone fluid and said second unsaturated silicone fluid comprise monomers selected from octamethylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, tetravinyltetramethylcyclotetrasiloxane, 1,3-divinyhetramethyldisiloxane, and combinations thereof.
7. A method for forming an intraocular lens according to claim 1 , wherein said first hydride crosslinking agent and said second hydride crosslinking agent individually are 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(dimethylsilyPethane; 1,1,3,3-tetramethyldisilazane; hydride terminated polyphenyl- (di-methylhydro siloxy) siloxane; and combinations thereof.
8. A method for forming an intraocular lens according to claim 1 , wherein said first hydride crosslinking agent is phenyltris(dimethylsiloxy)silane and said second hydride crosslinking agent is phenyltris(dimethylsiloxy)silane.
9. A method for forming an intraocular lens according to claim 1 , wherein said first platinum catalyst and said second platinum catalyst are individually selected from the group consisting of platinum carbonyl cyclovinylmethylsiloxane complex, platinum-cyclovinylmethylsiloxane complex, platinum octanaldehyde complex, platinum octaoctanol complex; and combinations thereof.