High refractive index oxygen permeable contact lens system and method
AssigneeParagon Vision Sciences, Inc.
InventorsHermann Neidlinger, Ewa Cichacz, William E. Meyers
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Abstract
A new high refractive index, oxygen permeable contact lens material and method for making the same. The material comprises an alkyl acrylate, a fluoro acrylate, a silicone acrylate, a polymerizable vinyl monomer having a substituted aromatic ring and/or heterocyclic ring structure, a multifunctional acrylate, and a polymerizable vinyl monomer having a heterocyclic ring structure.
Claims18
A high refractive index oxygen permeable contact lens comprising a cross linked polymeric material comprising:
- an alkyl acrylate present in an amount of between about 7% to about 15% by weight of the cross linked polymeric material;
- a fluoro acrylate present in an amount of between about 1% to about 4% by weight of the cross linked polymeric material;
- a silicone acrylate present in an amount of between about 10% to about 70% by weight of the cross linked polymeric material;
- n-vinyl carbazole present in an amount of between about 20% to about 40% by weight of the cross linked polymeric material;
- a cross-linking agent present in an amount of between about 0.1% to about 15% by weight of the cross linked polymeric material;
- and
- n-vinyl pyrrolidone present in an amount of between about 2% to about 20% by weight of the cross linked polymeric material;
- wherein the weight percentage of the n-vinyl pyrrolidone is about one third of the weight percentage of the n-vinyl carbazole;
- and
- wherein the contact lens has an index of refraction that is greater than 1.51 and an oxygen permeability of greater than 22 Barrers.
A method of formulating a high refractive index oxygen-permeable contact lens comprising a cross linked polymeric material comprising the steps of:
- combining by weight percent of the cross linked polymeric material:
- about 7-15% methylmethacrylate;
- about 1-4% trifluoroethylmethacrylate;
- about 10-70% silicone acrylate;
- about 20-40% n-vinyl carbazole;
- about 0.1-15% ethylene glycol dimethacrylate;
- about 2-20% by weight n-vinyl pyrrolidone;
- and
- selecting relative weight percentages of n-vinyl pyrrolidone and n-vinyl carbazole according to a linear relationship between the n-vinyl pyrrolidone and n-vinyl carbazole components to achieve a contact lens material having an oxygen permeability (Dk) of at least 22 Barrers and a refractive index of at least 1.51,
- wherein the weight percentage of the n-vinyl pyrrolidone is about one third of the weight percentage of the n-vinyl carbazole.
A high refractive index oxygen permeable contact lens comprising a cross linked polymeric material comprising:
- an alkyl acrylate present in an amount of between about 7% to about 15% by weight of the cross linked polymeric material;
- a fluoro acrylate present in an amount of between about 1% to about 4% by weight of the cross linked polymeric material;
- a silicone acrylate present in an amount of between about 10% to about 70% by weight of the cross linked polymeric material;
- n-vinyl carbazole present in an amount of between about 20% to about 40% by weight of the cross linked polymeric material;
- a cross-linking agent present in an amount of between about 0.1% to about 15% by weight of the cross linked polymeric material;
- and
- n-vinyl pyrrolidone present in an amount of between about 2% to about 20% by weight of the linked polymeric material;
- wherein the weight percentage of the n-vinyl pyrrolidone is adjusted to about one third of the weight percentage of the n-vinyl carbazole to achieve dissolution of the n-vinyl carbazole and to obtain an optically clear material;
- and
- wherein the contact lens has an index of refraction that is greater than 1.51 and an oxygen permeability of greater than 22 Barrers.
Dependencies are inferred from the claim text.