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US 2014/0174962 A1Published application
Silicone Hydrogel Contact Lenses For Sustained Release Of Beneficial Polymers
AssigneeCooperVision International Holding Company, LP
InventorsAndrew Luk, Victoria Rogers, Junhao Ge, Hong Xue, Yuwen Liu, Arthur Back, Yun Zhang, Ying Ye, Peter Zhu
Life of this patent
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Abstract
Silicone hydrogel contact lenses comprising an ionic component sustain release of beneficial cationic polymers.
Claims21
An unworn silicone hydrogel contact lens immersed in a packaging solution and sealed in a package, said contact lens comprising:
- a) a hydrated polymerization product of a monomer mixture comprising at least one silicone monomer and at least one anionic monomer in an amount to provide the polymerization product with an ionic content of about 0.6% to about 2.2%;
- and
- b) a cationic polymer having a molecular weight of about 1,500 to 30,000 electrostatically attached to the hydrated polymerization product, wherein the contact lens sustains release of the cationic polymer for at least 2 hours.
An unworn silicone hydrogel contact lens immersed in a packaging solution and sealed in a package, said contact lens comprising a hydrated polymerization product of a monomer mixture comprising:
- at least one silicone monomer;
- at least one hydrophilic monomer selected from N-vinyl-N-methylacetamide (VMA), N-vinyl pyrrolidone (NVP), or a combination of both VMA and NVP;
- and at least one carboxylic-acid-containing monomer in an amount to provide the hydrated polymerization product with an ionic content of about 1.0% to about 2.2%.
Dependencies are inferred from the claim text.