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US 6,617,291 B1Granted
Ophthalmic and contact lens solutions
OwnerFrancis X. Smithinventor
Life of this patent
Estimating the term…
Abstract
The present invention relates to improved ophthalmic solutions that employ allantoin in order to more effectively preserve solutions and to reduce the degree to which cationic preservatives will deposit on contact lenses. Ophthalmic solutions are here understood to include contact lens treatment solutions, such as cleaners, soaking solutions, conditioning solutions and lens storage solutions, as well as wetting solutions and in-eye solutions for treatment of eye conditions.
Claims8
A contact lens solution comprising 0.001 to 1.0 weight percent allantoin;
- and at least one part per million of a cationic polymeric preservative chosen from the group consisting of polyhexainethylene biguanide (phmb), chlorhexidne, and benzalkonium chloride.
Dependencies are inferred from the claim text.