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US 5,491,091 AGranted
Contact lens disinfecting system
AssigneeSchering Corporation
InventorsSamuel Loshaek, Helmut Singer
Life of this patent
Estimating the term…
Abstract
A method is disclosed for disinfecting contact lenses with peroxide whereby the usual peroxide neutralization step is eliminated. This is accomplished by carrying out the disinfecting process at a hydrogen peroxide concentration of about 0.01 to less than 0.5% (w/v). In the preferred embodiment the peroxide is introduced into the system utilizing an effervescent tablet of an alkali metal perborate, percarbonate or persulfate, or urea peroxide.
Claims5
A process for disinfecting a contact lens comprising:
- (a) providing a fixed quantity of aqueous liquid;
- (b) dissolving a unit dose of a solid composition in the aqueous liquid to form a disinfecting solution, said unit dose comprising:
- (1) sufficient solid peroxide source to cause the disinfecting solution to have a concentration of 0.01 to less than 0.5 percent weight/volume hydrogen peroxide.
- (2) solid carbonate or bicarbonate, and
- (3) organic acid;
- (c) contacting the lens with the disinfecting solution at room temperature for a time sufficient to disinfect the lens;
- and
- (d) wearing the lens without neutralizing residual peroxide.
5 more elements
Dependencies are inferred from the claim text.