Viscoelastic material for ophthalmic surgery
Patent 4965253 Issued on October 23, 1990. Estimated Expiration Date: 
October 23, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 23, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOphthalmic formulation Mixed xanthan gum and locust beam gum therapeutic compositions Ultrapure hyaluronic acid and the use thereof Ophthalmological procedures Protection of human and animal cells subject to exposure to trauma Gelled aqueous compositions Patent #: 4604217 InventorsAssigneeApplicationNo. 108068 filed on 10/14/1987US Classes:424/78.36, Nitrogen heterocycle514/54, Polysaccharide514/912, OPHTHALMIC514/913, Glaucoma514/915, Wetting agent604/28, Method604/294Means for treating eye or surface of ocular cavityExaminersPrimary: Griffin, Ronald W.Assistant: White, Everett Attorney, Agent or FirmForeign Patent References
International ClassA61K 031/00AbstractAn ophthalmic surgical procedure wherein the anterior or posterior chamber of the eye is filled with viscoelastic space-filling and ocular tissue protective surgical material, the improvement comprising the utilization therein of a composition particularly adapted for use as an ophthalmic viscoelastic surgical material in the anterior or posterior chamber of the eye consisting of an aqueous solution containing from about 1.5% to about 25%, by weight, of a physiologically acceptable, water-soluble polyvinylpyrrolidone polymer or polyvinylpyrrolidone copolymer, having a molecular weight greater than 500,000, said aqueous solution having a viscosity greater than about 5,000 centipoises, measured at 25° C. using a Brookfield viscometer. | |
