Lenses from polymeric derivatives of acrylic and methacrylic acids
US5158832A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1989 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Dec 7, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A lens made from a non-hydrophilic acrylate or methacrylate polymer or copolymer for application in an aqueous medium inside a human eye or on its surface, i.e., an intraocular or contact lens, is provided wherein the originally non-hydrophilic surface layer has been hydrophilized by a partial hydrolysis or sulfonation in such a way that a gradient of swelling results such that the swelling decreases from a maximum on the very surface to a minimum in the non-swelling core, which is unaffected by hydrophilization. Accordingly, light reflexes are eliminated or at least substantially reduced as well as the tendency of the surface to grow cells, the irritation of neighboring living tissues, and the formation of pressure necroses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.