Plasma surface treatment of silicone hydrogel contact lenses
US6193369A · kind A · utility
134Cited by
14References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1999 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Apr 21, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2383/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides an optically clear, hydrophilic coating upon the surface of a silicone hydrogel lens by subjecting the surface of the lens to a process comprising plasma treatment, hydration, and heat sterilization that is controlled to result in a silicate-containing film having a mosaic pattern of projecting plates surrounded by fissures when viewing a 50.times.50 micron square AFM image, wherein the peak-to-valley distances of the fissures are on average between about 100 and 500 angstroms and the plate coverage is on average between about 40% to 99%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.