Silicone hydrogel lenses with water-rich surfaces
US10131815B2 · kind B2 · utility
1Cited by
1References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2017 |
| Grant date | Nov 20, 2018 |
| Priority date | — |
| Expiry date | Oct 12, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention is related to a hydrated silicone hydrogel contact lens having a layered structural configuration: a lower water content silicone hydrogel core (or bulk material) completely covered with a layer of a higher water content hydrogel totally or substantially free of silicone. A hydrated silicone hydrogel contact lens of the invention possesses high oxygen permeability for maintaining the corneal health and a soft, water-rich, lubricious surface for wearing comfort.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.