Plasma surface treatment of silicone hydrogel contact lenses
First Claim
1. A silicone hydrogel contact lens including a hydrophilic surface having a silicate-containing surface coating characterized by a mosaic pattern of projecting plates surrounded by receding fissures when viewing a 50×
- 50 micron square AFM image, wherein, as a result of a controlled manufacturing process, the average fissure depth is on average between about 100 and 500 angströ
ms and the plate coverage is on average between about 40 and 99 percent.
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Accused Products
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 50×50 micron square AFM image, wherein the peak-to-valley distances of the fissures are on average between about 100 and 500 angströms and the plate coverage is on average between about 40% to 99%.
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Citations
9 Claims
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1. A silicone hydrogel contact lens including a hydrophilic surface having a silicate-containing surface coating characterized by a mosaic pattern of projecting plates surrounded by receding fissures when viewing a 50×
- 50 micron square AFM image, wherein, as a result of a controlled manufacturing process, the average fissure depth is on average between about 100 and 500 angströ
ms and the plate coverage is on average between about 40 and 99 percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- 50 micron square AFM image, wherein, as a result of a controlled manufacturing process, the average fissure depth is on average between about 100 and 500 angströ
Specification