Plasma surface treatment of silicone hydrogel contact lenses

Details Plasma surface treatment of silicone hydrogel contact lenses Plasma surface treatment of silicone hydrogel contact lenses

C - Chemistry, Metallurgy

08

J

C08J 7/06 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2328898

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 50x50 micron square AFM image in which the surface is nitrogen enriched compared to the pre-plasma treated lens.

La présente invention concerne un procédé de revêtement hydrophile, optiquement clair, de la surface d'une lentille en hydrogel contenant du silicone. La surface de la lentille est soumise à un procédé consistant à la traiter au plasma, à l'hydrater et à la stériliser par la chaleur, de façon à obtenir un film contenant du silicate, caractérisé par un motif en mosaïque de plaques en relief, entourées de fissures que l'on observe dans une image de microscope à forces atomiques (AFM), laquelle surface est enrichie à l'azote par rapport à la lentille traitée au pré-plasma.

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