Coating of polymers

A - Human Necessities – 61 – L

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A61L 31/12 (2006.01) A61F 2/16 (2006.01) C08J 7/04 (2006.01) G02B 1/00 (2006.01) G02B 1/04 (2006.01) G02B 1/10 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2314078

Biomedical devices, such as ophthalmic lenses, and methods of making such devices having a surface coating including at least one polyionic layer. A preferred method involves spray coating a polycationic material onto a core lens, rinsing and drying the lens, followed by spray coating a polyanionic material, rinsing and drying. The coating process may be applied a plurality of times to achieve a multi-layer coating on the lens surface. A particularly preferred embodiment is a contact lens comprising a highly oxygen permeable hydrophobic core coated with a 5 to 20 bilayers of hydrophilic polyionic materials.

L'invention concerne des dispositifs biomédicaux, tels que des lentilles ophtalmiques, et des procédés de fabrication desdits dispositifs comprenant un revêtement de surface constitué d'au moins une couche polyionique. Un procédé préféré de l'invention consiste à appliquer par pulvérisation un matériau polycationique sur un coeur de lentille, à rincer et à faire sécher cette dernière, puis à appliquer par pulvérisation un matériau polyanionique, à rincer et à faire sécher. Le procédé d'enduction peut être répété plusieurs fois, de sorte qu'un revêtement multicouche soit formé à la surface de la lentille. Dans un mode de réalisation idéal, la lentille de contact comprend un coeur hydrophobe et hautement perméable à l'oxygène, revêtu de 5 à 20 bicouches de matériaux polyioniques hydrophiles.

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