Method for modifying the surface of biomedical articles

G - Physics – 02 – B

Patent

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Details

G02B 1/04 (2006.01) A61L 27/34 (2006.01) A61L 27/50 (2006.01)

Patent

CA 2467092

The invention relates to a process for coating a material surface, comrising the steps of: a) providing an inorganic or organic bulk material; b) providing one or more polyionic materials at least one of them comprising covalently bound initiator moieties for radical polymerization; c) applying the polyionic material of step (b) to the bulk material of step (a), thereby forming a hydrophilic layer on the bulk material surface; and d) graft polymerizing a hydrophilic monomer or macromonomer onto said polyionic material. The coated articles that are obtainable by the process of the invention have desirable characteristics regarding adherence to the substrate, durability, hydrophilicity, wettability, biocompatibility and permeability and are thus useful for the manufacture of biomedical articles such as ophthalmic devices.

L'invention concerne un procédé de revêtement d'une surface de matériau, comprenant les étapes consistant: a) à obtenir un matériau en vrac inorganique ou organique, b) à obtenir au moins un matériau polyionique, au moins un de ces matériaux contenant des fractions d'initiateur à liaison covalente pour polymérisation par radicaux, c) à appliquer le matériau polyionique obtenu à l'étape (b) sur le matériau en vrac obtenu à l'étape (a), formant ainsi une couche hydrophile sur la surface du matériau en vrac, et d) à polymériser par greffage un monomère ou un macromonomère hydrophiles sur ce matériau polyionique. Les articles revêtus qui peuvent être obtenus par le procédé de cette invention possèdent des caractéristiques désirables en ce qui concerne leur adhérence au substrat, leur durabilité, leur caractère hydrophile, leur mouillabilité, leur biocompatibilité et leur perméabilité et sont donc utiles dans la fabrication d'articles biomédicaux tels que des dispositifs ophtalmiques.

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