Corneal onlays

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/14 (2006.01) A61L 27/50 (2006.01)

Patent

CA 2174967

Corneal onlays for use in surgical implantation into or onto the cornea of a mammal are described. The corneal onlays according to the invention have am optical axis region with optical characteristics which provide visual acuity therethrough and are comprised of a non-biodegradable non-hydrogel ocularly biocompatible material, characterized in that the onlay has a porosity sufficient to allow passage therethrough of tissue fluid components having a molecular weight greater than 10,000 daltons so as to provide for a flux of tissue fluid between cells anterior of the implanted onlay and cells posterior thereof. The porosity of the optical axis region is such that it allows the flux of tissue fluid components whilst excluding ingrowth of ocular tissue. The onlay is further characterized by being adapted for epithelial recolonization. Also described are methods for correcting the optical property of an eye or altering the appearance thereof which comprises surgically implanting into or onto the cornea a corneal onlay as described above.

L'invention a pour objet des implants de cornée, greffés par voie chirurgicale dans ou sur la cornée d'un mammifère. Lesdits implants présentent une zone d'axe visuel, dotée de caractéristiques optiques assurant l'acuité visuelle. Ils comportent un matériau biocompatible sur le plan oculaire, sans hydrogel, non biodégradable, caractérisé par le fait que l'implant possède une porosité suffisante pour permettre le passage des composants fluides du tissu d'un poids moléculaire supérieur à 10000 daltons et pour assurer ainsi la circulation des fluides du tissu entre les cellules situées avant et après l'implant. La porosité de la zone de l'axe visuel permet la circulation des composants fluides du tissu mais exclut toute croissance du tissu oculaire. L'implant se caractérise en outre par le fait qu'il est adapté à la recolonisation épithéliale. L'invention a également pour objet des procédés de correction optique d'un oeil ou de modification de l'apparence de celui-ci consistant à greffer par voie chirurgicale un implant de cornée dans ou sur la cornée.

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