Method and apparatus for modifications of visual acuity by...

A - Human Necessities – 61 – B

Patent

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A61B 18/14 (2006.01) A61F 9/01 (2006.01) A61F 9/013 (2006.01) A61F 9/00 (2006.01)

Patent

CA 2248279

This invention is a thermo-keratoplasty system and method for locally heating and reshaping a cornea in a manner that produces a minimal regression of the corneal correction. The system includes a probe (12) that is coupled to a power source which can provide current at a predetermined power, frequency and time duration. The probe (12) has a sharp tip (36) that is inserted into the stroma of the cornea (48). The tip has an insulated stop that controls the depth of tip penetration. Current flows into the cornea through the probe tip to locally heat and denature the corneal tissue. The denatured tissue causes a subsequent shrinkage of the cornea. A pattern of denatured areas can be created around the cornea to correct the vision of the eye.

La présente invention concerne un système et un procédé de thermo-kératoplastie visant à chauffer et à remodeler localement une cornée, de façon à provoquer une régression minimale de la correction cornéenne. Ledit système comporte une sonde (12) couplée à une alimentation pouvant fournir du courant à une puissance, à une fréquence et pendant une durée prédéterminées. Ladite sonde (12) comporte une pointe (36) effilée qui est insérée dans le stroma de la cornée (48). Cette pointe a une butée isolée qui règle la profondeur de pénétration de la pointe. Le courant passe dans la cornée à travers la pointe de la sonde pour chauffer et dénaturer localement le tissu cornéen. Le tissu dénaturé provoque un rétrécissement ultérieur de la cornée. Une structure de zones dénaturées peut être créée autour de la cornée pour corriger la vision de l'oeil.

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