Laser beam ophthalmological surgery method and apparatus

A - Human Necessities – 61 – F

Patent

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Details

A61F 9/013 (2006.01) A61F 9/01 (2006.01) A61B 17/00 (2006.01) A61B 18/20 (2006.01)

Patent

CA 2237435

A laser beam ophthalmological surgery method for ablating a cornea (16) of a patient's eye includes the steps of generating a laser beam (12) and directing the generated laser beam onto a scanner (13) and scanning the laser beam (12) in a random scanning pattern with a generated random scanning pattern signal on the surface of the cornea (16) of a patient to ablate the surface of the cornea of a patient's eye. A computer (17) generates the random pattern laser beam control signal which controls the scanner (13) to scan in the random scanning pattern over the cornea (16) and includes selecting a database of non- random scanning points to scan the laser beam onto the cornea (16) of a patient's eye and then randomly selects the non-random scanning points for the random scanning of predetermined scanning points. A laser ophthalmological surgery apparatus (10) is provided which includes a laser (11) for generating a laser beam (12) along with a scanner (13) positioned for receiving the laser beam (12) and producing a predetermined scanning pattern onto the cornea (16) of an eye. A computer (17) is used to generate a random scanning pattern signal and is connected to the scanner (13) for controlling the scanner in a random overlapping scanning beam pattern over a predetermined area.

L'invention porte sur une technique chirurgicale ophtalmique d'ablation de la cornée (16) de l'oeil d'un patient par faisceau laser. Cette technique consiste à produire un faisceau laser (12), à le diriger sur un scanneur (13) et à le promener selon un mode aléatoire, avec un signal de mode aléatoire de balayage, sur la surface de la cornée (16) aux fins d'ablation. Un ordinateur (17) produit le signal de commande de faisceau laser en mode aléatoire agissant sur le scanneur (13) afin de procéder au balayage en mode aléatoire au-dessus de la cornée (16). Cet ordinateur procède au choix d'une base de données de points de balayage non aléatoires afin de promener le faisceau laser sur la cornée (16) et choisit ensuite de manière aléatoire les points de balayage en mode non aléatoire pour le balayage aléatoire de points de balayage prédéfinis. Un appareil de chirurgie ophtalmique au laser (10), selon l'invention, comporte un laser destiné à émettre un faisceau laser (12) ainsi qu'un scanneur (13) placé pour recevoir le faisceau laser (12) et produire un mode de balayage prédéfini sur la cornée (16) d'un patient. L'ordinateur (17), qui sert à produire un signal de mode aléatoire de balayage, est relié au scanneur (13) pour commander celui-ci en mode aléatoire de faisceau à balayage en superposition au-dessus d'une région prédéfinie.

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