Method and device for sculpturing laser beams

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/00 (2006.01) A61F 9/01 (2006.01) A61N 5/06 (2006.01) A61F 9/008 (2006.01)

Patent

CA 2269200

This invention is a method for sculpturing a laser beam (13) in a predetermined pattern using a device (17) between the laser source (11) and the target (23). The method comprises a series of sequential steps in which at least two regions of the cornea (177) are each exposed to increasingly larger portions of the laser beam (13). In the preferred embodiment, two pairs of complimentary regions of the cornea (177) will be sequentially exposed to laser radiation. In each such region, a first part will be exposed to a substantially segmental portion of the beam (13), and then at least another larger substantially segmental portion of the beam (13) in which the larger segmental portion, includes the smaller segmental portion. In the preferred embodiment, the target (23) is the human eye, and the predetermined pattern is intended to shape the eye to treat it for astigmatism, myopia, or hyperopia.

L'invention concerne un procédé destiné à sculpter un faisceau laser (13) selon un motif préétabli, au moyen d'un dispositif (17) situé entre la source laser (11) et la cible (23). Ce procédé comprend une série d'étapes séquentielles, dans lesquelles au moins deux zones de la cornée (177) sont exposées chacune à des parties progressivement plus grandes du faisceau laser (13). Dans le mode de réalisation préféré, deux paires de zones complémentaires de la cornée (177) sont exposées de façon séquentielle à un rayonnement laser. Dans chacune de ces zones, une première partie est exposée à une partie sensiblement segmentaire du faisceau (13), puis à au moins une autre partie, plus grande, sensiblement segmentaire du faisceau, la partie segmentaire la plus grande incluant la partie segmentaire la plus petite. Dans le mode de réalisation préféré, la cible (23) est l'oeil humain, et le motif préétabli est destiné à conférer une forme à l'oeil afin de traiter un astigmatisme, une myopie ou une hypermétropie.

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