Method and system for scanning non-overlapping patterns of...

A - Human Necessities – 61 – F

Patent

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A61F 9/01 (2006.01)

Patent

CA 2333118

A system for laser treatment of the eye comprises one or more diffractive optical elements for producing unique treatment segments within an ablation zone on the eye. The treatment segments may be annular, pie- shaped, or have other geometries or patterns selected to apply energy in a particular manner, usually in a non-overlapping manner so that energy dosages can be precisely controlled. In a first embodiment of the system, a single diffractive optical element is used and a beam expander expands or converges the beam to achieve the different treatment segments. In a second embodiment, a plurality of diffractive optical elements are used, each of which produces a single treatment segment.

L'invention porte sur un système de traitement oculaire par laser comprenant un ou plusieurs éléments optiques diffractifs permettant de produire des segments de traitement uniques dans une zone d'ablation de l'oeil. Les segments de traitement peuvent être annulaires, triangulaires ou peuvent avoir d'autres géométries ou configurations sélectionnées de façon à appliquer l'énergie d'une manière spécifique, généralement d'une manière non chevauchante de sorte que les dosages d'énergie puissent être régulés avec précision. Selon une première réalisation du système, on utilise un élément optique diffractif unique et un dilatateur de faisceau dilate et fait converger le faisceau de façon à obtenir les différents segments de traitement. Selon une seconde réalisation, on utilise une pluralité d'éléments optiques diffractifs produisant chacun un segment de traitement unique.

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