Method and system for ablating surfaces with partially...

A - Human Necessities – 61 – B

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A61B 18/18 (2006.01) A61F 9/01 (2006.01) A61B 18/20 (2006.01)

Patent

CA 2368228

This invention is a technique for laser sculpting a predetermined shape on an exposed corneal surface (6) by ablating a sequence of consistently curved craters (16a, 16b, 16c, 16d) with individual pulses of a laser beam (10). An initial laser beam energy pattern (14) is shaped by a laser beam shaping element (22) to make a consistently curved laser beam (12) energy pattern. The consistently curved laser beam (12) ablates a consistently curved crater (16) in the surface (6) with a single pulse of the laser beam (10). A computer (26) controls the position of the laser beam (10), and scans the laser beam over the surface (6) to sculpt the predetermined shape in an ablation zone (18) on the exposed surface. A sequence of partially overlapping craters (16a, 16b, 16c, 16d) are distributed over the ablation zone (18). In some embodiments diffractive optics (50) are used as a beam shaping element (33). In additional embodiments, the consistently curved crater (16) is a uniformly curved spherical crater.

L'invention se rapporte à une technique de modelage au laser d'une forme préétablie sur une surface cornéenne exposée (6), qui consiste à procéder à l'ablation d'une série de cratères (16a, 16b, 16c, 16d) présentant une courbure uniforme, au moyen d'impulsions individuelles d'un faisceau laser (10). Un motif initial d'énergie (14) du faisceau laser est mis en forme par un élément de façonnage (22) de faisceau laser aux fins d'obtention d'un motif d'énergie de faisceau laser (12) à courbure cohérente. Ledit faisceau laser (12) à courbure cohérente produit l'ablation d'un cratère à courbure cohérente (16) sur la surface (6) au moyen d'une unique impulsion du faisceau laser (10). Un ordinateur (26) commande la position du faisceau laser (10) et balaye celui-ci sur la surface (6) de manière à modeler la forme préétablie dans la zone d'ablation (18) sur la surface exposée. Plusieurs cratères (16a, 16b, 16c, 16d) se recouvrant partiellement sont répartis sur la zone d'ablation (18). Dans certaines réalisations, des organes optiques de diffraction (50) sont utilisés en tant qu'élément de façonnage (33) du faisceau. Dans d'autres réalisations, le cratère (16) à courbure cohérente est un cratère sphérique à courbure uniforme.

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