Laser delivery system and method with diffractive optic beam...

H - Electricity – 01 – S

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H01S 3/08 (2006.01) A61F 9/01 (2006.01) B23K 26/06 (2006.01) G02B 27/09 (2006.01) H01S 3/00 (2006.01) A61B 18/20 (2006.01)

Patent

CA 2319122

A laser delivery system and method incorporate a diffractive optic beam integrator. The diffractive optic apparatus for modifying the spatial intensity distribution of an excimer laser beam (10) to generate a spatially integrated beam comprises a diffractive optic diffuser (12) and a converging lens (22). The diffractive optic diffuser (12) includes a diffractive grating pattern etched in a transparent medium for transforming the intensity profile of the excimer laser beam into a generally circular, substantially uniform spatial intensity distribution at a spatial integration plane. A variable aperture positioned about the spatial integration plane selectively passes the spatially integrated beam to an imaging lens. The imaging lens forms an image of the passed beam about a surface of a tissue to be ablated. A scanning element under computer control scans the imaged beam about the surface.

L'invention porte sur un procédé et un système à décharge par laser, système comprenant un intégrateur de faisceaux optiques à diffraction. L'appareil optique à diffraction, permettant de modifier la répartition spatiale de l'intensité d'un faisceau (10) laser excimère de façon à générer un faisceau intégré dans l'espace, comprend un diffuseur (12) optique à diffraction et une lentille (22) convergente. Le diffuseur (12) optique à diffraction comprend un motif de grille à diffraction gravé dans un support transparent de façon à transformer le profil de l'intensité du faisceau laser excimère en une répartition spatiale, sensiblement uniforme, circulaire, de l'intensité au niveau d'un plan d'intégration spatiale. Une ouverture variable positionnée autour du plan d'intégration spatiale fait passer sélectivement le faisceau intégré dans l'espace dans une lentille d'imagerie. La lentille d'imagerie génère une image de ce faisceau autour de la surface d'un tissu à éliminer. Un élément de balayage sous commande informatique balaye le faisceau transformé en image autour de la surface.

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