Apparatus for controlling laser penetration depth

H - Electricity – 01 – S

Patent

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H01S 3/10 (2006.01) A61B 18/12 (2006.01) A61B 18/20 (2006.01) A61N 5/06 (2006.01) A61B 18/22 (2006.01)

Patent

CA 2428001

The invention features systems and tools for controlling the optical penetration depth (OPD) of laser energy, e.g., when delivering laser energy to target tissue in a patient. The systems and tools control the OPD by controlling the incident angle at which the laser energy (364) is delivered to the target area of the patient. Embodiments of the invention include an optical coupler (368) that permits a user to vary the incident angle and thereby selectably control the OPD of incident laser energy (364). Fabricating the optical coupler (368) to have a refractive index greater than that of the target tissue can enhance the range of selectable OPDs. The laser energy (364), which is delivered to the desired depth, can cause alteration of the target tissue by, e.g., heating, ablation, and/or photochemical reaction.

L'invention concerne des systèmes et des outils servant à commander la profondeur de pénétration optique de l'énergie laser, p. ex. lors de l'émission d'énergie laser à un tissu cible d'un patient. Les systèmes et les outils commandent la profondeur de pénétration optique (OPD) par la commande de l'angle d'incidence auquel l'énergie laser est émise à la zone cible du patient. Dans certains modes de réalisation de la présente invention, un coupleur optique permet à un utilisateur de modifier l'angle d'incidence et, ainsi, de commander sélectivement l'OPD de l'énergie laser incidente. La fabrication du coupleur optique afin de bénéficier d'un indice de réfraction supérieur à celui du tissu cible peut améliorer la plage des OPD pouvant être sélectionnées. L'énergie laser, qui est émise à la profondeur souhaitée, peut entraîner une modification du tissu cible par chauffage, ablation et/ou réaction photochimique, par exemple.

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