Alexandrite laser system for treatment of dermatological...

A - Human Necessities – 61 – N

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A61N 5/06 (2006.01) A61B 18/20 (2006.01) H01S 3/092 (2006.01) A61B 17/00 (2006.01) A61B 17/22 (2006.01) H01S 3/08 (2006.01) H01S 3/16 (2006.01)

Patent

CA 2251555

A long pulse alexandrite laser for treating dermatological specimens is disclosed. The use of alexandrite allows operation in the near-infrared, specifically in a 50 nm range surrounding 755. Infrared in this range allows good penetration while still achieving an acceptable ratio of hemoglobin to melanin absorption. In operation, the laser generates pulses having a durations between 5 and 100 msec and fluences between 10 and 50 J/cm2. A light delivery system is provided that transmits the laser light output pulse to dermatological targets of a patient. The invention is also directed to a hair removal system. Here, it is desirable to use an index-matching application on the skin sections to be treated, and a visual indicator is thermo- or photo- responsive or otherwise responsive to the laser light pulse to generate a visible change. This provides the operator with a record of those parts of the skin that have already been treated. Finally, the invention is directed to a combined sclerotherapy and light treatment method and kit for unwanted veins. Substantially increased success, in the range of 90-100 % has been achieved by implementing a dwell time of between 12 hours and 6 months between the light- based therapy and the sclerotherapy. Preferably, the light-based therapy is performed before the sclerotherapy. Success can be achieved by performing the sclerotherapy followed by the light-based therapy after the dwell time, however.

On décrit un laser à alexandrite, à impulsions longues, destiné au traitement d'échantillons dermatologiques. L'utilisation d'alexandrite permet un fonctionnement du laser dans le proche infrarouge, notamment dans une gamme comprise entre 50 nm et environ 755. L'infrarouge de cette gamme permet une bonne pénétration tout en effectuant un rapport acceptable d'absorption hémoglobine/mélanine. Lors de son fonctionnement, ce laser produit des impulsions dont la durée est comprise entre 5 et 100 millisecondes et des fluences de l'ordre de 10 à 50 J/cm?2¿. Un système d'apport de lumière transmet l'impulsion de sortie lumineuse du laser à des zones dermatologiques cibles d'un patient. L'invention concerne également un système d'épilation, dans lequel il est souhaitable d'utiliser, sur des sections de la peau à traiter, un système correspondant à un index, de même qu'un indicateur visuel thermosensible ou photosensible ou autrement sensible à l'impulsion lumineuse du laser, afin de produire un changement visible, ce qui permet à l'opérateur d'avoir un état de celles des sections de la peau qui ont déjà été traitées. Finalement, l'invention concerne un procédé et nécessaire combinés de sclérothérapie et de photothérapie de veines non désirées. La réussite du traitement peut s'obtenir en effectuant une sclérothérapie que l'on fait suivre, après un certain délai, d'une photothérapie.

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