Laser treatment of telangiectasia

A - Human Necessities – 61 – N

Patent

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A61N 5/06 (2006.01) A61B 18/20 (2006.01)

Patent

CA 2198826

The present invention is a method of using a laser to coagulate blood vessels and, in particular, using wavelengths between 580-1000 nm delivered in a multiple pulse technique. The fluence required for photocoagulation and irreversible vessel injury is delivered in a sequence of pulses which allows for cumulative heating of the irradiated vessel. Each pulse utilizes a subthreshold fluence delivered at a calculated repetition rate based on the thermal relaxation time of the targeted vessels to allow for efficient heating. Using several pulses at a lower fluence than would be required if the energy were delivered in one pulse avoids the thermal shock wave which results in vessel rupture and unwanted hyperpigmentation. Lower fluences also reduce the risk of epidermal injury and unwanted scarring. This method is particularly useful in the treatment of leg telangiectasia.

L'invention concerne une méthode d'utilisation du laser pour coaguler des vaisseaux sanguins et, en particulier, de longueurs d'ondes entre 580 et 1 000 nm produites par une technique d'application d'impulsions multiples. La fluence nécessaire pour la photocoagulation et des dommages irréversibles aux vaisseaux est obtenue dans une séquence d'impulsions qui permet le chauffage cumulatif du vaisseau irradié. Chaque impulsion utilise une fluence infraliminaire obtenue à un taux de répétition calculé basé sur le temps de relaxation thermique des vaisseaux visés afin de permettre un chauffage efficace. Le fait d'utiliser plusieurs impulsions à une fluence inférieure à ce qu'il serait nécessaire si l'énergie était livrée dans une impulsion permet d'éviter l'onde de choc thermique qui entraîne la rupture des vaisseaux et une hyperpigmentation non souhaitée. Des fluences inférieures réduisent également le risque de blessures épidermiques et de cicatrices indésirables. Cette méthode est particulièrement utile pour traiter la télangiectasie dans les jambes.

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