Vascular lesions such as birthmarks, rosacea, spider veins, varicose veins, and telangiectasias arise from a wide range of natural and environmental sources including photodamage, genetic makeup, and the natural ageing process. They can vary in size, shape, and prevalence in a given area.
How Does It Work?
Treatment of veins depends on the principle of selective photothermolysis; the proper wavelength is applied, and the light energy is absorbed by the chromophore (in this case hemoglobin) and converted to heat which breaks up coagulated blood. Surrounding tissue remains undamaged. In many cases numerous sessions are required to maximise results.
To successfully treat veins one must carefully apply energy to break up coagulated blood but spare surrounding tissue. This can be more or less difficult depending on each patient’s individual characteristics such as skin colour or the presence of other competing chromophores. Practitioners can account for these characteristics by adjusting treatment parameters such as fluence, pulse width, and repetition rate to maximise delivery of energy (for better results) and minimise patient discomfort. Many devices are limited in their utility because the different parameters cannot be adjusted independently (if at all). Understandably, treatment of darker skin is more challenging due to the higher concentration of melanin in the skin as a competing chromophore; in those cases treatment may be too painful or cause burning.
Laser energy penetrates skin, targets blood and eliminates blood and shrinks vessel/vein