Noninvasive pinpoint coagulation of melanin-containing skin cells with higher concentrations of melanin (Pinpoint coagulation™ Technology) provides an effective solution to the following problems:
– Inability to effectively treat a deeply located and pigmented lesion
– Mechanical skin injury
– Risk of overheating and subsequent scarring
– Risk of postsurgical hyperpigmentation
This new method provides an opportunity to selectively coagulate melanin-containing skin cells with higher concentrations of melanin that are safe for the cells in close proximity to the treated area (thus preventing thermal or mechanical damage).
The method works via two effects. The first originates when the short (nanoseconds long) pulses hit grains of melanin. The second effect stems from heat exchange of melanin with its surroundings. Once melanin is exposed to a short laser pulse (1-10x nanoseconds) with a certain wavelength and sufficient laser power, the optical properties of melanin undergo a nonlinear transformation — sharply increasing the melanin’s light absorption.
The parameters of absorption are fixed in such a way that nearly all energy is transformed into heat and acoustic waves and cannot cause mechanical injury to the tissue. We employ trains (pulse sequences). Each train is released with its own settings. Once the first train hits a pigmented grain, the latter absorbs some energy and warms up. When the laser’s work finishes, the grain begins to cool via transferring heat by means of heat conductivity. During conduction, the outflow of heat from the grain in different directions will be inconsistent. In the areas where grains of melanin are absent, the heat from the grain will be freely transferred to nearby tissues. In some areas, a heat wave from a grain will collide with another heat wave heading in the opposite direction, leading to decelerated heat redistribution in the area. By the time the next laser pulse (and heat wave along with it) hits the zone, the temperature will be the same everywhere except for between the grains as it was at the moment immediately after the first laser pulse passes. This is the essence of pinpoint coagulation.
In summary, a hyperpigmented area suffers coagulation while its surroundings, with natural pigmentation, remain intact.