The principle of hair removal equipment

Laser hair removal, an instrument that uses laser as hair removal energy is an important branch of hair removal instruments. Laser hair removal is based on the principle of selective photothermodynamics. The energy of the laser wavelength can pass through the skin surface to the root of the hair follicle, and then the light in the hair follicle will be absorbed and converted into heat energy that destroys the hair follicle tissue, so that the hair in the growing period will be burned out and will die. The laser will not damage the surrounding tissue while acting on the hair follicle, and it is safer under the premise of regular operation.

Equipment type

(1) Long-pulse alexandrite laser: The wavelength is 755nm, which is the most widely used laser hair removal equipment in clinical practice. The selectivity for skin color is relatively low, and the adverse reactions are mild. The erythema and papules that appear after surgery can be relieved by cold compresses. It is a treatment device with high safety factor for hair removal treatment.

(2) Semiconductor laser: The semiconductor laser hair removal machine is one of the most clinically used laser hair removal systems, with a wavelength of 800nm or 810nm. In terms of wavelength, hair follicle melanin has relatively strong light absorption in this band, which can effectively destroy hair follicles; epidermal melanin absorbs less energy from semiconductor lasers, so it has advantages in hair removal treatment for dark skin.

(3) Intense Pulsed Light (IPL): It is a non-continuous light source with multiple wavelength combinations. Because it is a wavelength, its selectivity is less than that of lasers, and it is easy to cause pigmentation or loss. However, the degree of pain during treatment is relatively small, and the operation is fast and convenient due to the large spot size, and the depth of action can be adjusted through the selection of optical filters, so the treatment cost is low.

(4) Ruby laser: The wavelength is 694nm, which is the shortest wavelength in clinical hair removal lasers. The laser energy is easily absorbed by melanin in the epidermis, resulting in relatively many adverse reactions, so it is most suitable for patients with dark hair and fair skin.

(5) Nd:YAG laser with long pulse width has been proved to have obvious hair removal effect, especially for thick black hair. In addition to edema and pain during treatment, the incidence of other adverse reactions such as pigment changes is very low, especially suitable for patients with dark skin.

(6) E-light technology: E-light adopts the synergistic effect of electric energy and light energy. The heat energy of electric energy is concentrated on the hair follicle and dermal papilla, and the heat energy of light energy is concentrated on the hair shaft, so that both the hair shaft and the hair follicle are destroyed to achieve hair removal Effect.