Hair Removal With Lasers
Laser hair removal is hair removal by destroying hair follicles play a role in melanin within the hair follicle growth phase in most of the absorption of laser light sent the strongest, the best role of laser hair removal equipment goals. The more melanin a clear hit the higher the rate of destruction of hair follicles greater.
Everyone has a yearning for a smooth skin, so all kinds of cosmetic products, such as crossing the river over the crucian carp, dizzying, but trapped in the lip hair, hand hair, leg hair length is also where many people have, plus on the armpit hair, pubic hair, etc., in order to fast, quick removal of these small hairy, the traditional method of hair removal of the clips from the most simple removal of the shaving method, patch, beeswax hair removal, chemical reagents hair removal, hair removal and other electro-acupuncture, there are people who at a try. Their role is only temporary, common drawback is that regeneration of hair very quickly.
Electrolysis (electriolysis) and thermal dissolution method (thermolysis)
Although the effective destruction of hair follicles, but the operation cumbersome and time-consuming, there is low efficiency, efficacy is low, significant pain and possible shortcomings of the remaining scar. To be effective, convenient and safe removal of unwanted hair surface, based on principles of selective photothermolysis, has designed a variety of laser systems, and intense pulsed light source system that allows people to accept a large area hair removal treatment significantly reduced discomfort, and to scar formation and reduce the incidence of other complications to a minimum. The use of modern optical technology has been able to achieve permanent hair removal reduction purposes.
As early as 60 years, Goldman first described ruby laser on the hair follicle damaging effects of melanin, but not for clinical, 80 years Ohshiro described ruby laser treatment of nevus after hair loss, but skin, and causing serious injury. In 1993, Harvard University Medical optics laboratory Wellman started using ruby laser hair removal research, followed by ruby laser, Nd: YAG laser hair removal and so on successively for clinical treatment, but their parameters design also not very satisfactory. Wellman Medical optics laboratory in 1997 to start using a new generation of laser hair removal machine-LightSheer diode laser hair removal instrument for clinical treatment, achieved remarkable efficacy. Later, a new intense pulsed light hair removal treatment systems began to be used, from optical hair removal technology has been basically mature.
1. Principle of Laser Hair Removal
The principle of laser hair removal is still based on the theory of selective photothermolysis. Hair follicle and hair shaft are rich in melanin, melanin found in hair cells in the matrix between the ball and also able to shift the structure of hair shaft (such as the medulla, cortex and hair cuticle). Melanin as a target of laser can precisely and selectively target hair removal treatment. Melanin in the absorption of laser energy, the temperatures soar, leading organizations around the hair follicle damage, hair removal will be.
According to theory of selective photothermolysis, simply choose the appropriate wavelength, pulse width and energy density, the laser will be able to accurately destroy the hair follicle without causing damage to adjacent tissues. In order to achieve efficacy, it is clear the ball and his hair above the bulge (in the sebaceous hair follicle openings and Li Mao muscle attachment between the hair follicle outer root sheath, where is the site where the hair follicle stem cells) in melanocytes must be subjected to light treatment .
① As the deeper parts of hair balls, decided to use a longer wavelength, light penetrates deeper treatment. On the other hand, if the wavelength is too short, epidermal melanin melanin with the hair follicle absorbs more competitive energy, and thus easy to cause skin damage. Therefore, in ensuring a better absorption of light waves on the black has long been known, while the wavelength of laser hair removal in order to better 695-1064nm.
② To achieve high efficiency of the hair follicle damage in a solution obviously is to increase the laser irradiation time. In theory, through the longer laser pulse, close to the thermal relaxation time of hair follicles can improve efficacy, the longer pulse width, the micro-structures such as epidermal melanosome smaller the possibility of damage, while the relatively large structure of any color hair follicles, melanin within which the more vulnerable to injury. The diameter of the hair follicle is about 200-300μm, hair follicles of the thermal relaxation time of 40-100ms. Therefore, the ideal laser pulse width should be tens of milliseconds to 100 milliseconds. Recent studies have found that for patients with dark skin, the laser pulse-width of more than 100ms, not only have a better efficacy and fewer side effects.
Hair growth cycle and hair removal treatment of the relationship:
① because of laser catagen, the hair had no obvious effect quiescent period, and only after the growing season such as the hair into the laser to work, so many times of laser hair removal treatment, the effect can be significant.
② If a part of the small proportion of hair in the growing season, then the number of treatment should be increased. On the contrary the treatment frequency can be reduced.
③ Based on different parts have different hair growth cycle, there are differences between each treatment interval. As head of hair has a relatively short period of resting, so interval of time can be as short as l month; trunk and limbs resting relatively long hair, so that treatment is appropriate intervals to February or so.
④ depth of the hair follicle due to site-specific, such as deep deep shall be in the longer wavelength of the laser treatment, whereas shorter wavelengths can be used, such as shallow depth of the laser treatment. ⑤ If a part of the hair follicle density is too high, then the treatment should be appropriate reduction in laser energy.
2. Laser hair removal treatment
Laser Hair Removal indications and contraindications: Laser hair removal for all parts of dark and light-colored hair, but the white hair is invalid.
The following is the relative contraindications of laser hair removal:
① there is a history of keloids;
② in the treatment of local infection or a history of herpes simplex infection;
③ in 6 weeks, have used other means (eg, wax off) hair removal patients;
④ of hydroquinone or other bleaching agent allergy;
⑤ In the 6 months have been used Lsotretinoin (13 - cis-retinoic acid) history.
Preoperative preparation: For darker skin type Ⅲ - Ⅴ skin type patients before surgery to avoid sunlight as much as possible, it is best to use sunscreen 4-6 weeks, there is pigmentation tendencies while hydroquinone was added to prevent drugs . In addition, the treatment area of skin preparation before surgery, thoroughly scrape the hair, and its role are:
① treatment area can reduce the absorption of part of the hair due to discomfort caused by laser-coking occurs
② can reduce hair burnt odor emitted.
Laser Beauty Center, Beauty Hospital, the Deputy Chief Physician Wang Zhaohui said that if an improper manner, be careful to pay the price for the beautiful and oh!
Hairy physique does not mean hirsutism
Seeing in the summer to go to, and on the second year of the endless snow became upset because she felt the old legs, arm hairs on a particularly large number, while the same bedroom the girls are particularly smooth white skin. Few days before the mall, I saw that there are counters selling epilator, she ponder the'm not buying one should try to come back.
Experts suggest: In fact, like light snow this girl a few, they are often demanding a beautiful, normal body hair in their eyes have become redundant. True hirsutism generally refers to some parts of the excessive hair growth, the distribution of the form of a male tendency. From the skin health point of view, WANG Zhao-hui does not advocate hair removal doctors, except as a last resort, or not easily shed.
Hair Removal should proceed in advance
Many people think that hair removal is a matter for the summer, so always have to wait until the heat wave was expected to hair removal, especially those who choose a laser hair removal clients, often hair removal is over, summer to an end.
Experts suggest: Laser hair removal is not suitable for everyone, and it is more suitable for light hair, dark skin people, the treatment range of locking in the "dark color", if you color depth, the laser will be damaged, or white spots caused by skin pigmentation spots, followed by often takes several months to gradually recover.
Therefore, if you want to display in the summer, enjoy the beautiful, should now proceed to begin preparing. In addition, the hair removal treatment should be part of the week before and after treatment two weeks exposure to sunlight, hair removal site should not be done in the treatment of two weeks before the feathers plucked.
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