Laser hair removal photon hair removal real effect
激 光 脱 毛 光 子 脱 毛 真 实 效 果Robert M Adrian
Author: Georgetown University laser surgery center
Robert· M ·Adrian American physicians assistant clinical professor at the Department of Internal Medicine
Georgetown University of laser surgery center ( District of Columbia )
The laser hair removal technology has been the subject of public altitude. Unfortunately, the laser technology, the safety and effectiveness of clinical research has lagged behind the world wide application of laser technology. The traditional methods of hair removal, such as shaving, waxing and pulling electric erosion has certain clinical limitations and side effects, so that laser hair removal technique was accepted by the people, whether concerning the safety and effectiveness of little information to the clinical.
Now on laser hair removal, the chromophore is hair melanin. In addition, the inner root sheath and outer root sheath also contains a certain amount of melanin, but relatively little hairy stem. The theoretical and clinical treatment, is transmitted to the hair dry laser energy can be used as heat sink, heat energy transfer to the pool will hair follicle and hair follicle tissue surrounded by four, from hair follicle stem heat ultimate injury. For the number of hair follicle damage is required in order to achieve permanent hair reduction effect. However many factors in the hair follicles to laser response plays a role, but research shows that wavelength, energy density, pulse width and spot is the clinical effect of the main factors.
Ruby ( 694nm ), Alexandrite ( 755nm ) and semiconductor ( 800nm ) in most laser hair removal system is the main use of wavelength. The three system pulse width from 1ms to 60ms range. Although the energy density of laser energy density in different, but 3040J/cm2 above can achieve the purpose of therapy. In the past four years, we have used 5 different laser hair removal system. Clinical studies show that pulse width is longer the better, and as the blistering and pigmentary disorders and other side effects are less.
Laser hair removal treatment to the desired pulse width of 10 55ms, than epidermal thermal relaxation time is long, and a hair follicle stem and thermal relaxation time is short, the pulse width to a certain extent cute support epidermal, treatment available for high energy density. Short pulse laser more easily damaged skin such as blistering and crusted, in addition, short pulse laser may be associated with pigmentation defects associated with a high incidence of, which is composed of hair follicles and epidermis melanin non selective injury caused by. Clinical study of said pulse width grows security is higher, for dark skin patients, the use of larger energy density is postoperative fewer side effects.
In any system, the main consideration is the energy density. In fact, a suitable wavelength and the ideal pulse width is of sufficient energy to make the hair follicle destruction launch rather than transient hair loss. Laser hair removal treatment goal is to destroy the hair follicles but not the hair dry heating caused a transient hair loss. Without enough energy to the hair follicle and hair follicles surrounded by conduction tissue in a case, the hair shaft to the destruction caused by transient hair loss, mainly found in the low-energy scanning laser, which may explain the use of low-energy laser hair removal system appeared after treatment with hair rapid regeneration of reason.
With regard to the clinical results achieved and destroyed hair follicles of the exact region of controversial. Histological study of hair follicle and hair follicles surrounded by said, tissue coagulation changes and clinical effect size ( Figure 1, normal hair follicles, arrow indicates the outer root sheath. Figure 2, anagen, using the energy density of 35J/cm2 LightSheer semiconductor laser treatment immediately after the solidification of change ). If the hair follicle was not completely destroyed, the clinical effect is poor.
In 1998, total company developed a new type of 800nm pulsed high power diode laser hair removal system. After a water contact sapphire cooling head laser emission to the skin. LightSheer semiconductor laser by gallium arsenic semiconductor array, with a water contact sapphire cooling head, treatment when it comes into contact with the skin. 9m2 spot energy density can reach 60J/cm2, pulse width selection 530ms. There are two kinds of pulse width model: 30ms and optical pulse ( optical pulse width on the energy density of the 1/2, such as energy density is 40J/cm2, width of 20ms ). Pulse frequency is 1Hz. Clinical studies show that this system can transmit high power density of laser, and good curative effect, little side effect.
And PhotoGenicaLPIRTM emerald Aquamarine system and ruby EpiLaserTM system, LightSheerTM system with semiconductor with sapphire cooling head, thereby to IV type V cutaneous emitting a high energy density of laser ( Figure 3A and 3B, V type of skin of neck of patients before treatment and again after treatment in February, energy density 25J/cm2, pulse width 30ms ).
Clinical observation of [ ]
Clinical laser treatment, the main consideration of the patient's comfort. Most of the patients complained of laser can cause mild to moderate discomfort, on 60% patients using a locally advanced static test recorder, the patient's treatment plan.
According to the patients, nurses and doctors each respect circumstance that effect, most of the patients after 2 or 3 months after treatment to obtain a good long term results (4 - 7. Figure 4A and 4B, skin type II patient axillary treatment before and after the three treatment on August, energy density 40J/cm2, pulse width 20ms. Figure 5A and 5B, III type of skin of neck of patients before treatment and again after treatment in March, energy density 35J/cm2, pulse width 30ms. Figure 6A and 6B, type III skin of patients with facial treatment before and after the three treatment on May, energy density 35J/cm2, pulse width 30ms. Figure 7A and 7B, skin type II patient Bikini department before treatment and after treatment in March four, the energy density of 40J/cm2, pulse width 30ms ). The postoperative side effects have skin crusting and transient hyperpigmentation is insufficient, in dark skin patients. In the past 10 months, more than 125 patients received 1 or 2 of this treatment, treatment of parts of the body including the face, neck, armpits, lip, back and Bikini of the Department of. At the time of treatment and follow-up after 1 weeks in January. Hair regeneration was again 1-3 month treatment, treatment, more than 90% patients and 70% patients respectively 2 and 3 treatment.
The research results after 2 month treatment even after the eradication rate 60%, light skin deep, patient effect is good, but the skin type V patients after treatment can be achieved certain effect.
In 25 patients on long-term follow-up found that after 6 months of treatment the eradication rate of 60%, the side effects of erythema and edema, typically lasting 12 to 24 hours, crusting and blistering occasionally, any treatment site were destroyed or scar skin structure.
According to the use of ruby and emerald jade laser system to obtain clinical, histological aspects of information and experience with other laser system, we found that the clinical application of contrast, LightSheer semiconductor laser system is more effective, but, due to having a contact type cooling performance, it can be dark skin emitting a high energy density of laser, this expanded treatment of patients range ( table I ). Although other laser systems can also be used for dark skin, but LightSheer semiconductor laser system having to dark skin emitting a high energy density laser 's unique properties. Whether we are on this aspect of the familiar is also limited, our clinical and histological studies will confirm LightSheer semiconductor laser system for long-term hair reduction to provide a safe, comfortable method.
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