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Application and effect of new hair removal laser

Laser hair removal has attracted much attention because of its convenience, relatively non-invasive to other surrounding skin tissues and less adverse reactions. Since it has been widely used in clinic, a large number of research data show that the lasting hair removal effect is closely related to the color of hair and the number of treatments. However, the ideal parameters, methods, safety and effectiveness of laser therapy need to be further studied. Here are some applications and effects of new hair removal lasers.

1、 Long pulse ruby laser (LP ruby, 694 nm)

It is applicable to individuals with light skin color (firzpatrick I-I and type I). It has specificity in destroying hair follicles, but ruby laser transmits pulses slowly, so it is not practical in treating large areas. Gault et al. A conducted an 18 month long pulse ruby laser treatment study on 116 patients with poor previous efficacy. The average follow-up time was 23.25 weeks. After an average of 1.92 treatments, the hair density decreased by 56.400. There was statistically significant difference before and after treatment (paired t-test PG 0.00001) O somcner et al. 9 reported the efficacy of long pulse ruby laser in 43 patients with firzpatrick I ~n type. Pulse width 950 l}s, spot size 4 mm, average flow 48 J /ctri. The first point of each patient was treated only once, and the second point was treated 4 times a month. After one treatment, the hair count decreased to 4600 before treatment, but increased to 8000 at the third month, and increased to 66000 at the sixth month. After three treatments, the hair count decreased to 2900 before treatment. At the same point, the hair count increased to 4400 3 months after 4 treatments. This therapy is well tolerated by patients, and is easily tolerated by large flow continuous treatment. After the first treatment, 60% of the patients had mild temporary erythema and papule, 14% had water scar, and 33% had small nodule. Based on the above evidence, it is proved that long pulse ruby laser is easily tolerated. If you want to obtain continuous therapeutic effect treatment for at least 6 months, multiple treatments can increase the clinical efficacy.

2、 Long pulse alexandrite laser (LP Alexandrite, 755nm)

Compared with ruby laser, it penetrates deeper into dermis and is less likely to be absorbed by epidermal melanin. Theoretically, it is safer to use it for darker skin color. Bou second class IO studied the treatment of 58 areas of 23 patients with fir}patrick ill ~ n with long pulse alexandrite laser. Wavelength 755nm, flow rate 17 ~ 25) i}, spot size 10 mm. The patients were divided into 4 groups according to the number of treatment: group I = 4, group II = 5, group III = 6, and the treatment was successful if the hair count of wife 70 in group N was reduced by 50% and there were no side effects. The results showed that the decrease of hair count was positively correlated with the number of treatment (r=0.402, pg0.005). Side effects: pigmentation (2 cases in group n), hypopigmentation (1 case in group n), water scar (1 case in group n), folliculitis (1 case in group III and 1 case in group n). The treatment success rate of the total area was 48.300 (28; 58). The treatment success rates of each group were 2500 in group I, 760 in group ll, 5800 in group III and 150O in group n (p=0.002). Conclusion: multiple treatment can obtain higher hair reduction rate with higher incidence of side effects. Clinical application should seek a balance between the two. Xi Dan et al. Used Alexandrite long pulse laser to treat 424 patients with hairy face, trunk and limbs. The wavelength was 755 nm, the pulse width was 20 ms, the spot diameter was 7~10~ the treatment energy was 15 ~ 25 J icm{, and the treatment interval was 3 months. Results: the one-time depilation rate of axillary and limbs was about 300 o, and the two-time depilation rate was about 5500, which was energy dependent. It was found that all cases had delayed hair growth, and 55.4% of them had hair thinning without any side effects.

3、 Pulsed semiconductor laser (800 nm)

The absorption degree of this wavelength is not as good as the first two, so it is safe and effective for people with darker skin color and beard pseudofolliculitis, but there may be pigmentation or hypopigmentation. Lixueli observed the efficacy of Lightsheer semiconductor laser hair removal. Methods: 90 cases of hirsutism were treated with semiconductor laser. Wavelength 800 NTN, pulse width 5-100 MS, energy density 10-60) /ctri, routine skin preparation in the hair removal treatment area before operation. The pulse width of 100 ms and the energy of 28 ~ 35 J /cm{are suitable for treatment. Generally, the treatment starts from low energy, and the treatment interval is about 1 ~ 3 months according to the body arrest time of different parts of hair. Results: 90 patients were followed up for 12 months and achieved satisfactory results, and no one had adverse reactions such as addiction marks and chromatin deposition.

4、 Riveted aluminum garnet laser (nd: yac31064nm)

Battle et al. “Pointed out that this wavelength is a safe and effective method to treat patients with darker skin color. The expected effect can be achieved through conservative flow, long pulse width and multiple treatments.

5、 Pulsed high intensity light source system (LPL sources, 590-1200)

During treatment, after the emitted light is filtered through a series of “filters”, the selected wavelength can be suitable for the skin type and color of a specific individual. Dierickx reported that}z 12 weeks after one treatment, hair loss was about 5000-‘6000; After repeated treatment (3-4 times) and follow-up for at least 6 months, the number of hairs decreased by 750002.4. The adverse reaction of laser hair removal (1) there may be slight pain during the treatment, and local anesthesia is generally not required. (2) Erythema and follicular edema may occur immediately in the treatment area and usually subside spontaneously within a few hours. (3) One to three days after treatment, some patients may have purple pain in the treatment area. (4) after treatment, water scar and superficial skin erosion may appear in the treatment area. (5) slight temporary hypopigmentation or deepening of pigment may occur, and most of them will subside within 1 month. Generally, the longer the laser wavelength, the lower the incidence of adverse reactions, and most of them occur in patients with firzpatrick III ~v type.