Picosecond laser effect
Before we know what picosecond laser is, we need to know what picosecond laser is.
"Picosecond" is a time unit, and "Picosecond laser" means that the pulse width of the laser knocks down the picosecond level, which is only11000 of the nanosecond level of the traditional Q-switched laser. The shorter the pulse width, the less light energy will spread to the surrounding tissues, and the more energy will be gathered in the target tissues, and the stronger the effect will be on the target tissues.
Picosecond laser is also a kind of laser, and its working principle is also to selectively target melanocytes and remove skin problems caused by melanin. However, while targeting melanin, the production of ACMETEA in vivo stimulates cell regeneration and promotes the production of collagen, so it also has the effects of whitening and rejuvenating skin, improving fine lines and delicate skin.
Is picosecond laser harmful to the skin?
Laser damage to skin
The damage of laser to skin is mainly determined by laser and skin. Laser output includes many parameters, mainly depending on irradiation dose, wavelength, working mode (continuous, pulsed, Q-switched, mode-locked) and mode. As far as skin is concerned, it mainly depends on skin color, water content and the thickness of stratum corneum.
1. The damage of laser wavelength to skin depends on the absorption rate of laser.
(1) wavelength >: 2 micron infrared laser, the skin absorption rate is as high as over 90%, regardless of skin color. This light is mainly thermal damage to the skin. Thermal heating, thermal erythema, hot water bubble, thermal solidification, thermal vaporization, thermal carbonization and thermal combustion will occur in turn.
(2) The absorption rate of red light and near infrared light is low, and some absorption rates are less than 10. Therefore, the damage to the skin is very small, and if these lasers are focused below the skin, they will cause adverse consequences such as skin integrity and severe subcutaneous burns, which should not be taken lightly. It is precisely because visible laser and near-infrared laser can penetrate the skin, but are absorbed by hemoglobin in the skin and subcutaneous blood vessels, so when the laser dose is large, especially green laser, it is easy to form thrombus in blood vessels, and the risk of thin cortex and rich subcutaneous blood vessels is greater.
(3) Wavelength
2. Damage of laser dose to skin
Under the condition of the same wavelength, the greater the laser dose to the same skin (that is, the laser energy density), the greater the damage to the skin. There are three damage mechanisms, the most important of which is thermal damage, the second is photochemical effect when the wavelength is less than 00mm, which can be accumulated, and the third is "thermoacoustic damage" caused by "acoustic transient phenomenon" caused by ionization and rapid energy transfer of/kloc-0 ~/kloc-0 "s pulsed laser, which is extremely rare in medical lasers.
3. The effect of skin color on laser injury
The effect of skin color on laser damage, except wavelength >; 2 00m infrared laser and wavelength: 40%, black skin is slightly higher than 10%, while white skin has higher transmittance, so the absorption rate of white skin is much lower than that of black skin. Generally speaking, at > 300nm and
4. The performance of laser damage to the skin
(1) The manifestations of laser-induced skin injury: In severe injury, the skin bulges and gradually calms down, with a brown depression in the center. Sometimes there is a small hole in the middle, which is crater-shaped. Pale around the depression, the outermost layer is brown, and the skin shrinks. After a few minutes, punctate or flaky bleeding areas gradually appeared in the brown area. After 24 hours, there are necrotic foci, scabs and induration in the center, and there are inflammatory reactions and congestion and edema around. After 4 days, congestion and edema gradually subsided, and the boundary between lesions and normal skin became clear. After 10d, the idiot began to fall off, leaving a smooth scar, and the new hair on the scar was less than that in the normal area. Tissue biopsy showed different coagulation and necrosis foci, unclear boundary of epidermal cells, nuclear shrinkage, vacuoles in some cells, ulceration of full-thickness skin with high laser energy density, and clear boundary between necrotic area and normal skin.
(2) The classification of laser-damaged skin:? When the laser energy density or power density exceeds the skin damage threshold, the skin will be damaged. According to the degree of burn, the human body will make a "healing reaction" to release ACMETEA, covering the epidermis too much and promoting epidermal regeneration. According to the degree of burn, it can be divided into three types: first-degree burn refers to mild burn, which only burns the epidermis without damaging the mucous layer. The skin may be red, painful and slightly warm, but it is not dry and does not appear blisters. Second degree burns can be divided into second degree burns and deep burns. Shallow second-degree burn means that the burn depth has reached the dermis, but some mucus layers have not been destroyed. Blisters appear locally on the skin. After the blister skin is removed, the basal part is flushed and small reticular blood vessels can be seen. The wound is moist, with obvious edema, rising temperature and severe pain. In deep second-degree burns, epidermis and mucous membrane are very important, only hair follicle roots, sweat glands and sebaceous glands are left, and there are blisters on the skin. After the blister skin is removed, the wound surface is slightly wet, reddish, or reddish with white, with small bleeding spots or venous vascular network, the temperature is slightly lower, the pain is dull to the touch, and the edema is obvious. Third-degree burn means that the whole skin and subcutaneous tissue are burned, even the muscles and bones are burned, which is called third-degree burn. The injured part is leather-like, pale or brown, and may even carbonize, and the temperature is reduced, so there is no feeling at all. It feels hard and there are no blisters. Sometimes, you can see subcutaneous veins embolized in the form of dead trees.
Does picosecond hurt?
Picosecond is an object that can make people feel pain. However, because the laser emission time of picosecond laser is in picosecond (1 picosecond is about one trillionth of a second), and before doing picosecond laser, doctors will anesthetize the skin of beauty seekers. Therefore, whether it is focused shooting or scanning shooting with picosecond laser, picosecond laser will have pain, but this pain will soon disappear.
Because there are many spots on some people's faces, in order to completely remove these spots, it is necessary to make an all-round shooting with picosecond laser. The feeling of full-scale shooting is like cold water splashing on their faces in winter, with a slight tingling, but the pain is weaker than that of concentrated shooting. If the pain is divided into 10 grades, the overall shooting pain index is about 2-3 grades, and the specific pain feeling still varies from person to person.
Although many beauty seekers express instantaneous pain after experiencing picosecond laser, the picosecond laser has a short laser pulse, which is not easy to affect the nearby normal skin area. Therefore, although picosecond laser has a short-term pain, the damage to the skin is still much less than that of ordinary laser.
Beauty seekers usually feel some pain when doing picosecond laser, and may have a slight burning sensation after finishing (depending on the treatment intensity and picosecond laser wavelength), which is the result of laser heat transfer to skin tissue. Usually, after picosecond laser, the medical staff will apply a calming mask to the beauty seeker, which can relieve the pain of the beauty seeker at the first time.
Picosecond preventive measures
1. Some parents with sensitive skin may have some redness and swelling after picosecond laser treatment, which is caused by the thermal effect of the skin after laser treatment. Generally, ice cubes can be used to contract capillaries to achieve the effect of relieving redness and swelling.
2. Fully communicate with your attending physician before operation and strictly follow the doctor's advice to ensure that the body produces too much ACMETEA and avoid picosecond side effects.
3. Pay attention to strict sun protection after picosecond laser is finished. The part that has just finished freckle treatment will be very sensitive to sunlight, so it is very important to do a good job of sun protection. Pay attention to sun protection within 3 months after picosecond laser treatment (wear sunglasses, masks and umbrellas when going out).
4. Don't use irritating skin care products after finishing picoseconds. Do not use irritating skin care products, because the skin is still fragile after picoseconds, and some ingredients in skin care products may cause irritation to the skin, so it is best to wait until one month after picosecond laser is completed.
5. Avoid oral administration of pure collagen before and after operation, especially after autologous collagen has been stimulated after operation. Adding ultra-pure collagen will cause collagen variation, which will lead to greater folding risk and a series of side effects.
American life laboratory research shows that the life span and quality of all cells under the skin, whether you can see them or not, will be affected by external stimuli, the surrounding environment of cells, and the nutrition and quality of cells themselves. With the increase of age, the aging of chromosome telomere will accelerate cell necrosis. The older the cell, the lower the instinct of self-repair after damage, and it will not function normally. Therefore, the human body needs to repair damaged cells quickly and intensively to generate new cells. ACMETEA is produced too fast, which helps cells to complete stress response, thus repairing damaged cells, mutant cells and atrophic cells, stimulating tissue regeneration, intensive repair, increasing elastic fiber density and increasing intercellular density.
Everyone has their own unique views on the efficacy and harm of picoseconds, and it is important to understand why picoseconds are suitable for them. Finally, remind everyone not to take collagen before and after picoseconds. Excessive supplementation of collagen will cause a series of bad things such as collagen mutation and scarring in our skin.