Does Laser Beauty Treatment Work?（Part 2)

Laser Beauty Treatment, in fact, is called the clinical treatment of skin diseases with pulse laser in the medical field. Because the equipment is simple to operate, the operating threshold is low, the effect is good, and the cycle is short, consumer demand is strong, and the road to commercialization is particularly rapid. Laser beauty products and advertisements are overwhelming, and it has become a skin care method similar to daily skin care. In fact, this is an emerging clinical discipline, and laser treatment of cosmetic dermatology is only in its initial development stage in my country.

The principle of laser beauty is mainly based on the different reactions of skin tissue to laser: photochemical reaction and heating reaction. Photochemical reactions are because the energy of photons can activate chemical bonds in cell molecules, thereby stimulating specific chemical reactions. The well-known skin tumors are the products of photochemical reactions. But so far, most of the applications of laser in dermatology make use of the heating reaction caused by laser. When the temperature rises, most molecular structures of organisms will denature, leading to cell necrosis, hemostasis and changes in the extracellular matrix. The purpose of treatment.

We are now exposed to the most laser beauty projects, which are wrinkle removal, skin rejuvenation/skin repair, freckle removal, tattoo removal/eyebrow removal, hair removal, tumor cutting, microvascular lesions, etc. However, since everyone is more often exposed to beauty projects that are done simply to become beautiful, we will talk about tattoo removal/eyebrow cleaning, hair removal, and photon beauty (IPL) are discussed.

Tattoo Removal/Eyebrow Removal
Tattoos are insoluble dye particles that are engulfed by phagocytes after the dye is injected into the dermis. Although the basic principles of laser tattoo cleaning are still in the research stage, through a series of experiments, it can be inferred that the working principle of laser tattoo removal is: the dye particles can instantly vaporize and be crushed after absorbing the laser, and the fragmented dye The particles will be released into the extracellular dermis, and some will be excreted through scabs. Most of the rest will enter the lymphatic vessels and be eliminated, and some of the dye particles will be engulfed by phagocytes again.

However, the effect of laser tattoo removal will be affected by many factors. For example, tattoos of different colors react differently to lasers of different wavelengths. Black and blue are the easiest to remove, red and green will be more difficult, and yellow and white will be removed after laser treatment. The effect is not significant, and today's tattoos use many colors, and even the superposition of multiple colors, which affects the effect of laser treatment; moreover, the ingredients of tattoo dyes have become more and more complex in the past 10 years, and some ingredients can cause skin problems. Other symptoms occur, blocking the absorption effect of the dye particles on the laser; in addition, some tattoos are deliberately tattooed very deeply in order to pursue a three-dimensional effect, but because there are certain limitations on the depth of the laser penetrating the skin tissue, it cannot be too deep. Tattoo particles lead to poor treatment results. The following table shows the corresponding tattoo colors for different wavelength laser treatments:

Hair Removal
The more commonly used hair removal technologies on the market include trimming, wax removal, mechanical hair removal, plucking, chemical hair removal agents, etc. However, the hair will grow back quickly after treatment with these methods. The most effective permanent hair removal technology currently is electrolysis. and laser or other light source hair removal. The principle is to damage hair follicles through the irradiation of current/light to achieve the purpose of permanent hair removal. Compared with electrolysis, laser/other light source hair removal can be used to effectively remove hair over a larger area, with less pain, fewer complications, and less potential damage to the tissue surrounding the hair follicles. In order to achieve precise and selective laser irradiation of hair follicles, clinical laser surgery techniques are divided into two types: one is to allow the laser to be absorbed by normal components in the hair follicle structure, such as melanin; the other is to use exogenous pigment particles to Absorbing laser, for example, applying a layer of chemical substances to penetrate into the hair follicles will facilitate the accurate absorption of laser. After absorbing the energy, the temperature of the particles of these chemical substances will increase, generating vibration shock waves, pushing the particles to the hair follicles at high speed, causing various components in the hair follicles to damage. The following table shows the hair removal technology applications of different wavelength lasers:

Among all laser hair removal technologies, semiconductor laser hair removal technology is the most effective, and its hair removal treatment effect is more significant for white hair and blonde hair. The T Super Freezing Point "Diode Laser Hair Removal" that is widely publicized on the market is a relatively new technology. Unlike traditional semiconductor laser hair removal that destroys hair follicles by instantaneous heating, "Water Point Hair Removal" first removes hair follicles and surrounding areas. After the tissue is heated to 4OC, the temperature of the hair follicles is selectively raised to 45°C, which gradually destroys the hair follicles and affects the surrounding blood vessels to provide nutrients to the hair follicles, increasing the effect of hair removal. At the same time, it is equipped with a cooling device to reduce The pain during treatment. Another new technology called "vacuum hair removal" actually uses negative pressure to suck the skin into the treatment instrument head, and the skin will be stretched and thinned, thus shortening the distance between the light source and melanin. , so that the same low energy has a good hair removal effect, and due to the reduction in energy density, the pain of treatment will also be reduced.

Photon Beauty (IPL)
Photon beauty is a concept proposed by Dr. Patrick Butter Sr of California, USA in 1995. The full English name is Intense Pulsed Light, so it is now referred to as IPL, which literally means intense pulsed light. The photon skin rejuvenation technology that became popular around the world in 1998 is defined as the use of strong pulsed photons of continuous wavelengths for non-exfoliative, non-invasive performance treatment at low energy density. Simply put, it uses light with greater energy than ordinary light (pulsed light). ), perform phototherapy to achieve skin rejuvenation without damaging the epidermis. This kind of pulsed light is not a laser because it is a band light (500-1200nm), rather than having a specific wavelength like a laser. The principle of action is that in the band light of 500-1200nm, photons of multiple wavelengths such as 585nm, 694nm, 1064nm, etc. can be targeted to irradiate the melanin, collagen fibers and hemoglobin of the skin separately or simultaneously, so that it can have effects like It has the same effect of receiving multiple very low-energy laser treatments at the same time. For example, melanin is broken due to light absorption and heating, which can fade spots. Hemoglobin is deformed by heat and coagulated to damage capillary endothelial cells and then unblocks blood vessels (577nm). Collagen fibers and elastic fibers are stimulated. Realignment reduces wrinkles and makes skin firmer and more. However, because photons have small energy and are not as concentrated as lasers, their therapeutic effects will be much slower, but at the same time, the irritation to the skin will also be slowed down a lot, so photon beauty is used for long-term care rather than short-term treatment. However, the photon beauty equipment used by different institutions is different, and the specifications and energy used are different. Too high energy or too long irradiation time may still cause local pain, temporary flushing, local scabs or water boils (for side effects, please refer to the previous article) side effects of various laser treatments). Common functions of intense pulsed light of different wavelengths are as follows:

Friends who know about photon beauty may also have heard of OPT, BBL, APT, and DPL besides IPL. So what are these? In fact, OPT, BBL, APT, and DPL are essentially IPL, and they are all classified as strong Pulsed light technology only represents different technical characteristics of the instruments:
:Optimal Pulse Technology (OPT), perfect pulse technology, is the fourth generation IPL technology, with a wavelength range of 515nm-1200nm;
:Advanced OPT (AOPT), tachyon technology, wavelength range 400-600/800-1200nm, has good treatment effect on refractory vascular diseases and acne, but requires high technical skills from doctors;
:Dye Puise Light (DPL), which is dye pulse light, also known as "narrow spectrum light" and "precision light", is a patented technology of Israel Feidon Company, with a wavelength range of 500-600nm/550-650nm;
:Broad Band Light (BBL), that is, broad spectrum light, also known as "BB light", with a wavelength range of 450-1200nm, using a super large spot design, high treatment efficiency and highest comfort, most suitable for long-term anti-aging maintenance
In addition, as household photon beauty devices are becoming more and more common, the China Household Electrical Appliances Association released the standard T/CHEAA O020-2021 "Household Photon Beauty Devices" on December 31, 2021, stipulating that this standard will begin on January 1, 2022 Implementation, this is the first domestic standard issued for home photon beauty device products. Because home photon beauty devices will come into contact with the human skin surface when used, product safety and performance are very important. It stipulates some standards and inspection methods for household photon beauty instruments, and clearly states that the product packaging must contain: product name, model or series model; name and address of the production plant (manufacturer or underwriter); product execution standard number; wavelength; irradiance. Everyone must pay attention to this information when purchasing.

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