Ultrasound refers to mechanical vibration waves with frequencies exceeding 20,000 Hz, inaudible to humans. These waves exert mechanical, thermal, and chemical effects. Ultrasonic beauty devices utilize these three properties to treat the facial skin, achieving cosmetic benefits.
Mechanical Action: High-power ultrasonic energy vibrates facial skin cells, creating a micro-massage effect. This alters cellular volume, improving local blood and lymphatic circulation. It enhances cellular permeability, boosts tissue metabolism and regeneration, softens tissues, stimulates the nervous system and cellular functions, and imparts radiance and elasticity to the skin.
Thermal Effect: Ultrasound's thermal action elevates skin surface temperature, accelerating blood circulation and delivering increased nutrients to skin cells. It reduces nerve excitability for analgesic effects and relaxes spasmodic muscle fibers for antispasmodic benefits.The heat generated by ultrasound is endogenous. Approximately 79%–82% of this heat is transported away from the treatment area via blood circulation, while 18%–21% is dispersed to adjacent tissues through thermal conduction. Consequently, patients typically experience no significant sensation of heat.Chemical Effects: Ultrasound enhances catalytic activity, accelerating skin cell metabolism. It shifts tissue pH toward alkalinity, alleviating acidosis and pain associated with skin inflammation. Ultrasound increases cell membrane permeability, facilitating nutrient and drug dispersion. This improves skin nutrient absorption and aids drug penetration into bacteria, enhancing bactericidal efficacy.
Specific functions of ultrasonic beauty devices include: softening blood clots and eliminating "red face." It addresses facial redness and erythema caused by microvascular deformation and circulatory disorders, as well as facial erythema or rosacea resulting from mite infestations.
When using the ultrasonic beauty device, observe these precautions: Probe temperature does not indicate ultrasonic power output; excessive heat may cause skin burns. Diluted liquid medications should not be applied directly, as they may induce skin dryness. Avoid passing the probe over the eyeball or massaging the upper eyelid. Pregnant women and individuals with severe heart conditions should not use this device.