When used diagnostically, low energy beams of convergent ultrasound are rapidly scanned over relatively broad areas of the body. HIFU energy is relatively high energy and highly convergent. This enables HIFU to be focused to very high intensity at a specific location and in a very small volume. HIFU directly delivers heat energy to the skin and subcutaneous tissues that can stimulate and renew the skin’s collagen and thus improves the texture and reducing sagging of the skin.
When electrical energy is transferred to the ceramic of HIFU transducer, electrical energy transforms into ultrasound. It creates ‘selective thermal coagulative zone’ on Superficial Muscular Aponeurotic System (SMAS) layer without damaging epidermis and subcutaneous tissue. These thermal coagulation zones react to high energy of over 60˚C. This causes the sagging skin tissues to contract and results in skin tightening and lifting effects. A single session can give result for 1-3 years.
Importantly, the intensity levels above and below the focal zone remains relatively low. As the lesions produced by HIFU are spatially isolated within the treated tissue with no surrounding cellular damage, they are often referred to as “trackless” lesions. When applied to the human body, the HIFU beam above the focal point passes through intact skin and superficial tissues without causing injury although thermal tissue damage occurs at the focal point.