Epidermal Protection

Epidermal protection refers to the safety principle and design features that keep the skin’s surface layer — the epidermis — unharmed while HIFU energy acts on deeper tissue. Two things primarily achieve this: precise focal-depth calibration, so the ultrasound waves converge (and release most of their energy) below the epidermis rather than at it, and ultrasound gel, which allows energy to pass through the surface efficiently instead of being absorbed or reflected at skin level. Together, these mean the epidermis experiences the ultrasound energy only in passing, on its way to the target depth, rather than as the treatment site itself — which is why HIFU, correctly used, doesn’t require topical anaesthetic or leave visible surface marks the way some ablative treatments do. ULTRAISER devices are engineered and certified (CE, FCC, KC) with this principle built into their focal-depth and gel-use instructions.