How it works
HIFU means High Intensity Focused Ultrasound. The handle focuses sound to a point at a fixed depth, so tissue at the focus heats hard and the skin above is spared. Laubach and colleagues showed in 2008 that focused ultrasound places precise, predictable coagulation below the epidermis without breaking the surface.
Heat is only the trigger. Collagen fibrils begin denaturing in the high 50s Celsius and denature fully near 65°C, per the 2025 narrative review by Vachiramon and colleagues, which frames the 60°C to 70°C SMAS figure in our device manuals. Tiny coagulation points form. The body reads them as injury and rebuilds; histology in that review follows those points maturing from day 14 through day 90. Our manuals put remodeling at 90 to 180 days. The tightening felt on the day is real; the result kept is the slow one.
Depth comes from the cartridge, never from turning the power up. Our engineering archive's skin anatomy training deck puts the epidermis at roughly 0.1 to 0.4mm and the dermis at roughly 0.5 to 4mm, with the subcutaneous layer below the dermis and above the fascia. 4.5mm reaches the SMAS fascia layer, 3.0mm the deep dermis, 1.5mm on the V-max handle works the superficial layers, and 6mm through 16mm is body work. Output runs 4-7MHz at 10-200W, one shot delivers 12 lines.
