The ultrasound, through the rise and fall of ultrasonic pressure, acts on the tissue causing sinusoidal variations. A drop in pressure is likely to cause cellular lesions through a mechanism referred to as cavitation.

The cavitational effect is proportional to the wavelength of the ultrasound waves (the inverse of the wave frequency multiplied by the speed of conduction i.e. 1500 m/second), as well as the size of the target in question i.e. the fat cell.

Low frequency ultrasound waves have longer wavelengths:
- in our case: 30 000 HZ corresponds with a wavelength of 5 cm in a liquid medium.

An ultrasonic machine has been designed in order to achieve a summation of ultrasonic effects under the skin.

This summation is obtained by applying two ultrasonic fields in phase, the difference in frequency being less than 0,6%.

The lytic effect is thus obtained by combining the summation of the two low frequency ultrasonic fields on weakened tissue when the fat cells have been increased in volume.