Thermamedic Medical System

The Ultrasound

Ultrasound (US) technology has been used in medicine for many years in a wide variety of therapies such as renal lithotripsy using high power US, physiotherapy using medium and low intensity and ecographies using very low power.

Ultrasounds (from now on we shall use the abbreviation US) are sound waves that, via the vibration of a crystal housed in the hand piece, generates mechanical energy in the body in which it is produced, which can give rise to certain effects in living tissues.

We are introducing a new platform, unique in the market for the use of combinated technologies based on our own Dynamic Fequency Management System XDMF (Xperion Dynamic Management of Frequencies) this puts us at the technology front line in Radiofrequency for aesthetic medicine use.

The human ear is capable of hearing sounds ranging between 16 and 20,000 Hz, depending on age and ability to perceive sound, which decreases with age. Above 20KHz, such phenomena are known as Ultrasounds.

The waves can vary principally in the following parameters:

FREQUENCY

The number of times a particular wave undergoes a complete cycle of compression/rarefaction in 1 sec. The classic US systems used in physiotherapy work within ranges of 1 MHz – 3 MHz. In aesthetic medicine, for cavitation regeneration, it is considered that the range should be between 30 and 40 KHz.

WAVE LENGTH

The distance between two equivalent points of the wave in a concrete medium.

VELOCITY

When a body is subjected to an RF electrical field, molecules tend to vibrate in order to follow the change in direction of the electrical field. This effect releases heat that is greater in molecules which are not isoelectric and in tissues with higher resistance (poorly vascularised tissues and cellular membranes).

Basic difference between RF and external tissue heating.

The speed at which the wave travels across the medium. In a saline solution, the speed of the US is approximately 1,500 m sec-1, whereas in air, the speed is 350 m sec-1. Speed is highly dependent on the density of the medium. The speed of the US waves in most living tissues is similar to that which occurs in a saline medium.

These three factors, frequency, wavelength and velocity maintain the same relationship for any type of tissue, but their values differ greatly for each of them. Tables describing average values for each tissue with such values are available.

MECHANISM OF ACTION

US are LONGITUDINAL energy sound waves and they consist of areas of COMPRESSION and of RAREFACTION. When a material receives sound waves, it absorbs energy that produces molecular vibration which in turn generates heat, which is capable of producing metabolic and structural alterations to the cells being treated.

But this is not the only effect produced with US. To this end, in certain situations, we must add the mechanical impact due to the microbubbles formed in the liquid medium of the extracellular matrix (ECM) due to the effect of cavitation.

Cavitation is a process that consists of the formation of cavities of vapour or gas inside a liquid subjected to turbulence. When such turbulence is generated by ultrasounds it is called acoustic cavitation (AC).
The process is formed by the transitory increase in the internal pressure in the liquid as it turns from liquid to vaporous state.

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