They are not audible to the human ear which hears only sounds with a frequency lower than 0.02 MHz.

The method for obtaining ultrasound is the same method used for ultrasonography .
The machine uses the inverse piezoelectric effect to generate acoustic waves .
When an electric current passes through the quartz crystals contained in the transducer, the crystals have a continuous mechanical deformation, producing a vibration that emits sound waves.

 

How Does Ultrasound Work?

When the ultrasound penetrates the body, the effect of the vibrations moves all the internal particles and stimulates the reabsorption of the inflammatory liquid.
Ultrasonography transmits energy to the tissue it passes through producing heat.
Another effect is the increase of permeability of the cell membrane that allows the entrance of nutrients and the elimination of residues.

The waves penetrate the body inversely proportional to the frequency.
Ultrasonography with a frequency of 3 MHz works on the surface up to 1 cm deep, while with a frequency of 1 MHz it reaches up to 3 cm deep.
Application to the body is neither invasive nor painful.

 

How is the machine made?

The ultrasound apparatus consists of a current generator. The output power is within a range of 0.1 to 3 Watts. The duration of treatment is 10-15 minutes. There are two ways of applying:

  1. With the mobile transducer or massage where the physiotherapist slides his hand on the patient’s skin and scrubs it.
  2. With the fixed transducer, held firm by a mechanical arm when the area being treated is very limited, like a spur.

It is suitable for:

There are studies on the use of ultrasound for tibial fracture that demonstrate a reduction in consolidation time of 35/40%, but with an application time of 2-3 hours per day.

The contraindications are:

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