MYTHS AND FACTS ABOUT THE FREQUENCY IN TECARTHERAPY
At present, there is big confusion in the market when talking about the frequency of tecartherapy devices, their power and accessories (capacitive, resistive, automatic plates).
Physiotherapists are confused when deciding on the suitability of a particular tecartherapy equipment.
In the market there are trademarks that insist on highlighting a specific frequency, emphasizing its patentability, and also highlighting their frequency as the sole and unique: these brands claim their frequency is the only one to generate effectiveness for tecartherapy treatments.
These arguments are not objective and generate more confusion for professionals, because they only aim purely commercial interests. Consequently, we must clarify that:
1. You can not patent a technical parameter as a frequency.
2. The frequency used in tecartherapy is optimal in a range of approximately 0.5 MHz to 3 MHz: this range of frequencies is known as Long Wave.
This document specifically explains the frequency and the thermal effect generated by these currents in the tissues, what depends on, and how they act in different organic structures.
We begin by describing the type of current tecartherapy machines belong to:
Tecartherapy machines are diathermy devices whose frequency is stablished around 0.5 MHz and 3 MHz. In these devices, the current flows through the body of the patient by conduction through contact electrodes: these are capacitive & resistive electrodes, and automatic plates.
The heating of the biological tissue in a diathermy system depends on:
1. The distribution of the power density applied in the tissues, which depends on the distribution of the electrical current into the body and of the values of electrical parameters of the tissue (conductivity and permittivity).
2. The thermal characteristics of the tissue: blood perfusion and thermal conduction.
3. The position of the electrodes on the body of the patient determines the distribution of the current.
The electrical parameters of the tissue depend on each tissue.
You must resort to methods of electromagnetic and thermal numerical calculation to theoretically determine the heating of tissues.
The study by Professor PERE RIU from the UPC (Politechnical University of Barcelona), analyzes the dielectric parameters of biological tissues. In this paper, you can observe the calculations which are obtained out from the values published in the work of Camelia Gabriel et altri, 19961 . These features mostly belong to animal tissues measured shortly after removal.
1 Camelia gabriel. Compilation of the dielectric properties of body tissues at RF and microwave frequencies. Brooks Air Force Base, Texas 1996
In this paper, the author concludes that:
- Current distribution inside the human body is statistically equal from about 0.5 MHz to 3 MHz.
- The distribution of power deposition is statistically equal from about 0.5 MHz to 3MHz.
- The temperature reached after 30 minutes of application is statistically equal from about 0.5 MHz to 3 MHz
You can not state that there is a higher or lower current penetration within this frequency range (from about 0.5 MHz to 3 MHz) because the differences in the distribution of the current density are not statistically significant (around 5%).
The frequency of approximately 0.5 MHz to about 3 MHz (within a range of + / -15%, including frequency 0,448 MHZ), follow the same distribution in the body, the same power deposition and reaches the same temperature. Therefore, they have the same thermal effects.
“The frequencies have the same thermal effect”
The contribution made to the tecartherapy technique by CAPENERGY is based on the development of medical devices including 3 frequencies (0.8 MHz, 1 MHz and 1.2 MHz). Thanks to the possibility that such devices allow the operator to select the desired frequency, the one that best suits the tissue being treated, the machine ensures a greater energy delivery, depending on the electrical characteristics of the tissue. This results in a further increase in temperature, a more intense mobilization of liquids, and less current dispersion in areas where the energy flow is not required.