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capacitive resistive monopolar radiofrequency: different frequencies?

Some concerns I have with the CRET therapy I would like to buy. I was able to analyze some recent research and I wanted to ask for clarification regarding my curiosity. All the research on this modality is based on a devices that work at a frequency of 448 khz, but there are several devices on the market that share the same technology that produce stimulation on several different frequencies (500 Khz 1000 khz etc.) Putting all the marketing statements aside, I could not find any scientific work concerning the effect of radiofrequencies up to 2 mhz on human tissues. the only article I found is this: http://web.eng.fiu.edu/jrieradi/EEGMinicap/GabrieletalPMB2009(ElectricalConductivityTissueFrequenciesBelow1MHz).pdf In this article it is stated that with increasing frequency the permittivity decreases and the conductivity increases (except in the fat tissue that seems to have the opposite behaviour). How can we analyse this data using radiofrequency? can we say that as the frequency increases, the depth of stimulation penetration increases? or does the opposite happen? Are there any other scientific evidence regarding stimulation at 1 MHz? Thank you in advance for your attention Giovanni

giovannicarrossa86@gmail.com

1 month ago

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giovannicarrossa86448
giovannicarrossa86448

thank you for your answer, I already saw that article, but the system used in that report is a bipolar radiofrequency used for aesthetic purposes, I don't know if it shares the same mechanism that can be found on monopolar radiofrequency.

There are some questions that I can't answer 1) HOW HUMAN TISSUES RESPOND TO DIFFERENT FREQUENCIES? I found other sources that states that human tissue impendance (a measure of the opposition to electric current in an electric circuit) drops at high frequency (Electrotherapeutic Devices: Principles, Design, and Applications Artech House Author: George D. O'Clock) SOURCE: You can find it on this link, pages 51-55 https://www.aipro.info/wp/wp-content/uploads/2017/08/Electrical_Properties_Response.pdf

On the other hand, we do have the famous skin effect SOURCE: https://en.wikipedia.org/wiki/Skin_effect

that causes the effective resistance of the conductor to increase at higher frequencies where the skin depth is smaller. The problem is that skin effect was studied on conductors, but the human body is not a copper wire, it's a resistor (at least in my point of view) and when electrical current passes through resistor THEORETICALLY This leads to the impedance dropping with increasing frequency. This is called the Boella Effect.

2)Does monopolar radiofrequency produce electrical current inside the body? monopolar radiofrequency is ,electrically speaking, a capacitor so it produces an inducted current inside the body so how does this circuit responds to different frequencies? This should question could be answered with the Capacitive Reactance phenomenon: the behaviour of a capacitor in a variable frequency circuit as being a sort of frequency controlled resistor that has a high capacitive reactance valuet very low frequencies and low capacitive reactance value at very high frequencies SOURCE: https://www.electronics-tutorials.ws/filter/filter_1.html

So my conclusion is that the higher the frequency the deeper you stimulate, but, again this is just my theory, I would like to be proved wrong or right with real evidence

Thanks in advance

bert.vrijders428
bert.vrijders428

most studies till date have been performed with 448 kHz; there are a few studies using other treatment parameters;in my clinical experience frequency modulation might offer better therapeutical results. However this hypothesis also has to be studied. maybe this article can give you more insight : COREā„¢ Technology: Understanding Penetration Depths of Different RF Modes.

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