The working principle of the high-frequency electrosurgical tungsten needle is to use the thermal effect generated when high-frequency, high-voltage alternating current passes through the tissue to vaporize and coagulate the tissue to achieve the purpose of cutting and coagulation. It heats the tissue when the high-frequency and high-voltage current generated by the effective electrode tip contacts the body, realizes the separation and coagulation of the body tissue, and thus plays the role of cutting and hemostasis.
When the current flows through the human tissue, in addition to the thermal effect, it will also produce an ionization effect that causes chemical burns to the muscle tissue, as well as a Faraday effect that causes nerve stimulation, muscle stimulation and pain. Studies have found that when the frequency of the current is higher than 300KHz, the human nervous system and muscles are insensitive to the stimulation of the current, and the ionization effect and Faraday effect are correspondingly reduced or disappeared. The high-frequency electric knife uses a high-frequency current higher than 300KHz to selectively destroy human tissues through appropriate control of the output power to achieve cutting and coagulation.
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