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Demodulated low frequency currents from electrosurgical procedures.

R D Tucker, O H Schmitt, C E Sievert

    Surgery, Gynecology & Obstetrics
    |July 1, 1984
    PubMed
    Summary
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    Electrosurgical procedures can generate dangerous low frequency currents, especially if generator capacitors fail. Higher power settings and coagulation modes increase these current levels, posing a risk to patients.

    Area of Science:

    • Medical Devices
    • Biomedical Engineering
    • Electrosurgery

    Background:

    • Low frequency currents during electrosurgery are typically minor risks.
    • Potential for dangerous currents exists if blocking capacitors fail or during direct cardiac coupling.
    • Some electrosurgical generators inherently produce low-frequency currents up to several milliamperes.

    Purpose of the Study:

    • To investigate the factors influencing low frequency current generation during electrosurgical procedures.
    • To compare current levels between different electrosurgical modes and power settings.

    Main Methods:

    • Electrosurgical generators were operated in different modes (coagulation vs. cutting).
    • Low frequency current output was measured at various power settings.

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  • The impact of generator power output on current magnitude was analyzed.

    • Main Results:

    • The coagulation mode produced significantly higher low frequency currents than the "pure cutting" mode at identical power settings.
    • Increased generator power output directly correlated with a higher magnitude of low frequency currents.
    • Even with functioning capacitors, significant low frequency currents can be generated.

    Conclusions:

    • Electrosurgical generator power settings and operational modes critically influence patient safety regarding low frequency currents.
    • Coagulation mode and higher power outputs necessitate careful monitoring to mitigate risks associated with unintended current flow.
    • Understanding these parameters is crucial for preventing potential harm during electrosurgical interventions.