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[Capacitive effects during transurethral resections with high-frequency currents (author's transl)]

G Flachenecker, K Fastenmeier, E Schmiedt

    Der Urologe. Ausg. A
    |January 1, 1977
    PubMed
    Summary

    Capacitive currents in transurethral resection devices are safe if the capacity between the feeder and shaft is below 120 pF. This finding prevents urethral heat damage during the surgical procedure.

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    Area of Science:

    • Urology
    • Biomedical Engineering
    • Electrophysiology

    Context:

    • Transurethral resection (TUR) devices utilize a cutting probe fed through an internal line within the device shaft.
    • Capacitive high-frequency currents can flow between this internal feeder line and the device shaft.
    • These currents may cause destructive heat in the urethra if a metallic shaft is employed.

    Purpose:

    • To investigate the safety of capacitive high-frequency currents during transurethral resection procedures.
    • To determine the threshold for capacitive current capacity that prevents thermal damage to the urethra.

    Summary:

    • The study analyzes the capacitive currents generated during transurethral resection (TUR) when a conductive probe is fed through a shaft.
    • It identifies that high-frequency currents between the feeder and a metallic shaft can induce heat within the urethra.

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  • The research demonstrates that no danger arises as long as the capacity between the feeder and shaft remains below 120 picofarads (pF).

    • Impact:

    • Provides critical safety guidelines for the design and use of transurethral resection devices.
    • Helps prevent iatrogenic thermal injury to the urethra during TUR procedures.
    • Establishes a quantifiable safety parameter (120 pF) for device engineers and urologists.