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Related Experiment Videos

The interaction between electrosurgical generators, endoscopic electrodes, and tissue.

R D Tucker1, C E Sievert, E V Kramolowsky

  • 1Department of Pathology, University of Iowa Hospitals and Clinics, Iowa City 52242.

Gastrointestinal Endoscopy
|March 1, 1992
PubMed
Summary

Monopolar and bipolar endoscopic devices were compared. Bipolar cutting electrodes function best with monopolar generators due to high impedance requirements for effective cutting.

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Area of Science:

  • Surgical Technology
  • Electrosurgery
  • Biomedical Engineering

Background:

  • Endoscopic surgery utilizes monopolar and bipolar devices for cutting and coagulation.
  • Understanding tissue impedance is crucial for optimizing electrosurgical device performance.
  • Variations in impedance affect power delivery and efficacy of surgical tools.

Purpose of the Study:

  • To compare the performance of endoscopic monopolar and bipolar devices during cutting and coagulation.
  • To analyze the relationship between tissue impedance and electrosurgical generator output.
  • To determine optimal generator settings for different electrosurgical modalities.

Main Methods:

  • Comparative analysis of monopolar and bipolar electrosurgical devices on animal models.

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  • Measurement of initial and subsequent tissue impedance during cutting and coagulation.
  • Evaluation of electrosurgical generator power output at varying impedance levels.

    • Main Results:

    • Tissue impedance increases during coagulation (25-50 ohms) and cutting (>1000 ohms).
    • Monopolar generators deliver higher power at high impedances (>1000 ohms) compared to bipolar generators.
    • Bipolar cutting electrodes are less effective with standard bipolar generators due to impedance mismatch.

    Conclusions:

    • Bipolar cutting electrodes require high impedance, favoring monopolar generators.
    • Optimal performance of bipolar cutting electrodes necessitates specialized generators or use with monopolar generators.
    • Generator-electrode impedance compatibility is key for effective endoscopic cutting and coagulation.