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Radiofrequency energy antenna coupling to common laparoscopic instruments: practical implications.

Edward L Jones1, Thomas N Robinson, Jennifer R McHenry

  • 1Department of Surgery, University of Colorado School of Medicine, 12631 East 17th Ave., MS C313, Aurora, CO 80045, USA. edward.jones@ucdenver.edu

Surgical Endoscopy
|May 15, 2012
PubMed
Summary

Electromagnetic coupling, or antenna coupling, can transfer radiofrequency energy between laparoscopic instruments without direct contact. Reducing generator power and separating cords minimizes this unintended heat transfer during surgery.

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Area of Science:

  • Laparoscopic surgery
  • Electromagnetic compatibility
  • Surgical instrumentation

Background:

  • Electromagnetic coupling, termed antenna coupling, can occur between monopolar instruments and other laparoscopic tools without direct contact.
  • This phenomenon can lead to unintended energy transfer and potential thermal effects during surgical procedures.

Purpose of the Study:

  • To quantify the extent of radiofrequency (RF) energy coupling to common laparoscopic instruments.
  • To identify practical methods for minimizing antenna coupling and associated heat transfer.

Main Methods:

  • Monopolar RF energy was delivered to an L-hook in a laparoscopic simulator.
  • The tips of a telescope and grasper were placed near bovine liver tissue, without direct contact with the active electrode.
  • Thermal imaging assessed temperature changes near instrument tips following RF activation.

Main Results:

  • Laparoscopic telescope tips showed significant temperature increases (38.2 ± 8.0 °C) due to RF coupling, compared to graspers (2.2 ± 2.2 °C).
  • Reducing generator power from 30W to 15W significantly decreased heat transfer to the telescope tip.
  • Separating active electrode cords from camera/light cords reduced heat generation compared to parallel bundling.

Conclusions:

  • Common laparoscopic instruments can couple RF energy without direct contact, causing heat transfer to adjacent tissues.
  • Minimizing antenna coupling involves reducing generator power settings and avoiding parallel cord bundling.
  • These findings offer practical strategies to enhance patient safety during laparoscopic procedures.