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Laryngeal pacemaker using a temperature sensor in the canine.

K M Kim1, H S Choi, G R Kim

  • 1Department of Otolaryngology, Yonsei University College of Medicine, Seoul, Korea.

The Laryngoscope
|October 1, 1987
PubMed
Summary
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This study demonstrates a novel method for controlling vocal fold abduction during breathing in dogs. Electrical pacing of the posterior cricoarytenoid muscle, triggered by respiratory airflow, successfully synchronized vocal fold movement with inspiration.

Area of Science:

  • Respiratory Physiology
  • Neuromuscular Electrical Stimulation
  • Laryngeal Electrophysiology

Background:

  • Artificial paralysis of the recurrent laryngeal nerves in dogs creates a model for studying laryngeal muscle function.
  • The posterior cricoarytenoid muscle is crucial for vocal fold abduction during inspiration.
  • Synchronized vocal fold movement with respiration is essential for normal breathing.

Purpose of the Study:

  • To develop and test a system for electrically stimulating the posterior cricoarytenoid muscle.
  • To achieve synchronized vocal fold abduction with inspiration in paralyzed canine larynges.
  • To investigate a temperature-based trigger for respiratory-gated electrical stimulation.

Main Methods:

  • A temperature sensor was used to detect airflow differences between inspiration and expiration in the pharynx.

Related Experiment Videos

  • This temperature difference generated a trigger pulse at the onset of inspiration.
  • Electrical stimulation pulses were delivered to electrodes in the posterior cricoarytenoid muscles following the trigger.

    • Main Results:

    • The developed system successfully triggered electrical stimulation of the posterior cricoarytenoid muscles.
    • In all five canine subjects, vocal fold abduction was clearly observed.
    • The observed abduction was synchronized with the inspiratory phase of respiration.

    Conclusions:

    • Respiratory-gated electrical stimulation of the posterior cricoarytenoid muscle is a viable method for inducing vocal fold abduction.
    • This technique shows promise for restoring inspiratory vocal fold movement in conditions with laryngeal nerve paralysis.
    • Temperature-based triggering offers a non-invasive approach for respiratory-synchronized laryngeal pacing.