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A synthetic, self-oscillating vocal fold model platform for studying augmentation injection.

Preston R Murray1, Scott L Thomson1, Marshall E Smith2

  • 1Department of Mechanical Engineering, Brigham Young University, Provo, Utah.

Journal of Voice : Official Journal of the Voice Foundation
|January 31, 2014
PubMed
Summary

A new self-oscillating vocal fold model platform was developed to study augmentation injections. This model successfully simulated bowing and demonstrated that silicone injections can mitigate bowing effects, improving phonation metrics.

Keywords:
BowingDirect linear transformationInjectionMedial surface dynamicsSynthetic vocal fold modelsVocal fold medialization

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Area of Science:

  • Biomechanical Engineering
  • Laryngeal Physiology
  • Acoustic Science

Background:

  • Vocal fold augmentation is a common procedure to address voice disorders.
  • Understanding the mechanical effects of injectables is crucial for optimizing outcomes.
  • Current research often lacks precise mechanical evaluation of augmentation materials.

Purpose of the Study:

  • To design and validate a synthetic, self-oscillating vocal fold model for studying the mechanical effects of augmentation injections.
  • To quantitatively assess changes in phonation parameters following silicone augmentation in a simulated bowed vocal fold model.

Main Methods:

  • Life-sized, synthetic, multilayer vocal fold models were created with adjustable bowing.
  • Phonation metrics including onset pressure, vibration frequency, and flow rate were recorded.
  • Silicone injections of varying quantities were administered to bowed models, and post-injection metrics were compared to pre-injection data.

Main Results:

  • The synthetic models accurately replicated vocal fold vibration, including mucosal wave-like motion.
  • Bowing was successfully simulated and subsequently mitigated by silicone injections.
  • Injections generally led to decreased onset pressure, flow rate, and open quotient, with increased vibration frequency.

Conclusions:

  • The developed self-oscillating vocal fold model provides a viable platform for investigating the mechanical consequences of augmentation procedures.
  • This model can aid in the further exploration and optimization of vocal fold augmentation techniques.