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Effects of Electrode Position on Vestibular Implant Performance in Rhesus Macaque.

Brian J Morris1, Katherine N Mueller1, Celia C Fernandez Brillet1

  • 1Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA.

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Summary

Optimizing vestibular implant electrode placement is crucial for restoring 3D VOR. Deep stimulating electrodes and labyrinthine return electrodes enhance response strength and alignment, improving outcomes for vestibular hypofunction.

Keywords:
Bilateral vestibular hypofunctionBilateral vestibulopathyCochlear implantElectrodesMacaqueMonkeyRhesusSemicircular canalVestibularVestibular implantVestibular prosthesisVestibulo-ocular reflex

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Otolaryngology

Background:

  • Bilateral vestibular hypofunction (BVH) significantly impairs balance and vision.
  • Vestibular implants (VIs) offer a potential solution by stimulating the vestibular nerve.
  • Optimizing electrode design is critical for effective VI function.

Purpose of the Study:

  • To empirically evaluate the impact of electrode placement on vestibular implant performance.
  • To determine optimal configurations for stimulating and return electrodes in semicircular canal VIs.
  • To validate computational model predictions with experimental data.

Main Methods:

  • Unilateral implantation of stimulating electrodes in semicircular canals of rhesus macaques.
  • Placement of return electrodes both inside and outside the temporal bone.
  • Quantification of 3D vestibulo-ocular reflex (VOR) response magnitude and misalignment using mixed-effects ANOVA.

Main Results:

  • Deepest stimulating electrodes in each canal produced the strongest, most aligned 3D VOR responses.
  • Electrode position differences as small as 600-750 µm significantly affected VOR outcomes.
  • Intralabyrinthine return electrodes yielded superior VOR responses compared to extratemporal bone placements.
  • Near-bipolar stimulation improved response alignment.

Conclusions:

  • A single deep stimulating electrode per canal with a common return electrode can be sufficient for VI function.
  • Placement of return electrodes within the labyrinth enhances spatial selectivity.
  • Future VIs could benefit from multiple independent return electrode channels for near-bipolar stimulation.
  • Repurposing unused channels could enable stimulation of other vestibular endorgans or the cochlea.