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There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
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Robotic Cochlear Implantation for Direct Cochlear Access
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An overview of cochlear implant electrode array designs.

Anandhan Dhanasingh1, Claude Jolly1

  • 1MED-EL Medical Electronics GmbH, Innsbruck, Austria.

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|November 6, 2017
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Summary
This summary is machine-generated.

Cochlear implant electrode arrays, including straight lateral wall (LW) and pre-curved modiolar hugging (MH) types, can cause cochlear trauma. MH electrodes may lead to more damage, potentially impacting hearing and vestibular function.

Keywords:
Cochlear electrodeCochlear malformationElectrode translocationPre-curved modiolar huggingStraight lateral wallStructure preservation

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Area of Science:

  • Otoacoustic Engineering
  • Neurosurgery
  • Audiology

Background:

  • Cochlear implant electrode arrays are crucial for hearing restoration.
  • Two main types exist: straight lateral wall (LW) and pre-curved modiolar hugging (MH) arrays.
  • Intra-cochlear structure preservation is key during implantation and explantation.

Purpose of the Study:

  • To compare the potential for intra-cochlear trauma between LW and MH electrode arrays.
  • To identify factors contributing to trauma with MH electrode arrays.
  • To emphasize the importance of selecting appropriate electrodes for individual cochlear anatomy.

Main Methods:

  • Review of electrode array designs and their interaction with cochlear anatomy.
  • Analysis of factors influencing electrode stiffness and insertion trajectory.
  • Correlation of electrode type and insertion characteristics with potential cochlear damage.

Main Results:

  • Both LW and MH electrodes can cause intra-cochlear trauma.
  • MH electrodes are more prone to deviating into the scala vestibuli, potentially damaging the osseous spiral lamina and spiral ligament.
  • Factors like cochlear anatomy variability, electrode geometry, and surgical technique influence MH electrode trauma.

Conclusions:

  • Pre-curved MH electrode arrays pose a higher risk of intra-cochlear trauma compared to LW arrays.
  • Understanding and mitigating factors contributing to MH electrode trauma is essential for preserving hearing and vestibular function.
  • Individualized cochlear assessment and appropriate electrode selection are critical, especially in cases of malformed cochleae.