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Test Electrode-Based Estimation of Achievable Insertion Depth in Cochlear Implantation.

Rabea M Alsabellha1, Nouf Al Rayyes2, Rana Al Sabilah3

  • 1Cochlear Implant Center, King Abdulaziz Specialist Hospital; Jouf-kash-ent@moh.gov.sa.

Journal of Visualized Experiments : Jove
|August 11, 2025
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Summary

A novel flexible test electrode with depth markers accurately measures insertion depth in cochlear implant (CI) surgery. This tool helps select optimal electrode lengths, improving surgical accuracy and patient outcomes.

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Last Updated: Sep 11, 2025

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Area of Science:

  • Otolaryngology
  • Biomedical Engineering
  • Neurosurgery

Background:

  • Optimal cochlear implant (CI) electrode array length selection is crucial for effectiveness.
  • Preoperative radiological estimates often differ from intraoperative insertion depths.
  • Accurate electrode length is vital for maximizing hearing outcomes in patients with profound deafness.

Purpose of the Study:

  • To evaluate a flexible insertion test electrode with depth markers for determining practical electrode insertion depth.
  • To assess the feasibility of this tool in guiding CI electrode array selection before implantation.
  • To improve preoperative planning and surgical accuracy in cochlear implantation.

Main Methods:

  • A custom 31.5 mm flexible test electrode with colored depth markers was used.
  • The test electrode was inserted into the scala tympani (ST) to assess cochlear lumen accessibility.
  • Standard CI surgical procedures, including impedance telemetry and evoked potentials, were employed.

Main Results:

  • The test electrode allowed real-time determination of achievable insertion depth.
  • Surgeons could tailor CI electrode array lengths to the optimal depth for individual patients.
  • This approach mitigated incomplete insertions and enhanced preoperative planning.

Conclusions:

  • The proposed insertion test electrode facilitates precise electrode length selection in cochlear implant surgery.
  • This method minimizes complications associated with electrode placement.
  • It offers a new approach to improve surgical accuracy and patient outcomes in cochlear implantation.