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Related Experiment Video

Updated: Apr 29, 2026

Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
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The new mid-scala electrode array: a radiologic and histologic study in human temporal bones.

Frederike Hassepass1, Stefan Bulla, Wolfgang Maier

  • 1*Department of Otorhinolaryngology-Head and Neck Surgery, †Department of Radiology, and ‡Institute of Musicians' Medicine, Freiburg University Medical Center, Freiburg, Germany.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|May 20, 2014
PubMed
Summary

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Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·2025

The new mid-scala (MS) electrode allows for safe and atraumatic insertion into the cochlea via round window or cochleostomy approaches. Rotational tomography (RT) can verify electrode position, ensuring quality control for cochlear implant surgery.

Area of Science:

  • Otorhinolaryngology
  • Biomedical Engineering
  • Neurosurgery

Background:

  • Cochlear implant surgery seeks safe electrode array placement, with ongoing debate on cochleostomy vs. round window (RW) insertion and lateral wall vs. perimodiolar placement.
  • Electrode insertion can cause intracochlear trauma, depending on insertion method and electrode design, potentially damaging delicate cochlear structures.

Purpose of the Study:

  • To evaluate the insertion quality of the novel mid-scala (MS) electrode.
  • To assess the MS electrode's potential to reduce trauma to the lateral wall and modiolus by targeting a midscalar position.

Main Methods:

  • A temporal bone (TB) study involving 20 TBs using the MS electrode.
  • Insertion via RW or cochleostomy, followed by analysis of electrode position, length, and angle using rotational tomography (RT).

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  • Histological analysis of TBs and comparison of RT and histology findings.

    • Main Results:

    • Scala tympani (ST) insertion was consistently achieved through both RW and cochleostomy approaches.
    • No significant trauma was observed in 94.7% of ST insertions.
    • RT accurately determined intracochlear electrode position, correlating with histological findings.

    Conclusions:

    • The MS electrode demonstrates reliable and atraumatic intracochlear placement using both RW and cochleostomy methods.
    • RT serves as a valuable tool for assessing intracochlear electrode position and quality control in cochlear implant procedures.