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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
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Human Histology after Structure Preservation Cochlear Implantation via Round Window Insertion.

Alexander Geerardyn1,2,3, MengYu Zhu2, Tim Klabbers4,5

  • 1Department of Otolaryngology-Head & Neck Surgery, Harvard Medical School, Boston, Massachusetts, U.S.A.

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Summary

Round window cochlear implant (CI) insertion causes less intracochlear tissue formation than cochleostomy approaches. This suggests round window insertion may better preserve residual cochlear function after CI surgery.

Keywords:
cochlear implanthistopathologyintracochlear tissueround windowtrauma

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Regenerative Medicine

Background:

  • Current cochlear implant (CI) insertion techniques aim to preserve intracochlear structures and residual cochlear function.
  • The optimal surgical approach to minimize insertion trauma remains debated.

Purpose of the Study:

  • To histologically compare insertional trauma and intracochlear tissue formation in human cochleae following CI insertion via different techniques.

Main Methods:

  • A temporal bone with full-length CI (576°) via round window (RW) insertion was compared to nine cases using cochleostomy (CO) or extended round window (ERW) approaches.
  • Insertional trauma was assessed histologically, and intracochlear fibrosis and neo-ossification volumes were quantified using 3D reconstructions.

Main Results:

  • The RW insertion showed minimal fibro-osseous tissue (10.8% total volume) compared to CO/ERW (mean 30.6%).
  • In the basal 5mm of scala tympani, RW insertion resulted in 12.3% tissue formation versus 93.8% for CO/ERW approaches.
  • Electrode translocation occurred in the RW case, while 2/9 CO/ERW cases had no insertional trauma.

Conclusions:

  • Full-length CI insertion via the RW can be minimally traumatic, avoiding significant local fibro-osseous tissue formation.
  • Drilling a cochleostomy and damaging the endosteum appears to incite a local tissue reaction, supporting the hypothesis.