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Precurved Cochlear Implants and Tip Foldover: A Cadaveric Imaging Study.

  • Trakimas, Danielle R1, 2, 3
  • Kozin, Elliott D1, 2
  • Ghanad, Iman1, 2
  • Barber, Sam R1, 2
  • Curtin, Hugh4
  • Remenschneider, Aaron K1, 2, 5
  • 1 1 Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA.
  • 2 2 Department of Otolaryngology, Harvard Medical School, Boston, Massachusetts, USA.
  • 3 3 University of Massachusetts Medical School, Worcester, Massachusetts, USA.
  • 4 4 Department of Radiology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA.
  • 5 5 Department of Otolaryngology, UMass Memorial Medical Center, Worcester, Massachusetts, USA.
Published Article
SAGE Publications
Publication Date
Oct 01, 2017
DOI: 10.1177/0194599817738978
PMID: 29086634


Objective This study aims to define a reliable protocol for radiographic identification of placement and tip foldover of newly designed precurved and straight electrodes. Study Design Prospective imaging study. Setting Academic institution. Methods Three models of cochlear implants (Cochlear, MED-EL, and Advanced Bionics) were inserted into fresh cadaveric specimens (n = 2) in 3 configurations (normal positioning in the scala tympani, intracochlear tip foldover, and placement into the vestibular system) for a total of 9 implant scenarios. Specimens were imaged with plain radiography in Stenvers projection, as well as by high-resolution computed tomography. Results Electrode placement and presence or absence of electrode tip foldover were easily identified in all 9 scenarios on plain radiography based on the described technique. Each was confirmed with high-resolution computed tomography. Plain film temporal bone images of new electrode designs with proper and improper placement are provided for reference. Conclusion A defined protocol for intraoperative plain film radiography allowed for reliable imaging of 3 newly designed cochlear implant electrodes and immediate identification of extracochlear placement and tip foldover. Findings may be used for intraoperative confirmation of electrode array placement.

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