Electrode to modiolus proximity: a fluoroscopic and histologic analysis

Am J Otol. 2000 Mar;21(2):218-25. doi: 10.1016/s0196-0709(00)80012-5.


Hypothesis: This study was conducted to evaluate the electrode to modiolus proximity of two commonly used electrodes (Nucleus and Clarion) and a new prototype electrode.

Background: Theoretical advantages of modiolus-hugging cochlear implant electrodes include reduced stimulus energy requirements, more efficient power management and longer battery life, more discreet ganglion cell population stimulation, and reduced facial nerve stimulation.

Methods: Fluoroscopic analysis and histologic surface preparation analysis of electrode position and trauma.

Results: The Nucleus straight electrode occupied an outer wall position in the scala tympani. The Clarion electrode occupied a more intermediate position. The actively coiling prototype electrode was modiolus hugging but caused more trauma than the other two electrodes tested.

Conclusions: The optimal modiolus-hugging atraumatic intracochlear electrode does not currently exist.

MeSH terms

  • Cochlear Implantation*
  • Cochlear Implants*
  • Culture Techniques
  • Electric Stimulation / instrumentation
  • Electrodes, Implanted
  • Equipment Design
  • Fluoroscopy / methods*
  • Humans
  • Intraoperative Complications / prevention & control