Hypothesis: This study was conducted to evaluate the electrode to modiolus
proximity of two commonly used electrodes (Nucleus and Clarion) and a new p
rototype electrode.
Background: Theoretical advantages of modiolus-hugging cochlear implant ele
ctrodes 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 posit
ion. The actively coiling prototype electrode was modiolus hugging but caus
ed more trauma than the other two electrodes tested.
Conclusions: The optimal modiolus-hugging atraumatic intracochlear electrod
e does not currently exist.