Objective: A perimodiolar prototype electrode array has been evaluated on 1
2 human temporal bone specimens, To achieve modiolar proximity, a fine Teno
n(TM) positioner is attached to the tip and base of a conventional Nucleus
22 electrode array. Methods: Intracochlear electrode position was examined
by macro scopic preparation and confirmed by a cochlear view x-ray after in
sertion into human temporal bones. The temporal bones were examined with li
ght microscopy for intracochlear trauma after insertion, explantation, and
re-implantation of the perimodiolar array. Results: Macroscopic preparation
and x-ray confirmed close proximity of the intracochlear electrodes to the
modiolar wall. In some bones, electrode insertion and positioning was perf
ormed without significant damage to intracochlear structures, but explantat
ion caused varying degrees of trauma depending on the explantation techniqu
e used. Re-implantation and repeat explantation appeared to destroy most of
the intracochlear architecture. Conclusions: The perimodiolar electrode ar
ray prototype with Tenon positioner cannot be recommended for clinical use,
especially in children in whom the possibility for re-implantation is high
.