The histopathological effects of chronic electrical stimulation of the cat cochlea

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Abstract
The success of a cochlear implant depends on stimulating an adequate number of viable spiral ganglion cells. The effect of chronic electrical stimulation on ganglion cells was an important consideration when assessing the effectiveness and safety of such a device. The histopathological assessment of chronic unstimulated intracochlear electrodes was well documented (Simmons, 1967; Clark, 1973; Clark et al., 1975; Schindler and Merzenich, 1974; Schindler, 1876; Schindler et al, 1977; Sutton et al., 1980). These studies used a variety of electrode designs, materials and surgical techniques. All have shown that chronic implantation has little effect on the peripheral nerves and the spiral ganglion cells adjacent to an implant, provided the insertion procedure is free of trauma and infection.

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