We report an average intracochlear stimulating current threshold of μA to evoke an auditory brainstem response in 7 acutely deafened felines. Each array supported 20 platinum sites (180 μm dia., 250 μm pitch), spanning nearly 28 mm in length and 400 μm in width. Additional silicone was applied to the tip to protect neural tissue during insertion and along the array to improve surgical handling. Using a pneumatically driven dispensing system, an average μm (mean ± SD) thickness layer of silicone adhesive coating was applied to stiffen the underside of polyimide multisite arrays. We present an effective method for tailoring the flexibility of a commercial thin-film polymer electrode array for intracochlear electrical stimulation.
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