Iowa/Nucleus 10/10 mm Electrode Array: The Iowa/Nucleus 10/ 10 mm electrode array was designed to reduce the incidence of intracochlear injury and developed by the Iowa Cochlear Implant Team and Cochlear Americas. This array was designed to preserve the scala media, organ of Corti and supporting cells of the implanted ear for future advances in molecular and/or genetic treatments of the inner ear. This investigational device is very