US Patent 5,800,535
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A wireless neural prosthetic device for a primary auditory cortex of a patient includes either a speech processor or a stimulating device for receiving and processing information and a wireless electrode arranged in the primary auditory cortex having a plurality of electrical contacts. The electrode can be arranged in the patient's primary auditory cortex and each of the plurality of electrical contacts independently outputs electrical discharges in accordance with the processed electrical signals. The plurality of electrical contacts can be arranged to approximately tonotopically match the primary auditory cortex.
Howard III, Matthew A. Wireless prosthetic electrode for the brain. US Patent 5,800,535 filed November 01, 1994 and issued September 01, 1998. https://ir.uiowa.edu/patents/194