title: The advanced Combi 40+ cochlear implant.
abstract: A 12-channel cochlear implant (CI) for high-rate pulsatile stimulation strategies is presented. Symmetric biphasic current pulses can be generated up to a maximum pulse repetition rate of 18.18 kpulses/second. The stimulation pulse amplitude can be selected within 1.5 microA-1.5 mA. Data and power are transcutaneously transferred using a single radiofrequency (RF) channel. A fully digital data transfer format is employed at an overall data rate of 600 kBit/second. The implant contains a single mixed analog/digital CMOS-ASIC (Application Specific Integrated Description) for data synchronization and stimulus generation. Stimulation signals are applied via a monopolar intracochlear multichannel electrode. Output capacitors for each channel are employed for safety reasons. A self-calibrating back telemetry system is included for estimating the channel impedances and field distribution along the electrode array. Dimensions of the ceramic package of the implant are only 33.50 x 23.40 x 3.95 mm3.
authors.affiliation: Institute for Applied Physics/Microelectronics, University of Innsbruck, Austria.
authors.forename: C M
authors.initials: CM
authors.lastname: Zierhofer
authors.forename: I J
authors.initials: IJ
authors.lastname: Hochmair
authors.forename: E S
authors.initials: ES
authors.lastname: Hochmair
mesh_terms: D019929:Cochlear Implantation; D003638:Deafness / Q000601:surgery*; D004558:Electric Stimulation / Q000295:instrumentation; D004867:Equipment Design; D006801:Humans; D013686:Telemetry / Q000295:instrumentation