Design for a simplified cochlear implant system

Soon Kwan An, Se Ik Park, Sang Beom Jun, Choong Jae Lee, Kyung Min Byun, Jung Hyun Sung, Blake S. Wilson, Stephen J. Rebscher, Seung Ha Oh, Sung June Kim

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

A simplified cochlear implant (CI) system would be appropriate for widespread use in developing countries. Here, we describe a CI that we have designed to realize such a concept. The system implements 8 channels of processing and stimulation using the continuous interleaved sampling (CIS) strategy. A generic digital signal processing (DSP) chip is used for the processing, and the filtering functions are performed with a fast Fourier transform (FFT) of a microphone or other input. Data derived from the processing are transmitted through an inductive link using pulse width modulation (PWM) encoding and amplitude shift keying (ASK) modulation. The same link is used in the reverse direction for backward telemetry of electrode and system information. A custom receiver-stimulator chip has been developed that demodulates incoming data using pulse counting and produces charge balanced biphasic pulses at 1000 pulses/s/electrode. This chip is encased in a titanium package that is hermetically sealed using a simple but effective method. A low cost metal-silicon hybrid mold has been developed for fabricating an intracochlear electrode array with 16 ball-shaped stimulating contacts.

Original languageEnglish
Pages (from-to)973-982
Number of pages10
JournalIEEE Transactions on Biomedical Engineering
Volume54
Issue number6
DOIs
StatePublished - Jun 2007

Keywords

  • Auditory prosthesis
  • Cochlear implant system
  • Continuous interleaved sampling
  • Electrode array
  • Hermetic package
  • Neural prosthesis
  • Neural stimulation

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