Design for a simplified cochlear implant system.

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • An, SK; Park, S-I; Jun, SB; Lee, CJ; Byun, KM; Sung, JH; Wilson, BS; Rebscher, SJ; Oh, SH; Kim, SJ

Published Date

  • June 2007

Published In

Volume / Issue

  • 54 / 6 Pt 1

Start / End Page

  • 973 - 982

PubMed ID

  • 17554817

Pubmed Central ID

  • 17554817

Electronic International Standard Serial Number (EISSN)

  • 1558-2531

International Standard Serial Number (ISSN)

  • 0018-9294

Digital Object Identifier (DOI)

  • 10.1109/tbme.2007.895372

Language

  • eng