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Related Experiment Videos

High-density cochlear implants with position sensing and control.

Kensall D Wise1, Pamela T Bhatti, Jianbai Wang

  • 1Engineering Research Center for Wireless Integrated MicroSystems, United States. wise@eecs.umich.edu

Hearing Research
|May 23, 2008
PubMed
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This study introduces advanced silicon cochlear electrode arrays for hearing restoration. These high-density arrays offer precise insertion and stimulation capabilities, improving cochlear implant performance.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Cochlear implants are crucial for hearing restoration in severe to profound sensorineural hearing loss.
  • Existing electrode arrays face challenges in precise placement and stimulation control within the cochlea.
  • Advancements in microfabrication are enabling more sophisticated implantable devices.

Purpose of the Study:

  • To develop and characterize a high-density silicon-based cochlear electrode array.
  • To integrate real-time monitoring and control features for improved surgical insertion and device function.
  • To enable precise electrical stimulation for enhanced auditory perception.

Main Methods:

  • Utilized silicon-dielectric-metal-parylene thin-film technology for array fabrication.

Related Experiment Videos

  • Incorporated on-board strain gauges and a tip sensor for real-time insertion imaging and force measurement.
  • Developed integrated circuitry for current generation, response recording, and wireless communication.
  • Implemented pre-stressing techniques for modiolus hugging and precise tip localization (<50 microm).

    • Main Results:

    • Successfully fabricated high-density electrode arrays with up to 32 sites and four parallel stimulation channels.
    • Demonstrated real-time monitoring of array shape and forces during insertion.
    • Achieved precise tip positioning and controlled electrical stimulation (500 microA pulses, 4 micros minimum width).
    • Enabled parallel site stimulation for higher current delivery.

    Conclusions:

    • Silicon-based thin-film technology is suitable for creating advanced cochlear electrode arrays.
    • Integrated sensing and control features enhance the precision and safety of cochlear implantation.
    • The developed array technology holds promise for improved outcomes in cochlear implant recipients.