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CNT bundle-based thin intracochlear electrode array.

Gwang Jin Choi1,2, Tae Mok Gwon1, Doo Hee Kim3

  • 1Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, South Korea.

Biomedical Microdevices
|March 9, 2019
PubMed
Summary
This summary is machine-generated.

A novel carbon nanotube (CNT) bundle electrode array was developed to reduce trauma during cochlear implant surgery. This flexible electrode demonstrated lower insertion force and confirmed functionality via auditory brainstem responses.

Keywords:
Carbon nanotube fiberIntracochlear electrode arrayNeural interfaceSoft neural microelectrodes

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Neuroscience

Background:

  • Intracochlear electrode insertion is critical for hearing restoration.
  • Surgical trauma can negatively impact hearing outcomes.
  • Developing less traumatic electrode insertion methods is crucial.

Purpose of the Study:

  • To develop a thin and flexible intracochlear electrode array using carbon nanotube (CNT) bundles.
  • To reduce trauma associated with electrode insertion during cochlear implant surgery.

Main Methods:

  • Fabricated an 8-channel electrode array by encapsulating eight CNT bundles with silicone elastomer.
  • Assessed mechanical and electrochemical properties for flexibility and feasibility.
  • Confirmed functionality using electrically evoked auditory brainstem responses (eABR) in rats.

Main Results:

  • The CNT electrode array is thin (135 μm apex, 395 μm base) and flexible.
  • Required 6-fold lower insertion force compared to metal wire electrodes.
  • Demonstrated suitable impedance (2.70 kΩ) and charge storage capacity (-708 mC/cm²).
  • eABR waves III and V observed at stimulation currents > 50 μA.

Conclusions:

  • Successfully developed a thin, flexible CNT bundle-based intracochlear electrode array.
  • The electrode exhibits promising mechanical and electrochemical characteristics.
  • This CNT electrode may significantly reduce surgical trauma and improve hearing restoration outcomes.