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Related Experiment Video

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Robotic Cochlear Implantation for Direct Cochlear Access
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Fabrication and evaluation of an improved polymer-based cochlear electrode array for atraumatic insertion.

Tae Mok Gwon1, Kyou Sik Min, Jin Ho Kim

  • 1Department of Electrical and Computer Engineering, Seoul National University, Bldg. 301 Room# 1006, Seoul National University, San 56-1, Shillim-dong, Gwanak-gu, Seoul, 151-742, South Korea.

Biomedical Microdevices
|February 16, 2015
PubMed
Summary

This study introduces a novel liquid crystal polymer (LCP) cochlear electrode array designed for atraumatic implantation in cochlear implants. The new LCP array demonstrates reduced insertion forces and preserves residual hearing, paving the way for improved hearing restoration technologies.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Otolaryngology

Background:

  • Atraumatic cochlear electrode arrays are crucial for high-performance cochlear implants, particularly for electric acoustic stimulation (EAS), emphasizing residual hearing preservation.
  • Conventional wire-based arrays pose challenges for atraumatic insertion and hearing preservation.

Purpose of the Study:

  • To propose and demonstrate a novel, improved design for a cochlear electrode array utilizing liquid crystal polymer (LCP) for atraumatic implantation.
  • To evaluate the mechanical properties and efficacy of the new LCP-based array.

Main Methods:

  • Fabrication of a multi-layered LCP array using precise batch processes, thin-film LCP processing, and thermal press lamination.
  • Development of a peripheral blind via and self-aligned silicone elastomer molding to reduce array width.
  • Measurement of insertion and extraction forces in a human scala tympani model, human temporal bone insertion trials, and acute electrically evoked auditory brainstem responses (EABR) recording in guinea pigs.

Main Results:

  • Finalized LCP electrode arrays with tip and base diameters of 0.3 mm and 0.75 mm, respectively.
  • Low insertion force (2.4 mN at 8 mm displacement) and maximum extraction force (34.0 mN).
  • Successful atraumatic insertion (360°–630°) in human temporal bones and confirmation of array efficacy via EABR data.

Conclusions:

  • A new LCP-based cochlear electrode array design has been successfully fabricated for atraumatic implantation.
  • The developed array demonstrates favorable mechanical properties and efficacy, indicating potential for advanced cochlear implant development and clinical application.