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A Polymer Cochlear Electrode Array: Atraumatic Deep Insertion, Tripolar Stimulation, and Long-Term Reliability

  • Tae Mok Gwon
Book

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xxv
  2. Tae Mok Gwon
    Pages 1-11
  3. Tae Mok Gwon
    Pages 13-42
  4. Tae Mok Gwon
    Pages 43-63
  5. Tae Mok Gwon
    Pages 65-86
  6. Tae Mok Gwon
    Pages 87-88

About this book

Introduction

This book describes the design, fabrication and evaluation of a polymer-based neural interface for a cochlear electrode array, reviewed in terms of fabrication process, functionality, and reliability. Polymer-based devices have attracted attention in the neural prosthetic field due to their flexibility and compatibility with micro-fabrication process. A liquid crystal polymer (LCP) is an inert, highly water-resistant polymer suitable for the encapsulation of electronic components and as a substrate material for fabricating neural interfaces. The author has designed, fabricated, and evaluated an LCP-based cochlear electrode array for an improved polymer-based cochlear implant. The thesis deals with 3 key topics: atraumatic deep insertion, tripolar stimulation, and long-term reliability. Atraumatic insertion of the intracochlear electrode and resulting preservation of residual hearing have become essential in state–of-the-art cochlear implantation. A novel tapered design of an LCP-based cochlear electrode array is presented to meet such goals. For high-density and pitch-recognizable cochlear implant, channel interaction should be avoided. Local tripolar stimulation using multi-layered electrode sites are shown to achieve highly focused electrical stimulation. This thesis addresses another vital issue in the polymer-based neural implants: the long-term reliability issue. After suggesting a new method of forming mechanical interlocking to improve polymer-metal adhesion, the author performs accelerating aging tests to verify the method’s efficacy. The aforementioned three topics have been thoroughly examined through various in vitro and in vivo studies. Verification foresees the development of LCP-based cochlear electrode array for an atraumatic deep insertion, advanced stimulation, and long-term clinical implant.

Keywords

Polymer-based biomedical devices Liquid crystal polymer (LCP) LCP-based cochlear electrode array polymer-based cochlear implant atraumatic deep insertion intracochlear electrode tripolar stimulation multi-layered electrode sites polymer-based neural implants

Authors and affiliations

  • Tae Mok Gwon
    • 1
  1. 1.Department of Electrical and Computer EngineeringSeoul National UniversitySeoulKorea (Republic of)

Bibliographic information