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Related Concept Videos

Hair Cells01:22

Hair Cells

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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The Cochlea01:13

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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A polymer-based multichannel cochlear electrode array.

Kyou Sik Min1, Seung Ha Oh, Min-Hyun Park

  • 1*School of Electrical Engineering and Computer Science, †Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, ‡Sensory Organ Research Institute, Seoul National University Biomedical Research Institute, Seoul, Republic of Korea §Department of Otorhinolaryngology, Boramae Medical Center, SMG-SNU, Seoul, Korea.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|April 23, 2014
PubMed
Summary
This summary is machine-generated.

A new liquid crystal polymer (LCP) electrode array for cochlear implants was developed. This polymer-based device shows promising electrical and mechanical properties for clinical applications.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Otolaryngology

Background:

  • Conventional cochlear electrode arrays are hand-assembled and wire-based.
  • Polymer-based implants offer advantages in precision and cost-effectiveness due to thin-film processes.

Purpose of the Study:

  • To devise a novel cochlear electrode array utilizing a high-performance liquid crystal polymer (LCP) material.
  • To encapsulate the LCP electrode array in silicone elastomer for enhanced biocompatibility and performance.

Main Methods:

  • Fabrication involved thin-film processes with LCP films and self-aligning molding.
  • Electrical properties (capacitance, impedance) and mechanical properties (deflection, insertion/extraction forces) were measured.
  • Feasibility was assessed through insertion trials in a plastic cochlear model and human temporal bones.

Main Results:

  • The LCP array exhibited a charge storage capacity of 33.26 mC/cm and impedance of 1.02 kΩ at 1 kHz.
  • Mechanical tests showed low deflection forces (3.15 g vertical, 1.07 g horizontal) and manageable insertion/extraction forces.
  • Human temporal bone insertions revealed no trauma in two cases, but basilar membrane rupture in three.

Conclusions:

  • A liquid crystal polymer (LCP)-based intracochlear electrode array was successfully fabricated.
  • The fabricated array demonstrated suitable electrical and mechanical properties for potential clinical use.
  • Further research is needed to address safety concerns highlighted by basilar membrane ruptures in human trials.