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High-Density, Actively Multiplexed μECoG Array on Reinforced Silicone Substrate.

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Researchers developed high-density micro-electrocorticographic electrode arrays and a multiplexing integrated circuit for brain signal recording. This technology enables simultaneous, finely-localized electrophysiological recordings across wide brain areas with a reduced invasive footprint.

Keywords:
actively multiplexedflexible substrateimplanted deviceneural interfaceμECoG

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • Simultaneous brain-wide electrical signal recording is crucial for neuroscience research and understanding neurological disorders.
  • Existing devices often lack the required conformal interfaces, spatial resolution, and chronic recording capabilities for large cortical regions.
  • A need exists for minimally invasive devices with high channel density and chronic recording capabilities.

Purpose of the Study:

  • To design and develop high-density micro-electrocorticographic (μECoG) electrode arrays for large-area brain recording.
  • To create a custom multiplexing integrated circuit (IC) to reduce the number of external connections.
  • To demonstrate the feasibility of the integrated system for in vivo electrophysiological signal sensing.

Main Methods:

  • Designed 61-channel and 48-channel μECoG arrays with 400 μm pitch on ultra-soft substrates.
  • Developed a custom multiplexing IC and a water-tight packaging method using liquid crystal polymer.
  • Established a micro-bonding technique for attaching the electronics package to the electrode array.
  • Conducted in vivo testing in a rat model.

Main Results:

  • Successfully designed and fabricated high-density μECoG arrays and a functional multiplexing IC.
  • Demonstrated a significant reduction in external wire connections (to 16 wires) due to the integrated multiplexer.
  • Validated the ability of the electrode array and IC to sense finely-localized electrophysiological signals in vivo in rats.

Conclusions:

  • The developed μECoG system offers a promising solution for high-density, large-area brain recording with reduced invasiveness.
  • The integrated multiplexing IC and robust packaging are key innovations for chronic implantation.
  • This technology has the potential to advance neuroscience research and the development of treatments for neurological disorders.