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Chronic Implantation of Multiple Flexible Polymer Electrode Arrays
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Advances in flexible high-density microelectrode arrays for brain-computer interfaces.

Seunghyeb Ban1, David Chong1, Junwoo Kwon2

  • 1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA; Wearable Intelligent Systems and Healthcare Center (WISH Center) at the Institute for Matter and Systems, Georgia Institute of Technology, Atlanta, GA, 30332, USA.

Biosensors & Bioelectronics
|October 16, 2025
PubMed
Summary
This summary is machine-generated.

Flexible high-density microelectrode arrays (FHD-MEAs) enhance brain-computer interfaces (BCIs) by overcoming limitations of rigid arrays. This review highlights their potential for advanced neural recording, stimulation, and clinical applications.

Keywords:
Bidirectional brain-computer interfacesFlexible high-density microelectrode arraysNeural signal acquisitionNeural stimulationWearable implantable bioelectronics

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • Conventional low-density, rigid brain-computer interface (BCI) arrays face challenges including poor spatial resolution, instability, and electrochemical degradation.
  • These limitations hinder effective neural recording and stimulation for clinical applications.

Purpose of the Study:

  • To review recent advances in flexible high-density microelectrode arrays (FHD-MEAs) for brain-computer interfaces (BCIs).
  • To outline challenges of conventional BCI systems and how FHD-MEAs address them.
  • To summarize applications and translational potential of FHD-MEAs in clinical therapy and human-machine interfaces.

Main Methods:

  • Review of literature on flexible high-density microelectrode arrays (FHD-MEAs).
  • Analysis of challenges associated with conventional rigid BCI systems.
  • Summary of advancements in materials, device design, and system integration for FHD-MEAs.
  • Compilation of representative applications in clinical therapy and human-machine interfaces.

Main Results:

  • Flexible high-density microelectrode arrays (FHD-MEAs) offer high spatial resolution, mechanical compliance, and biocompatibility, surpassing rigid BCI arrays.
  • FHD-MEAs overcome issues like micro-motor instability, electrochemical degradation, wiring bottlenecks, and charge injection hazards.
  • Demonstrated applications include sensory enhancement, advanced human-machine interfaces, and treatments for neurological diseases.

Conclusions:

  • FHD-MEAs represent a significant advancement for next-generation brain-computer interfaces (BCIs).
  • This technology provides a crucial foundation for clinically viable neural recording and stimulation.
  • Emerging trends indicate substantial translational potential for diverse neurological and assistive applications.