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Environmental Dynamic Mechanical Analysis to Predict the Softening Behavior of Neural Implants
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An Immunocompatible Conductive Polymer for Long-Term Bioelectronic Implants.

Xianchi Zhou1,2, Zihao Zhu2, Wenbin Dai2

  • 1State Key Laboratory of Transvascular Implantation Devices, Department of Cardiology, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 311202, P. R. China.

Journal of the American Chemical Society
|October 10, 2025
PubMed
Summary

A new conductive polymer, PEDOT-TMO, offers superior biocompatibility for neural implants. This material significantly reduces immune response and inflammation, enabling longer, more reliable recording of brain signals.

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Immunology

Background:

  • Tissue-electronic interfaces are crucial for neural implants and bioelectronic devices.
  • Host immune responses to implanted electrodes limit device performance and longevity.
  • Developing immunocompatible yet conductive materials is a key challenge.

Purpose of the Study:

  • To identify and evaluate a novel conductive polymer for enhanced biocompatibility in bioelectronic implants.
  • To assess the inflammatory and fibrotic responses to the new polymer compared to conventional materials.
  • To determine the long-term performance of electrodes coated with the new polymer in vivo.

Main Methods:

  • Screening of PEDOT derivatives functionalized with immunoregulatory moieties.
  • In vivo subcutaneous implantation in mice to assess acute and chronic inflammation.
  • In vivo brain implantation in freely moving rats to evaluate long-term electrophysiological signal recording.
  • Analysis of S100A9 expression in brain tissue.

Main Results:

  • PEDOT-TMO/PSS coatings demonstrated reduced acute inflammation and chronic fibrotic response compared to PEDOT/PSS.
  • Silicon electrodes coated with PEDOT-TMO/PSS reliably recorded electrophysiological signals for at least 8 weeks in rat brains.
  • PEDOT-TMO/PSS coatings significantly reduced S100A9 expression in surrounding brain tissue.
  • Pharmacological inhibition of S100A9 also attenuated tissue responses to implants.

Conclusions:

  • PEDOT-TMO is a promising immunocompatible conductive polymer for long-term bioelectronic implants.
  • This material can enhance device longevity and performance by mitigating local immune responses.
  • Targeting S100A9 presents a potential strategy for neuroinflammation inhibition in brain implants.