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Insertion of Flexible Neural Probes Using Rigid Stiffeners Attached with Biodissolvable Adhesive
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Peptide-based coatings for flexible implantable neural interfaces.

Martina Righi1, Gian Luigi Puleo2, Ilaria Tonazzini3

  • 1The BioRobotics Institute, Scuola Superiore Sant'Anna, Viale Rinaldo Piaggio 34, 56025, Pontedera (PI), Italy. martina.righi@santannapisa.it.

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Researchers developed a novel peptide coating for polyimide (PI) thin-film electrodes to improve neural signal quality. This easy-to-implement coating supports neuronal growth and glial cell viability, reducing fibroblast contamination for better biosensor performance.

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Medical Devices

Background:

  • Flexible biosensors, particularly polyimide (PI) thin-film electrodes, are increasingly used in neuroprosthetics.
  • A major challenge is the suboptimal tissue-device interface, which degrades long-term neural signal quality.
  • Current surface modification strategies are often complex, difficult to integrate with micro-fabrication, and require extensive testing.

Purpose of the Study:

  • To design and in vitro test an easily implementable peptide coating for thin-film electrodes.
  • To enhance the biocompatibility and performance of PI-based neural interfaces.
  • To develop a new generation of peptide-coated electrodes for improved neuroprosthetic applications.

Main Methods:

  • Functionalization of polyimide sheets with vinyl (PI_v) and amino (PI_a) groups.
  • Covalent conjugation of a laminin-derived peptide, CAS-IKVAV-S (IKV), onto functionalized PI sheets.
  • In vitro evaluation of engineered coatings (PI_v+IKV and PI_a+IKV) for neuronal adhesion, neurite sprouting, glial cell viability, and fibroblast contamination.

Main Results:

  • Both PI_v+IKV and PI_a+IKV coatings demonstrated suitable morphological and chemical properties.
  • The engineered coatings supported neuronal adhesion and neurite sprouting.
  • Both coatings enhanced peripheral glial cell viability while reducing fibroblast contamination.
  • The PI_v+IKV coating exhibited particularly promising results.

Conclusions:

  • The developed peptide coating is an easy-to-implement approach to improve thin-film electrode interfaces.
  • The PI_v+IKV coating shows significant potential for supporting neural integration and signal quality.
  • These findings encourage further in vivo investigation and suggest a new generation of peptide-coated electrodes.