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Inkjet-Printed Neural Electrodes with Mechanically Gradient Structure.

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We developed flexible neural probes using inkjet-printing technology for stable in vivo spike recording. These novel probes demonstrate effective signal acquisition from the mouse thalamus.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Neuroscience

Background:

  • Flexible materials are crucial for developing neural probes capable of stable in vivo electrophysiological recordings.
  • Existing neural probe technologies face challenges in achieving long-term signal stability and biocompatibility.

Purpose of the Study:

  • To present inkjet-printed, flexible neural probes for high-fidelity spike recording in vivo.
  • To demonstrate the utility of polymeric thin films and nanoinks in constructing advanced neural interfaces.

Main Methods:

  • Neural probes were fabricated using 400 nm-thick poly(d,l-lactic acid) nanofilms.
  • Inkjet printing was employed to deposit gold (Au) and poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) nanoinks.
  • Microelectrodes were exposed, and probes were designed with a gradual increase in stiffness for seamless connection to external amplifiers.

Main Results:

  • The 6 μm-thick flexible probes successfully recorded neural spikes from the mouse thalamus in vivo.
  • The needle-shaped probe design facilitated insertion and stable recording.
  • The gradual stiffness gradient ensured reliable signal transmission to external amplifiers.

Conclusions:

  • Inkjet-printed flexible neural probes offer a promising platform for stable in vivo spike recording.
  • The fabrication method using polymeric thin films and nanoinks is effective for creating advanced neural interfaces.
  • This technology has significant potential for advancing neuroscience research and clinical applications.