μ-Foil Polymer Electrode Array for Intracortical Neural Recordings.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Materials Science

Background:

• Developing advanced neural probes is crucial for understanding brain function.
• Existing electrode arrays face challenges in tissue integration and signal fidelity.

Purpose of the Study:

• To evaluate the technical aspects and performance of a novel multichannel electrode array, the "[Formula: see text]"-foil.
• To assess its suitability for neural recordings in acute in vitro and in vivo settings.

Main Methods:

• Fabrication of an ultrathin, flexible electrode array with barb-like protrusions.
• Electroplating active sites with platinum black to reduce interface impedance.
• Tailoring electrode protrusion distance to match rat cerebral cortex architecture.
• Conducting acute in vitro and in vivo experiments for performance evaluation.

Main Results:

• Reduced interface impedance by up to two orders of magnitude through platinum black electroplating.
• Achieved reduced phase lag for higher frequency components.
• Demonstrated high signal-to-noise ratio in acute in vivo neural recordings.
• Confirmed no significant crosstalk between recording channels.

Conclusions:

• The "[Formula: see text]"-foil electrode array shows promising technical performance for neural recording.
• Its design facilitates tissue integration and enhances signal quality.
• Further research is warranted for chronic implantation and long-term studies.