Photosensitive-polyimide based method for fabricating various neural electrode architectures.

Area of Science:

• Neuroscience
• Materials Science
• Biomedical Engineering

Background:

• Developing advanced neural electrodes is crucial for improving electrophysiological recordings and integrating multi-functional capabilities.
• Current fabrication methods for neural electrodes often lack design flexibility and can be time-consuming, limiting their application.
• Photosensitive polyimides (PSPI) offer potential for microfabrication due to their tunable properties.

Purpose of the Study:

• To develop and characterize a PSPI-based fabrication method for diverse neural electrode architectures.
• To enhance design flexibility and fabrication capabilities for neural electrodes.
• To improve the quality of recorded neural signals and enable integration of additional functions.

Main Methods:

• Characterization of PSPI properties for micromachining processes.
• Design and fabrication of various neural electrodes, including electrocorticogram (ECoG), mesh intracortical, and guide cannula electrodes.
• Fabrication on non-flat substrates using PSPI as the sole insulation material, avoiding dry etching.

Main Results:

• Successful fabrication of diverse neural electrode architectures using a single PSPI material.
• Demonstrated fabrication on non-flat substrates, expanding application possibilities.
• In vivo neural recordings in rats showed repeated, stable neural activity recording without mechanical failure.

Conclusions:

• The PSPI-based fabrication method provides significant design flexibility and ease of optimization for neural electrode architectures.
• This technique enables improved neural recording performance and promises stable, long-term electrophysiological research.
• The developed method is a powerful tool for various electrophysiological experimental research applications.