A foldable electrode array for 3D recording of deep-seated abnormal brain cavities.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Materials Science

Background:

• Deep-lying brain cavities, often resulting from stroke, present challenges for neural recording.
• Current neural implants may not be suitable for accessing and recording from the walls of these irregular cavities.

Purpose of the Study:

• To design and microfabricate a novel foldable thin-film neural implant.
• To investigate the implant's efficacy for electrical recording from deep brain cavity walls.

Main Methods:

• A foldable neural electrode array was microfabricated using UV-lithography and Reactive Ion Etching.
• The electrode's ability to unfold and record from rat brain cavity walls was demonstrated in vivo.
• Electrochemical characterization and CT imaging were used to validate performance.

Main Results:

• The foldable electrode successfully unfolded within brain cavities, contacting cavity walls.
• Electrochemical tests confirmed the electrode's suitability for in vivo application.
• Analysis of recorded local field potentials demonstrated the ability to capture neural signals.

Conclusions:

• The study confirms the feasibility of recording neural activity from within brain cavities using a single implantation.
• This technology offers new avenues for researching abnormal brain cavities and associated conditions, such as central post-stroke pain.