PDMS-based conformable microelectrode arrays with selectable novel 3-D microelectrode geometries for surface...

Area of Science:

• Biomedical Engineering
• Materials Science
• Neuroscience

Background:

• Microelectrode arrays (MEAs) are crucial for neural interfaces.
• Current MEA fabrication methods often limit electrode geometry and performance.
• Polydimethylsiloxane (PDMS) offers biocompatibility and flexibility for MEAs.

Purpose of the Study:

• To present a novel fabrication method for polydimethylsiloxane (PDMS) based conformable microelectrode arrays (MEAs).
• To introduce selectable, novel 3-D microelectrode geometries for enhanced performance.
• To enable independent control over 3-D microelectrode geometry parameters.

Main Methods:

• Fabrication of MEAs using PDMS.
• Development of methods to create recessed (simply, conically, exponentially) and protruded-well microelectrode geometries.
• Independent control of recess depth, slope, profile, and protrusion during fabrication.
• Achieved microelectrode diameters as small as 10 micrometers.

Main Results:

• Successfully fabricated MEAs with various 3-D microelectrode geometries.
• Demonstrated independent control over key geometric parameters.
• Identified conically and exponentially recessed electrodes as promising for uniform current density.
• Protruded-well electrodes showed potential for improved contact and efficiency.

Conclusions:

• The presented method allows for precise fabrication of 3-D microelectrode geometries in PDMS MEAs.
• Novel geometries like recessed and protruded-well electrodes offer significant advantages for stimulation applications.
• These advancements hold promise for improving chronic stimulation, neural prostheses, and overall stimulation efficiency.