Extracellular matrix-based intracortical microelectrodes: Toward a microfabricated neural interface based on natural...

Area of Science:

• Biomaterials Science
• Neuroscience
• Medical Devices

Background:

• Implantable neural electrodes (NEs) are crucial for neuroscience research and clinical applications.
• Traditional NEs often trigger significant inflammatory responses due to material incompatibility.
• Developing biocompatible NEs that minimize tissue damage is a key challenge.

Purpose of the Study:

• To develop novel implantable neural electrodes (NEs) utilizing extracellular matrix (ECM) as a natural substrate.
• To evaluate the mechanical properties and biocompatibility of ECM-based NEs.
• To assess the performance of ECM-NEs in vivo for neural recording.

Main Methods:

• Microfabrication of NEs on natural-substrate-based organic materials (ECM).
• Characterization of NE mechanical properties, including rigidity for insertion and softening in physiological conditions.
• Assessment of inflammatory response in brain tissue compared to conventional NEs.
• In vivo intracortical recordings in the rat motor cortex.

Main Results:

• Successfully fabricated ECM-based NEs with tunable mechanical properties.
• ECM-NEs demonstrated reduced inflammatory responses compared to inorganic rigid and flexible NEs.
• Implants softened to match brain tissue's elastic modulus, reducing strain fields.
• Effective in vivo intracortical recordings were achieved in the rat motor cortex.

Conclusions:

• ECM-based NEs offer a promising biomaterial approach for neural implants.
• This design minimizes foreign body response and improves tissue integration.
• ECM-NEs represent a significant advancement in developing less invasive and more effective neural interfaces.