Microfabricated intracortical extracellular matrix-microelectrodes for improving neural interfaces.

Area of Science:

• Neuroscience
• Biomaterials Science
• Bioengineering

Background:

• Intracortical neural microelectrodes are vital for neuroscience research and brain computer interfaces (BCI).
• Clinical use is limited by inflammatory responses and poor neuronal survival at electrode interfaces.
• Existing devices struggle to mitigate foreign body responses in neural tissue.

Purpose of the Study:

• To develop novel microelectrodes using extracellular matrix (ECM) proteins to improve biocompatibility and neuronal integration.
• To overcome limitations of current microelectrodes in supporting neuronal survival and reducing neuroinflammation.
• To create microelectrodes suitable for advanced neuroscience research and clinical BCI applications.

Main Methods:

• Fabrication of microelectrodes primarily composed of ECM proteins using micro-transfer-molding and excimer laser micromachining.
• Integration with a removable insertion stent for improved intracortical implantation.
• Electrochemical modeling and in vivo recordings in rat cortex to assess performance and biocompatibility.

Main Results:

• ECM-microelectrodes demonstrated electrochemical impedance characteristics comparable to commercial devices at relevant frequencies.
• High neuronal viability, dense neuronal somata, and neurite growth were observed on ECM-microelectrode surfaces.
• Markedly diminished neuroinflammation and glial scarring were evident in early chronic implantation studies in rats.

Conclusions:

• ECM-microelectrodes represent a promising advancement for neural interfacing, enhancing biocompatibility and neuronal integration.
• These novel devices show potential to overcome key limitations hindering clinical translation of neural implants.
• The developed ECM-microelectrodes offer a pathway towards more effective and long-term neural recording and stimulation for BCI and research.