Focused Ion Beam Lithography to Etch Nano-architectures into Microelectrodes

Area of Science:

• Neuroscience
• Biomaterials Engineering
• Medical Device Technology

Background:

• Intracortical microelectrodes are crucial for neuroscience research and clinical applications.
• Advances in fabrication technology have led to more sophisticated microelectrodes.
• Current electrodes can elicit neuroinflammatory responses, limiting their long-term efficacy.

Purpose of the Study:

• To describe a protocol for creating biomimetic nano-architectures on intracortical microelectrodes.
• To investigate the potential of nano-architectures to improve electrode biocompatibility and functionality.
• To demonstrate the post-manufacturing modification capabilities of focused ion beam lithography.

Main Methods:

• Utilized focused ion beam lithography (FIB) to etch nano-architecture features onto microelectrode surfaces.
• Applied the protocol to both functional and non-functional single shank intracortical microelectrodes.
• Focused on modifying existing manufactured devices rather than during initial fabrication.

Main Results:

• Nano-architectures etched onto electrode surfaces showed potential for improved biocompatibility.
• The modifications suggested enhanced functionality of the implanted devices.
• Focused ion beam lithography allows for post-manufacturing customization of medical devices.

Conclusions:

• Biomimetic nano-architectures, created using FIB, offer a promising approach to enhance intracortical microelectrodes.
• This technique can improve device integration with brain tissue and reduce adverse inflammatory responses.
• The protocol is adaptable for various materials, nano-architectures, and device types, offering broad applicability.