MEMS-Actuated Carbon Fiber Microelectrode for Neural Recording

Area of Science:

• Neuroscience
• Biomedical Engineering
• Materials Science

Background:

• Cortical neural recording arrays often have limited single-unit activity due to insufficient proximity of recording sites to neurons.
• Existing precise electrode insertion methods can cause adverse biological responses.
• Carbon fiber microelectrodes offer potential for neural recording with reduced tissue damage.

Purpose of the Study:

• To develop and demonstrate an electrostatic-based actuator for controlled insertion of individual microelectrodes.
• To investigate the biological response elicited by electrodes inserted using the electrostatic method.
• To establish a versatile platform for advanced neural recording techniques.

Main Methods:

• Design and fabrication of an electrostatic actuator for microelectrode manipulation.
• Insertion of carbon fiber microelectrodes into an agar brain phantom.
• Testing of electrode functionality by recording artificial neural signals in saline.

Main Results:

• The electrostatic actuator successfully inserted individual carbon fiber microelectrodes.
• Electrodes inserted via this method elicited minimal to no adverse biological response.
• Artificial neural signals were successfully recorded using the inserted electrodes.

Conclusions:

• The electrostatic actuator provides a precise and biocompatible method for neural electrode insertion.
• This technology offers a generalizable platform for various microwire-based neural recording applications.
• The developed technique has the potential to enhance the efficacy and reduce the invasiveness of neural interfaces.