Application of Parylene-Based Flexible Multi-Electrode Array for Recording From Subcortical Brain Regions From...

Area of Science:

• Neuroscience
• Biomaterials Science
• Neural Engineering

Background:

• Stable, chronic neural recordings are essential for understanding brain function and developing neural prosthetics.
• Micromotion between stiff implants and brain tissue triggers immune responses, limiting device longevity.
• A stiffness mismatch between implants and neural tissue is a key challenge in neural recording device design.

Purpose of the Study:

• To develop a flexible, polymer-based multi-electrode array to reduce stiffness mismatch with brain tissue.
• To enable stable, chronic single-unit recordings from the rat hippocampus.
• To investigate the potential of flexible arrays for improved neural recording device performance.

Main Methods:

• Fabrication of a flexible multi-electrode array using Parylene C as the structural and insulation material.
• Integration of 64 platinum recording electrodes on shanks designed to match hippocampal neuron distribution.
• Chronic implantation of the flexible multi-electrode array in three behaving rats.

Main Results:

• Successful chronic implantation and recovery in behaving rats.
• Acquisition of neural activity data from the rat hippocampus.
• Collection of neural activity alongside animal movement traces.

Conclusions:

• Flexible polymer-based neural probes can achieve stable, chronic recordings in the hippocampus.
• Reducing implant stiffness is a viable strategy to mitigate immune response and improve neural recording device longevity.
• This flexible array technology shows promise for advancing brain-computer interfaces and neuroscience research.