Carbon-fiber based microelectrode array for intracortical neural recording

Carbon-fiber based microelectrode array for intracortical neural recording
Neural probe; Neural engineering; Chronic implant
Issue Date
Society for neuroscience
Microelectrode arrays are commonly used for electrophysiological recording from individual neurons to study neural pathways in the brain or to develop brain-computer int erface. However, the long-term recording is still limited due to the tissue reaction around the implanted microelectrodes even though the chronic neural recording is becoming more and more essential for long-term applications. It is believed that the geometry of the electrode such as the size is the most critical component which can determine the degree of the chronic tissue damage. In this study, in order to reduce the reactive tissue response, carbon fiber-based microelectrode arrays are developed. Since the diameter of the carbon fiber (7 μm in diameter) is much smaller than the conventional micro-wires, it is expected that the carbon fiber neural probe is appropriate for the long-term neural recording. We introduce the multi-channel microelectrode array whose channels are composed of multiple carbon fiber bundles and show the preliminary neural responses recorded in motor cortex of anesthetized rat. While each carbon fiber is too flexible to be inserted in the rat brain, the bundle of carbon fibers can sustain each other to insert the electrode into the brain.
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