Development of a large area high resolution micro ECoG electrode array

DESCRIPTION provided by applicant This work is directed at the development of a microelectrode array for electrocorticography ECoG that allows the recording and stimulation of neural activity on the surface of the brain over a large area at high spatial resolution Existig technologies either allow the recording of neural activity i over a large brain area at low spatil resolution standard commercial ECoGs or ii over a small brain area at high spatial resolution so called ECoGs BMSEED aims to produce large area high resolution ECoG electrode arrays lahr ECoGs Conventional ECoG electrode arrays are placed on the surface of the brain and are used as a less invasive alternative to penetrating microelectrodes which are inserted into the brain tissue They are used i in neuroscience research to explore the fundamentals of how the brain operates ii in brain machine interfaces BMIs to record neural activity to drive a neuroprosthesis for amputees or to move a computer cursor for the paralyzed and iii for monitoring neural activity during epilepsy surgery to identify the regions of the corex that generate seizures which subsequently are removed These applications would benefit from BMSEEDandapos s lahr ECoG because it would provide more accurate localization of the recorded signals i e normal neural activity as well as seizures over a large area thus improving brain research making BMIs more robust and improving clinical outcomes in epilepsy surgery by providing the neurosurgeon with more accurate localization of seizure activity In all ECOGs each recording electrode requires one wire to electrically connect to the data acquisition system without intersecting i e without shorting with other wires This becomes increasingly difficult as the density and total number of electrodes increases BMSEEDandapos s lahr ECoG solves this problem by routing the lead wires on multiple levels In addition our proprietary technology to produce mechanically robust microelectrodes using microfabrication techniques allows us to reduce the thickness thus the stiffness of the device making the implant more compliant Importantly BMSEEDandapos s lahr ECoG consists entirely of materials that are suitable for implantation in humans thus simplifying the FDA approval process The first specific aim is to optimize the profile of the slope between different levels to provide a reliable electrical connection and to fabricate and electromechanically characterize prototypes of the lahr ECoG The second aim is to demonstrate the biocompatibility and capabilities of the prototypes To that end a lahr ECoG will be chronically implanted in five cats and neural recording and micro stimulation data will be obtained for at least two months At the end of phase I BMSEED will have i developed the capability to produce multi level metallization and prototypes of lahr ECoGs and ii characterized their capabilities in a cat model In phase II BMSEED will extend the lahr ECoGs development to multi level metallization on larger clinically relevant substrate sizes Our customers will initially be research laboratories and after FDA approval biomedical companies for BMI applications and hospitals for clinical applications PUBLIC HEALTH RELEVANCE This work proposes the development of a microelectrode array for electrocorticography ECoG that allows the recording and stimulation of neural activity over a large area of the brain at a high spatial resolution This tool will provide improved methods for research on how the brain operates improve brain machine interfaces BMI to aid amputees and the paralyzed and improve clinical outcomes in epilepsy surgery by providing the neurosurgeon more accurate information about the location of seizure activity