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A Polyimide Pressure-Contact Multielectrode Array for Implantation Along a Submillimeter Neural Process in Small Animals

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2 Author(s)
Lott, G.K. ; Howard Hughes Med. Inst., Ashburn, VA ; Hoy, R.R.

We describe a microelectrode system for recordings from nerve bundles with diameters ranging from 20-200 mum. A novel polyimide structure allows for a planar microfabricated device to constrain a free neural process against several recording sites. This polyimide array contains multiple zigzag vias through which a small nerve process may be woven while remaining functionally intact in a live preparation. Our electrode construct features the benefits of nerve cuffs (evenly spaced electrodes in a polymer) and the functionality of a nerve hook (ability to connect to submillimeter processes). The device records extracellular action potentials in the red-swamp crayfish, Procambarus clarkii. Action potential propagation is monitored at several sites along a constrained nerve in this model organism's peripheral nervous system. Details of temporal accuracy and error sources in absolute conduction velocity measurements from microelectrode arrays are discussed.

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Biomedical Engineering, IEEE Transactions on  (Volume:55 ,  Issue: 6 )