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Development of a Microfabricated Flat Interface Nerve Electrode Based on Liquid Crystal Polymer and Polynorbornene Multilayered Structures

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4 Author(s)
Allison E. Hess ; Electrical Engineering Department, Case Western Reserve University, OH, 44106 USA. e-mail: ; Jeremy Dunning ; Dustin Tyler ; Christian A. Zorman

This paper reports on the development of a mechanically-flexible microfabricated flat interface nerve electrode using liquid crystal polymer (LCP) and polynorbornene (PNB) as the structural materials. The device consists of two electrode arrays each fabricated on a LCP base with thin film Pt electrodes and a photolithographically patterned PNB capping layer. The two arrays are inserted into a silicone housing designed to create a flat interface between the electrodes and the nerve bundle. Electrical tests showed that the resistance of the thin film Pt electrode interconnect traces are unaffected by flexing around a 1.5 mm radius. Electrical testing in PBS shows that the resistance of the traces is about 1 kOmega. A 10 day leakage current test in PBS indicates that the PNB absorbs moisture but still maintains its insulating behavior. These and other tests indicate that the LCP/PNB multilayer may be a viable material system for microfabricated electrodes.

Published in:

2007 3rd International IEEE/EMBS Conference on Neural Engineering

Date of Conference:

2-5 May 2007