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Vol. 34, No. 8(3), S&M3042

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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Sensors and Materials, Volume 17, Number 3 (2005)
Copyright(C) MYU K.K.
pp. 139-153
S&M593 Research Paper of Special Issue
Published: 2005

Fabrication and Evaluation of a Flexible Sieve-Type Microelectrode Array for Monitoring the Regenerating State of Peripheral Nerves [PDF]

Yong-Ho Kim, Chung-Kun Lee, Yong-Jun Kim and Myoungho Lee

(Received April 10, 2004; Accepted December 21, 2004)

Keywords: flexible microelectrode array, peripheral nerves, polyimide, ‘stress-free etch release,’ in vivo, in vitro

This paper reports the design, fabrication and measurement of a flexible microelectrode array for monitoring the regenerating state of peripheral nerves. Polyimide was used so that the device would have biocompatibility, long-term stability and flexibility. Using a ‘stress-free etch-release’ scheme, it was possible to fabricate a microelectrode array with a smaller feature size because less geometrical deviation took place compared to that using a mechanical peeling-off method. The diameter of the via holes, which provide a path for regenerating nerve fibers, was 40 m and 50 m. In vivo tests were performed by implanting fabricated microelectrode arrays into the sciatic nerves of a rat and into the peroneal nerves of a rabbit using two different implantation methods. One is a direct inter- fascicular suture technique and the other is a method using a nerve conduit. In both cases, no side effects such as cytotoxicity, neuroma and antigen-antibody reaction were observed. In vitro measurement was carried out to confirm the feasibility of measuring nerve signals. The interfacial impedance between body fluids and microelectrodes was measured. The normalized interfacial impedance was 446 /m2 at 1 kHz. Signal transfer characteristics were analyzed by applying square waves of various frequencies and magnitudes.

Corresponding author: Myoungho Lee


Cite this article
Yong-Ho Kim, Chung-Kun Lee, Yong-Jun Kim and Myoungho Lee, Fabrication and Evaluation of a Flexible Sieve-Type Microelectrode Array for Monitoring the Regenerating State of Peripheral Nerves, Sens. Mater., Vol. 17, No. 3, 2005, p. 139-153.



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