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Medical & Biological Engineering & Computing

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01-02-2013 | Original Article

Geometry-based optimization of radio-frequency coils for powering neuroprosthetic implants

Authors: Jungsuk Kim, Eric Basham, Kenneth D. Pedrotti

Published in: Medical & Biological Engineering & Computing | Issue 1-2/2013

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Abstract

Biomedical implants powered by inductive links have several advantages over batteries or percutaneous power linkages. The inductive link power transfer efficiency must be optimized to realize the full advantage over other power delivery technologies. Optimization is also important to reduce the electromagnetic radiation exposure, reduce secondary heating effects and improve power efficiency, so that large primary side storage batteries are not required. Geometric constraints, i.e., size and shape, of biomedical implants are a primary concern of device design. In this paper, we present a novel coil optimization strategy driven by geometric constraints. By considering the relationship between wire diameter, number of turns, quality factor, coupling coefficient and shape of coil, we can optimize the inductively coupled coils to maximize the power transfer efficiency under stringent geometric constraints. This new approach is verified using a design example targeted for an intraocular visual prosthesis. In this example, we demonstrate an experimental power transfer efficiency of 52 % by co-optimization of the primary and secondary coils.

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Title: Geometry-based optimization of radio-frequency coils for powering neuroprosthetic implants
Authors: Jungsuk Kim
Eric Basham
Kenneth D. Pedrotti
Publication date: 01-02-2013
Publisher: Springer-Verlag
Published in: Medical & Biological Engineering & Computing / Issue 1-2/2013
Print ISSN: 0140-0118
Electronic ISSN: 1741-0444
DOI: https://doi.org/10.1007/s11517-012-0975-8

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