Apparatus for Measuring the Swelling Dependent Electrical Conductivity of Charged Hydrated Soft Tissues

[+] Author and Article Information
W. Y. Gu, M. A. Justiz

Tissue Biomechanics Lab, Department of Biomedical Engineering, College of Engineering, University of Miami, Coral Gables, FL 33124

J Biomech Eng 124(6), 790-793 (Dec 27, 2002) (4 pages) doi:10.1115/1.1516571 History: Received May 01, 2001; Revised July 01, 2002; Online December 27, 2002
Copyright © 2002 by ASME
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Schematic representation of the four-wire method for measuring the resistance of hydrated soft tissue.
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Photograph of custom designed conductivity apparatus: (1) plexiglass chamber; (2) upper current electrode; (3) IVD specimen; (4) lower current electrode; (5) voltage-sensing Ag/AgCl electrode; (6) digital micrometer; (7) current-sensing circuit.
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Resistance of conductivity standard (0.1 M KCl, 11.82 mS/cm @20.6°C) measured by apparatus at different heights (mean±SD,n=5); linear theoretical curve shown for comparison.
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Linear correlation between specific conductivity and water content (volume fraction) for porcine AF specimens (58 measurements).




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