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Sensors 2018, 18(9), 3015; https://doi.org/10.3390/s18093015

Noncontact Strain Monitoring of Osseointegrated Prostheses

1
Department of Structural Engineering, University of California-San Diego, La Jolla, CA 92093-0085, USA
2
Material Science and Engineering Program, University of California-San Diego, La Jolla, CA 92093-0085, USA
3
Elintrix, Escondido, CA 92029, USA
*
Author to whom correspondence should be addressed.
Received: 24 June 2018 / Revised: 12 August 2018 / Accepted: 6 September 2018 / Published: 9 September 2018
(This article belongs to the Special Issue Noncontact and Unobtrusive Biomedical Sensors 2018)
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Abstract

The objective of this study was to develop a noncontact, noninvasive, imaging system for monitoring the strain and deformation states of osseointegrated prostheses. The proposed sensing methodology comprised of two parts. First, a passive thin film was designed such that its electrical permittivity increases in tandem with applied tensile loading and decreases while unloading. It was found that patterning the thin films could enhance their dielectric property’s sensitivity to strain. The film can be deposited onto prosthesis surfaces as an external coating prior to implant. Second, an electrical capacitance tomography (ECT) measurement technique and reconstruction algorithm were implemented to capture strain-induced changes in the dielectric property of nanocomposite-coated prosthesis phantoms when subjected to different loading scenarios. The preliminary results showed that ECT, when coupled with strain-sensitive nanocomposites, could quantify the strain-induced changes in the dielectric property of thin film-coated prosthesis phantoms. The results suggested that ECT coupled with embedded thin films could serve as a new noncontact strain sensing method for scenarios when tethered strain sensors cannot be used or instrumented, especially in the case of osseointegrated prostheses. View Full-Text
Keywords: carbon nanotube; electrical capacitance tomography; nanocomposite; noncontact; osseointegrated prosthesis; patterning; permittivity; strain sensing; thin film carbon nanotube; electrical capacitance tomography; nanocomposite; noncontact; osseointegrated prosthesis; patterning; permittivity; strain sensing; thin film
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gupta, S.; Lee, H.-J.; Loh, K.J.; Todd, M.D.; Reed, J.; Barnett, A.D. Noncontact Strain Monitoring of Osseointegrated Prostheses. Sensors 2018, 18, 3015.

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