Noncontact Strain Monitoring of Osseointegrated Prostheses

Sensors

MichaelD. Todd¹  KennethJ. Loh¹  Sumit Gupta¹  Joseph Reed²  A.Drew Barnett²  Han-Joo Lee³ 

[1] Department of Structural Engineering, University of California-San Diego, La Jolla, CA 92093-0085, USA;Elintrix, Escondido, CA 92029, USA;Material Science and Engineering Program, University of California-San Diego, La Jolla, CA 92093-0085, USA;

关键词: carbon nanotube;    electrical capacitance tomography;    nanocomposite;    noncontact;    osseointegrated prosthesis;    patterning;    permittivity;    strain sensing;    thin film;   

DOI  :  10.3390/s18093015

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown