Theoretical Analysis of an Implantable Force Transducer for Tendon and Ligament Structures

[+] Author and Article Information
W. S. Xu, D. L. Butler, D. C. Stouffer, E. S. Grood, D. L. Glos

Noyes-Giannestras Biomechanics Laboratory, Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, Ohio 45221-0048

J Biomech Eng 114(2), 170-177 (May 01, 1992) (8 pages) doi:10.1115/1.2891368 History: Received November 05, 1990; Revised October 01, 1991; Online March 17, 2008


A mathematical model was developed for an implantable force transducer to be inserted within the midsubstance of a ligament or tendon. The model was generated by performing both equilibrium and strain-displacement analyses on a metallic, curved beam structure placed within a parallel-fibered tissue. The analysis permitted the transverse pressure acting between the device and fibers to be calculated along with peak device strain and sensitivity (ratio of strain output to axial tissue force). Transducer pressure and transducer strain were expressed in terms of nondimensionalized design factors. A parametric analysis of the key design factors was then performed. The transverse pressure was shown to vary little for large changes in these factors whereas device strain changed markedly. The analysis was verified by a bench test on an example device. Such a model permits a proposed design to be evaluated without having to conduct costly experiments.

Copyright © 1992 by The American Society of Mechanical Engineers
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