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research-article

Evaluation of Force Sensing Resistors for the Measurement of Interface Pressures in Lower Limb Prosthetics

[+] Author and Article Information
Eric Swanson

Department of Bioengineering, University of Washington, Seattle, WA 98195
eswanso3@uw.edu

Ethan Weathersby

Department of Bioengineering, University of Washington, Seattle, WA 98195
ethanw3@uw.edu

John Cagle

Department of Bioengineering, University of Washington, Seattle, WA 98195
jcagle23@gmail.com

Joan E Sanders

Department of Bioengineering, University of Washington, Seattle, WA 98195
jsanders@uw.edu

1Corresponding author.

ASME doi:10.1115/1.4043561 History: Received October 18, 2018; Revised April 18, 2019

Abstract

Understanding pressure distributions at the limb-socket interface is essential to the design and evaluation of prosthetic components for lower limb prosthesis users. Force sensing resistors (FSRs) are employed in prosthetics research to measure pressure at this interface due to their low cost, thin profile, and ease of use. While FSRs are known to be sensitive to many sources of error, few studies have systematically quantified these errors using test conditions relevant to lower limb prosthetics. The purpose of this study was to evaluate FSR accuracy for the measurement of lower limb prosthetics interface pressures. Two FSR models (Flexiforce A201 and Interlink 402) were subjected to a series of prosthetic-relevant tests. These tests included: (1) static compression, (2) cyclic compression, and (3) a combined static and cyclic compression protocol mimicking a variable activity (Walk-Sit-Stand) procedure. Flexiforce sensors outperformed Interlink sensors and were then subjected to two additional tests: (4) static curvature and (5) static shear stress. Results demonstrated that FSRs experienced significant errors all five tests. We concluded that: (1) if used carefully, FSRs can provide an estimate of prosthetic interface pressure, but these measurements should be interpreted within the expected range of possible measurement error given the setup; (2) FSRs should be calibrated in a setup that closely matches how they will be used for taking measurements; and (3) both Flexiforce and Interlink sensors can be used to estimate interface pressures, however in most cases Flexiforce sensors are likely to provide more accurate measurements.

Copyright (c) 2019 by ASME
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