An interfacial stress sensor for biomechanical applications

This paper presents a capacitive sensor that measures interfacial forces in prostheses and is promising for other biomedical applications. These sensors can be integrated into prosthetic devices to measure both normal and shear stress simultaneously, allowing for the study of prosthetic limb fit, an...

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Bibliographic Details
Published in:Measurement science & technology 2012-08, Vol.23 (8), p.85701-1-10
Main Authors: Sundara-Rajan, K, Bestick, A, Rowe, G I, Klute, G K, Ledoux, W R, Wang, H C, Mamishev, A V
Format: Article
Language:English
Subjects:
biomechanical interfaces
capacitive sensor
Construction
Electrodes
interfacial stress
Loads (forces)
pressure
prosthesis
Prosthetic devices
Prosthetics
sensor fabrication
Sensors
Shear
Shear stress
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Summary:This paper presents a capacitive sensor that measures interfacial forces in prostheses and is promising for other biomedical applications. These sensors can be integrated into prosthetic devices to measure both normal and shear stress simultaneously, allowing for the study of prosthetic limb fit, and ultimately for the ability to better adapt prosthetics to individual users. A sensing cell with a 1.0 cm2 spatial resolution and a measurement range of 0-220 kPa of shear and 0-2 MPa of pressure was constructed. The cell was load tested and found to be capable of isolating the applied shear and pressure forces. This paper discusses the construction of the prototype, the mechanical and electrode design, fabrication and characterization. The work presented is aimed at creating a class of adaptive prosthetic interfaces using a capacitive sensor.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/23/8/085701