Triaxial force transducer for investigating stresses at the stump/socket interface |
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Authors: | R B Williams D Porter V C Roberts J F Regan |
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Institution: | (1) Department of Medical Engineering & Physics, King's College School of Medicine, Denmark Hill, SE5 8RX London, UK;(2) Limb Fitting Centre, Chas. A. Blatchford & Sons Ltd., Roehampton Lane, SW15 London, UK |
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Abstract: | Although normal pressures at the stump socket interface of the lowerlimb amputee have been investigated, little is known about
the shear stresses that also occur. Studies suggest that the combination of both shear and normal stresses significantly exacerbates
discomfort and vascular and tissue damage. A means of simultaneously measuring normal and shear stresses will aid in the investigation
and improvement of prosthetic fit. A miniature triaxial force transducer (4·9×16 mm diameter) has been developed which can
be recessed into the socket wall. The principle of operation, construction, performance and limitations of the device are
described. Preliminary measurements of the interface stress variations over the gait cycle in a supra-condylar PTB socket
are presented. These show clear differences in the stress patterns present when two different prosthetic feet are used. |
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Keywords: | Lower-limb amputee Pressure Prosthetic interface Shear stress Transducer |
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