NDLI: Seat cushion design for elderly wheelchair users based on minimization of soft tissue deformation using stiffness and pressure measurements

Content Provider	IEEE Xplore Digital Library
Author	Brienza, D.M. Karg, P.E. Brubaker, C.E.
Copyright Year	1993
Abstract	A method for designing seat support surfaces using interface pressure and soft tissue stiffness criteria was evaluated. An algorithm designed to drive a rigid support surface on a programmable seating system to a shape for which the externally applied pressure is inversely related to the measured stiffness of adjacent soft tissue was evaluated on 30 elderly subjects (age 65 years or older). The resulting support surface shapes were transferred to compliant foam cushions and evaluated using interface pressure measurements. Pressure and stiffness measurements on the seating system indicated the surface shape control algorithm met the desired programmed criteria by achieving an inverse relationship between pressure and stiffness, as it converged to an "optimal" support surface shape. Evaluation of interface pressures on the compliant foam cushions showed that the pressure distributions on the cushions contoured to the optimal surface shapes were more uniform and had lower values than distributions on flat foam cushions and foam cushions contoured to shapes measured using state-of-the-art load-deflection devices. The results suggest that support surfaces designed using tissue stiffness as a criteria can provide loading conditions intended to minimize relative deformation and, thus, stress in load-bearing soft tissue.
Sponsorship	IEEE Computer Society
Starting Page	320
Ending Page	327
Page Count	8
File Size	1284182
File Format	PDF
ISSN	10636528
Volume Number	4
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-12-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Senior citizens Wheelchairs Biological tissues Shape measurement Pressure measurement Minimization methods Shape control Medical services Buttocks Humans
Content Type	Text
Resource Type	Article
Subject	Engineering

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