Document Detail

A pneumatic bladder array for measuring dynamic interface pressure between seated users and their wheelchairs.
MedLine Citation:
PMID:  2065148     Owner:  NLM     Status:  MEDLINE    
An understanding of the dynamic pressure distribution changes that take place on the sitting surface of a wheelchair while one propels oneself on a level surface may influence the design of wheelchair seat cushions engineered to minimize pressure sores in wheelchair users. A pneumatic pressure transducer array and associated multiplexer were developed to permit measurement of dynamic interfacial pressure changes on the seated wheelchair user during short bursts of locomotion on a level surface. The system design, calibration and interface to an IBM PC computer are described. Each transducer element consists of a 0.7" thick x 1.25" diameter bladder innervated by a miniature piezoresistive pressure transducer. Fifty elements make up the array covering a 7.5" x 15" area. The 50 differential outputs were multiplexed with six 16 to one CMOS analog switches and one 4-channel differential CMOS analog switch. A Keithley 570 data acquisition system was utilized. Frequency response, effect of normal loading and effect of shear loading on a single transducer element are discussed.
K M Eckrich
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biomedical sciences instrumentation     Volume:  27     ISSN:  0067-8856     ISO Abbreviation:  Biomed Sci Instrum     Publication Date:  1991  
Date Detail:
Created Date:  1991-08-09     Completed Date:  1991-08-09     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0140524     Medline TA:  Biomed Sci Instrum     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  135-40     Citation Subset:  IM    
Biomedical Engineering Dept., Iowa State University, Ames 50011.
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MeSH Terms
Analog-Digital Conversion
Equipment Design
Pressure Ulcer / prevention & control*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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