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. 2022 Sep 30:10:1006767.
doi: 10.3389/fbioe.2022.1006767. eCollection 2022.

Procedure to categorize wheelchair cushion performance using compliant buttock models

Stephen Sprigle  1 , Yogesh Deshpande  1
Affiliations

Procedure to categorize wheelchair cushion performance using compliant buttock models

Stephen Sprigle et al. Front Bioeng Biotechnol. .

Abstract

Purpose: Wheelchair cushion prescription often seeks to address tissue integrity in addition to other clinical indicators. Because hundreds of wheelchair cushion models are available, a benefit would result if cushions were classified in a more valid manner to help guide selection by clinicians and users. The objective of this research was to develop an approach to evaluate and classify wheelchair cushion performance with respect to pressure redistribution. Materials and methods: Two anatomically-based buttock models were designed consisting of an elastomeric shell that models overall buttock form and a rigid substructure that abstracts load-bearing aspects of the skeleton. Model shapes were based upon elliptical and trigonometric equations, respectively. Two performance parameters were defined, pressure magnitude and pressure redistribution. The pressure magnitude parameter compared internal pressure values of the test cushion to a flat foam reference material, resulting in three classifications, superior, comparable, and inferior. Surface sensors were used to distinguish cushions with high, moderate or low pressure redistribution performance. Ten wheelchair cushions were evaluated by both models using two loads that represent a range of body weights expected for 41-43 cm wide cushions. Results and Conclusion: A classification matrix is proposed using both models and performance parameters. Two cushions met criteria for the highest level of performance, and one cushion was deemed to have inadequate performance for therapeutic value. The proposed method has a sensitivity to discern differences, compatibility with different sized cushions, and a versatility in classification. As such, it stands as an improvement over existing classification approaches.

Keywords: classification; interface pressure; measurement; performance; wheelchair cushion.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

FIGURE 1
FIGURE 1
Shapes of elliptical and trigonometric elastomer shells.
FIGURE 2
FIGURE 2
(A) Rigid substructure, internal pressure sensor locations and (B) surface sensor locations depicted on the trigonometric model.
FIGURE 3
FIGURE 3
Examples of classifications based upon point estimates and CI relative to ELs.
See this image and copyright information in PMC

References

    1. Akins J., Karg P., Brienza D. (2011). Interface shear and pressure characteristics of wheelchair seat cushions. Jrrd 48 (3), 225–234. 10.1682/jrrd.2009.09.0145 - DOI - PubMed
    1. ANSI/RESNA WC-3:2018 (2018). American National Standard for Wheelchairs Volume 3: Wheelchair Seating, in Section 2. Determination of physical and mechanical characteristics of devices intended to manage tissue integrity – Seat cushions . Arlington, VA: American National Standard for Wheelchair.
    1. Barbenel J. C. (1991). Pressure management. Prosthet. Orthot. Int. 15 (3), 225–231. 10.3109/03093649109164292 - DOI - PubMed
    1. Bennett L. (1973). Transferring load to flesh. V. Experimental work. Bull. Prosthet. Res. 10 (19), 88–103. - PubMed
    1. Bouten C. V., Oomens C. W., Baaijens F. P., Bader D. L. (2003). The etiology of pressure ulcers: Skin deep or muscle bound? Archives Phys. Med. Rehabilitation 84 (4), 616–619. 10.1053/apmr.2003.50038 - DOI - PubMed