Developing a process for assessing equivalency of wheelchair cushion pressure redistribution performance

Area of Science:

• Biomedical Engineering
• Rehabilitation Engineering
• Materials Science

Background:

• Wheelchair users are at high risk for pressure ulcers, necessitating effective cushion prescription.
• A variety of wheelchair cushion designs exist, creating a need for standardized performance evaluation.
• Assessing tissue integrity and load-bearing performance is crucial for preventing pressure ulcers.

Purpose of the Study:

• To develop and validate an approach for assessing the pressure redistribution performance of wheelchair cushions.
• To establish a method for determining cushion equivalency relative to a standard reference material.
• To enhance the selection process for pressure-relieving wheelchair cushions.

Main Methods:

• Utilized two instrumented compliant buttock models with differing forms to evaluate cushion performance.
• Characterized load-bearing performance by measuring stress and strain parameters.
• Compared eight wheelchair cushions and a standard reference material (HR45 foam) under controlled loading conditions.

Main Results:

• The developed approach effectively evaluated wheelchair cushion performance using stress and strain measurements.
• A logic-based system was implemented to determine cushion equivalency to the HR45 foam standard.
• The instrumented buttock models demonstrated enhanced capability in measuring load-bearing performance.

Conclusions:

• The proposed method offers a robust approach to assess wheelchair cushion pressure redistribution.
• Further research is required to validate the methodology and establish definitive equivalency thresholds.
• This approach can aid in the objective selection of pressure-relieving wheelchair cushions for at-risk individuals.