Evidence-based Test Method Development. Wheelchair... · •Need for Evidence-Based Test Method...
Transcript of Evidence-based Test Method Development. Wheelchair... · •Need for Evidence-Based Test Method...
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Evidence-based Test Method Development
Jon PearlmanAnand Mhatre- International Society for Wheelchair Professionals - Department of Rehab Science & Technology
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Agenda• Motivation• Project Goals• Test Method Development• Free Resources• Focus on Caster Test Method • Takeaways & Future Work
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Motivation: Evidence of Poor WC Quality
1 in 3 experienced at least one adverse consequence
(Mcclure, 2009). (Toro, 2016). (Worobey, 2012). (Mann, 1996). (Hansen, 2004).
Work completed in USA, Mexico & Indonesia.
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Motivation: Evidence of Poor WC QualityAdverse Incidence 2009-2017: Frequency of Component Type involved in
Powered Wheelchair incidenceSource: WestMARC Adverse Incidence Database (n-1100)
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Projects & Goals1. Identify and address gaps in test methods for adverse
conditions (USAID Funded)• WHO Guidelines on MWCs in Less Resourced Settings• AJOD Publication listing priorities
2. Use Standards To guide Clinical Decisions• Supported by NIDILRR (US GOVT)• Standards Development: Cushions, Casters, Rolling Res.• Data mining of failure data to identify gaps in standards
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Test Method Development
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Test Method Development
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Free Resources www.wheelchairnet.org
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Focus on Castor Test Method
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Castor Failures• Among all parts, castors fails most often with different failure modes based on research
evidenceScotland Kenya Indonesia Mexico
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Castor Testing• Develop reliable castor testing protocol• ISO & ICWM Standards do not reproduce field failures
• Lack of environmental factors
• Testing needs• Include environmental factors• Include a range of shock conditions• Ability to change caster load, speed and direction of travel
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Shock Validation
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Field data ISWP Chakra shock exposure ISO Double drum shock exposure
2 half inch obstacles
2 half + 1 three quarter inch obstacles
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Corrosion Validation
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Abrasion (tire wear) validation
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Castor Testing Study
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Testing Outcomes• Field failures comparison
• 73% testing failures match field failures
• Environmental factors have impact on• Durability – 25% models• Failure mode change – 75% models
• 2/3 changed failures modes pose higher risk for user injuries
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Takeaways• Environmental conditions affect wheelchair quality
• No progress towards inclusion of environmental conditions in testing• Outcomes from caster testing showed impact of environmental factors on quality• Inclusion of environmental factors in wheelchair testing
• Need for Evidence-Based Test Method Development • Field data collection• Include impacts, heat and other testing factors
• Free Resources• Castor design guidelines • Test equipment assembly instructions
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AcknowledgementsGrantsAPC/USAID: APC-GM-0068 & 0107NIDILRR: 90REGE0001, 90SI5014, 90DP0078, 90DP0025
Team at Pitt, ISWP, [email protected]@pitt.eduwww.wheelchairnet.org (resource hub)