Torso Driven Chair
The objective was to design a device enabling wheelchair users with physical disabilities, such as spinal muscular atrophy (SMA), to drive using torso movements, with elastic straps for support and compatibility with most wheelchairs.
My Role in the Project
I led the design, prototyping, and material selection, focusing on user-friendly straps and anchor points. I conducted user testing and iterated the design to ensure functionality and comfort.
Target Users and User Testing
The target users are wheelchair users with limited limb mobility, particularly those with SMA or similar conditions, seeking an intuitive way to control their wheelchair and strengthen their muscles. Wheelchairs like the Omeo have anchor points (red circles) for attaching this device.
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Initial prototypes had overly stiff and short straps, causing discomfort. I switched to longer and more elastic, synthetic materials, improving comfort and functionality. Users reported strap discomfort, resolved by selecting straps with a wider cross-section.
Preliminary Work and Challenges
I researched elastic materials and wheelchair anchor points, creating prototypes to test strap strength and attachment mechanisms. Force gauges were used to measure leaning forces, guiding material selection.
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Challenges included designing straps to withstand leaning forces while helping users return to a neutral position, ensuring compatibility with various wheelchairs, and maintaining user comfort. Material durability was also critical.
Final Product and Discussion
The final device features elastic straps that support torso-driven movement, easily attaching to common wheelchair anchor points. A force gauge aids ongoing strap material research, with plans for synthetic, muscle-like materials.
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This project emphasized user-centered design and material science. Iterative user testing was crucial in achieving comfort and functionality, resulting in a device that enhances mobility for users with disabilities.
