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Dynaflex

Quadricep and hamstring leg dynamometer for PT use

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Use Case

 

Load cell of leg dynamometer measures force exerted during the prone-lying hamstring and quadricep strength tests

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Prone-lying Quadricep Strength Test

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Prone-lying Hamstring Strength Test

Designing the Frame

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Frame Requirements:

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  • Angle adjustment for knee bend

  • Tibia height adjustment

  • Comfortable, responsive padded load cell

  • Impermanent, stable attachment to exam table

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Frame Prototypes:​

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We used larger 40mm 8020 rails and adjustments to test our initial design ideas.

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We used CAD modeling to test the weight and stability of a lighter, more compact 8020 model.

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Electronics ​

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We used a push-button load cell, HX711 amplifier, Arduino, buzzer, and LCD to make a functioning, user-friendly leg dynamometer.​​

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All electronics were mounted in a 3D-printed electronics housing, with a separate 3D-printed load cell housing

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Signage​

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Vinyl signage and laser cut angle labels makes using Dynaflex intuitive and simple.

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Image from iOS (23).jpg

Final Product​

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Continued Collaboration

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We continued to work with the clients to build a larger dynamometer for their bariatric table, and to add clamps to the design for a more secure attachment to the table.​

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