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Design and development of ankle-foot prosthesis with delayed release of plantarflexion

This study focuses on designing a prosthetic ankle-foot system to capture and delay energy release during specific phases of the gait cycle, leading to smoother and more propulsive movements. By modifying an existing prosthesis and testing different delay settings, the results show improved motion ranges and timing, offering insights into personalized prosthetic designs. Subjects preferred particular delay times based on comfort and walking speed, indicating the potential benefits of responsive ankle mechanisms.

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Design and development of ankle-foot prosthesis with delayed release of plantarflexion

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  1. Design and development of ankle-foot prosthesis with delayed release of plantarflexion Michael Mitchell, MSc; Katelyn Craig, MSc; Peter Kyberd, PhD; Edmund Biden, DPhil; Greg Bush, CP

  2. Aim • Capture absorbed energy in ankle and delay its release until specific times in gait cycle. • Relevance • Adjusting timing of energy release may provide: • Smoother prosthetic gait. • Further insight into prosthetic gait by providing propulsive force at specific times during gait.

  3. Method • Prosthesis (Össur Talux foot) was modified to capture maximum deflection induced on foot during dorsiflexion and retain it for controlled time period. • 2 subjects tried the device: • Subject 1 was involved in initial design phase and had full gait analysis. • Subject 2 simply tested device and delay settings.

  4. Results • Combination of doubling mass of prosthesis and tethering shank and ankle affected gait cycle of both limbs: • Ranges of motion and timing of stride became closer to nondisabled population. • After all delay settings were tested: • Subject 1 found that 65 ms delay was most comfortable. • Subject 2 felt that longer delay was appropriate for slower walking speed.

  5. Conclusion • Results suggest that an ankle that responds to user’s pace may be useful in a similar manner as the adaptive swing-phase knee designs that are available. • Based on subjects’ feedback and data, lengthening impulse from foot appears to makes it more comfortable to use.

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