Transcript ESC 2003 - University of Sheffield

Functional electrical stimulation-based
cycling exercise for paraplegics using
flywheel and electrical clutch
mechanism
Shwan Abdulla
Supervisor: Dr. M. Osman Tokhi
The University of Sheffield
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Introduction
 People with SCI are at high risk of obesity, pressure sores,
cardiovascular disorders
 Despite the damage in the spinal cord, the lower limbs` muscles are
intact
 Functional electrical stimulation (FES) can be used to provide training
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UKACC PhD Presentation Showcase
Slide 2
Aim and objectives
 Develop an in-door FES-assisted cycling ergometer to exercise
paraplegics by stimulating single muscle group, the quadriceps
 Integrate a novel assist mechanism (flywheel and electrical clutch)
to assist the legs, delay muscle fatigue and prolong the exercise
Current status

PID/Fuzzy logic-based control for FES cycling (with and without
assist mechanism)
 Fuzzy logic-based closed loop control for flywheel/clutch
mechanism
 Force-drop monitor (derived from clinically recorded data)
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UKACC PhD Presentation Showcase
Slide 3
Results
Fig. 1: Left leg tracking the reference
Fig. 3: Flywheel engagement
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Fig. 2: Left muscle torque (without assist)
Fig. 4: Left muscle torque (with assist)
UKACC PhD Presentation Showcase
Slide 4
Conclusion and future work

The new proposed assist mechanism can be used to delay muscle
fatigue (by 15-17%) and prolongs the exercise
Fig. 5: Fatigue improvement percentage (using
flywheel and clutch mechanism)

Hardware implementation, testing and validation
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UKACC PhD Presentation Showcase
Slide 5
Simulation video
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UKACC PhD Presentation Showcase
Slide 6