Functional electrical stimulationbased cycling exercise for paraplegics using

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 Univ logo

Introduction Ø People with SCI are at high risk of obesity, pressure sores, cardiovascular disorders Ø Despite the damage in the spinal cord, the lower limbs` muscles are intact Ø Functional electrical stimulation (FES) can be used to provide training Univ logo UKACC Ph. D Presentation Showcase Slide 2

Aim and objectives Ø Develop an in-door FES-assisted cycling ergometer to exercise paraplegics by stimulating single muscle group, the quadriceps Ø Integrate a novel assist mechanism (flywheel and electrical clutch) to assist the legs, delay muscle fatigue and prolong the exercise Current status Ø PID/Fuzzy logic-based control for FES cycling (with and without assist mechanism) Ø Fuzzy logic-based closed loop control for flywheel/clutch mechanism Ø Force-drop monitor (derived from clinically recorded data) Univ logo UKACC Ph. D Presentation Showcase Slide 3

Results Fig. 1: Left leg tracking the reference Fig. 2: Left muscle torque (without assist) Fig. 3: Flywheel engagement Fig. 4: Left muscle torque (with assist) Univ logo UKACC Ph. D 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 Univ logo UKACC Ph. D Presentation Showcase Slide 5

Simulation video Univ logo UKACC Ph. D Presentation Showcase Slide 6