Real time closed loop functional electrical stimulation system for use in upper extremity motor rehabilitation
Translated title
Real tid lukket sløjfe funktionelt elektrisk terapi system til anvendelse i øvre ekstremitet motor rehabilitering
Authors
Poulsen, Rune Skødt ; Sørensen, Rasmus Stengaard
Term
4. term
Publication year
2013
Submitted on
2013-06-04
Pages
83
Abstract
Formålet med dette projekt var at udvikle et realtids, lukket sløjfe-system til funktionel elektrisk stimulering (FES) til brug i motorisk rehabilitering af overekstremiteten. Systemkrav blev afledt af principper fra Constraint-Induced Movement Therapy (CIMT) og funktionel elektrisk terapi. Løsningen blev implementeret i MATLAB og kombinerede et Microsoft Kinect-dybdekamera til at registrere en kop og brugerens hånd med en elektrisk stimulator, der leverede stimulation til underarmen for at assistere greb. Stimulationen blev reguleret i realtid ud fra den registrerede interaktion mellem hånd og kop; hvis hjælpen ikke var tilstrækkelig til at løfte koppen, kunne brugeren øge intensiteten ved at føre hånden nærmere koppens top. Systemet blev afprøvet på fem raske deltagere og én med ensidig motorisk funktionsnedsættelse. Brugervenlighed, elektrodeplacering, stimulationsintensitet og -regulering blev kvalitativt vurderet, og systemets tekniske ydeevne blev testet. Hos den motorisk funktionsnedsatte deltager tydede observationerne på forbedret grebskontrol og mere stabil håndtering af koppen med assisterende stimulation sammenlignet med uden; hurtig muskeltræthed forhindrede dog indsamling af kvantitative præstationsdata. Systemet vurderes som et lovende grundlag for videre udvikling.
The aim of this project was to develop a real-time, closed-loop functional electrical stimulation (FES) system for upper-limb motor rehabilitation. System requirements were derived from principles of Constraint-Induced Movement Therapy (CIMT) and functional electrical therapy. The solution was implemented in MATLAB and combined a Microsoft Kinect depth camera to detect a cup and the user’s hand with an electrical stimulator delivering forearm stimulation to assist grasp. Stimulation was adjusted in real time based on the detected hand–cup interaction; if assistance was insufficient to lift the cup, the user could increase intensity by sliding the hand closer to the top of the cup. The system was tested with five healthy participants and one individual with unilateral motor impairment. Usability, electrode placement, stimulation intensity, and regulation were qualitatively evaluated, and technical performance was assessed. In the motor-impaired participant, observations suggested improved grip control and steadier cup manipulation with assistive stimulation compared with no stimulation; however, rapid muscle fatigue prevented collection of quantitative task performance data. The system provides a proof-of-concept foundation for further development.
[This summary has been generated with the help of AI directly from the project (PDF)]
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