Journal article Open Access

A patient-controlled functional electrical stimulation system for arm weight relief

Klauer, Christian; Ferrante, Simona; Ambrosini, Emilia; Shiri, U; Dähne, F; Schmehl, I; Pedrocchi, Alessandra; Schauer, Thomas


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    "doi": "10.1016/j.medengphy.2016.06.006", 
    "description": "<p>A patient-driven control strategy for Functional Electrical Stimulation (FES), which amplifies volitionally-initiated shoulder abductions, is proposed to improve stroke patients&#39; rehabilitation. Based on the measured abduction angle, a FES-induced muscle recruitment is generated that yields a pre-specified percentage of this angle - yielding arm weight relief. To guarantee the correct recruitment also under fatigue and uncertain muscle activation we employ feedback control of the recruitment level determined by filtering the FES-evoked electromyogram. Filter parameters are user-optimized to obtain a linear relation between filter output and angle with a good signal-to-noise ratio. The auto-tuned recruitment controller (RC) was tested on five healthy subjects and compared to direct stimulation (DS) while muscle fatigue progressively occurred. Results showed a more linear relation between recruitment level and angle than between non-controlled stimulation intensity and angle (R<sup>2</sup>=0.93 vs. R<sup>2</sup>=0.79, angular range of 54&deg;). After 6&nbsp;min of stimulation, abduction decreased by 42% &plusmn; 14 for DS and by 0% &plusmn; 12 for RC, showing an effective compensation of fatigue. RC yielded significant smaller errors than DS in generating desired angles (0.23% &plusmn; 5.9 vs. 14.6% &plusmn; 9.7). When FES-induced arm weight support was provided, a mean reduction of the volitional effort (determined by Electromyography) of 78% was achieved compared to angular tracking without FES. First experiments with one acute stroke patient are also reported.</p>", 
    "language": "eng", 
    "title": "A patient-controlled functional electrical stimulation system for arm weight relief", 
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    "publication_date": "2017-11-01", 
    "creators": [
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        "affiliation": "Technische Universit\u00e4t Berlin", 
        "name": "Klauer, Christian"
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      {
        "affiliation": "Politecnico di Milano", 
        "name": "Ferrante, Simona"
      }, 
      {
        "affiliation": "Politecnico di Milano", 
        "name": "Ambrosini, Emilia"
      }, 
      {
        "affiliation": "Klinik f\u00fcr Neurologie mit Stroke Unit und Fr\u00fchrehabilitation", 
        "name": "Shiri, U"
      }, 
      {
        "affiliation": "Klinik f\u00fcr Neurologie mit Stroke Unit und Fr\u00fchrehabilitation", 
        "name": "D\u00e4hne, F"
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      {
        "affiliation": "Klinik f\u00fcr Neurologie mit Stroke Unit und Fr\u00fchrehabilitation", 
        "name": "Schmehl, I"
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      {
        "affiliation": "Politecnico di Milano", 
        "name": "Pedrocchi, Alessandra"
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        "affiliation": "Technische Universit\u00e4t Berlin", 
        "name": "Schauer, Thomas"
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