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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{
  "inLanguage": {
    "alternateName": "eng", 
    "@type": "Language", 
    "name": "English"
  }, 
  "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>", 
  "license": "https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "Technische Universit\u00e4t Berlin", 
      "@type": "Person", 
      "name": "Klauer, Christian"
    }, 
    {
      "affiliation": "Politecnico di Milano", 
      "@type": "Person", 
      "name": "Ferrante, Simona"
    }, 
    {
      "affiliation": "Politecnico di Milano", 
      "@type": "Person", 
      "name": "Ambrosini, Emilia"
    }, 
    {
      "affiliation": "Klinik f\u00fcr Neurologie mit Stroke Unit und Fr\u00fchrehabilitation", 
      "@type": "Person", 
      "name": "Shiri, U"
    }, 
    {
      "affiliation": "Klinik f\u00fcr Neurologie mit Stroke Unit und Fr\u00fchrehabilitation", 
      "@type": "Person", 
      "name": "D\u00e4hne, F"
    }, 
    {
      "affiliation": "Klinik f\u00fcr Neurologie mit Stroke Unit und Fr\u00fchrehabilitation", 
      "@type": "Person", 
      "name": "Schmehl, I"
    }, 
    {
      "affiliation": "Politecnico di Milano", 
      "@type": "Person", 
      "name": "Pedrocchi, Alessandra"
    }, 
    {
      "affiliation": "Technische Universit\u00e4t Berlin", 
      "@type": "Person", 
      "name": "Schauer, Thomas"
    }
  ], 
  "headline": "A patient-controlled functional electrical stimulation system for arm weight relief", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "datePublished": "2017-11-01", 
  "url": "https://zenodo.org/record/1240916", 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.1016/j.medengphy.2016.06.006", 
  "@id": "https://doi.org/10.1016/j.medengphy.2016.06.006", 
  "@type": "ScholarlyArticle", 
  "name": "A patient-controlled functional electrical stimulation system for arm weight relief"
}
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