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Functional Electrical Stimulator Compex Motion


T. Keller, M.R. Popovic, I. Pappas, P.Y. Müller

International Workshop on Functional Electrical Stimulation, Vienna, Austria, no. 7, pp. 22-25

Research groups in the field of Functional Electrical Stimulation (FES) are often confronted with the fact that existing and commercially available FES stimulators do not provide sufficient flexibility and cannot be used to perform different FES tasks. The lack of flexibility of the commercial systems until now forced various FES research teams to develop their own stimulators. This paper presents a newly developed firmware and programming software for the commercial Compex 2 stimulator that enhances the stimulator's versatility and capabilities from a medical and therapeutic device to a neuroprosthesis and research tool. With the new firmware and a new graphical user interface software the stimulator can now be used to develop various custom-made neuroprostheses, neurological assessment devices, muscle exercise systems, and experimental setups for physiological studies. The new stimulator, called "Compex Motion", can be programmed to generate any arbitrary stimulation sequence that can be controlled or regulated by various external sensors, sensory systems or laboratory equipment. By interconnecting two or more Compex Motion stimulators the number of stimulation channels can be increased to multiples of four channels (8,12,16,20,…). The stimulation sequences and the control strategies are stored on exchangeable credit-card sized memory chip-cards read by the stimulator. The chip-cards are programmed using a standard PC. The function of the stimulator is changed instantaneously by simply inserting a different chip-card. The stimulator has four biphasic current regulated stimulation channels and two general purpose analog input channels that can be configured to measure the output voltage of a variety of sensor systems like goniometers, inclinometers, gyroscopes, or EMG sensors. For real-time EMG control of the stimulation patterns an EMG processing algorithm with software stimulation artifact blanking was implemented. The Compex Motion stimulator is manufactured by the Swiss company Compex SA and is currently undergoing clinical trials.

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% Autogenerated BibTeX entry
@InProceedings { KelEtal:2001:IFA_229,
    author={T. Keller and M.R. Popovic and I. Pappas and P.Y. M{\"u}ller},
    title={{Functional Electrical Stimulator Compex Motion}},
    booktitle={International Workshop on Functional Electrical Stimulation},
    address={Vienna, Austria},
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