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’Virtual’ Electrode Control Environment


A. Brunschweiler

Diploma/Master Thesis, WS 04/05

Functional electrical stimulation can be used to increase independence by restoring functional muscle control in people with disabilities resulting from neurological disorders. Experiments showed that transcutaneous electrode arrays can be used to increase control of functional grasp when compared to simple transcutaneous electrodes. To enable experiments with larger arrays, a new multiplexer was developed to switch stimulation pulses from a constant current stimulator. The system developed in this thesis allows up to 256 electrode pads to be addressed, although only a 64 element circuit was tested. Each element can be switched between active, reference and high impedance states.
The current implementation allows execution of experiments to investigate the effect of different stimulation pattern sequences on finger forces. Due to the modular design, the system can be adapted to new control strategies, such as customization of stimulation patterns depending on the measured finger forces.
First grasp measurements using a 56 element transcutaneous electrode array show the importance of the array’s spatial resolution to be able to selectively stimulate the middle and ring finger. The results are encouraging for continued research into using transcutaneous electrode arrays to improve functional electrically stimulated grasp.

Supervisors: M. Lawrence, Dr. T. Keller, Prof. M. Morari


Type of Publication:

(12)Diploma/Master Thesis

M. Morari

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2005:IFA_2767
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