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Functional electrical stimulation based training orthosis for hand function following stroke

Functional electrical stimulation based training orthosis for hand function following stroke
Functional electrical stimulation based training orthosis for hand function following stroke

Two types of device were developed.  The first based on shoulder mounted switches, designed to be immune to misalignment by the user.  The second type of device used the electromyogram (EMG) signal from the muscle that was being stimulated to control the stimulation.  A novel method of removing the stimulation and M wave artefact was developed enabling the intensity of the stimulation to be controlled by the EMG envelope.  Additionally, the stimulation could be triggered by EMG activity or maintained at a fixed level for as long as EMG activity was maintained.  The devices were tested in a series of case studies and factors effecting their uses explored.  In particular it was noticed that the effort in using a device directly impacted on the use of the device, increasing spastic tone and resisting the opening of the hand.  In general, shoulder mounted switches had least effect on tone followed by EMG triggered stimulation, then EMG maintained stimulation and finally EMG proportional stimulation.  It was observed that voluntary EMG activity was modulated by the stimulation and this effect was investigated further.

From a review of the literature a model of the principle peripheral nervous system motor control structure was developed.  The model was expressed in a series of linear equations and the effect of electrical stimulation examined.  A series of experiments were devised to examine the effect of electrical stimulation on voluntary EMG.  An apparatus for measuring isometric wrist torque while recording extensor and flexor EMG and a data acquisition system was constructed.  Measurements with subjects with normal neurology confirmed the effect in the extensors and additionally in the flexor muscle groups.  Graded voluntary effort and stimulation intensity tests enabled the main neurological processes to be identified and the majority of effects predicted by the model were observed.

University of Southampton
Taylor, Paul Nicholas
3120d032-bd81-486d-8351-b717d61730fd
Taylor, Paul Nicholas
3120d032-bd81-486d-8351-b717d61730fd

Taylor, Paul Nicholas (2004) Functional electrical stimulation based training orthosis for hand function following stroke. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Two types of device were developed.  The first based on shoulder mounted switches, designed to be immune to misalignment by the user.  The second type of device used the electromyogram (EMG) signal from the muscle that was being stimulated to control the stimulation.  A novel method of removing the stimulation and M wave artefact was developed enabling the intensity of the stimulation to be controlled by the EMG envelope.  Additionally, the stimulation could be triggered by EMG activity or maintained at a fixed level for as long as EMG activity was maintained.  The devices were tested in a series of case studies and factors effecting their uses explored.  In particular it was noticed that the effort in using a device directly impacted on the use of the device, increasing spastic tone and resisting the opening of the hand.  In general, shoulder mounted switches had least effect on tone followed by EMG triggered stimulation, then EMG maintained stimulation and finally EMG proportional stimulation.  It was observed that voluntary EMG activity was modulated by the stimulation and this effect was investigated further.

From a review of the literature a model of the principle peripheral nervous system motor control structure was developed.  The model was expressed in a series of linear equations and the effect of electrical stimulation examined.  A series of experiments were devised to examine the effect of electrical stimulation on voluntary EMG.  An apparatus for measuring isometric wrist torque while recording extensor and flexor EMG and a data acquisition system was constructed.  Measurements with subjects with normal neurology confirmed the effect in the extensors and additionally in the flexor muscle groups.  Graded voluntary effort and stimulation intensity tests enabled the main neurological processes to be identified and the majority of effects predicted by the model were observed.

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Published date: 2004

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Local EPrints ID: 465688
URI: http://eprints.soton.ac.uk/id/eprint/465688
PURE UUID: 23588517-1cb0-46f5-b5f4-957aac06b915

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Date deposited: 05 Jul 2022 02:35
Last modified: 16 Mar 2024 20:19

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Author: Paul Nicholas Taylor

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