A system for the delivery of programmable, adaptive stimulation intensity envelopes for drop foot correction applications |
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Authors: | Breen P P O'Keeffe D T Conway R Lyons G M |
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Affiliation: | Biomedical Electronics Laboratory, Department of Electronic and Computer Engineering, University of Limerick, National Technological Park, Limerick, Ireland. |
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Abstract: | We describe the design of an intelligent drop foot stimulator unit for use in conjunction with a commercial neuromuscular electrical nerve stimulation (NMES) unit, the NT2000. The developed micro-controller unit interfaces to a personal computer (PC) and a graphical user interface (GUI) allows the clinician to graphically specify the shape of the stimulation intensity envelope required for a subject undergoing drop foot correction. The developed unit is based on the ADuC812S micro-controller evaluation board from Analog Devices and uses two force sensitive resistor (FSR) based foot-switches to control application of stimulus. The unit has the ability to display to the clinician how the stimulus intensity envelope is being delivered during walking using a data capture capability. The developed system has a built-in algorithm to dynamically adjust the delivery of stimulus to reflect changes both within the gait cycle and from cycle to cycle. Thus, adaptive control of stimulus intensity is achieved. |
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