APPARATUS FOR FUNCTIONAL ELECTRICAL STIMULATION OF THE BODY

摘要

A controller is provided for a functional electrical stimulator for attachment to a leg comprising, a connector for a foot switch for sensing foot rise or foot strike,a circuit for responding to said foot switch for generating stimulation pulses and a connector for first and second electrodes for attachment to the leg for supplying stimulation pulses from said circuit The circuit includes a voltage divider of which the foot switch when connected comprises one element, a second element being provided by a digital potentiometer forming part of the controller. A micro controller is configured to make adaptive adjustment of the resistance of said digital potentiometer to take account of the resistance characteristics of the foot switch to provide an output or reference voltage permitting an open/closed state of the switch to be monitored. In an embodiment, manually operable external control devices form part of said controller and the micro controller is configured on operation of said external control devices to change between a working state in which stimulation pulses are provided depending on the state of the foot switch and a setup state for entry using the external control devices of parameters defining characteristics of the stimulation pulses.