| 摘要 |
<p>A controller 12 is provided for a functional electrical stimulator (FES) for attachment to a leg comprising, a connector for a foot switch 18 for sensing foot rise or foot strike, a circuit for responding to said foot switch 12 for generating stimulation pulses and a connector for first and second electrodes 14, 16 for attachment to the leg for supplying stimulation pulses from said circuit The circuit includes a voltage divider (18, 34 fig 2) of which the foot switch when connected comprises one element (18 fig 2) , a second element being provided by a digital potentiometer forming part of the controller (34). A microcontroller (20 fig 2) is configured to make adaptive adjustment of the resistance of said digital potentiometer (34) 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.</p> |
