The signal from the device is used to control external communication and control devices such as environmental controllers and computers. The device consist of a tuned coil and switch embedded in an anatomically fitted oral plate. Closure of the switch by the tongue is detected by power loss in a tuned oil worn round the neck, so no wires need enter the mouth.
Components are cheap and no battery is required in the mouth.
The system is designed to comply with the latest frequency allocations and MDD requirements. The aim of this PhD research project has been to investigate the response of soft tissues to forces, especially shear force, applied externally to the skin surface. An important new understanding of the relationship between pressure, shear and blood flow in soft tissue has emerged. Theoretical risk of pressure sore development appears to correlate with the vector sum of pressure and shear, rather that pressure or shear independently. A graphical presentation of pressure and shear over the prosthetic stump has been produced from experimental measurements.