We describe the design and operation of a new switch that can be operated by patients with severely limited movement. The basis for the switch is an inexpensive single-chip accelerometer device. The switch responds to a relatively rapid rotation of the active components. We have ensured that the sensitivity of the switch device is adjustable over a wide range. The device automatically adjusts for changes in attitude of the device that result from a patient changing posture. We show that the device can operate in a wide range of attitudes. We describe 2 case studies in which the switch was successfully used as a head tilt switch.
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| http://dx.doi.org/10.1016/s0003-9993(03)00013-3 | DOI Listing |
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