The object of this study was to measure the mechanical characteristics of several commonly used adapted switches in order to demonstrate the feasibility of collecting quantitative descriptions of switch performance. A stepping motor was used to drive a digital micrometer vertically towards the tested switch and proving-ring strain gauges recorded the operating force. Measures of activation and deactivation forces, travel and switch compliance were compared; several clinical examples illustrate the functional application of these results. It is anticipated that this information will permit clinicians to prescribe switches in a more accurate manner.
Bibliographical noteFunding Information:
The author is grateful to Dr Ian Hunter for making available the a paratus used to carry out the experiments and for Ki s many helpful suggestions. A reci-ation is also extended to Serge Lafontaine and !z axon August for their assistance. This work was supported by a grant from the Natural Science and Engineering Research Council of Canada.
- Severely physically disabled
- adapted switches
- force transducer
- static mechanical properties
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