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Biomedical Engineer Don Witters (left) and Don Marlowe discuss
electromagnetic interference (EMI) with powered wheelchair control
systems. Because of their expertise in dealing with medical device
EMI, FDA suspected EMI was involved in reports of powered wheelchair
users experiencing uncontrolled and unintended movement near mobile
radio transmitters. The OST Electrophysics Branch laboratory evaluated
several of these devices and developed a procedure to test wheelchairs
and motorized scooters for susceptibility to radio transmissions
and other sources of EMI. The FDA protocol became the basis for
the EMI immunity tests of the ANSI/RESNA powered wheelchair standard
and the ISO draft standard.
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