Negative Resistance Patient Isolators - - Some Considerations


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Abstract

New, nonlinear, “switching” current limiters are being offered to medical equipment manufacturers and servicemen as a means to protect patients from shock hazards associated with electrical leakage or risk currents. Although the new switching-type current limiters appear to give 20-fold reductions in current through the patient, AC waveforms can still induce pulses of current which are large enough to create a potential shock hazard. The article illustrates this situation, and suggests some courses of action for manufacturers, CEs, and BMETs using such devices, or performing electrical safety tests on equipment which utilize such devices.

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