Emanuele Zennaro, Carlo Mazzetti, Giovanni L. Amicucci, Fabio Fiamingo
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Operating theatre, electrical safety, microshock risk, elec-trical circuit model, patient monitor, defibrillator, operat-ing table.
During a surgical procedure leakage currents can flow
through the heart of the patient. The values of such cur-
rents can be estimated by an electrical circuit model.
More specifically, three medical electrical equipment in
an operating theatre, in contact with the patient and fed by
an isolated power supply, are considered and are simulat-
ed. Two of them are always involved in a surgical proce-
dure: an operating table and a patient monitor, the third
one is a defibrillator which can be put into operation dur-
The comparison between the leakage currents simulated
by the circuit and the ones measured are presented. The
agreement is quite satisfactory. An estimation of the mod-
el sensitivity due to the uncertainty in the knowledge of
the model parameters has been performed too, by using
the Monte Carlo method.
The proposed model is applied to study critical scenarios
in which leakage currents flowing into the patient’s chest
in normal, single and double fault conditions could be
dangerous and could introduce a risk of microshock not