Fysisk institutt - Rikshospitalet 1. 2 Electric current, perception- and hazard thresholds.

Fysisk institutt - Rikshospitalet1


Electric current,perception- and hazard

thresholds


Electrovibration (1uA 50Hz)

skin

conductor


Statistical scattering of sensitivity for electric current


Frequency dependency and spread of the let-go

threshold


Ventricular fibrillation thresholds in animals


Macro- og microshock


Electromedical devices must be CE-marked (Europe)

in out signal

patient(applied part)

power lineElectromedical

equipment(device)

?

protective earth (PE)


Patient near PC (B-apparatus)

signalspatient(applied part)

power line

A B

power line

?

signals(med.) (non-med.)

PE PE


American electric power distribution


4-leads (norske), og 5-leads (europeiske) electrical circuits

fra ”Medisinsk-teknisk sikkerhet på sykehus” Grimnes&Jensen 2003


Isolated system


Macroshock due to

ground fault


Microshock, two error situations


Ventricular fibrillation and pump failure vs catheter

area


Micro-shock


System forgrounding


Ground fault

circuit-interupter


FloatingPatient


Electrical isolation


Electric isolation


Isolated pressure transducer


Receptacles tests


Ground pin to chassis test


Chassisleakage

cuttent test


Patient leakage

current test


Leakage current between patient

leads


Isolation test for AC isolation

Fysisk institutt - Rikshospitalet 1. 2 Electric current, perception- and hazard thresholds.

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