Interface Patient and Amplifier, Risk Considerations

Amplifier failure so that the amplifier sends uncontrolled error currents into the patient. It may for instance be that the input transistor has broken down so that the power 

The patient is defibriUated while coupled to the amplifier. A defibrillator shock can be up to 5 kV and is applied via two large electrodes to the thorax. A substantial part of this voltage can appear between PUl and PU2. The frequency is much lower and the LPFs will damp the signal much less than the static discharge case. But file protection diodes will play an important role. 

Usually the value of R1 is chosen larger than R2. The R1 resistors must therefore be 

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