Medical device for introduction of a fluid into the blood circulation system of a patient and method for controlling leakage currents in a medical device provided or combined with a warming unit

Abstract

A warming unit () coupled or configured to be coupled to a heated portion () of a fluid circuit () of a medical device (). The warming unit () comprises a leakage current reduction circuit () configured to perform the following procedure: connecting a heat transfer element () of the warming unit () to a ground connection () through a resistance element (), which keeps a normal condition patient leakage current below a first limit value, and disconnecting the heat transfer element () from the ground connection () if a current indicating that a patient is connected to a mains voltage is sensed through the resistance element (), in order to keep a fault condition patient leakage current below a second limit value.