Patent ID: 8583255
Filing Date: 2013-11-12
Classification: A61N

Abstract:
1. An active implantable medical device system that is protected against effects of a magnetic field and that is configured to perform at least one of a cardiac stimulation, a resynchronization, and a defibrillation operation, the active implantable medical device system comprising: a lead having a proximal end and a distal end and comprising a first conductor and a second conductor that extends along a length of the lead, the lead further comprising a first electrode coupled to the first conductor and a second electrode coupled to the second conductor; and a generator comprising an electronic circuit and a metal housing, wherein the electronic circuit is configured to sense cardiac activity and deliver stimulation pulses through the lead, and wherein the metal housing has a ground potential, wherein the generator comprises one or more switching devices configured to switch between a normal configuration and a safekeeping configuration, wherein (i) the one or more switching devices, in the safekeeping configuration, are configured to disconnect the second conductor from the electronic circuit and to connect the second conductor to the ground potential of the metal housing, (ii) the first conductor is connected to the electronic circuit in the safekeeping configuration, and (iii) the one or more switching devices, in the safekeeping configuration, are configured to cause the second conductor to shield the first conductor from at least a portion of the effects of the magnetic field while the first conductor remains connected to the electronic circuit for use in sensing the cardiac activity and delivering the stimulation pulses.