Patent ID: 8433410
Filing Date: 2013-04-30
Classification: A61N,H01G,H01R,H03H,H05K

Abstract:
1. A filter circuit for an active implantable medical device, comprising: an active implantable medical device (AIMD) comprising an electrically or thermally conductive housing and a hermetic feedthrough terminal; an AIMD electronic circuit disposed within the conductive housing; a conductor electrically coupling through the hermetic feedthrough terminal in nonconductive relation to the conductive housing and electrically coupled to the AIMD electronic circuit, the conductor defined as comprising a first node and a second node disposed in series along the conductor, the first node disposed closer to the hermetic feedthrough terminal and the second node disposed closer to the AIMD electronic circuit, the conductor further defined as comprising a first length between the hermetic feedthrough terminal and the first node, a second length between the first node and second node, a third length between the second node and the AIMD electronic circuit; a first frequency selective energy diversion circuit configured to divert high-frequency MRI energy away from the conductor to the conductive housing for dissipation of high-frequency MRI energy, the first diversion circuit electrically connected between the first node and the conductive housing; an impeding circuit configured to raise the high-frequency impedance of the conductor, the impeding circuit electrically connected in series along the second length of the conductor disposed between the first and second nodes; and a second frequency selective energy diversion circuit electrically connected between the second node and the conductive housing.