Patent ID: 8219199
Filing Date: 2012-07-10
Classification: A61N

Abstract:
1. An implantable medical device operable to sense signals from a patient or to provide a therapy to anatomical tissue of the patient in the presence of an interfering signal, comprising: a housing that includes circuitry; a connector block on the housing; at least one lead coupled at a proximal end to the implanted medical device and configured to be coupled at a distal end to the anatomical tissue, the at least one lead having a conductor therein that is configured to be electrically coupled to the circuitry within the implanted medical device; and an open circuit terminated transmission line having an electrical length approximately equal to one-quarter of a wavelength of the interfering signal, the open circuit terminated transmission line being electrically coupled to the conductor at the proximal end of the lead, wherein the interfering signal comprises a magnetic or electric field generated by a magnetic resonance imaging (MRI) scanner during an MRI scan, wherein the open circuit terminated transmission line resides within the connector block, wherein the open circuit terminated transmission line has a high dielectric constant, and wherein the open circuit terminated transmission line is configured to cause a phase-shifted version of the interfering signal to be reflected through the open circuit terminated transmission line to attenuate the interfering signal.