Patent ID: 6510345
Filing Date: 2003-01-21
Classification: A61N

Abstract:
A method of preventing unwanted alternating current (AC) magnetic fields transmitted from an external source from disrupting electrical circuitry within an implantable medical device, while permitting desired communications between the implantable device and a programmer, the method comprising:activating an electrical device within the implantable medical device electrically coupled in parallel with an inductive transceiver coil, thereby providing a short circuit in parallel with the inductive transreceiver coil during non-detection of the programmer in proximity to the implantable medical device by activating an electrical device within the implantable medical device electrically coupled in parallel with an inductive transceiver coil; deactivating the electrical device during detection of the presence of the programmer in proximity to the implantable medical device, thereby providing an open circuit in parallel with the inductive transreceiver coil by activating an electrical device within the implantable medical device electrically coupled in parallel with an inductive transceiver coil; and communicating between the implantable medical device and the proximally located programmer.