Patent ID: 8140159

Claim:
A method for minimizing current in a lead circuit of an implantable medical device (IMD) system induced by coupled energy from an external source, comprising: providing a first impedance between a first node and a second node of the IMD, the lead circuit comprising a first lead configured to couple the first node of the IMD to a first target tissue and a second lead configured to couple the second node of the IMD to a second target tissue; receiving an indication of the presence of the coupled energy on the lead circuit; determining a characteristic of the coupled energy; selecting a second impedance from a plurality of impedances based at least in part on the characteristic of the coupled energy, the second impedance selected to minimize the current induced by the coupled energy; and providing the selected second impedance between the first node and the second node in place of the first impedance, wherein the first impedance and the second impedance are not open circuit impedances.