Patent ID: 7865247
Filing Date: 2011-01-04
Classification: A61N,H03H

Abstract:
1. A medical device for delivering a therapy pacing pulse to a patient in a changing magnetic field, the device comprising: an electronics unit configured to generate the therapy pacing pulse; a lead assembly having a proximal end and a distal end; a conductor having a proximal end and a distal end contained within the lead assembly configured to conduct the therapy pacing pulse, the proximal end being operatively coupled to the electronics unit; an electrode coupled proximate the distal end of the first conductor; a first current limiting diode coupled in series with the conductor and the electrode, the first current limiting diode having a proximal anode and a distal cathode; and a second current limiting diode coupled in series with the first current limiting diode, the second current limiting diode having a distal anode, a proximal cathode and a reverse breakdown voltage less than a voltage of the therapy pacing pulse; the first and second current limiting diodes substantially restricting currents induced in the conductor by the changing electromagnetic field to the electronics unit.