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PROCESS FOR TUNING AN EMI FILTER TO REDUCE THE AMOUNT OF HEAT GENERATED IN IMPLANTED LEAD WIRES DURING MEDICAL PROCEDURES SUCH AS MAGNETIC RESONANCE IMAGING

  • US 20070083244A1
  • Filed: 11/03/2005
  • Published: 04/12/2007
  • Est. Priority Date: 10/06/2005
  • Status: Abandoned Application
First Claim
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1. A process for tuning an EMI filter for an active implantable medical device (AIMD), the EMI filter having a capacitor and an inductor/resistor element, comprising the steps of:

  • evaluating input impedance of the AIMD;

    configuring the physical relationship of the capacitor and the inductor/resistor element of the EMI filter, based on the evaluated input impedance of the AIMD;

    iteratively selecting component values for the capacitor and inductor/resistor elements of the EMI filter; and

    analyzing the impedance characteristics of the selected components through circuit simulation to assess (a) whether the impedance of the EMI filter has been raised sufficiently to reduce undesirable RF currents that would flow during medical diagnostic procedures, and (b) if the AMID is adequately protected against environmental emitters and complies with regulatory requirements.

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