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Tank filters placed in series with the lead wires or circuits of active medical devices to enhance MRI compatibility

  • US 8,649,857 B2
  • Filed: 04/06/2011
  • Issued: 02/11/2014
  • Est. Priority Date: 06/08/2006
  • Status: Active Grant
First Claim
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1. An implantable medical therapeutic or diagnostic device, comprising:

  • a) an electrode;

    b) a lead wire having a length extending from a distal portion connected to the electrode to a proximal end that is electrically connectable to an electronic circuitry of an active medical device, wherein the lead wire is at least partially coiled along its length to thereby provide a coiled wire portion forming a coil lumen; and

    c) a capacitor having a first metallization electrically connected to at least one first electrode plate interleaved with a second, opposite polarity electrode plate electrically connected to a second metallization, wherein the coiled wire portion wraps around the capacitor disposed in the coil lumen with the first capacitor metallization connected to the coiled wire portion at a first electrical connection spaced from the second capacitor metallization connected to the coiled wire portion at a second electrical connection to thereby form a tank filter having electrical inductance in parallel with capacitance;

    d) wherein the tank filter attenuates current flow over a range of selected frequencies.

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