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EMI filtered co-connected hermetic feedthrough, feedthrough capacitor and leadwire assembly for an active implantable medical device

  • US 10,046,166 B2
  • Filed: 05/26/2016
  • Issued: 08/14/2018
  • Est. Priority Date: 01/16/2012
  • Status: Active Grant
First Claim
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1. A hermetically sealed feedthrough filter assembly attachable to an active implantable medical device (AIMD), the feedthrough filter assembly comprising:

  • a) an insulator substrate assembly, comprising;

    i) an insulator body separating a first side from a second side;

    ii) a via hole disposed through the insulator body extending from the first side to the second side;

    iii) a conductive fill disposed within the via hole forming a filled via electrically conductive between the first side and the second side;

    iv) a first hermetic seal between the filled via and the insulator body;

    b) a ferrule, comprising;

    i) a conductive ferrule body defining a ferrule opening;

    ii) a second hermetic seal between the insulator body and the conductive ferrule body, wherein the ferrule opening is hermetically sealed by the insulator body;

    c) a feedthrough filter capacitor disposed on the second side, the feedthrough filter capacitor comprising;

    i) an active electrode plate disposed parallel and spaced from a ground electrode plate, wherein the plates are disposed within a capacitor dielectric substrate;

    ii) a first passageway disposed through the capacitor dielectric substrate and disposed perpendicular to the plates;

    iii) an internal metallization disposed within the first passageway electrically connected to the active electrode plate and in non-conductive relation with the ground electrode plate;

    iv) an external metallization disposed on an outside surface of the capacitor dielectric substrate and electrically connected to the ground electrode plate and in non-conductive relation with the active electrode plate;

    d) a conductive leadwire having a proximal leadwire end extending to a distal leadwire end, wherein the proximal leadwire end is connectable to electronics internal to the AIMD, and wherein the distal leadwire end is disposed at least partially through the first passageway of the feedthrough filter capacitor and is in contact with or adjacent to the second side conductive fill;

    e) a first electrically conductive material forming at least a three-way electrical connection electrically connecting the second side conductive fill to the internal metallization of the feedthrough filter capacitor and to the distal leadwire end; and

    f) a second electrically conductive material electrically connecting the external metallization of the feedthrough filter capacitor to the ferrule.

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