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Electromagnetic interference filter for implanted electronics

  • US 9,093,974 B2
  • Filed: 08/29/2013
  • Issued: 07/28/2015
  • Est. Priority Date: 09/05/2012
  • Status: Active Grant
First Claim
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1. An electromagnetic interference (EMI) filter, comprising:

  • a plurality of signal electrodes arranged in a respective plurality of arrays, with each signal electrode extending vertically between respective top and bottom surfaces of the filter such that the signal electrodes are flush with such top and bottom surfaces, and configured to be coupled on said top surface of the filter to internal conductors of an implantable medical device and coupled on said bottom surface of the filter to external lead wires implanted within a body in which such medical device is implanted;

    a plurality of ground electrodes arranged in parallel and interposed between the signal electrodes, such ground electrodes grounded at least one of internally and externally;

    dielectric material disposed between the signal electrodes and ground electrodes to act as insulator material between adjacent electrodes, and to define a filter body having a length along a longitudinal axis thereof, a thickness between the top and bottom surfaces thereof, and a width in the axis perpendicular to such longitudinal axis and the thickness; and

    metallization applied to selected regions on the top and bottom surfaces of the filter to connect respective arrays of signal electrodes and provide an interconnection surface for electrically attaching the filter to other components;

    wherein said signal electrodes each have a length dimension along the longitudinal axis of the filter which is less than one-half of the length of the filter along the longitudinal axis thereof, and said ground electrodes each have a length dimension along the longitudinal axis of the filter which is more than one-half of the length of the filter along the longitudinal axis thereof, and wherein the filter acts as a shielding element to prevent unwanted electromagnetic interference with the input and output of an associated implanted medical device.

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