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Feedthrough filter terminal assemblies with breathable components to facilitate leak testing

  • US 7,797,048 B2
  • Filed: 03/22/2007
  • Issued: 09/14/2010
  • Est. Priority Date: 04/03/2006
  • Status: Active Grant
First Claim
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1. A feedthrough terminal assembly for an active implantable medical device (AIMD), comprising:

  • a conductive terminal pin or lead wire extending through a conductive ground plane of the AIMD in non-conductive relation;

    a feedthrough capacitor associated with the conductive terminal pin or lead wire, the capacitor having first and second sets of electrode plates;

    a hermetic insulator disposed adjacent to a face of the capacitor and disposed between the terminal pin or lead wire and the conductive ground plane;

    a breathable washer disposed between facing surfaces of the hermetic insulator and the feedthrough capacitor, the breathable washer comprising a breathable material which allows a leak detection gas to pass therethrough during a standard pressurized or vacuum pull leak detection test and yet excludes movement of liquids, dissolved solids or solid contaminants therethrough;

    means for conductively coupling the first set of electrode plates to the terminal pin or lead wire; and

    means for conductively coupling the second set of electrode plates to the ground plane.

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