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Leak testable capacitive filtered feedthrough for an implantable medical device

  • US 6,349,025 B1
  • Filed: 10/25/2000
  • Issued: 02/19/2002
  • Est. Priority Date: 11/30/1999
  • Status: Active Grant
First Claim
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1. A leak testable, filtered electrical feedthrough, comprising:

  • an insulator having an insulator through-hole extending between an upper insulator surface and a lower insulator surface and having an outer insulator surface;

    a conductive feedthrough pin extending through the insulator through-hole and hermetically sealed with the insulator;

    a conductive ferrule having a ferrule inner wall hermetically sealed with and surrounding the outer insulator surface;

    a filter element fitted between and electrically attached with said feedthrough pin and said conductive ferrule above said insulator and having an upper filter element surface and a lower filter element surface spaced apart from said upper insulator surface;

    a non-conductive, pre-formed spacer fitted within an interior space between said lower filter element surface and said upper insulator surface and about said feedthrough pin that electrically insulates the lower filter element surface and separates it from the insulator; and

    means for providing a gas pathway extending from said interior space to the exterior of said filtered electrical feedthrough bypassing said filter element, whereby leak test gas applied to said lower insulator surface and passing through defects in said insulator is passed through the gas pathway bypassing said filter element to enable a determination that the insulator is not hermetically sealed.

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