EMI feedthrough filter terminal assembly for human implant applications utilizing oxide resistant biostable conductive pads for reliable electrical attachments
DC CAFCFirst Claim
1. An EMI feedthrough filter terminal assembly, comprising:
- a feedthrough filter capacitor including first and second sets of electrode plates, a passageway therethrough having a first termination surface conductively coupling the first set of electrode plates, and a second termination surface exteriorly coupling the second set of electrode plates;
a conductive ferrule adjacent to the feedthrough filter capacitor;
at least one conductive terminal pin extending through the passageway in conductive relation with the first set of electrode plates, and through the ferrule in non-conductive relation;
an insulator fixed to the ferrule for conductively isolating the terminal pin from the ferrule; and
an oxide resistant conductive hermetic seal between the insulator and the ferrule, the oxide resistant conductive seal including an oxide resistant conductive pad on a surface of the ferrule conductively coupled to the second termination surface.
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Abstract
An EMI feedthrough filter terminal assembly includes a feedthrough filter capacitor having first and second sets of electrode plates, a passageway having a first termination surface conductively coupling the first set of electrode plates, and a second termination surface exteriorly coupling the second set of electrode plates. A conductive ferrule disposed adjacent to the capacitor includes a conductive pad of an oxide resistant biostable material on a surface thereof conductively coupled to the second termination surface. A conductive terminal pin extends through the passageway in conductive relation with the first set of electrode plates, and through the ferrule in non-conductive relation. An insulator is fixed to the ferrule for conductively isolating the terminal pin from the ferrule. A hermetic seal is disposed between the insulator and the ferrule. A second conductive pad may be conductively attached to the terminal pin and to the first termination surface independently of the lead wire.
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Citations
69 Claims
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1. An EMI feedthrough filter terminal assembly, comprising:
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a feedthrough filter capacitor including first and second sets of electrode plates, a passageway therethrough having a first termination surface conductively coupling the first set of electrode plates, and a second termination surface exteriorly coupling the second set of electrode plates;
a conductive ferrule adjacent to the feedthrough filter capacitor;
at least one conductive terminal pin extending through the passageway in conductive relation with the first set of electrode plates, and through the ferrule in non-conductive relation;
an insulator fixed to the ferrule for conductively isolating the terminal pin from the ferrule; and
an oxide resistant conductive hermetic seal between the insulator and the ferrule, the oxide resistant conductive seal including an oxide resistant conductive pad on a surface of the ferrule conductively coupled to the second termination surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An EMI feedthrough filter terminal assembly, comprising:
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a feedthrough filter capacitor including first and second sets of electrode plates, a passageway therethrough having a first termination surface conductively coupling the first set of electrode plates, and a plurality of second termination surfaces exteriorly coupling the second set of electrode plates;
a conductive ferrule adjacent to the feedthrough filter capacitor;
at least one conductive terminal pin extending through the passageway in conductive relation with the first set of electrode plates, and through the ferrule in non-conductive relation;
an insulator fixed to the ferrule for conductively isolating the terminal pin from the ferrule;
an oxide resistant hermetic seal between the insulator and the ferrule, the hermetic seal including a plurality of conductive pads of oxide resistant biostable material, on a surface of the ferrule conductively coupled to the plurality of second termination surfaces; and
conductive connectors extending between the respective second termination surfaces and the conductive pads. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 51, 52)
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- 49. The terminal assembly of 48, wherein the wire bond pad comprises a noble metal.
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53. An EMI feedthrough filter terminal assembly for use in medical implant applications, comprising:
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a feedthrough filter capacitor including first and second sets of electrode plates, a plurality of passageways therethrough each having a distinct first termination surface conductively coupled to a distinct first set of electrode plates, and a plurality of second termination surfaces exteriorly coupling the second set of electrode plates;
a conductive ferrule adjacent to the feedthrough filter capacitor;
a plurality of terminal pins corresponding with the number of passageways through the feedthrough filter capacitor, each terminal pin extending through a respective passageway in conductive relation with the corresponding distinct first set of electrode plates, and through the ferrule in non-conductive relation;
an insulator fixed to the ferrule for conductively isolating the terminal pins from the ferrule, wherein the ferrule and the insulator comprise a pre-fabricated hermetic terminal pin sub-assembly;
an oxide resistant hermetic seal between the insulator and the ferrule, the hermetic seal including a plurality of conductive pads of oxide resistant biostable material on a surface of the ferrule conductively coupled to the plurality of second termination surfaces; and
conductive connectors extending between each of the respective second termination surfaces and conductive pads. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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Specification