Feed-through filter assembly having varistor and capacitor structure
First Claim
1. A feed-through filter comprising:
- a conductive mounting element;
at least one elongate terminal member maintained in electrically insulated relation with respect to said conductive mounting element;
a varistor structure supported by said conductive mounting element and defining a respective feedthrough hole through which said elongate terminal member extends, said varistor structure having a plurality of first polarity plates interleaved with a plurality of second polarity plates; and
said first polarity plates being electrically connected to said elongate terminal member and said second polarity plates being electrically connected to said conductive mounting element.
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Accused Products
Abstract
A feed-through filter assembly such as may be used in an implantable medical device. The assembly includes a conductive mounting element which may be hermetically sealed to an outer housing of the implantable medical device. In many embodiments, the conductive mounting element will be a conductive canister in which a feed-through filter structure is located. Alternatively, the conductive mounting element may include a suitable subplate structure. Because the filter structure exhibits both varistor and capacitive characteristics, effective transient suppression and interference filtering is achieved in a single package. Secondary filtering may be provided downstream of the filter assembly for additional interference filtering at lower frequencies.
159 Citations
30 Claims
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1. A feed-through filter comprising:
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a conductive mounting element; at least one elongate terminal member maintained in electrically insulated relation with respect to said conductive mounting element; a varistor structure supported by said conductive mounting element and defining a respective feedthrough hole through which said elongate terminal member extends, said varistor structure having a plurality of first polarity plates interleaved with a plurality of second polarity plates; and said first polarity plates being electrically connected to said elongate terminal member and said second polarity plates being electrically connected to said conductive mounting element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A feed-through filter comprising:
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a conductive canister; at least one elongate terminal member maintained in electrically insulated and hermetically sealed relation with respect to said conductive canister; a discoidal varistor structure supported by said conductive mounting element and defining a respective feedthrough hole through which said elongate terminal member extends, said varistor structure having at least one first polarity plate situated in respective opposition to at least one second polarity plate; and said first polarity plate being electrically connected to said elongate terminal member and said second polarity plate being electrically connected to said conductive canister. - View Dependent Claims (12, 13, 14, 15)
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16. A filtering arrangement for use in an implantable medical device, said arrangement comprising:
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a conductive mounting element adapted to be connected to an outer shell of said implantable medical device in hermetically sealed relation therewith; at least one elongate terminal member maintained in electrically insulated and hermetically sealed relation with respect to said conductive mounting element; a first filter structure supported by said conductive mounting element and operative to provide transient suppression and to filter interference signals carried by said elongate terminal member above another predetermined threshold frequency; said first filter structure having a first polarity terminal electrically connected to said elongate terminal member and a second polarity terminal electrically connected to said conductive mounting element; and a second filter structure having a first polarity terminal electrically connected to said elongate terminal member, said second filter structure operative to filter interference signals carried by said elongate terminal member below said predetermined threshold frequency. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A feed-through filter comprising:
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a conductive mounting plate; a plurality of elongate terminal members maintained in electrically insulated relation with respect to said conductive mounting plate; a varistor array structure supported by said conductive mounting plate and defining a plurality of feedthrough holes through which said elongate terminal members respectively extend; said varistor array structure including a plurality of varistor devices each associated with a respective one of said elongate terminal members, each of said varistor devices having at least one first polarity plate electrically connected to said one of said elongate terminal members, each of said varistor devices further comprising at least one second polarity plate electrically connected to said conductive mounting plate. - View Dependent Claims (29, 30)
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Specification