Electromagnetic interference filter for implanted electronics
First Claim
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 plurality of signal electrodes are flush with the top and bottom surfaces, and wherein the EMI filter is configured to be coupled on said top surface of the filter to internal conductors of an implantable medical device and configured to be coupled on said bottom surface of the filter to external lead wires implanted within a body in which the medical device is implanted;
a plurality of ground electrodes arranged in parallel to each other and interposed between the plurality of signal electrodes, the plurality of ground electrodes grounded at least one of internally by being exposed on the top and bottom surfaces of the filter or externally by being exposed on a side surface of the filter;
dielectric material disposed between the plurality of signal electrodes and the plurality of ground electrodes to act as insulator material between adjacent signal and ground 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 an axis perpendicular to the longitudinal axis and the thickness; and
at least one metallization region 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 the filter acts as a shielding element to prevent unwanted electromagnetic interference with an input and output of the medical device.
1 Assignment
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Accused Products
Abstract
An electromagnetic interference filter for various electronic devices such as implantable medical devices is provided. A plurality of signal electrodes can be configured in an array, where each signal electrode extends vertically from a top surface to a bottom surface of the filter such that the signal electrodes are flush with the top and bottom surface. Ground or common electrodes can have a parallel arrangement and be interposed between the signal electrodes. The ground electrodes can be grounded internally, externally, or both internally and externally. Dielectric material can be disposed between signal electrodes and ground electrodes to act as an insulator between adjacent electrodes.
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Citations
32 Claims
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1. An electromagnetic interference (EMI) filter, comprising:
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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 plurality of signal electrodes are flush with the top and bottom surfaces, and wherein the EMI filter is configured to be coupled on said top surface of the filter to internal conductors of an implantable medical device and configured to be coupled on said bottom surface of the filter to external lead wires implanted within a body in which the medical device is implanted; a plurality of ground electrodes arranged in parallel to each other and interposed between the plurality of signal electrodes, the plurality of ground electrodes grounded at least one of internally by being exposed on the top and bottom surfaces of the filter or externally by being exposed on a side surface of the filter; dielectric material disposed between the plurality of signal electrodes and the plurality of ground electrodes to act as insulator material between adjacent signal and ground 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 an axis perpendicular to the longitudinal axis and the thickness; and at least one metallization region 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 the filter acts as a shielding element to prevent unwanted electromagnetic interference with an input and output of the medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An electromagnetic interference (EMI) filter, comprising:
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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 plurality of signal electrodes are flush with the top and bottom surfaces; a plurality of ground electrodes arranged in parallel to each other and interposed between the plurality of signal electrodes, the plurality of ground electrodes grounded at least one of internally by being exposed on the top and bottom surfaces of the filter or externally by being exposed on a side surface of the filter; dielectric material disposed between the plurality of signal electrodes and plurality of ground electrodes to act as insulator material between adjacent signal and ground 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 the longitudinal axis and the thickness; a passivation layer on at least one of a top and bottom surface of the EMI filter to prevent arcing between the plurality of signal electrode arrays; signal terminations applied to selected regions on the top and bottom surfaces of the EMI filter so as to connect the pluralities of signal electrodes and provide an interconnection surface for electrically attaching a signal with the filter; and ground terminations applied to selected regions on at least one of the top, bottom or side surfaces of the EMI filter so as to connect the pluralities of ground electrodes and provide an interconnection surface for electrically attaching ground to the filter; and wherein each of said plurality of signal electrodes 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 each of said plurality of ground electrodes 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. - View Dependent Claims (24, 25, 26)
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27. Methodology for use of an electromagnetic interference (EMI) filter with an implantable medical device, comprising the steps of:
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providing a plurality of signal electrodes for an EMI filter, 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 plurality of signal electrodes are flush with the top and bottom surfaces, and configured to be coupled on the top surface of the filter to internal conductors of an implantable medical device and coupled on the bottom surface of the filter to external lead wires implanted within a body in which the medical device is implanted; providing a plurality of ground electrodes arranged in parallel to each other and interposed between the plurality of signal electrodes, and extending through the filter between the top and bottom surfaces thereof, for grounding connections on the surfaces; applying metallization to selected regions on the top and bottom surfaces of the filter to connect respective arrays of the plurality of signal electrodes and provide an interconnection surface for electrically attaching the filter to other components; and disposing dielectric material between the plurality of signal electrodes and the plurality of ground electrodes to act as insulator material between adjacent signal and ground electrodes, and so as to collectively form with the plurality of signal electrodes, the plurality of ground electrodes, and dielectric material a filter which acts as a shielding element to prevent unwanted electromagnetic interference with an input and an output of the medical device. - View Dependent Claims (28, 29)
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30. An electromagnetic interference (EMI) filter system for use with an implantable medical device, comprising:
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a canister with a bushing for enclosing at least one end of the canister; a plurality of external connection wires passing through the bushing and coupling with an upper termination area of an EMI filter, and for connection with external circuitry of the implantable medical device; and a plurality of internal connection wires coupling with a bottom termination area of said EMI filter, and for connection with internal circuitry of the implantable medical device; wherein the EMI filter includes; a plurality of signal electrodes arranged in an array, wherein each signal electrode extends from a top surface to a bottom surface of the filter such that the plurality of signal electrodes are flush with the top and bottom surfaces of the filter; a plurality of ground electrodes arranged in parallel to each other and interposed between the plurality of signal electrodes, and arranged so as to be connected to at least one location on each of the top and bottom surfaces of the filter; and dielectric material disposed between the plurality of signal electrodes and the plurality of ground electrodes to act as insulator material between adjacent signal and ground 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 the longitudinal axis and the thickness; and the upper termination area comprises respective termination surfaces coupled with the plurality of signal electrodes and coupled with the plurality of ground electrodes, and the bottom termination area comprises respective termination surfaces coupled with the plurality of signal electrodes and coupled with the plurality of ground electrodes, so that the filter acts as a shielding element to prevent unwanted electromagnetic interference with an input and output of the implanted medical device; each of said plurality of signal electrodes 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 each of said plurality of ground electrodes 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. - View Dependent Claims (31, 32)
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Specification