Low equivalent series resistance RF filter for an active implantable medical device
First Claim
1. A hermetically sealed filtered feedthrough assembly that is attachable to an opening of a housing of an active implantable medical device (AIMD), the filtered feedthrough assembly comprising:
- a) an electrically conductive ferrule comprising a ferrule opening, wherein the ferrule is configured to be attachable to an opening in a housing of an AIMD;
b) an insulator at least partially residing in the ferrule opening where a first gold braze hermetically seals the insulator to the ferrule, the insulator comprising an insulator outer surface extending to an insulator body fluid side and to an insulator device side, wherein, when the ferrule is attached to the housing of the AIMD, the insulator body fluid and device sides reside outside and inside the AIMD, respectively;
c) at least one insulator active via hole extending through the insulator to the insulator body fluid and device sides;
d) an electrically conductive active leadwire residing in the at least one insulator active via hole where a second gold braze hermetically seals the active leadwire to the insulator, the active leadwire extending from an active leadwire body fluid side portion to an active leadwire device side portion; and
e) a capacitor disposed adjacent to the insulator device side, the capacitor comprising;
i) a capacitor dielectric comprising a capacitor dielectric outer surface extending to a capacitor dielectric first side adjacent to the insulator device side and to a capacitor dielectric second side, wherein the capacitor dielectric supports at least one active electrode plate interleaved in a capacitive relationship with at least one ground electrode plate;
ii) a capacitor active metallization supported on the capacitor dielectric and being conductively connected to the at least one active electrode plate, wherein an active electrical connection conductively connects the active leadwire to the capacitor active metallization; and
iii) a capacitor ground metallization supported on the capacitor dielectric and being conductively connected to the at least one ground electrode plate, wherein a ground electrical connection conductively connects the capacitor ground metallization to the ferrule, andiv) wherein the capacitor dielectric has a dielectric constant k that is greater than 0, but less than 1000, andv) wherein the capacitor is the first filter capacitor conductively connected to the conductive leadwire device side portion at or adjacent to the insulator device side.
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Accused Products
Abstract
A hermetically sealed filtered feedthrough assembly includes an electrically conductive ferrule sealed by a first gold braze to an insulator disposed at least partially within a ferrule opening. A conductive wire is disposed within a via hole disposed through the insulator extending from a body fluid side to a device side. A second gold braze hermetically seals the conductive leadwire to the via hole. A capacitor is disposed on the device side having a capacitor dielectric body with a dielectric constant k that is greater than 0 and less than 1000. The capacitor is the first filter capacitor electrically connected to the conductive leadwire coming from the body fluid side into the device side. An active electrical connection electrically connects the conductive leadwire to the capacitor active metallization. A ground electrical connection electrically connects the capacitor ground metallization to the ferrule and housing of the active implantable medical device.
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Citations
30 Claims
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1. A hermetically sealed filtered feedthrough assembly that is attachable to an opening of a housing of an active implantable medical device (AIMD), the filtered feedthrough assembly comprising:
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a) an electrically conductive ferrule comprising a ferrule opening, wherein the ferrule is configured to be attachable to an opening in a housing of an AIMD; b) an insulator at least partially residing in the ferrule opening where a first gold braze hermetically seals the insulator to the ferrule, the insulator comprising an insulator outer surface extending to an insulator body fluid side and to an insulator device side, wherein, when the ferrule is attached to the housing of the AIMD, the insulator body fluid and device sides reside outside and inside the AIMD, respectively; c) at least one insulator active via hole extending through the insulator to the insulator body fluid and device sides; d) an electrically conductive active leadwire residing in the at least one insulator active via hole where a second gold braze hermetically seals the active leadwire to the insulator, the active leadwire extending from an active leadwire body fluid side portion to an active leadwire device side portion; and e) a capacitor disposed adjacent to the insulator device side, the capacitor comprising; i) a capacitor dielectric comprising a capacitor dielectric outer surface extending to a capacitor dielectric first side adjacent to the insulator device side and to a capacitor dielectric second side, wherein the capacitor dielectric supports at least one active electrode plate interleaved in a capacitive relationship with at least one ground electrode plate; ii) a capacitor active metallization supported on the capacitor dielectric and being conductively connected to the at least one active electrode plate, wherein an active electrical connection conductively connects the active leadwire to the capacitor active metallization; and iii) a capacitor ground metallization supported on the capacitor dielectric and being conductively connected to the at least one ground electrode plate, wherein a ground electrical connection conductively connects the capacitor ground metallization to the ferrule, and iv) wherein the capacitor dielectric has a dielectric constant k that is greater than 0, but less than 1000, and v) wherein the capacitor is the first filter capacitor conductively connected to the conductive leadwire device side portion at or adjacent to the insulator device side. - 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)
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29. A filtered feedthrough, comprising:
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a) an electrically conductive ferrule comprising a ferrule opening, wherein the ferrule is configured to be attachable to an opening in a housing of an active implantable medical device (AIMD); b) an insulator residing in the ferrule opening where a first gold braze hermetically seals the insulator to the ferrule, the insulator comprising an insulator outer surface extending to an insulator body fluid side and an insulator device side, wherein, when the ferrule is attached to the housing of an AIMD, the insulator body fluid and device sides reside outside and inside the AIMD, respectively; c) at least one insulator active via hole extending through the insulator to the insulator body fluid and device sides; d) an electrically conductive active leadwire residing in the at least one insulator active via hole where a second gold braze hermetically seals the active leadwire to the insulator, the active leadwire extending from an active leadwire body fluid side portion to an active leadwire device side portion; e) a capacitor disposed adjacent to the insulator device side, the capacitor comprising; i) a capacitor dielectric comprising a capacitor dielectric outer surface extending to a capacitor dielectric first side adjacent to the insulator device side and to a capacitor dielectric second side, wherein the capacitor dielectric supports at least one active electrode plate interleaved in a capacitive relationship with at least one ground electrode plate; ii) at least one capacitor active passageway extending through the capacitor dielectric to the capacitor dielectric first and second sides; iii) a capacitor active metallization supported on the capacitor dielectric in the at least one capacitor active passageway where the capacitor active metallization is conductively connected to the at least one active electrode plate, wherein the active leadwire device side portion resides in the at least one capacitor active passageway where an active electrical connection conductively connects the active leadwire to the capacitor active metallization; and iv) a capacitor ground metallization supported on the capacitor dielectric and being conductively connected to the at least one ground electrode plate, wherein a ground electrical connection conductively connects the capacitor ground metallization to the ferrule, and v) wherein the capacitor dielectric has a dielectric constant k that is greater than 0, but less than 1000, and vi) wherein the capacitor is the first filter capacitor conductively connected to the conductive leadwire device side portion at or adjacent to the insulator device side. - View Dependent Claims (30)
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Specification