Low impedance oxide resistant grounded capacitor for an AIMD
First Claim
1. A hermetically sealed filtered feedthrough assembly for an implantable medical device, the filtered feedthrough assembly comprising:
- a) an insulator of electrically non-conductive material, the insulator comprising an outer insulator surface extending longitudinally from a first insulator end to a second insulator end, wherein the insulator has at least one conductor bore extending there through to the first and second insulator ends;
b) a ferrule of an electrically conductive material, the ferrule comprising a ferrule sidewall defining a ferrule opening, wherein the insulator is hermetically sealed to the conductive ferrule sidewall in the ferrule opening;
c) a conductor comprising an electrically conductive material extending from a first conductor end to a second conductor end, wherein the conductor is hermetically sealed and disposed through the conductor bore in the insulator and in a non-conductive relation with the conductive ferrule;
d) a filter capacitor, comprising;
i) a dielectric comprising an outer dielectric surface extending longitudinally from a first dielectric end to a second dielectric end;
ii) at least one active electrode plate supported by the dielectric in an interleaved, partially overlapping relationship with at least one ground electrode plate; and
iii) at least one terminal pin bore extending through the dielectric to the first and second dielectric ends,iv) wherein the second dielectric end is disposed adjacent to the first insulator end;
e) a first metallization electrically contacted to the at least one active electrode plate in the terminal in bore;
f) a first electrical connection electrically coupling the first metallization to the conductor extending through the terminal pin bore in the dielectric;
g) a second metallization electrically contacted to the at least one ground electrode plate at at least a portion of the outer dielectric surface; and
h) a second electrical connection electrically coupling the second metallization to the ferrule, wherein the second electrical connection comprises;
i) at least one oxide-resistant metal addition supported by the ferrule adjacent to the second metallization;
ii) a first conductive material electrically and physically coupling a first portion of the oxide-resistant metal addition directly to the ferrule; and
iii) a second conductive material electrically and physically coupling a second portion of the oxide-resistant metal addition to the second metallization at the outer dielectric surface of the filter capacitor,iv) wherein the first and second conductive materials are different.
4 Assignments
0 Petitions
Accused Products
Abstract
A hermetically sealed filtered feedthrough assembly for an AIMD includes an insulator hermetically sealed to a conductive ferrule or housing. A conductor is hermetically sealed and disposed through the insulator in non-conductive relation to the conductive ferrule or housing between a body fluid side and a device side. A feedthrough capacitor is disposed on the device side. A first low impedance electrical connection is between a first end metallization of the capacitor and the conductor. A second low impedance electrical connection is between a second end metallization of the capacitor and the ferrule or housing. The second low impedance electrical connection includes an oxide-resistant metal addition attached directly to the ferrule or housing and an electrical connection coupling the second end metallization electrically and physically directly to the oxide-resistant metal addition.
434 Citations
33 Claims
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1. A hermetically sealed filtered feedthrough assembly for an implantable medical device, the filtered feedthrough assembly comprising:
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a) an insulator of electrically non-conductive material, the insulator comprising an outer insulator surface extending longitudinally from a first insulator end to a second insulator end, wherein the insulator has at least one conductor bore extending there through to the first and second insulator ends; b) a ferrule of an electrically conductive material, the ferrule comprising a ferrule sidewall defining a ferrule opening, wherein the insulator is hermetically sealed to the conductive ferrule sidewall in the ferrule opening; c) a conductor comprising an electrically conductive material extending from a first conductor end to a second conductor end, wherein the conductor is hermetically sealed and disposed through the conductor bore in the insulator and in a non-conductive relation with the conductive ferrule; d) a filter capacitor, comprising; i) a dielectric comprising an outer dielectric surface extending longitudinally from a first dielectric end to a second dielectric end; ii) at least one active electrode plate supported by the dielectric in an interleaved, partially overlapping relationship with at least one ground electrode plate; and iii) at least one terminal pin bore extending through the dielectric to the first and second dielectric ends, iv) wherein the second dielectric end is disposed adjacent to the first insulator end; e) a first metallization electrically contacted to the at least one active electrode plate in the terminal in bore; f) a first electrical connection electrically coupling the first metallization to the conductor extending through the terminal pin bore in the dielectric; g) a second metallization electrically contacted to the at least one ground electrode plate at at least a portion of the outer dielectric surface; and h) a second electrical connection electrically coupling the second metallization to the ferrule, wherein the second electrical connection comprises; i) at least one oxide-resistant metal addition supported by the ferrule adjacent to the second metallization; ii) a first conductive material electrically and physically coupling a first portion of the oxide-resistant metal addition directly to the ferrule; and iii) a second conductive material electrically and physically coupling a second portion of the oxide-resistant metal addition to the second metallization at the outer dielectric surface of the filter capacitor, iv) wherein the first and second conductive materials are different. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A hermetically sealed filtered feedthrough assembly for an implantable medical device, the filtered feedthrough assembly comprising:
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a) a ferrule comprising a conductive peninsula or extension; b) an insulator hermetically sealed to the conductive ferrule; c) a conductor hermetically sealed and disposed through the insulator in non-conductive relation to the conductive ferrule between a body fluid side and a device side; d) a feedthrough capacitor located on the device side, the feedthrough capacitor comprising a first and a second end metallization, wherein the first end metallization is connected to at least one active electrode plate and wherein the second end metallization is connected to at least one ground electrode plate, wherein the at least one active electrode plate is interleaved and disposed parallel to the at least one ground electrode plate, wherein the at least one active and ground electrode plates are disposed within a capacitor dielectric; e) a first low impedance electrical connection between the first end metallization and the conductor; f) a ground conductor disposed through the feedthrough capacitor in non-conductive relation with the at least one ground and active electrode plates, where the ground conductor is electrically coupled to the conductive peninsular or extension; and g) an oxide-resistant metal addition attached directly at one end to the ground conductor and connected at the other end to the second end metallization of the feedthrough capacitor.
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23. A hermetically sealed filtered feedthrough assembly for an implantable medical device, the filtered feedthrough assembly comprising:
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a) an insulator of electrically non-conductive material, the insulator comprising an outer insulator surface extending longitudinally from a first insulator end to a second insulator end, wherein the insulator has at least one conductor bore extending there through to the first and second insulator ends; b) a ferrule of an electrically conductive material, the ferrule comprising′
a ferrule sidewall including a peninsula and defining a ferrule opening, wherein the insulator is hermetically sealed to the conductive ferrule in the ferrule opening;c) a conductor comprising an electrically conductive material extending from a first conductor end to a second conductor end, wherein the conductor is hermetically sealed and disposed through the conductor bore in the insulator and in a non-conductive relation with the conductive ferrule; d) a filter capacitor located adjacent to the first insulator end, the filter capacitor comprising; i) a dielectric comprising an outer dielectric surface extending longitudinally from a first dielectric end to a second dielectric end; ii) at least one active electrode plate supported by the dielectric in an interleaved, partially overlapping relationship with at least one ground electrode plate; and iii) at least one terminal pin bore extending through the dielectric to the first and second dielectric ends, iv) wherein the second dielectric end is disposed adjacent to the first insulator side; e) a first metallization electrically contacted to the at least one active electrode plate in the terminal pin bore; f) a first electrical connection electrically coupling the first metallization to the conductor extending through the terminal pin bore in the dielectric; g) a second metallization electrically contacted to the at least one ground electrode plate at the outer dielectric surface; h) a ground conductor disposed through the filter capacitor in non-conductive relation with the at least one ground and active electrode plates, wherein the ground conductor is electrically coupled to the conductive peninsula; and i) a second electrical connection electrically coupling the second metallization to the ferrule, wherein the second electrical connection comprises; i) at least one noble-metal addition supported by the ferrule adjacent to the second metallization, wherein the noble-metal addition is selected from the group consisting of gold, platinum, palladium, silver, and combinations thereof; ii) a first conductive material electrically and physically coupling a first portion of the oxide-resistant metal addition to the ferrule; and iii) a second conductive material electrically and physically coupling a second portion of the noble metal addition to the second metallization at the outer dielectric surface of the filter capacitor, iv) wherein the first and second conductive materials are different. - View Dependent Claims (24, 25, 26, 27)
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28. An implantable medical device, comprising:
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a) a thermally or electrically conductive AIMD housing containing at least one of tissue-stimulating and biological-sensing circuits for the AIMD, wherein the housing has an opening providing passage from a body fluid side outside the housing to a device side inside the housing; and b) a filtered feedthrough assembly hermetically sealed in the housing opening, the filtered feedthrough assembly comprising; i) an insulator of electrically non-conductive material, the insulator comprising an outer insulator surface extending from a body fluid side insulator end to a device side insulator end, wherein the insulator has at least one conductor bore extending there through to the body fluid and device side insulator ends; ii) a ferrule of an electrically conductive material electrically and physically connected to the housing in the housing opening, the ferrule comprising a ferrule sidewall having an inner ferrule sidewall surface defining a ferrule opening and an outer ferrule sidewall surface hermetically sealed to the device housing, wherein the insulator is received in the ferrule opening and hermetically sealed to the ferrule at the inner ferrule surface; iii) a conductor comprising an electrically conductive material extending from a body fluid side conductor end to a device side conductor end, wherein the conductor is hermetically sealed and disposed through the conductor bore in the insulator and in a non-conductive relation with the conductive ferrule; iv) a filter capacitor, comprising; A) a dielectric comprising an outer dielectric surface extending from a first dielectric end to a second dielectric end; B) at least one active electrode plate supported by the dielectric in an interleaved, partially overlapping relationship with at least one ground electrode plate; and C) at least one terminal pin bore extending through the dielectric to the first and second dielectric ends, D) wherein the second end of the capacitor dielectric is located adjacent to the device side of the insulator; v) a first metallization electrically contacted to the at least one active electrode plate in the terminal pin bore; vi) a first electrical connection electrically coupling the first metallization to the conductor in the terminal pin bore extending through the dielectric; vii) a second metallization electrically contacted to the at least one ground electrode plate at the outer dielectric surface; and viii) a second electrical connection electrically coupling the second metallization to the ferrule, wherein the second electrical connection comprises; A) at least one oxide-resistant metal addition supported by the ferrule adjacent to the second metallization; B) a first conductive material electrically and physically coupling a first portion of the oxide-resistant metal addition directly to the ferrule hermetically sealed to the device housing; and C) a second conductive material electrically and physically coupling a second portion of the oxide-resistant metal addition to the second metallization at the outer dielectric surface of the filter capacitor, D) wherein the first and second conductive materials are different. - View Dependent Claims (29, 30, 31, 32)
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33. A hermetically sealed filtered feedthrough assembly for an implantable medical device, the filtered feedthrough assembly comprising:
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a) an insulator of electrically non-conductive material, the insulator comprising an outer insulator surface extending from a first insulator end to a second insulator end, wherein the insulator has at least one conductor bore extending there through to the first and second insulator ends; b) a ferrule of an electrically conductive material, the ferrule comprising a ferrule sidewall defining a ferrule opening, wherein the insulator is hermetically sealed to the conductive ferrule sidewall in the ferrule opening; c) a conductor comprising an electrically conductive material extending from a first conductor end to a second conductor end, wherein the conductor is hermetically sealed and disposed through the conductor bore in the insulator and in a non-conductive relation with the conductive ferrule; d) a filter capacitor, comprising; i) a dielectric comprising an outer dielectric surface extending from a first dielectric end to a second dielectric end; ii) at least one active electrode plate supported by the dielectric in an interleaved, partially overlapping relationship with at least one ground electrode plate; and iii) at least one terminal pin bore extending through the dielectric to the first and second dielectric ends, iv) wherein the second dielectric end is disposed adjacent to the first insulator end; e) a first metallization electrically contacted to the at least one active electrode plate in the terminal pin bore; f) a first electrical connection electrically coupling the first metallization to the conductor extending through the terminal pin bore in the dielectric; g) a second metallization electrically contacted to the at least one ground electrode plate at the outer dielectric surface; and h) a second electrical connection electrically coupling the second metallization to the ferrule, wherein the second electrical connection comprises; i) at least one noble-metal addition supported by the ferrule adjacent to the second metallization, wherein the noble-metal addition is selected from the group consisting of gold, platinum, palladium, silver, and combinations thereof; ii) a weld portion of the oxide-resistant metal addition electrically and physically coupling to the ferrule; and iii) a solder or thermal-setting material electrically and physically coupling a second portion of the oxide-resistant metal addition to the second metallization at the outer dielectric surface of the filter capacitor.
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Specification