Metallurgically bonded gold pocket pad for grounding an EMI filter to a hermetic terminal for an active implantable medical device
First Claim
1. A filtered feedthrough that is attachable to an active implantable medical device (AIMD), the filtered feedthrough comprising:
- a) a titanium ferrule configured to be installed in an opening of a housing of the AIMD, the ferrule comprising;
i) a conductive ferrule body separating a ferrule body fluid side end surface opposite a ferrule device side end surface, wherein, when the ferrule is installed in the opening of the AIMD housing, the ferrule body fluid side end surface and the ferrule device side end surface reside outside the housing and inside the housing, respectively;
ii) at least one surface disposed on the ferrule device side end surface;
iii) a ferrule opening passing through the at least one surface and extending to the ferrule body fluid side end surface and to the ferrule device side end surface; and
iv) at least one pocket provided in the at least one surface disposed on the ferrule device side end surface; and
b) an insulator hermetically sealed in the ferrule opening by a first gold braze, the insulator having at least one via hole extending through the insulator to an insulator body fluid side and to an insulator device side, wherein the insulator comprises alumina ceramic;
c) at least one conductive pathway disposed through and hermetically sealed to the insulator in the at least one via hole;
d) a gold pocket-pad disposed within the at least one pocket in the ferrule device side end surface;
e) wherein the first gold braze and gold pocket-pad do not physically touch one another; and
f) a filter capacitor disposed on the ferrule device side end surface, the filter capacitor comprising;
i) at least one active electrode plate disposed parallel and spaced from at least one ground electrode plate, wherein the active and ground electrode plates are disposed within a capacitor dielectric substrate;
ii) a first passageway disposed through the capacitor dielectric substrate;
iii) a capacitor active metallization disposed within the first passageway and being electrically connected to the at least one active electrode plate, but in a non-conductive relation with the at least one ground electrode plate; and
iv) a capacitor ground metallization disposed on an outer surface of the capacitor dielectric substrate and being electrically connected to the at least one ground electrode plate, but in a non-conductive relation with the at least one active electrode plate; and
g) wherein the at least one conductive pathway is electrically connected to the capacitor active metallization; and
h) an electrical connection material electrically connecting the capacitor ground metallization to the gold pocket-pad disposed within the at least one pocket of the ferrule device side end surface.
3 Assignments
0 Petitions
Accused Products
Abstract
A feedthrough subassembly for an active implantable medical device includes a metallic ferrule having a conductive ferrule body, at least one surface disposed on a device side, and a ferrule opening passing through the at least one surface. An insulator body hermetically seals the ferrule opening of the conductive ferrule body by at least one of a first gold braze ceramic seal, a glass seal or a glass-ceramic seal. At least one hermetically sealed conductive pathway is disposed through the insulator body. At least one pocket formed in the at least one surface has a gold pocket pad disposed within. When the first gold braze ceramic seal is present, the first gold braze ceramic seal and the gold pocket pad are not physically touching one another.
570 Citations
25 Claims
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1. A filtered feedthrough that is attachable to an active implantable medical device (AIMD), the filtered feedthrough comprising:
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a) a titanium ferrule configured to be installed in an opening of a housing of the AIMD, the ferrule comprising; i) a conductive ferrule body separating a ferrule body fluid side end surface opposite a ferrule device side end surface, wherein, when the ferrule is installed in the opening of the AIMD housing, the ferrule body fluid side end surface and the ferrule device side end surface reside outside the housing and inside the housing, respectively; ii) at least one surface disposed on the ferrule device side end surface; iii) a ferrule opening passing through the at least one surface and extending to the ferrule body fluid side end surface and to the ferrule device side end surface; and iv) at least one pocket provided in the at least one surface disposed on the ferrule device side end surface; and b) an insulator hermetically sealed in the ferrule opening by a first gold braze, the insulator having at least one via hole extending through the insulator to an insulator body fluid side and to an insulator device side, wherein the insulator comprises alumina ceramic; c) at least one conductive pathway disposed through and hermetically sealed to the insulator in the at least one via hole; d) a gold pocket-pad disposed within the at least one pocket in the ferrule device side end surface; e) wherein the first gold braze and gold pocket-pad do not physically touch one another; and f) a filter capacitor disposed on the ferrule device side end surface, the filter capacitor comprising; i) at least one active electrode plate disposed parallel and spaced from at least one ground electrode plate, wherein the active and ground electrode plates are disposed within a capacitor dielectric substrate; ii) a first passageway disposed through the capacitor dielectric substrate; iii) a capacitor active metallization disposed within the first passageway and being electrically connected to the at least one active electrode plate, but in a non-conductive relation with the at least one ground electrode plate; and iv) a capacitor ground metallization disposed on an outer surface of the capacitor dielectric substrate and being electrically connected to the at least one ground electrode plate, but in a non-conductive relation with the at least one active electrode plate; and g) wherein the at least one conductive pathway is electrically connected to the capacitor active metallization; and h) an electrical connection material electrically connecting the capacitor ground metallization to the gold pocket-pad disposed within the at least one pocket of the ferrule device side end surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A filtered feedthrough that is attachable to an active implantable medical device (AIMD), the filtered feedthrough comprising:
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a) a titanium ferrule configured to be installed in an opening of a housing of the AIMD, the ferrule comprising; i) a ferrule first end surface opposite a ferrule second end surface; ii) a ferrule opening extending to the ferrule first end surface and to the ferrule second end surface; iii) at least one pocket formed in the ferrule first end surface; and iv) a gold pocket-pad disposed within the at least one pocket; and b) an insulator hermetically sealed in the ferrule opening, the insulator having at least one via hole extending to an insulator first side and to an insulator second side, wherein the insulator first and second sides are adjacent to the ferrule first and second end surfaces, respectively, and wherein the hermetic seal of the insulator to the ferrule and the gold pocket-pad do not physically touch each other; and c) at least one conductive pathway disposed through and hermetically sealed to the insulator in the at least one via hole; and d) an internally grounded filter capacitor disposed on the ferrule device side end surface, the internally grounded filter capacitor comprising; i) a capacitor dielectric supporting at least one active electrode plate in a capacitive relationship with at least one ground electrode plate; ii) a first passageway disposed through the capacitor dielectric; iii) a capacitor active conductor disposed within the first passageway and being electrically connected to the at least one active electrode plate; iv) a second passageway disposed through the capacitor dielectric; and v) a capacitor ground conductor disposed within the second passageway and being electrically connected to the at least one ground electrode plate; and f) an active electrical connection material conductively connecting the at least one conductive pathway in the insulator to the capacitor active conductor; and g) a ground electrical connection material conductively connecting the capacitor ground conductor to the gold pocket-pad disposed within the at least one pocket in the ferrule device side end surface. - View Dependent Claims (13)
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14. A feedthrough that is attachable to an active implantable medical device (AIMD), the feedthrough comprising:
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a) a titanium ferrule configured to be installed in an opening of a housing of the AIMD, the ferrule comprising; i) a ferrule first end surface opposite a ferrule second end surface; ii) a ferrule opening extending to the ferrule first end surface and to the ferrule second end surface; iii) at least one pocket formed in the ferrule first end surface; and iv) a gold pocket-pad disposed within the at least one pocket; and b) an insulator hermetically sealed in the ferrule opening by a first gold braze, the insulator having at least one via hole extending to an insulator first side and to an insulator second side, wherein the insulator first and second sides are adjacent to the ferrule first and second end surfaces, respectively, and wherein the first gold braze and gold pocket-pad do not physically touch each other; and c) at least one conductive pathway disposed through and hermetically sealed to the insulator in the at least one via hole. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification