Internal cermet routing for complex feedthroughs

Patent metadata

Field	Value
Publication number	US-10413639-B2
Application number	US-201816151821-A
Country	US
Kind code	B2
Filing date	Oct 4, 2018
Priority date	Oct 5, 2017
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

One aspect relates to a composite, including a ceramic body having a first layer surface and a second layer surface and at least one cermet conductor that electrically connects the surfaces. The composite includes a first layer with the first layer surface, a first ceramic, a first hole and a first cermet element in the first hole, a second layer with the second layer surface, a second ceramic, a second hole and a second cermet element in the second hole, and an intermediate layer that is located between the first and the second layer. The intermediate layer includes an intermediate layer ceramic, an intermediate hole and one intermediate cermet element in the intermediate hole. A projection of the cross-section of the first hole and a projection of the cross section of the second hole onto a plane Px,y are arranged offset to each other.

First claim

What is claimed is:

1. A composite, comprising:
a ceramic body having a first layer surface and a second layer surface and
at least one cermet conductor that electrically connects the first layer surface and the second layer surface,
wherein the composite has a layer sequence that comprises as layers:
i) a first layer with the first layer surface, wherein the first layer comprises a first ceramic, a first hole and a first cermet element comprised in the first hole;
ii) a second layer with the second layer surface, wherein the second layer comprises a second ceramic, a second hole and a second cermet element comprised in the second hole; and
iii) at least one intermediate layer located between the first and the second layer, wherein the at least one intermediate layer comprises an intermediate ceramic, at least one intermediate hole and at least one intermediate cermet element comprised in the at least one intermediate hole;

wherein a projection of a cross-section of the first hole and a projection of a cross section of the second hole onto a plane P x,y are arranged offset to each other;
wherein the ceramic body comprises the ceramic of the individual layers; and
wherein the at least one cermet conductor is an electrical connection between the first cermet element and the second cermet element via the at least one intermediate cerment element and wherein the electrical connection is accomplished by an at least partial overlap of cermet elements in layers that are located adjacent to each other.

2. The composite according to claim 1 , wherein the layer sequence of the composite comprises at least 2 intermediate layers that are arranged on top of each other forming an interlayer stack that is located between the first and the second layer, wherein the electrical connection within the layer stack is accomplished by an at least partial overlap of the intermediate cermet elements in intermediate layers that are located adjacent to each other.

3. The composite according to claim 1 , wherein the center of a projection of the cross section of the first hole onto a plane P x,y is located at position x 1 ,y 1 , the center of a projection of the cross section of the second hole onto the plane P x,y is located at position x 2 ,y 2 , and wherein
x 1 ≠x 2 and y 1 =y 2 ,
x 1 ≠x 2 and y 1 ≠y 2 , or
x 1 =x 2 and y 1 ≠y 2 .

4. The composite according to claim 1 , wherein a cross section of the projection of at least one intermediate hole onto the plane P x,y has a length L and a width W, with L≥2×W.

5. The composite according to claim 4 , wherein at least one intermediate hole comprises, at least at one end of the at least one intermediate hole, a portion that in a projection onto plane P x,y has a geometrical shape with a width W portion , wherein W portion >W and wherein the at least partial overlap of intermediate cermet element in the intermediate layers that are located adjacent to each other is formed in the area of this portion.

6. The composite according to claim 5 , wherein the portion has in a projection onto plane P x,y the form of a circle having a diameter W portion .

7. The composite according to claim 6 , wherein the at least one intermediate hole has in a projection onto plane P x,y the form of a dumbbell.

8. The composite according to claim 1 , wherein at least one intermediate cermet element is an elongated body having a length L in the range from 20 to 10000 μm and a width W in the range from 10 to 1000 μm.

9. The composite according to claim 1 , wherein the ceramic body and the conductor are each in one piece.

10. The composite according to claim 1 , wherein the composite is coupled between an electrode and an implantable electrical medical device to electrically connect them.

11. A method for producing a composite, comprising:
I) providing a first ceramic green sheet, comprising a first hole and a first ceramic green sheet surface, filling the first hole with a first cermet precursor composition and drying the first cermet precursor composition;
II) providing at least one intermediate ceramic green sheet, comprising at least one intermediate hole, filling the at least one intermediate hole with an intermediate cermet precursor composition and drying the intermediate cermet precursor composition;
III) providing a second ceramic green sheet, comprising a second hole and a second ceramic green sheet surface, filling the second hole with a second cermet precursor composition and drying the second cermet precursor composition;
IV) arranging the first ceramic green sheet, the at least one intermediate ceramic green sheet and the second ceramic green sheet in a sequence such that the at least one intermediate ceramic green sheet is located between the first and the second ceramic green sheet;
V) firing the sequence of ceramic green sheets thereby obtaining a composite comprising a ceramic body and a cermet conductor
wherein the holes in the individual green sheets are located and formed in such a way that:
a projection of the cross section of the first hole and a projection of the cross-section of the second hole onto a plane P x,y are arranged offset to each other; and
in the ceramic body the cermet conductor is formed by an electrical connection between the first cermet element that in V) is formed in the first hole and the second cermet element that in V) is formed in the second hole via the at least one intermediate cerment element that in V) is formed in the at least one intermediate hole and wherein the electrical connection is accomplished by an at least partial overlap of the cermet elements in the layers that are located adjacent to each other.

12. The method according to claim 11 , wherein in II) at least 2 intermediate ceramic green sheets are provided, wherein in IV) the at least 2 intermediate ceramic green sheets are arranged on top of each other forming an intermediate ceramic green sheet stack that is located between the first and the second ceramic green sheet, wherein the electrical connection within the intermediate layer stack that in V) is derived from the intermediate ceramic green sheet stack is accomplished by an at least partial overlap of the intermediate cermet elements in intermediate layers that are located adjacent to each other.

13. The method according to claim 11 , wherein in the composite the center of a projection of the cross section of the first hole onto a plane P x,y is located at position x 1 ,y 1 and the center of a projection of the cross section of second hole onto plane P x,y is located at position x 2 ,y 2 , wherein
x 1 ≠x 2 and y 1 =y 2 ,
x 1 ≠x 2 and y 1 ≠y 2 or
x 1 =x 2 and y 1 ≠y 2 .

14. The method according to claim 11 , wherein a cross section of the projection of at least one intermediate hole onto the plane P x,y has a length L and a width W, with L≥2×W, and wherein at least one intermediate cermet element is an elongated body having a length L in the range from 20 to 10000 μm and a width W in the range from 10 to 1000 μm.

15. A composite obtainable by the method according to claim 11 .

16. A device comprising a housing, an inner volume, an outer volume, and the composite according to claim 1 ;
wherein the housing
α1) encloses the inner volume,
α2) separates the inner volume from the outer volume, and
α3) comprises an aperture,
wherein the aperture frames the composite.

Assignees

• Heraeus Deutschland Gmbh & Co Kg

Inventors

• Dittmer Robert
• Hausch Ulrich
• Trötzschel Jens
• Herzog Peter
• Roth Josef

Classifications

• C04B41/80

  of only ceramics · CPC title

• C04B41/4578

  Coating or impregnating of green ceramics or unset concrete · CPC title

• A61N1/37512

  Pacemakers · CPC title

• A61N1/3754 Primary

  Feedthroughs · CPC title

• C04B41/0072

  Heat treatment · CPC title