Ceramic bushing with inductive filter

• US 8,825,162 B2
• Filed: 01/30/2012
• Issued: 09/02/2014
• Est. Priority Date: 01/31/2011
• Status: Active Grant

• Current Assignee: Heraeus Deutschland GmbH & Co. KG (Heraeus Holding GMBH)
• Original Assignee: Heraeus Precious Metals GmbH & Co. KG (Einhorn Verwaltungsgesellschaft mbH)
• Inventors: Reisinger, Andreas
• Primary Examiner(s): Thompson, Timothy
• Assistant Examiner(s): PIZZUTO, CHARLES M
• Application Number:
  US13/361,383
• Publication Number:
  US 20120197335A1
• Time in Patent Office: 946 Days
• Field of Search: 607/37, 333/182
• US Class Current: 607/37
• CPC Class Codes: A61N 1/3754 Feedthroughs
• CPC Class Codes: H01G 11/30 characterised by their material
• CPC Class Codes: H01P 11/007 Manufacturing frequency-selective devices resonators H01P11/008
• CPC Class Codes: H01R 43/16 for manufacturing contact members, e.g. by punching and by bending
• CPC Class Codes: H03H 7/0138 Electrical filters or coupling circuits
• CPC Class Codes: H03H 9/54 comprising resonators of piezoelectric or electrostrictive material H03H9/64 takes precedence
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y10T 29/49018 with other electrical component
• CPC Class Codes: Y10T 29/49204 Contact or terminal manufacturing

Abstract

One aspect relates to an electrical bushing for use in a housing of an implantable medical device. The electrical bushing includes at least one electrically insulating base body and at least one electrical conducting element. The conducting element is set up to establish, through the base body, at least one electrically conductive connection between an internal space of the housing and an external space. The conducting element is hermetically sealed with respect to the base body. The at least one conducting element includes at least one cermet. The electrical bushing includes an electrical filter structure. The at least one conducting element forms at least one conducting section of an inductor of the filter structure.

Claims

1. An electrical bushing for use in a housing of an implantable medical device,

whereby the electrical bushing comprises at least one electrically insulating base body and at least one electrical conducting element;

whereby the at least one electrical conducting element is set up to establish, through the base body, at least one electrically conductive connection between an internal space of the housing and an external space;

whereby the at least one electrical conducting element is hermetically sealed with respect to the base body; and

whereby the at least one electrical conducting element comprises at least one cermet to seal the at least one electrical conducting element directly to the base body without the use of braze or solder;

characterized in that the electrical bushing comprises an electrical filter structure, whereby the at least one electrical conducting element provides at least one conducting section of an inductor of the filter structure.

2. The electrical bushing according to claim 1, whereby the at least one conducting section is provided to have a longitudinal extension that deviates from a straight line.

3. The electrical bushing according to claim 1, whereby the at least one conducting section provides at least one part of a turn of the inductor and has an arc shape or at one kink.

4. The electrical bushing according to claim 3, whereby the at least one conducting section extends in two or three different directions in space, and follows, a repetitive triangular, trapezoidal or rectangular profile or follows a helix.

5. The electrical bushing according to claim 1, whereby the conducting section comprises multiple kinks with an angle, whereby the angle between the kinks is equal and at least two angles between kinks differ in sign.

6. The electrical bushing according to claim 1, whereby the conducting element provides at least one electrode surface of a capacitor or of an electromechanical resonator that is provided by the filter structure.

7. The electrical bushing according to claim 6, whereby at least one section of the electrically insulating base body provides a dielectric layer of the capacitor or a piezoelectric body of the electromechanical resonator.

8. The electrical bushing according to claim 1, whereby the filter structure comprises an additional frequency-selective component and the conducting element provides at least one contact surface to which the additional frequency-selective component is connected, whereby the additional frequency-selective component is provided as capacitor, as additional inductor, as electromechanical resonator or as integrated filter circuit.

9. The electrical bushing according to claim 8, whereby the additional frequency-selective component comprises at least one connector that is physically connected to the at least one contact surface through a solder connection or through a press-fit.

10. The electrical bushing according to claim 1, whereby the filter structure provides the inductor formed by the conducting element as serial filter in the electrically conductive connection, or whereby the filter structure can further comprise at least one capacitor element in the form of a capacitor, whose at least one electrode surface is provided by the conducting element, or the filter structure can comprise a capacitor in the form of an additional frequency-selective component, and said capacitor element and the inductor provided by the conducting element together form an anti-resonant circuit that is arranged in-series in the electrically conductive connection.

11. The electrical bushing according to claim 1, comprising multiple conducting elements which each provide at least one conducting section of the at least one inductor of the filter structure.

12. The electrical bushing according to claim 1, whereby the filter structure and/or the at least one conducting section of the inductor provided by the conducting element is/are arranged at the surface of a bushing that is provided to border on the internal space or on the external space, or whereby the filter structure and/or the at least one conducting section of the inductor provided by the conducting element is/are arranged within the bushing.

13. An implantable medical device comprising:

a housing; and

an electrical bushing used in the housing and comprising at least one electrically insulating base body and at least one electrical conducting element;

whereby the at least one electrical conducting element is set up to establish, through the base body, at least one electrically conductive connection between an internal space of the housing and an external space;

whereby the at least one electrical conducting element is hermetically sealed with respect to the base body; and

whereby the at least one electrical conducting element comprises at least one cermet to seal the at least one electrical conducting element directly to the base body;

characterized in that the electrical bushing comprises an electrical filter structure, whereby the at least one electrical conducting element provides at least one conducting section of an inductor of the filter structure.

14. The implantable medical device according to claim 13, whereby the implantable medical device comprises a cardiac pacemaker or defibrillator.

15. Use of at least one cermet-containing conducting element in an electrical bushing for an implantable medical device for provision of at least one conducting section of an inductor of an electrical filter structure of the bushing.