ELECTRICAL BUSHING WITH GRADIENT CERMET

• US 20110186349A1
• Filed: 02/01/2011
• Published: 08/04/2011
• Est. Priority Date: 02/02/2010
• Status: Active Grant

• Current Assignee: Heraeus Medevio GmbH & Company KG
• Original Assignee: WC Heraeus GmbH (Heraeus Holding GMBH)
• Inventors: Pavlovic, Goran, Guebler, Nicole, Troetzschel, Jens, Manhardt, Harald
• Granted Patent: US 8,528,201 B2
• Time in Patent Office: Days
• US Class Current: 174/650
• CPC Class Codes: A61N 1/3754 Feedthroughs
• CPC Class Codes: B28B 1/00 Producing shaped prefabricated articles from the material using presses B28B3/00; shaping on moving conveyors B28B5/00; producing tubular articles B28B21/00 ; producing articles with embedded elements B28B23/00
• CPC Class Codes: B28B 11/24 for curing, setting or hardening processes for influencing or modifying the setting or hardening ability of mortars, concrete or artificial stone compositions, in general C04B40/00
• CPC Class Codes: B29C 71/02 Thermal after-treatment B29C71/0063 and B29C71/0072 take precedence
• CPC Class Codes: H02G 1/00 Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
• CPC Class Codes: H02G 3/18 providing line outlets
• CPC Class Codes: H02G 3/22 Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing
• CPC Class Codes: Y10T 29/49158 with molding of insulated base
• CPC Class Codes: Y10T 29/49163 with sintering of base

Abstract

One aspect relates to a method for producing an electrical bushing for an implantable device, an electrical bushing, and an implantable device. The method according to one embodiment includes forming a base body from a ceramic slurry and introducing a bushing conductor made of a metal powder, metal slurry, cermet powder and/or cermet slurry into the base body. The metal fraction in the bushing conductor is provided to decrease towards the base body. It includes sintering the green blank that includes the base body and the bushing conductor.

Claims

1. A method for producing an electrical bushing for an implantable device, wherein a green blank is produced from an electrically insulating base body and at least one electrically conductive bushing conductor that extends through the base body, the method comprising:

forming the base body from a ceramic slurry;

introducing a bushing conductor made of a metal powder, metal slurry, cermet powder and/or cermet slurry into the base body, whereby the metal fraction in the bushing conductor is provided to decrease towards the base body; and

sintering the green blank that comprises the base body and the bushing conductor.

2. The method according to claim 1, characterized in that, for introduction of the at least one bushing conductor into the base body, a bushing opening is generated in the base body and one or more organic films, which have a low combustion point and separate various volumes from each other, are introduced into the bushing opening, whereby metal powder, cermet powder, metal slurry and/or cermet slurry with different metal fractions are subsequently filled into the various volumes.

3. The method according to claim 2, characterized in that the bushing opening is generated in the base body and one or more organic films in a concentric arrangement.

4. The method according to claim 1, characterized in that, for introduction of the at least one bushing conductor into the base body, a bushing opening is generated in the base body, a bushing conductor green blank is formed and inserted into the bushing opening of the base body.

5. The method according to claim 4, characterized in that, prior to inserting it in the bushing opening, the bushing conductor green blank is enveloped in one or more transitional layers made of a cermet slurry whose metal fraction or metal fractions decrease(s) progressively from inside towards outside.

6. The method according to claim 1, characterized in that, for introduction of the at least one bushing conductor into the base body, the base body and/or a cermet slurry-filled volume of the bushing opening is punctured with an injection needle and the injection needle is retracted while injecting a metal powder, a metal slurry, a cermet powder and/or a cermet slurry.

7. The method according to claim 6, characterized in that the injection proceeds under pressure and the injected metal and/or cermet powder and/or the injected metal and/or cermet slurry penetrates into the surrounding material under pressure.

8. The method according to claim 6, characterized in that the injection needle comprises two or more injection channels in a concentric arrangement through which two or more materials with different metal fractions are co-extruded or co-injected into the base body or into the bushing conductor.

9. The method according to claim 1, characterized in that, after completing the sintering, at least one surface of the electrical bushing is polished and contacted with a metallic pin or wire in at least one place of the surface at which the at least one bushing conductor is arranged.

10. The method according to claim 1, characterized in that, in addition, prior to the sintering, a wreath-shaped fringe body is formed from a cermet slurry and has a receiving opening for the base body into which the base body is inserted in order to form the green blank.

11. A method for producing an implantable device comprising:

forming an electrically insulating base body from a ceramic slurry;

introducing at least one electrically conductive bushing conductor made of a metal powder, metal slurry, cermet powder and/or cermet slurry into the base body, whereby the metal fraction in the bushing conductor is provided to decrease towards the base body; and

sintering a green blank that comprises the base body and the bushing conductor.

12. An electrical bushing for an implantable device comprising:

an electrically insulating base body; and

at least one electrically conductive bushing conductor that extends through the base body;

wherein the base body is produced from a sintered ceramic material, characterized in that the at least one bushing conductor consists of a metal and/or cermet material that has been jointly sintered with the base body and has a metal fraction that decreases from the interior of the bushing conductor towards the outside.

13. The electrical bushing according to claim 12, characterized in that the base body is connected circumferentially to a wreath-shaped fringe body made of a cermet material through a firmly bonded sintered connection, whereby the fringe body comprises a receiving opening, in which the base body is arranged.

14. The electrical bushing according to claim 12, characterized in that it is hermetically sealed for gases and liquids.

15. The electrical bushing of claim 12, which is produced by:

forming the base body from a ceramic slurry;

introducing the bushing conductor made of a metal powder, metal slurry, cermet powder and/or cermet slurry into the base body, whereby the metal fraction in the bushing conductor is provided to decrease towards the base body; and

sintering the green blank that comprises the base body and the bushing conductor.

16. An implantable device comprising:

an electrical bushing having an electrically insulating base body; and

at least one electrically conductive bushing conductor that extends through the base body;

wherein the base body is produced from a sintered ceramic material; and

wherein the electrical bushing characterized in that the at least one bushing conductor consists of a metal and/or cermet material that has been jointly sintered with the base body and has a metal fraction that decreases from the interior of the bushing conductor towards the outside.