Method of producing an electrical bushing with gradient cermet

• US 8,528,201 B2
• Filed: 02/01/2011
• Issued: 09/10/2013
• 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: Troetzschel, Jens, Pavlovic, Goran, Manhardt, Harald, Guebler, Nicole
• Primary Examiner(s): Nguyen, Donghai D
• Application Number:
  US13/018,882
• Publication Number:
  US 20110186349A1
• Time in Patent Office: 952 Days
• Field of Search: 29/250.2, 298/30, 298/46, 298/48, 298/51, 298/52, 156/89.11, 156/89.16, 174/257, 174/264, 607/37, 607/116
• US Class Current: 29/851
• 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 comprising cermet powder or cermet slurry and comprising a metal fraction into the base body, whereby the metal fraction in the bushing conductor is provided to decrease towards the base body;

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

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 cermet powder or cermet slurry with different metal fractions are subsequently filled into the various volumes.

2. The method according to claim 1, characterized in that the bushing opening is generated in the base body and one or more organic films in a concentric arrangement.

3. 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.

4. 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.