ELECTRICAL BUSHING FOR AN IMPLANTABLE MEDICAL DEVICE

• US 20110034966A1
• Filed: 08/04/2010
• Published: 02/10/2011
• Est. Priority Date: 08/04/2009
• Status: Active Grant

• Current Assignee: Heraeus Medevio GmbH & Company KG
• Original Assignee: WC Heraeus GmbH (Heraeus Holding GMBH)
• Inventors: Specht, Heiko, Troetzschel, Jens
• Granted Patent: US 8,929,987 B2
• Time in Patent Office: Days
• US Class Current: 607/37
• CPC Class Codes: A61N 1/3754 Feedthroughs

Abstract

One aspect relates to an electrical bushing for an implantable medical device, having an annulus-like holding element for holding the electrical bushing in the implantable medical device, whereby the holding element includes a through-opening, at least one elongated conducting wire extends through the through-opening, and an insulation element for forming a hermetic seal between the holding element and the conducting wire is arranged in the through-opening. One aspect provides for a cermet-containing bearing element to be arranged between the insulation element and the conducting wire.

Claims

1. An electrical bushing for an implantable medical device, having an annulus-like holding element for holding the electrical bushing in the implantable medical device, whereby

the holding element comprises a through-opening;

at least one elongated conducting wire extends through the through-opening;

an insulation element for forming a hermetic seal between the holding element and the conducting wire is arranged in the through-opening;

characterized in that a cermet-containing bearing element is arranged between the insulation element and the conducting wire.

2. The electrical bushing according to claim 1, characterized in that the bearing element separates the conducting wire from the insulation element in a cuff-like manner.

3. The electrical bushing according to claim 1, characterized in that a cermet-containing fringe is arranged between the insulation element and the holding element.

4. The electrical bushing according to claim 1, characterized in that the at least one elongated conducting wire comprises a metal from a group comprising Ti, Ta, Pt and an alloy of at least one of said metals.

5. The electrical bushing according to claim 1, characterized in that the insulation element is made from an insulating composition of materials, and in that the insulating composition of materials is at least one from a group comprising aluminum oxide, magnesium oxide, zirconium oxide, aluminum-titanate, and piezo-ceramics.

6. The electrical bushing according to claim 1, characterized in that the holding element comprises at least one flange, and in that the flange is conductive like a metal.

7. The electrical bushing according to claim 1, characterized in that the holding element and/or the at least one flange comprise a metal from a group comprising Ti, Ta, Pt and an alloy of at least one of said metals.

8. Use of a cermet-containing bearing element between an insulation element and a conducting wire in an electrical bushing for an implantable medical device.

9. An implantable medical device comprising:

an electrical bushing having an annulus-like holding element for holding the electrical bushing in the implantable medical device;

wherein the holding element comprises a through-opening;

at least one elongated conducting wire extending through the through-opening;

an insulation element forming a hermetic seal between the holding element and the conducting wire arranged in the through-opening; and

a cermet-containing bearing element arranged between the insulation element and the conducting wire.

10. The implantable medical device of claim 9, wherein the medical device is one of a cardiac pacemaker and a defibrillator.

11. A method for producing an electrical bushing for an implantable medical device, the method comprising:

generating an insulation element green compact for an insulation element from an insulating composition of materials;

forming at least one cermet-containing bearing element green compact for a bearing element;

introducing the at least one bearing element green compact into the insulation element green compact;

firing the insulation element green compact and the at least one bearing element green compact to obtain an insulation element with at least one bearing element;

inserting an elongated conducting wire into the at least one bearing element; and

surrounding the insulation element, at least in part, with a holding element.

12. The method according to claim 11, characterized in that generating an insulation element green compact comprises partial sintering of the insulation element green compact.

13. The method according to claim 11, characterized in that forming at least one cermet-containing bearing element green compact comprises partial sintering of the bearing element green compact.

14. The method according claim 11, characterized in that prior to firing the insulation element green compact and the at least one bearing element green compact, the method comprises:

producing at least one cermet-containing fringe green compact for a fringe;

introducing the at least one bearing element green compact into the insulation element green compact; and

introducing the insulation element green compact into the fringe green compact;

whereby firing the insulation element green compact and the at least one bearing element green compact comprises firing the insulation element green compact and the at least one bearing element green compact and the fringe green compact to obtain an insulation element with at least one bearing element and a fringe.

15. The method according to claim 14, characterized in that the production of the at least one cermet-containing fringe green compact comprises partial sintering.