Filtering capacitor feedthrough assembly

• US 7,706,124 B2
• Filed: 01/28/2009
• Issued: 04/27/2010
• Est. Priority Date: 02/16/2007
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Iyer, Rajesh, Zhao, Jennifer J., Knowles, Shawn D., Goldman, Simon E., Litow, Micah A., Belete, Dawit Y.
• Primary Examiner(s): Thomas; Eric
• Assistant Examiner(s): Sinclair; David M
• Application Number:
  US12/360,882
• Publication Number:
  US 20090128987A1
• Time in Patent Office: 454 Days
• Field of Search: 361/307, 361/302, 361/206.1, 607/2, 607/7
• US Class Current: 361/307
• CPC Class Codes: A61N 1/3754 Feedthroughs
• CPC Class Codes: H01G 2/10 Housing; Encapsulation
• CPC Class Codes: H01G 4/35 Feed-through capacitors or anti-noise capacitors
• CPC Class Codes: Y10T 29/435 Solid dielectric type
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

A filtering capacitor feedthrough assembly for an implantable active medical device is disclosed. The filtering capacitor feedthrough assembly includes a capacitor having an aperture, the capacitor is electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device. A terminal pin extends into the aperture and an electrically conductive continuous coil is disposed within the aperture and between the terminal pin and the capacitor. The electrically conductive continuous coil mechanically secures and electrically couples the terminal pin to the capacitor.

Claims

1. A filtering capacitor feedthrough assembly for an implantable active medical device comprising:

a capacitor having an aperture, the capacitor electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device;

a terminal pin extending into the aperture; and

an electrically conductive continuous coil disposed within the aperture between the terminal pin and the capacitor, the continuous coil being fixed to the terminal pin and the capacitor with solder, weld, braze or conductive adhesive, the continuous coil comprising an inner diameter defined by a plurality of coils, each coil having a coil diameter different than the inner diameter, with the terminal pin extending through the inner diameter of the continuous coil so that the plurality of coils circumferentially surround the terminal pin, the electrically conductive continuous coil mechanically securing and electrically coupling the terminal pin to the capacitor.

2. A filtering capacitor feedthrough assembly according to claim 1, wherein the continuous coil is compressed between the terminal pin and the capacitor.

3. A filtering capacitor feedthrough assembly according to claim 1, wherein the plurality of coils are canted.

4. A filtering capacitor feedthrough assembly according to claim 1, comprising two or more continuous coils disposed within the aperture and between the terminal pin and the capacitor, and mechanically securing and electrically coupling the terminal pin to the capacitor.

5. A filtering capacitor feedthrough assembly according to claim 1, further comprising a conductive adhesive, solder, or braze disposed within the aperture.

6. A filtering capacitor feedthrough assembly according to claim 1, wherein the aperture defines a ledge and the continuous coil is disposed on the ledge.

7. A filtering capacitor feedthrough assembly according to claim 1, further comprising a second electrically conductive continuous coil disposed between the capacitor and the electrically conductive feedthrough ferrule or housing of the implantable active medical device, the second electrically conductive continuous coil mechanically securing and electrically coupling the capacitor and the electrically conductive feedthrough ferrule or housing of the implantable active medical device.

8. An implantable active medical device comprising:

a hermetically sealed housing;

electronics disposed within the sealed housing;

a lead connector attached to the hermetically sealed housing; and

a filtering capacitor feedthrough assembly electrically connecting the electronics and the lead connector, the filtering capacitor feedthrough assembly comprising;

a capacitor having an aperture, the capacitor electrically grounded to the hermetically sealed housing;

a terminal pin extending into the aperture, the terminal pin electrically connecting the electronics and the lead connector; and

an electrically conductive continuous coil disposed within the aperture between the terminal pin and the capacitor, the continuous coil being fixed to the terminal pin and the capacitor with solder, weld, braze or conductive adhesive, the continuous coil comprising an inner diameter defined by a plurality of coils, each coil having a coil diameter different than the inner diameter, with the terminal pin extending through the inner diameter of the continuous coil so that the plurality of coils circumferentially surround the terminal pin, the electrically conductive continuous coil mechanically securing and electrically coupling the terminal pin to the capacitor.

9. An implantable active medical device according to claim 8, wherein the continuous coil is compressed between the terminal pin and the capacitor.

10. An implantable active medical device according to claim 8, wherein the plurality of coils are canted.

11. An implantable active medical device according to claim 8, comprising two or more continuous coils disposed within the aperture and between the terminal pin and the capacitor, and mechanically securing and electrically coupling the terminal pin to the capacitor.

12. An implantable active medical device according to claim 8, further comprising a conductive adhesive, solder, or braze disposed within the aperture.

13. An implantable active medical device according to claim 8, wherein the aperture defines a ledge and the electrically conductive continuous coil is disposed on the ledge.

14. An implantable active medical device according to claim 8, further comprising a second electrically conductive continuous coil disposed between the capacitor and the hermetically sealed housing, the second electrically conductive continuous coil mechanically securing and electrically coupling the capacitor and the hermetically sealed housing.