Filtering capacitor feedthrough assembly

• US 8,478,409 B2
• Filed: 03/25/2011
• Issued: 07/02/2013
• Est. Priority Date: 03/21/2007
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Iyer, Rajesh V., Millis, Richard P., Marinkov, Michael G., Litow, Micah A.
• Primary Examiner(s): DIETRICH, JOSEPH M
• Application Number:
  US13/072,204
• Publication Number:
  US 20110170230A1
• Time in Patent Office: 830 Days
• Field of Search: 607 36- 38, 439/909, 174/650, 174/659, 174/664, 174/50, 174/52, 333/182, 361/307
• US Class Current: 607/36
• CPC Class Codes: A61N 1/3754 Feedthroughs
• CPC Class Codes: H01G 4/35 Feed-through capacitors or anti-noise capacitors
• CPC Class Codes: Y10S 439/909 Medical use or attached to human body

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 defined by an inner capacitor surface. 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. An electrically conductive split ring sleeve is disposed within the aperture and between the terminal pin and the capacitor. The split ring sleeve includes a first end, a second end, a sleeve length therebetween. A longitudinal slit through the sleeve extends from the first end to the second end. The electrically conductive split ring sleeve mechanically securing and electrically coupling 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 being mechanically secured and electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device;

a terminal pin electrically isolated from the conductive feedthrough ferrule or housing of the implantable active medical device, the terminal pin extending into the aperture, the terminal pin mechanically secured and electrically coupled to the capacitor with an electrically conductive tapered wedge element.

2. The filtering capacitor feedthrough assembly according to claim 1, wherein the electrically conductive tapered wedge element mechanically secures and electrically couples the terminal pin to an inner capacitor surface defining the aperture of the capacitor.

3. The filtering capacitor feedthrough assembly according to claim 1, wherein the electrically conductive tapered wedge element includes a first end, a second end, a sleeve length therebetween, and a longitudinal slit through the sleeve extends from the first end to the second end.

4. The filtering capacitor feedthrough assembly according to claim 3, wherein the electrically conductive tapered wedge element end has a circumference that is greater than the second end.

5. The filtering capacitor feedthrough assembly according to claim 3, wherein the first end has a first sleeve thickness value that is greater than the second end second sleeve thickness value.

6. The filtering capacitor feedthrough assembly according to claim 1, wherein the electrically conductive tapered wedge element is fixed to the terminal pin.

7. The filtering capacitor feedthrough assembly according to claim 1, wherein the electrically conductive tapered wedge element comprises two or more metallic layers.

8. The filtering capacitor feedthrough assembly according to claim 2, wherein the electrically conductive tapered wedge element is defined by an outer sleeve surface, an opposing inner sleeve surface, and a sleeve thickness therebetween, and a majority the outer sleeve surface is in contact with the inner capacitor surface and a majority of the inner sleeve surface is in contact with the terminal pin.

9. The filtering capacitor feedthrough assembly according to claim 2, wherein the electrically conductive tapered wedge element is a tapered hollow cylinder.

10. The filtering capacitor feedthrough assembly according to claim 2, wherein the electrically conductive tapered wedge element mechanically secures and electrically couples the terminal pin to the capacitor by frictional engagement or interference fit of the electrically conductive tapered wedge element between the inner capacitor surface and the terminal pin.

11. 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 defined by an inner capacitor surface, 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 split ring sleeve disposed within the aperture and between the terminal pin and the capacitor, the split ring sleeve includes a first end, a second end, a sleeve length therebetween, and a longitudinal slit through the sleeve extending from the first end to the second end, the electrically conductive split ring sleeve mechanically securing and electrically coupling the terminal pin to the capacitor by frictional engagement or interference fit of the electrically conductive split ring sleeve between the inner capacitor surface and the terminal pin.

12. The implantable active medical device according to claim 11, wherein the split ring sleeve is a tapered hollow cylinder.

13. The implantable active medical device according to claim 11, wherein the split ring sleeve is defined by an outer sleeve surface, an opposing inner sleeve surface, and a sleeve thickness therebetween, and a majority the outer sleeve surface is in contact with the inner capacitor surface and a majority of the inner sleeve surface is in contact with the terminal pin.

14. The implantable active medical device according to claim 11, wherein the split ring sleeve first end has a circumference that is greater than the second end.

15. The implantable active medical device according to claim 11, wherein the first end has a first sleeve thickness value that is greater than the second end second sleeve thickness value.

16. The implantable active medical device according to claim 11, wherein the split ring sleeve is fixed to the terminal pin.

17. The implantable active medical device according to claim 11, wherein the split ring sleeve comprises two or more metallic layers.