Methods of forming a filtering capacitor feedthrough assembly

• US 7,916,448 B2
• Filed: 04/13/2010
• Issued: 03/29/2011
• Est. Priority Date: 02/16/2007
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Zhao, Jennifer J., Knowles, Shawn D., Goldman, Simon E., Belete, Dawit Y., Iyer, Rajesh, Litow, Micah A.
• Primary Examiner(s): Thomas; Eric
• Assistant Examiner(s): Sinclair; David M
• Application Number:
  US12/759,142
• Publication Number:
  US 20100192355A1
• Time in Patent Office: 350 Days
• Field of Search: 361/307, 361/302, 361/306.1, 607/2, 607/7, 29/254.2
• 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 method of forming a filtering capacitor feedthrough assembly for an implantable active medical device includes inserting a terminal pin into an aperture of a capacitor, the capacitor configured to be electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device, then disposing an electrically conductive continuous coil within the aperture between the terminal pin and the capacitor and then fixing the continuous coil to the terminal pin or the capacitor. The continuous coil includes an inner diameter defined by a plurality of coils, 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 secures and electrically couples the terminal pin to the capacitor.

Claims

1. A method of forming a filtering capacitor feedthrough assembly for an implantable active medical device comprising:

inserting a terminal pin into an aperture of a capacitor, the capacitor configured to be electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device;

disposing an electrically conductive continuous coil within the aperture between the terminal pin and the capacitor; and

fixing the continuous coil to the terminal pin and the capacitor, the continuous coil comprising an inner diameter defined by a plurality of coils, 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 method according to claim 1, wherein the fixing step comprises soldering the continuous coil to the terminal pin or capacitor.

3. A method according to claim 1, wherein fixing step comprises welding the continuous coil to the terminal pin or capacitor.

4. A method according to claim 1, wherein fixing step comprises adhering the continuous coil to the terminal pin or capacitor.

5. A method according to claim 1, wherein the disposing step comprises compressing the continuous coil between the terminal pin and the capacitor.

6. A method according to claim 1, wherein the disposing step comprise disposing two or more continuous coils within the aperture and between the terminal pin and the capacitor, the two or more continuous coils mechanically securing and electrically coupling the terminal pin to the capacitor.

7. A method according to claim 1, wherein the fixing step further comprises disposing a conductive adhesive, solder, or braze disposed within the aperture.

8. A method according to claim 1, wherein the aperture defines a ledge and the continuous coil is disposed on the ledge.

9. A method according to claim 1, further comprising disposing a second electrically conductive continuous coil 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.

10. A method of forming a filtering capacitor feedthrough assembly for an implantable active medical device comprising:

inserting a terminal pin into an aperture of a capacitor, the capacitor configured to be electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device;

disposing an electrically conductive continuous coil within the aperture between the terminal pin and the capacitor; and

fixing the continuous coil to the terminal pin, the continuous coil comprising an inner diameter defined by a plurality of coils, 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.

11. A method according to claim 10, wherein the fixing step comprises soldering the continuous coil to the terminal pin.

12. A method according to claim 10, wherein fixing step comprises welding the continuous coil to the terminal pin.

13. A method according to claim 10, wherein fixing step comprises adhering the continuous coil to the terminal pin.

14. A method according to claim 10, wherein the disposing step comprises compressing the continuous coil between the terminal pin and the capacitor.

15. A method according to claim 10, wherein the disposing step comprise disposing two or more continuous coils within the aperture and between the terminal pin and the capacitor, the two or more continuous coils mechanically securing and electrically coupling the terminal pin to the capacitor.

16. A method according to claim 10, wherein the fixing step further comprises disposing a conductive adhesive, solder, or braze disposed within the aperture.

17. A method of forming an active medical device comprising:

forming a filtering capacitor feedthrough assembly by;

inserting a terminal pin into an aperture of a capacitor, the capacitor configured to be electrically grounded to an electrically conductive feedthrough ferrule or housing of the implantable active medical device;

disposing an electrically conductive continuous coil within the aperture between the terminal pin and the capacitor; and

fixing the continuous coil to the terminal pin, the continuous coil comprising an inner diameter defined by a plurality of coils, 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;

attaching a lead connector and active medical device electronics to the filtering capacitor feedthrough assembly; and

hermetically sealing the active medical device electronics within the housing of the implantable active medical device.

18. A method according to claim 17, wherein the fixing step comprises soldering, welding or adhering the continuous coil to the terminal pin or capacitor.

19. A method according to claim 17, wherein the fixing step further comprises disposing a conductive adhesive, solder, or braze disposed within the aperture.