Feedthrough filter capacitor assembly with internally grounded hermetic insulator

• US 20070035910A1
• Filed: 03/21/2006
• Published: 02/15/2007
• Est. Priority Date: 08/15/2005
• Status: Active Grant

• Current Assignee: Greatbatch Limited (Greatbatch Incorporated)
• Original Assignee: Greatbatch-Sierra, Inc.
• Inventors: Stevenson, Robert
• Granted Patent: US 7,199,995 B2
• Time in Patent Office: Days
• US Class Current: 361/302
• CPC Class Codes: A61N 1/3754 Feedthroughs
• CPC Class Codes: H01G 4/35 Feed-through capacitors or anti-noise capacitors

Abstract

A feedthrough filter capacitor assembly includes a conductive terminal pin which extends through a first passageway of a capacitor in conductive relation with a first set of electrode plates, and through a conductive ground plane and an insulator in non-conductive relation. The insulator includes ground plates conductively coupled to the ferrule. A second set of electrode plates of the capacitor are conductively coupled to the insulator ground plates, such as by a ground pin extending through the capacitor in relation with the second set of electrode plates, and at least partially extending through a second passageway of the insulator in conductive relation with the ground plates. In this manner, the exterior electrical/mechanical connection between the capacitor and ground plane or other ground member is eliminated.

Claims

1. A feedthrough filter capacitor assembly, comprising:

a conductive terminal pin;

a feedthrough filter capacitor having first and second sets of electrode plates, a first passageway through which the terminal pin extends in conductive relation with the first set of electrode plates;

a conductive ferrule through which the terminal pin extends in non-conductive relation;

an insulator having a first passageway through which the terminal pin extends in non-conductive relation, and a ground plate conductively coupled to the ferrule; and

means for conductively coupling the capacitor second set of electrode plates and the insulator ground plate.

2. The assembly of claim 1, wherein the insulator ground plate comprises a set of ground plates.

3. The assembly of claim 2, wherein the coupling means includes a conductive material pin at least partially extending through a second passageway of the capacitor in conductive relation with the second set of electrode plates, and at least partially extending through a second passageway of the insulator in conductive relation with the set of ground plates.

4. The assembly of claim 3, wherein the conductive material comprises a ground pin, a ground wire, a solder material, a conductive thermal setting material, a weld, a braze, a conductive glass, or a conductive spring coil.

5. The assembly of claim 1, wherein the ferrule is conductively coupled to a housing for an active implantable medical device.

6. The assembly of claim 5, wherein the active implantable medical device is a cardiac pacemaker, an implantable defibrillator, a congestive heart failure device, a hearing implant, a cochlear implant, a neurostimulator, a drug pump, a ventricular assist device, an insulin pump, a spinal cord stimulator, an implantable sensing system, a deep brain stimulator, an artificial heart, an incontinence device, a vagus nerve stimulator, a bone growth stimulator, a gastric pacemaker, or a prosthetic device.

7. The assembly of claim 1, including an inductor through which the terminal pin extends in non-conductive relation.

8. The assembly of claim 7, wherein the inductor comprises a ferrite inductor slab.

9. The assembly of claim 7, wherein the inductor is disposed adjacent to the capacitor.

10. The assembly of claim 9, wherein the inductor is disposed between the capacitor and the insulator.

11. The assembly of claim 1, wherein an outer peripheral surface of the capacitor is non-conductive.

12. The assembly of claim 1, wherein the insulator comprises an alumina insulator.

13. The assembly of claim 1, wherein the insulator ground plate extends to a conductive outer peripheral surface of the insulator.

14. The assembly of claim 13, wherein the conductive outer peripheral surface of the insulator is conductively coupled to the ferrule.

15. The assembly of claim 1, wherein the capacitor and insulator are disposed adjacent to each other and separated by a non-conductive material.

16. A feedthrough filter capacitor assembly, comprising:

a conductive terminal pin;

a feedthrough filter capacitor having first and second sets of electrode plates, a first passageway through which the terminal pin extends in conductive relation with the first set of electrode plates;

a conductive ferrule through which the terminal pin extends in non-conductive relation;

an insulator having a first passageway through which the terminal pin extends in non-conductive relation, and a ground plate conductively coupled to the ferrule; and

a conductive material at least partially extending through a second passageway of the capacitor in conductive relation with the second set of electrode plates and at least partially extending through a second passageway of the insulator in conductive relation with the ground plate, for conductively coupling the capacitor second set of electrode plates and the ground plate.

17. The assembly of claim 16, wherein the conductive material comprises a ground pin, a ground wire, a solder material, a conductive thermal setting material, a weld, a braze, a conductive glass, or a conductive spring coil.

18. The assembly of claim 16, wherein the ferrule is conductively coupled to a housing for an active implantable medical device.

19. The assembly of claim 18, wherein the active implantable medical device is a cardiac pacemaker, an implantable defibrillator, a congestive heart failure device, a hearing implant, a cochlear implant, a neurostimulator, a drug pump, a ventricular assist device, an insulin pump, a spinal cord stimulator, an implantable sensing system, a deep brain stimulator, an artificial heart, an incontinence device, a vagus nerve stimulator, a bone growth stimulator, a gastric pacemaker, or a prosthetic device.

20. The assembly of claim 16, including an inductor through which the terminal pin extends in non-conductive relation.

21. The assembly of claim 20, wherein the inductor comprises a ferrite inductor slab.

22. The assembly of claim 20, wherein the inductor is disposed adjacent to the capacitor.

23. The assembly of claim 22, wherein the inductor is disposed between the capacitor and the insulator.

24. The assembly of claim 16, wherein an outer peripheral surface of the capacitor is non-conductive.

25. The assembly of claim 16, wherein the insulator comprises an alumina insulator.

26. The assembly of claim 16, wherein the insulator ground plate extends to a conductive outer peripheral surface of the insulator which is conductively coupled to the ferrule.

27. The assembly of claim 16, wherein the capacitor and insulator are disposed adjacent to each other and separated by a non-conductive material.

28. The assembly of claim 16, wherein the insulator ground plate comprises a set of ground plates.

29. A feedthrough filter capacitor assembly, comprising:

a conductive terminal pin;

a feedthrough filter capacitor having first and second sets of electrode plates, and a first passageway through which the terminal pin extends in conductive relation with the first set of electrode plates;

a conductive ferrule conductively coupled to a housing for an active implantable medical device and through which the terminal pin extends in non-conductive relation;

an insulator having a first passageway through which the terminal pin extends in non-conductive relation, and a ground plate extending to a conductive outer peripheral surface of the insulator that is conductively coupled to the ferrule; and

a conductive material at least partially extending through a second passageway of the capacitor in conductive relation with the second set of electrode plates, and at least partially extending through a second passageway of the insulator in conductive relation with the ground plate for conductively coupling the second set of electrode plates and the ferrule.

30. The assembly of claim 29, wherein the conductive material comprises a ground pin, a ground wire, a solder material, a conductive thermal setting material, a weld, a braze, a conductive glass, or a conductive spring coil.

31. The assembly of claim 29, wherein the active implantable medical device is a cardiac pacemaker, an implantable defibrillator, a congestive heart failure device, a hearing implant, a neurostimulator, a drug pump, a ventricular assist device, an insulin pump, a spinal cord stimulator, an implantable sensing system, a deep brain stimulator, an artificial heart, an incontinence device, a vagus nerve stimulator, a bone growth stimulator, a gastric pacemaker, or a prosthetic device.

32. The assembly of claim 29, including an inductor through which the terminal pin extends in non-conductive relation.

33. The assembly of claim 32, wherein the inductor comprises a ferrite inductor slab.

34. The assembly of claim 32, wherein the inductor is disposed adjacent to the capacitor.

35. The assembly of claim 34, wherein the inductor is disposed between the capacitor and the insulator.

36. The assembly of claim 29, wherein an outer peripheral surface of the capacitor is non-conductive.

37. The assembly of claim 29, wherein the insulator comprises an alumina insulator.

38. The assembly of claim 29, wherein the capacitor and insulator are disposed adjacent to each other and separated by a non-conductive material.