Magnetic structure for feedthrough filter assembly

• US 20030191505A1
• Filed: 04/09/2002
• Published: 10/09/2003
• Est. Priority Date: 04/09/2002
• Status: Abandoned Application

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Novotny, Allen, Lyden, Michael J., Gryzwa, Mark, Sprain, Jason, Chizek, David
• Application Number:
  US10/119,543
• Publication Number:
  US 20030191505A1
• Time in Patent Office: Days
• US Class Current: 607/37
• CPC Class Codes: A61N 1/3754 Feedthroughs

Abstract

A feedthrough assembly for use in an implantable medical device that performs filtering of electromagnetic interference and can be easily manufactured. A magnetic structure is adapted to fit over a plurality of terminal pins of the feedthrough assembly within the device housing to provide inductive isolation from electromagnetic interference.

Claims

1. A feedthrough filter assembly, comprising:

a plurality of conductive terminal pins;

a conductive ferrule through which the terminal pins pass in non-conductive and sealing relation, the ferrule being adapted for fitting within an opening of a conductive housing; and

,

a magnetic structure for fitting over the terminal pins within the conductive housing to thereby form an inductive filter for signals carried by the terminal pins.

2. The assembly of claim 1 wherein the magnetic structure is made from a ferrimagnetic material.

3. The assembly of claim 2 wherein the ferromagnetic material is ferrite.

4. The assembly of claim 1 wherein the magnetic structure is a block having openings therein through which the terminal pins pass.

5. The assembly of claim 1 wherein the magnetic structure has a non-conductive surface that insulates the terminal pins from one another.

6. The assembly of claim 1 wherein the magnetic structure is made from ferrimagnetic material that has a non-conductive oxide surface.

7. The assembly of claim 1 further comprising a non-conductive bushing within the conductive ferrule through which the terminal pins pass.

8. The assembly of claim 1 further comprising one or more capacitors within the conductive ferrule to form a capacitive filter for signals carried by the terminal pins.

9. The assembly of claim 1 wherein the magnetic structure is formed of two or more components that are fitted over the terminal pins and fastened together.

10. A method for constructing a feedthrough filter assembly, comprising:

passing a plurality of conductive terminal pins through a conductive ferrule in non-conductive and sealing relation;

fitting the conductive ferrule within an opening of a conductive housing for an implantable medical device; and

,

fitting a magnetic structure over the terminal pins within the conductive housing to thereby form an inductive filter for signals carried by the terminal pins.

11. The method of claim 10 wherein the magnetic structure is made from a ferrimagnetic material.

12. The method of claim 11 wherein the ferromagnetic material is ferrite.

13. The method of claim 10 wherein the magnetic structure is a block having openings therein through which the terminal pins pass.

14. The method of claim 10 wherein the magnetic structure has a non-conductive surface that insulates the terminal pins from one another.

15. The method of claim 10 wherein the magnetic structure is made from ferrimagnetic material that has a non-conductive oxide surface.

16. The method of claim 10 further comprising integrating a non-conductive bushing within the conductive ferrule through which the terminal pins pass.

17. The method of claim 10 further comprising integrating one or more capacitors within the conductive ferrule to form a capacitive filter for signals carried by the terminal pins.

18. The method of claim 10 further comprising fitting two half-portions of the magnetic structure over the terminal pins and fastening them together.