Compact connector assembly for implantable medical device

• US 8,593,816 B2
• Filed: 09/21/2011
• Issued: 11/26/2013
• Est. Priority Date: 09/21/2011
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Iyer, Rajesh V., Marinkov, Michael G., Nygren, Lea A., Clayton, Jeffrey J., Strom, James, Meyer, Thomas E., Deininger, Steven T., Kuechenmeister, Wayne R.
• Primary Examiner(s): BARRERA, RAMON M
• Application Number:
  US13/239,037
• Publication Number:
  US 20130070423A1
• Time in Patent Office: 797 Days
• Field of Search: 361/306.2, 361/307, 361/728, 607/36, 607/37, 607/38, 439/909
• US Class Current: 361/728
• CPC Class Codes: A61N 1/3754 Feedthroughs
• CPC Class Codes: H01R 2107/00 Four or more poles
• CPC Class Codes: H01R 24/68 mounted on directly pluggable apparatus
• CPC Class Codes: H01R 43/20 for assembling or disassembling contact members with insulating base, case or sleeve
• CPC Class Codes: Y10T 29/49169 Assembling electrical component directly to terminal or elongated conductor

Abstract

A connector assembly for an implantable medical device includes a plurality of feedthroughs mounted in a conductive array plate, each feedthrough in the plurality of feedthroughs including a feedthrough pin electrically isolated from the conductive array plate by an insulator and an electronic module assembly including a plurality of conductive strips set in a non-conductive block. The plurality of conductive strips is in physical and electrical contact with the feedthrough pins at an angle of less than 135 degrees. The connector assembly further includes at least one circuit, the circuit including a plurality of conductors corresponding to the plurality of feedthroughs. The plurality of conductors of the circuit is in physical and electrical contact with a corresponding one of the conductive strips of the plurality of conductive strips of the electronic module assembly at an angle of less than 135 degrees.

Claims

1. A connector assembly for an implantable medical device, the connector assembly comprising:

a plurality of feedthroughs mounted in a conductive array plate, each feedthrough in the plurality of feedthroughs including a feedthrough pin electrically isolated from the conductive array plate by an insulator;

an electronic module assembly including a plurality of conductive strips set in a non-conductive block, wherein each of the plurality of conductive strips is in physical and electrical contact with a corresponding one of the feedthrough pins of the plurality of feedthroughs at a first set of electrical joints,

wherein the plurality of conductive strips is at an angle of less than 135 degrees relative to the feedthrough pins at the first set of electrical joints; and

at least one circuit, the circuit including a plurality of conductors corresponding to the plurality of feedthroughs, wherein each of the plurality of conductors of the circuit is in physical and electrical contact with a corresponding one of the conductive strips of the plurality of conductive strips of the electronic module assembly at a second set of electrical joints,

wherein the plurality of conductors is at an angle of less than 135 degrees relative to the plurality of conductive strips at the second set of electrical joints.

2. The connector assembly of claim 1,

wherein the plurality of conductive strips is at an angle of about 90 degrees relative to the feedthrough pins at the first set of electrical joints, and

wherein the plurality of conductors is at an angle of about 90 degrees relative to the plurality of conductive strips at the second set of electrical joints.

3. The connector assembly of claim 2, wherein the feedthrough pins extend in an about opposite direction as compared to the conductors of the circuit on opposing ends of the conductive strips of the electronic module assembly.

4. The connector assembly of claim 1,

wherein the plurality of conductive strips are formed from one or more metal stampings, and

wherein the non-conductive block comprises an overmold that fixes the position of the conductive strips relative to each other.

5. The connector assembly of claim 1,

wherein the plurality of conductive strips include a first set of contact pads,

wherein the feedthrough pins are soldered to the first set of contact pads to form the first set of electrical joints,

wherein the plurality of conductive strips include a second set of contact pads, wherein the conductors of the circuit are soldered to the second set of contact pads to form the second set of electrical joints.

6. The connector assembly of claim 1, wherein the feedthrough pins extend though the array plate and the electronic module assembly is positioned within a recess of the array plate.

7. The connector assembly of claim 6, further comprising a capacitor,

wherein the capacitor is positioned between electronic module assembly and the array plate,

wherein the capacitor is within the recess of the array plate,

wherein the capacitor is in electrical contact with the array plate and in electrical contact with more than one of the feedthrough pins such that the capacitor functions as a filter for the feedthrough pins in electrical contact with the capacitor,

wherein the capacitor includes a set of apertures corresponding to the feedthrough pins in electrical contact with the capacitor, and

wherein the capacitor has a parallelogram-shaped profile.

8. The connector assembly of claim 7,

wherein the capacitor comprises an upper side and a lower side,

wherein the apertures in the set of apertures extend from the upper side through the lower side,

wherein the capacitor further comprises annular members of conductive material over the upper side and around each aperture in the set of apertures, and

wherein the feedthrough pins in electrical contact with the capacitor are soldered to the apertures of the capacitor by application of solder preforms upon the annular members of conductive material.

9. The connector assembly of claim 7,

wherein each of the feedthrough pins extends in a common direction,

wherein the feedthrough pins are arranged in substantially straight and substantially parallel rows, and

wherein the feedthrough pins in each row are staggered relative to the feedthrough pins in an adjacent row.

10. The connector assembly of claim 7,

wherein the capacitor is a first capacitor,

wherein the connector assembly includes a second capacitor,

wherein the second capacitor has substantially the same shape as the first capacitor, and

wherein the first and second capacitors are each in electrical contact with more than one of the feedthrough pins.

11. The connector assembly of claim 6,

wherein each feedthrough in the plurality of feedthroughs includes an electrically conductive ferrule,

wherein the insulator of each feedthrough is located within the ferrule,

wherein the feedthrough pin of each feedthrough extends through the insulator and through the ferrule,

wherein the array plate includes a plurality of apertures within the recess, each of the plurality of apertures being sized to receive the ferrule of one feedthrough in the plurality of feedthroughs,

wherein the plurality of feedthroughs are positioned within the plurality of apertures within the recess.

12. The connector assembly of claim 11, further comprising a ground pin,

wherein the ground pin is sized to fit within one of the plurality of apertures within the recess of the array plate,

wherein the ground pin is positioned within one of the plurality of apertures within the recess, and

wherein the ground pin is positioned adjacent to the plurality of feedthroughs.

13. The connector assembly of claim 1, wherein the circuit is a flexible circuit.

14. An implantable medical device comprising:

a substantially sealed housing encasing control electronics; and

a connector assembly that extends through the substantially sealed housing and provides electrical connections between the control electronics and a component of the implantable medical device located exterior to the substantially sealed housing, wherein the connector assembly comprises;

a plurality of feedthroughs mounted in a conductive array plate, each feedthrough in the plurality of feedthroughs including a feedthrough pin electrically isolated from the conductive array plate by an insulator;

an electronic module assembly including a plurality of conductive strips set in an non-conductive block, wherein each of the plurality of conductive strips is in physical and electrical contact with a corresponding one of the feedthrough pins of the plurality of feedthroughs at a first set of electrical joints,

wherein the plurality of conductive strips is at an angle of less than 135 degrees relative to the feedthrough pins at the first set of electrical joints; and

at least one circuit, the circuit including a plurality of conductors corresponding to the plurality of feedthroughs, wherein each of the plurality of conductors of the circuit is in physical and electrical contact with a corresponding one of the conductive strips of the plurality of conductive strips of the electronic module assembly at a second set of electrical joints,

wherein the plurality of conductors is at an angle of less than 135 degrees relative to the plurality of conductive strips at the second set of electrical joints.

15. The implantable medical device of claim 14, wherein the feedthrough pins extend in an about opposite direction as compared to the conductors of the circuit on opposing ends of the conductive strips of the electronic module assembly.

16. The implantable medical device of claim 14,

wherein the plurality of conductive strips are formed from one or more metal stampings, and

wherein the non-conductive block comprises an overmold that fixes the position of the conductive strips relative to each other.

17. The implantable medical device of claim 14, wherein the feedthrough pins extend though the array plate and the electronic module assembly is positioned within a recess of the array plate.

18. The implantable medical device of claim 17, further comprising a capacitor,

wherein the capacitor is positioned between electronic module assembly and the array plate,

wherein the capacitor is within the recess of the array plate,

wherein the capacitor is in electrical contact with the array plate and in electrical contact with more than one of the feedthrough pins such that the capacitor functions as a filter for the feedthrough pins in electrical contact with the capacitor,

wherein the capacitor includes a set of apertures corresponding to the feedthrough pins in electrical contact with the capacitor, and

wherein the capacitor has a parallelogram-shaped profile.

19. The implantable medical device of claim 18,

wherein the capacitor comprises an upper side and a lower side,

wherein the apertures in the set of apertures extend from the upper side through the lower side,

wherein the capacitor further comprises annular members of conductive material over the upper side and around each aperture in the set of apertures, and

wherein the feedthrough pins in electrical contact with the capacitor are soldered to the apertures of the capacitor by application of solder preforms upon the annular members of conductive material.

20. The implantable medical device of claim 18,

wherein the capacitor is a first capacitor,

wherein the connector assembly includes a second capacitor,

wherein the second capacitor has substantially the same shape as the first capacitor, and

wherein the first and second capacitors are each in electrical contact with half of the feedthrough pins.

21. The implantable medical device of claim 17,

wherein each feedthrough in the plurality of feedthroughs includes an electrically conductive ferrule,

wherein the insulator of each feedthrough is located within the ferrule,

wherein the feedthrough pin of each feedthrough extends through the insulator and through the ferrule,

wherein the array plate includes a plurality of apertures within the recess, each of the plurality of apertures being sized to receive the ferrule of one feedthrough in the plurality of feedthroughs,

wherein the plurality of feedthroughs are positioned within the plurality of apertures within the recess.

22. The implantable medical device of claim 21, further comprising a ground pin,

wherein the ground pin is sized to fit within one of the plurality of apertures within the recess of the array plate,

wherein the ground pin is positioned within one of the plurality of apertures within the recess, and

wherein the ground pin is positioned adjacent to the plurality of feedthroughs.

23. The implantable medical device of claim 14, wherein the component of the implantable medical device located exterior to the substantially sealed housing includes an antenna for telemetry when the implantable medical device is implanted within a patient.

24. The implantable medical device of claim 14, wherein the circuit is a flexible circuit.

25. A method of manufacturing a connector assembly for an implantable medical device, the method comprising:

positioning a plurality of feedthroughs within the apertures of an array plate, wherein each feedthrough in the plurality of feedthroughs includes an electrically conductive ferrule, an insulator located within the ferrule, and a feedthrough pin extending through the insulator such that it is electrically isolated from the ferrule by the insulator;

electrically connecting and mechanically securing the ferrules of the feedthroughs to the array plate;

positioning a capacitor including a set of apertures corresponding to more than one of the feedthrough pins over the feedthrough pins and into the recess of the array plate;

electrically connecting and mechanically securing the capacitor to the array plate and to the more than one of the feedthrough pins such that the capacitor functions as a filter for the feedthrough pins in electrical contact with the capacitor;

positioning an electronic module assembly including a set of conductive strips corresponding to more than one of the feedthrough pins over the feedthrough pins such that the capacitor is positioned between the electronic module assembly and the array plate;

electrically connecting and mechanically securing each of the feedthrough pins to the corresponding conductive strip in the electronic module assembly to form a first set of electrical joints,

wherein the plurality of conductive strips is at an angle of less than 135 degrees relative to the feedthrough pins after forming the first set of electrical joints;

positioning at least one circuit, the circuit including a plurality of conductors corresponding to the plurality of feedthroughs, adjacent to a corresponding one of the conductive strips of the plurality of conductive strips of the electronic module assembly; and

electrically connecting and mechanically securing each of the plurality of conductors of the circuit to the corresponding one of the conductive strips of the plurality of conductive strips of the electronic module assembly to form a second set of electrical joints;

wherein the plurality of conductors is at an angle of less than 135 degrees relative to the plurality of conductive strips after forming the second set of electrical joints.

26. The method of claim 25,

wherein electrically connecting and mechanically securing the capacitor to the array plate and to the more than one of the feedthrough pins comprises soldering the capacitor to the array plate and to the more than one of the feedthrough pins,

wherein soldering the capacitor to the array plate and to the more than one of the feedthrough pins comprises:

positioning solder preforms over the feedthrough pins;

positioning solder wire placed adjacent to the capacitor along major sides of the recess; and

heating an assembly including the array plate, the plurality of feedthroughs, the capacitor, the solder preforms and the solder wire to melt the solder preforms and the solder wire to solder the capacitor to the array plate and to the more than one of the feedthrough pins.

27. The method of claim 25,

wherein electrically connecting and mechanically securing each of the feedthrough pins to the corresponding conductive strip in the electronic module assembly comprises welding each of the feedthrough pins to the corresponding conductive strip in the electronic module assembly, and

wherein electrically connecting and mechanically securing each of the plurality of conductors of the circuit to the corresponding one of the conductive strips comprises soldering each of the plurality of conductors of the circuit to the corresponding one of the conductive strips of the plurality of conductive strips of the electronic module assembly.

28. The method of claim 25, further comprising trimming the feedthrough pins to a desired length after positioning the electronic module assembly over the feedthrough pins and before electrically connecting and mechanically securing each of the feedthrough pins to the corresponding conductive strips in the electronic module assembly.

29. The method of claim 25, wherein the conductive strips in the electronic module assembly include apertures to receive the feedthrough pins.

30. The method of claim 25,

wherein the electronic module assembly includes the plurality of conductive strips set in a non-conductive block,

the method further comprising:

overmolding the non-conductive block on a stamping including each of the plurality of conductive strips; and

breaking off a removable tab of the stamping to electrically isolate the plurality of conductive strips from each other in the electronic module assembly, the removable tab being configured to maintain the relative positions of the plurality of conductive strips before overmolding the non-conductive block on the stamping.

31. The method of claim 25,

wherein each feedthrough in the plurality of feedthroughs includes an electrically conductive ferrule,

wherein the insulator of each feedthrough is located within the ferrule,

wherein the feedthrough pin of each feedthrough extends through the insulator and through the ferrule,

the method further comprising:

machining the array plate to form the recess and a plurality of apertures within the recess;

positioning each of the plurality of feedthroughs within the plurality of apertures within the recess; and

electrically connecting and mechanically securing the conductive ferrules of the plurality of feedthroughs to the array plate.

32. The method of claim 25, further comprising, after machining the array plate, sputtering gold along the major sides of the recess to form capacitor contact pads.

33. The method of claim 25, further comprising:

positioning a ground pin within one of the plurality of apertures within the recess of the array plate; and

electrically connecting and mechanically securing the ground pin to the array plate.