Laminate of magnetic material and method of making

• US 7,035,688 B2
• Filed: 04/30/2004
• Issued: 04/25/2006
• Est. Priority Date: 04/30/2004
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Kast, John E., Peters, Charles E., Clayton, Jeffrey J., Deininger, Steve T.
• Primary Examiner(s): Bockelman, Mark
• Assistant Examiner(s): Bertram, Eric
• Application Number:
  US10/836,116
• Publication Number:
  US 20050246001A1
• Time in Patent Office: 725 Days
• Field of Search: 607/36, 607/61, 607/29, 607/34, 336/84.M, 298/30
• US Class Current: 607/36
• CPC Class Codes: A61N 1/375 Constructional arrangements, e.g. casings
• CPC Class Codes: B32B 2307/206 Insulating
• CPC Class Codes: B32B 2307/208 Magnetic, paramagnetic
• CPC Class Codes: B32B 2535/00 Medical equipment, e.g. bandage, prostheses, catheter medical patches B32B2556/00
• CPC Class Codes: B32B 3/30 characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs apertured layer B32B3/266; layer with cavities or internal voids B32B3/26
• CPC Class Codes: B32B 7/025 Electric or magnetic properties

Abstract

A laminate having a plurality of layers of magnetic material sandwiched together having a first side and a second side and a method of making the laminate. The plurality of layers of magnetic material having a plurality of radial grooves. A first insulative layer applied over the first side of the plurality of layers of magnetic material. A lead wire applied to over first insulative layer at a predetermined location on the first side of the plurality of layers of magnetic material. A second insulative layer applied to the first side of the plurality of layers of magnetic material over the lead wire. A third insulative layer applied to the second side of the plurality of layers of magnetic material. Thus, the laminate is ready to receive a coil.

Claims

1. A laminate, comprising:

a plurality of layers of magnetic material sandwiched together having a first side and a second side;

said plurality of layers of magnetic material having a plurality of radial grooves;

a first insulative layer applied over said first side of said plurality of layers of magnetic material;

a lead wire applied to over first insulative layer at a predetermined location on said first side of said plurality of layers of magnetic material;

a second insulative layer applied to said first side of said plurality of layers of magnetic material over said lead wire; and

a third insulative layer applied to said second side of said plurality of layers of magnetic material;

whereby said laminate is ready to receive a coil.

2. A laminate as in claim 1 wherein each of said first insulative layer, said second insulative layer and said third insulative layer comprises a polymer.

3. A laminate as in claim 2 wherein said polymer comprises polyimide.

4. A laminate as in claim 1 wherein said third insulative layer is adhesively applied.

5. A laminate as in claim 1 wherein said plurality of layers of magnetic material are sandwiched together with intervening adhesive layers.

6. A laminate as in claim 1 wherein said lead wire is adhesively applied.

7. A laminate as in claim 1 wherein said second insulative layer is adhesively applied to said first side of said first insulative layer over said lead wire.

8. A laminate as in claim 1 wherein said plurality of layer of magnetic material comprises three layers.

9. A laminate as in claim 1 wherein said predetermined location is selected to accommodate connection with said coil.

10. A laminate as in claim 1 further comprising a second lead wire applied at a second predetermined location on said first side of said plurality of layers of magnetic material.

11. A laminate as in claim 10 wherein said second predetermined location is selected to accommodate connection with said coil.

12. A method of making a laminate, comprising the steps of:

sandwiching together a plurality of layers of magnetic material, said plurality of layers of magnetic material having a first side and a second side;

creating a plurality of radial grooves in said plurality of layers of magnetic material;

applying a first insulative layer over said first side of said plurality of layers of magnetic material;

applying a lead wire over said first insulative layer at a predetermined location on said first side of said plurality of layers of magnetic material;

applying a second insulative layer to said first side of said plurality of layers of magnetic material over said lead wire; and

whereby said laminate is ready to receive a coil.

13. A method as in claim 12 further comprising the step of applying a third insulative layer to said second side of said plurality of layers of magnetic material.

14. A method as in claim 13 wherein each of said first insulative layer, said second insulative layer and said third insulative layer comprises a polymer.

15. A method as in claim 14 wherein said polymer comprises polyimide.

16. A method as in claim 12 wherein said sandwiching together step comprises adhesively securing said plurality of layers of magnetic material together.

17. A method as in claim 12 wherein said applying said lead wire step comprises adhesively securing said lead wire.

18. A method as in claim 12 wherein said applying said second insulative layer step comprises adhesively securing said second insulative layer to said first insulative layer over said lead wire.

19. A method as in claim 12 wherein said applying said third insulative layer step comprises adhesively securing said third insulative layer to said second side of said plurality of layers of polymer.

20. A method as in claim 12 wherein said plurality of layer of magnetic material comprises three layers.

21. A method as in claim 12 wherein said predetermined location is selected to accommodate connection with said coil.

22. A method as in claim 12 further comprising the step of applying a second lead wire at a second predetermined location on said first side of said plurality of layers of magnetic material.

23. A method as in claim 22 wherein said second predetermined location is selected to accommodate connection with said coil.