Magnetically shielded conductor

• US 6,506,972 B1
• Filed: 01/22/2002
• Issued: 01/14/2003
• Est. Priority Date: 01/22/2002
• Status: Expired due to Fees

• Current Assignee: Biophan Technologies Incorporated
• Original Assignee: Nanoset LLC
• Inventors: Wang, Xingwu
• Primary Examiner(s): Nguyen, Chau N.
• Application Number:
  US10/054,407
• Time in Patent Office: 357 Days
• Field of Search: 174/36, 174/113.R, 174/102.SC, 174/102.P, 333/12, 333/243
• US Class Current: 174/36
• CPC Class Codes: A61N 1/086 Magnetic resonance imaging [MRI] compatible leads
• CPC Class Codes: A61N 1/3718 Monitoring of or protection against external electromagnetic fields or currents
• CPC Class Codes: B82Y 25/00 Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
• CPC Class Codes: H01B 11/10 Screens specially adapted for reducing interference from external sources
• CPC Class Codes: H01B 11/1083 the coating containing magnetic material
• CPC Class Codes: H01F 1/0063 in a non-magnetic matrix, e.g. granular solids granular films H01F10/007
• CPC Class Codes: H01F 10/007 ultrathin or granular films H01F10/005 and H01F10/3227 take precedence; applying ultrathin or granular layers to substrates H01F41/301
• CPC Class Codes: H01F 10/324 Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer

Abstract

A magnetically shielded conductor assembly containing a conductor disposed within an insulating matrix, and a layer composed of nanomagentic material disposed around the first conductor. The conductor has a resistivity at 20 degrees Centigrade of from about 1 to about 100 microohm-centimeters. The insulating matrix is comprised of nano-sized particles having a maximum dimension of from about 10 to about 100 nanometers. The insulating matrix has a resistivity of from about 1,000,000,000 to about 10,000,000,000,000 ohm-centimeter. The nanomagnetic material has an average particle size of less than about 100 nanometers. The layer of nanomagnetic material has a saturation magnetization of from about 200 to about 26,000 Gauss and a thickness of less than about 2 microns. The magnetically shielded conductor assembly is flexible, having a bend radius of less than 2 centimeters.

Claims

1. A magnetically shielded conductor assembly comprised of a first conductor disposed within an insulating matrix, and a layer comprised of nanomagentic material disposed around said first conductor, provided that such nanomagnetic material is not contiguous with said first conductor, wherein:

(a) said first conductor has a resistivity at 20 degrees Centigrade of from about 1 to about 100 micro ohm-centimeters,

(b) said insulating matrix is comprised of nano-sized particles wherein at least about 90 weight percent of said particles have a maximum dimension of from about 10 to about 100 nanometers;

(c) said insulating matrix has a resistivity of from about 1,000,000,000 to about 10,000,000,000,000 ohm-centimeter;

(d) said nanomagnetic material has an average particle size of less than about 100 nanometers;

(e) said layer of nanomagnetic material has a saturation magnetization of from about 200 to about 26,000 Gauss and a thickness of less than about 2 microns; and

(f) said magnetically shielded conductor assembly is flexible, having a bend radius of less than 2 centimeters.

2. The magnetically shielded conductor assembly as recited in claim 1, wherein said conductor assembly is comprised of a second conductor disposed within said insulating matrix.

3. The magnetically shielded conductor assembly as recited in claim 2, wherein said second conductor is substantially parallel to said first conductor.

4. The magnetically shielded conductor assembly as recited in claim 3, wherein said second conductor is contiguous with said first conductor.

5. The magnetically shielded conductor assembly as recited in claim 3, wherein said second conductor is not contiguous with said first conductor.

6. The magnetically shielded conductor assembly as recited in claim 5, wherein said first conductor has a first direction of current flow and said second conductor has a second direction of current flow;

and said first direction of current flow is opposite to said second direction of current flow.

7. The magnetically shielded conductor assembly as recited in claim 6, wherein each of said first conductor and said second conductor consists essentially of copper.

8. The magnetically shielded conductor assembly as recited in claim 7, wherein said nanomagnetic material is comprised of atoms of iron.

9. The magnetically shielded conductor assembly as recited in claim 7, wherein said nanomagnetic material is comprised of atoms of cobalt.

10. The magnetically shielded conductor assembly as recited in claim 7, wherein said nanomagnetic material is comprised of atoms of nickel.

11. The magnetically shielded conductor assembly as recited in claim 1, further comprising a power supply.

12. The magnetically shielded conductor assembly as recited in claim 2, further comprising a power supply.

13. The magnetically shielded conductor assembly as recited in claim 12, wherein said power supply is magnetically shielded.

14. The magnetically shielded conductor assembly as recited in claim 13, wherein said power supply is coated with a layer of nanomagnetic particles.

15. The magnetically shielded conductor assembly as recited in claim 1, further comprising a load connected to said magnetically shielded conductor assembly.

16. The magnetically shielded conductor assembly as recited in claim 15, further comprising a controller connected to said load.

17. The magnetically shielded conductor assembly as recited in claim 16, wherein said controller is connected to said power supply.

18. The magnetically shielded conductor assembly as recited in claim 17, comprising means of delivering pulses of direct current from said power supply to said load.

19. The magnetically shielded conductor assembly as recited in claim 18, wherein said load is magnetically shielded.

20. The magnetically shielded conductor assembly as recited in claim 19, wherein said load is a pacemaker.