Magnetic resonance imaging interference immune device

• US 7,388,378 B2
• Filed: 10/12/2005
• Issued: 06/17/2008
• Est. Priority Date: 06/24/2003
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Gray, Robert W., Helfer, Jeffrey L.
• Primary Examiner(s): Shrivastav; Brij B
• Application Number:
  US11/248,862
• Publication Number:
  US 20060030774A1
• Time in Patent Office: 979 Days
• Field of Search: 324/322, 324/318, 600407-455, 607/116, 607/2
• US Class Current: 324/318
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/086 Magnetic resonance imaging [MRI] compatible leads
• CPC Class Codes: A61N 1/37 Monitoring; Protecting
• CPC Class Codes: A61N 1/3718 Monitoring of or protection against external electromagnetic fields or currents
• CPC Class Codes: G01R 33/3685 Means for reducing sheath currents, e.g. RF traps, baluns

Abstract

A medical assembly includes a multi-wire lead having a plurality of coiling loops. The multi-wire lead has a gap region and a non-gap region. The gap region has adjacent coiling loops of the multi-wire lead with gaps therebetween so as to form different impedance in the gap region than impedance in the non-gap region. The non-gap region has adjacent coiling loops of the multi-wire lead with no gaps therebetween. The gaps may provide inter-loop capacitance. The multi-wire lead may have a plurality of gap regions, each gap region having a non-gap region therebetween.

Claims

1. A medical assembly, comprising:

a multi-wire lead having a plurality of coiling loops;

said multi-wire lead having a gap region and a non-gap region;

said gap region having adjacent coiling loops of said multi-wire lead with predefined gaps therebetween;

said non-gap region having adjacent coiling loops of said multi-wire lead with no gaps therebetween.

2. The medical assembly as claimed in claim 1, wherein said predefined gaps provide inter-loop capacitance.

3. The medical assembly as claimed in claim 1, wherein said gap region forms different impedance in said gap region than impedance in said non-gap region.

4. The medical assembly as claimed in claim 1, wherein said multi-wire lead has a plurality of gap regions, each gap region having a non-gap region therebetween.

5. The medical assembly as claimed in claim 1, wherein said multi-wire lead is a deep brain stimulation lead.

6. The medical assembly as claimed in claim 1, wherein said multi-wire lead is a pacing lead.

7. The medical assembly as claimed in claim 1, wherein said multi-wire lead is a pacing lead.

8. A medical assembly, comprising:

a multi-wire lead having a plurality of coiling loops;

said multi-wire lead having a gap region and a non-gap region;

said gap region having adjacent coiling loops of said multi-wire lead with gaps therebetween wherein a width of said gap is adjusted to modify an electrical property of said multi-wire lead;

said non-gap region having adjacent coiling loops of said multi-wire lead with no gaps therebetween.

9. A medical assembly, comprising:

a multi-wire lead having a plurality of coiling loops;

said multi-wire lead having a gap region and a non-gap region;

said gap region having adjacent coiling loops of said multi-wire lead with gaps therebetween wherein said gaps include a material therein, said material adjusting an electrical property of said multi-wire lead;

said non-gap region having adjacent coiling loops of said multi-wire lead with no gaps therebetween.

10. A medical assembly, comprising:

a multi-wire lead having a plurality of wires, each wire having a plurality of coiling loops;

said multi-wire lead having a gap region and a non-gap region;

said gap region having a first gap between a coiling loop of a first wire and a coiling loop of a second wire;

said non-gap region having a second gap between a coiling loop of a first wire and a coiling loop of a second wire, said first gap being greater than said second gap.

11. The medical assembly as claimed in claim 10, wherein said gap region forms different impedance in said gap region than impedance in said non-gap region.

12. The medical assembly as claimed in claim 10, wherein said multi-wire lead has a plurality of gap regions, each gap region having a non-gap region therebetween.

13. The medical assembly as claimed in claim 10, wherein said multi-wire lead is a deep brain stimulation lead.

14. The medical assembly as claimed in claim 10, wherein a width of said gap is adjusted to modify an electrical property of said multi-wire lead.

15. The medical assembly as claimed in claim 10, wherein said gaps include a material therein, said material adjusting an electrical property of said multi-wire lead.

16. The medical assembly as claimed in claim 10, wherein said multi-wire lead is a pacing lead.

17. A medical assembly, comprising:

a multi-wire lead having a plurality of wires, each wire having a plurality of coiling loops;

said multi-wire lead having a gap region and a non-gap region;

said gap region having a first lead intra-coiling loop gap between a first coiling loop of a first wire and a second coiling loop of the first wire;

said non-gap region having a second lead intra-coiling loop gap between a third coiling loop of the first wire and a fourth coiling loop of the first wire, said first lead intra-coiling loop gap being greater than said lead intra-coiling loop second gap.

18. The medical assembly as claimed in claim 17, wherein said gap region forms different impedance in said gap region than impedance in said non-gap region.

19. The medical assembly as claimed in claim 17, wherein said multi-wire lead has a plurality of gap regions, each gap region having a non-gap region therebetween.

20. The medical assembly as claimed in claim 17, wherein said multi-wire lead is a deep brain stimulation lead.

21. The medical assembly as claimed in claim 17, wherein a width of said gap is adjusted to modify an electrical property of said multi-wire lead.

22. The medical assembly as claimed in claim 17, wherein said gaps include a material therein, said material adjusting an electrical property of said multi-wire lead.

23. A medical assembly, comprising:

a multi-wire lead having a plurality of conductive wires and a plurality of non-conductive wires, each conductive wire having a plurality of coiling loops, each non-conductive wire having a plurality of coiling loops;

said coiling loops of a non-conductive wire being positioned between adjacent coiling loops of two conductive wires to form a lead intra-coiling loop non-conductive gap between the adjacent coiling loops of two conductive wires.

24. The medical assembly as claimed in claim 23, wherein said non-conductive wires are polymer wires.

25. The medical assembly as claimed in claim 23, wherein said multi-wire lead has a gap region and a non-gap region;

said gap region having a first lead intra-coiling loop gap between a first coiling loop of a first wire and a second coiling loop of the first wire;

said non-gap region having a second lead intra-coiling loop gap between a third coiling loop of the first wire and a fourth coiling loop of the first wire, said first lead intra-coiling loop gap being greater than said lead intra-coiling loop second gap.

26. The medical assembly as claimed in claim 25, wherein said gap region forms different impedance in said gap region than impedance in said non-gap region.

27. The medical assembly as claimed in claim 25, wherein said multi-wire lead has a plurality of gap regions, each gap region having a non-gap region therebetween.

28. The medical assembly as claimed in claim 25, wherein said multi-wire lead is a deep brain stimulation lead.

29. The medical assembly as claimed in claim 25, wherein said multi-wire lead is a pacing lead.