MRI-safe implantable medical device

• US 8,620,454 B2
• Filed: 03/14/2013
• Issued: 12/31/2013
• Est. Priority Date: 03/30/2004
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Wahlstrand, Carl D., Skime, Robert M., Hrdlicka, Gregory A., Olsen, James M., Bolea, Stephen L.
• Primary Examiner(s): MANUEL, GEORGE C
• Application Number:
  US13/803,394
• Publication Number:
  US 20130204337A1
• Time in Patent Office: 292 Days
• Field of Search: 607/116
• US Class Current: 607/116
• 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 1/0534 Electrodes for deep brain stimulation
• CPC Class Codes: A61N 1/0551 Spinal or peripheral nerve electrodes
• CPC Class Codes: A61N 1/086 Magnetic resonance imaging [MRI] compatible leads
• CPC Class Codes: A61N 1/36071 Pain

Abstract

A medical lead is provided for use in a pulse stimulation system of the type which includes a pulse generator for producing electrical stimulation therapy. The lead comprises an elongate insulating body and at least one electrical conductor within the insulating body. The conductor has a proximal end configured to be electrically coupled to the pulse generator and has a DC resistance in the range of 375-2000 ohms. At least one distal electrode is coupled to the conductor.

Claims

1. A medical lead for use in an implantable stimulation system of the type which includes a stimulator for generating electrical stimulation therapy, the lead comprising:

an implantable elongate insulating body;

an electrode on a distal end of the insulating body; and

an electrical conductor within the insulating body that is connected to the electrode, the conductor having an absolute impedance of at least 15 ohms per centimeter at 64 MHz.

2. The medical lead of claim 1, further comprising a contact on a proximal end of the insulating body, wherein the conductor is connected to the contact.

3. The medical lead of claim 1, wherein the conductor includes a discrete inductor.

4. The medical lead of claim 3, wherein the discrete inductor is located within the insulating body in proximity to the electrode.

5. The medical lead of claim 1, wherein at least a portion of the conductor is helical.

6. The medical lead of claim 1, further comprising a second electrical conductor within the insulating body, the electrical conductor being co-radially wound with the second electrical conductor.

7. A medical lead for use in an implantable stimulation system of the type which includes a stimulator for generating electrical stimulation therapy, the lead comprising:

an implantable elongate insulating body;

an electrode on a distal end of the insulating body;

an electrical conductor within the insulating body that is connected to the electrode, the conductor having an absolute impedance of at least 15 ohms per centimeter at 64 MHz, the conductor having discrete elements positioned at multiple locations along the conductor where each of the discrete elements contributes to the absolute impedance.

8. The medical lead of claim 7, further comprising a contact on a proximal end of the insulating body, wherein the conductor is connected to the contact.

9. The medical lead of claim 7, wherein at least a portion of the conductor is helical.

10. The medical lead of claim 7, further comprising a second electrical conductor within the insulating body, the electrical conductor being co-radially wound with the second electrical conductor.

11. A medical lead for use in an implantable stimulation system of the type which includes a stimulator for generating electrical stimulation therapy, the lead comprising:

an implantable elongate insulating body;

an electrode on a distal end of the insulating body;

an electrical conductor within the insulating body that is connected to the electrode, the conductor having an absolute impedance of at least 15 ohms per centimeter at 64 MHz while having a DC resistance less than 15 ohms per centimeter.

12. The medical lead of claim 11, further comprising a contact on a proximal end of the insulating body, wherein the conductor is connected to the contact.

13. The medical lead of claim 11, wherein the conductor includes a discrete inductor.

14. The medical lead of claim 13, wherein the discrete inductor is located within the insulating body in proximity to the electrode.

15. The medical lead of claim 11, wherein at least a portion of the conductor is helical.

16. The medical lead of claim 11, further comprising a second electrical conductor within the insulating body, the electrical conductor being co-radially wound with the second electrical conductor.

17. A medical lead for use in an implantable stimulation system of the type which includes a stimulator for generating electrical stimulation therapy, the lead comprising:

an implantable elongate insulating body;

a conductive body on a distal end of the insulating body;

an electrical conductor within the insulating body, the conductor having an absolute impedance of at least 15 ohms per centimeter at 64 MHz, the conductor having an inductor that is disposed within the conductive body.

18. The medical lead of claim 17, wherein the conductor is connected to the conducting body.

19. The medical lead of claim 17, wherein at least a portion of the conductor is helical.

20. The medical lead of claim 17, further comprising a second electrical conductor within the insulating body, the electrical conductor being co-radially wound with the second electrical conductor.