MEDICAL DEVICE WITH AN ELECTRICALLY CONDUCTIVE ANTI-ANTENNA MEMBER

• US 20070173911A1
• Filed: 03/14/2007
• Published: 07/26/2007
• Est. Priority Date: 02/20/2001
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Biophan Technologies Incorporated
• Inventors: Gray, Robert
• Application Number:
  US11/685,999
• Publication Number:
  US 20070173911A1
• Time in Patent Office: Days
• US Class Current: 607/63
• CPC Class Codes: A61B 2090/0418 Compensation
• CPC Class Codes: A61B 2090/0481 against EM radiation, e.g. microwave
• CPC Class Codes: A61B 90/04 Protection of tissue around surgical sites against effects of non-mechanical surgery, e.g. laser surgery protection of eyes against laser radiation A61F9/022
• 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 1/16 Screening or neutralising undesirable influences from or using, atmospheric or terrestrial radiation or fields using atmospheric electricity or earth currents H05F3/00
• CPC Class Codes: A61N 1/36125 Details of circuitry or electric components
• CPC Class Codes: H03H 1/0007 of radio frequency interference filters

Abstract

A lead includes a conductor having a distal end and a proximal end and a resonant circuit connected to the conductor. The resonant circuit has a resonance frequency approximately equal to an excitation signal'"'"'s frequency of a magnetic resonance imaging scanner or a resonance frequency not tuned to an excitation signal'"'"'s frequency of a magnetic resonance imaging scanner so as to reduce the current flow through a tissue area, thereby reducing tissue damage. The resonant circuit may be included in an adapter that provides an electrical bridge between a lead a medical device such as an electrode, sensor, or signal generator. The resonant circuit may also be included directly in the housing of a medical device.

Claims

1. A lead, comprising:

a conductor having a distal end and a proximal end; and

a resonant circuit operatively connected to said conductor;

said resonant circuit having a resonance frequency not tuned to a frequency of an electromagnetic radiation source.

2. The lead as claimed in claim 1, wherein said resonant circuit is operatively connected at said distal end of said conductor.

3. The lead as claimed in claim 1, wherein said resonant circuit is operatively connected at said proximal end of said conductor.

4. The lead as claimed in claim 1, wherein said resonant circuit is an inductor connected in parallel with a capacitor.

5. The lead as claimed in claim 1, wherein said resonant circuit is an inductor connected in parallel with a capacitor and a resistor, said resistor and capacitor being connected in series.

6. The lead as claimed in claim 1, further comprising:

a heat receiving mass;

said heat receiving mass being located adjacent to said resonant circuit and dissipating the heat generated by said resonant circuit in a manner that is substantially non-damaging to surrounding tissue.

7. The lead as claimed in claim 2, further comprising:

a heat receiving mass;

said heat receiving mass being located adjacent to said resonant circuit and dissipating the heat generated by said resonant circuit in a manner that is substantially non-damaging to surrounding tissue.

8. The lead as claimed in claim 3, further comprising:

a heat receiving mass;

said heat receiving mass being located adjacent to said resonant circuit and dissipating the heat generated by said resonant circuit.

9. The lead as claimed in claim 1, further comprising:

a heat dissipating structure;

said heat dissipating structure being located adjacent to said resonant circuit and dissipating the heat generated by said resonant circuit in a manner that is substantially non-damaging to surrounding tissue.

10. The lead as claimed in claim 2, further comprising:

a heat dissipating structure;

said heat dissipating structure being located adjacent to said resonant circuit and structure dissipating the heat generated by said resonant circuit in a manner that is substantially non-damaging to surrounding tissue.

11. The lead as claimed in claim 3, further comprising:

a heat dissipating structure;

said heat dissipating structure being located adjacent to said resonant circuit and dissipating the heat generated by said resonant circuit.

12. The lead as claimed in claim 1, wherein the electromagnetic radiation source is a security system.

13. The lead as claimed in claim 1, wherein the electromagnetic radiation source is a magnetic resonance imaging scanner.

14. The lead as claimed in claim 1, wherein said resonant circuit is operatively connected near said distal end of said conductor.

15. The lead as claimed in claim 1, wherein said resonant circuit is operatively connected near said proximal end of said conductor.

16. A lead, comprising:

a conductor having a distal end and a proximal end;

said conductor being a coiled conductor having a resonant circuit thereof;

said resonant circuit having a resonance frequency not tuned to a frequency of an electromagnetic radiation source.

17. The lead as claimed in claim 16, wherein said resonant circuit is located at said distal end of said conductor.

18. The lead as claimed in claim 16, wherein said resonant circuit is located at said proximal end of said conductor.

19. The lead as claimed in claim 16, wherein said resonant circuit includes a capacitor connected to two distinct loops of said coiled conductor.

20. The lead as claimed in claim 16, wherein said resonant circuit includes an inductor formed from a portion of said coiled conductor and a capacitor connected to two distinct loops of said coiled conductor.

21. The lead as claimed in claim 16, wherein said resonant circuit includes an inductor formed from a portion of said coiled conductor and a capacitor and a resistor, said resistor and capacitor being connected to two distinct loops of said coiled conductor.