MEDICAL DEVICE WITH A MRI-INDUCED SIGNAL ATTENUATING MEMBER

• US 20070198073A1
• Filed: 11/30/2006
• Published: 08/23/2007
• Est. Priority Date: 02/20/2001
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Biophan Technologies Incorporated
• Inventors: MacDonald, Stuart, Connelly, Patrick
• Application Number:
  US11/565,291
• Publication Number:
  US 20070198073A1
• Time in Patent Office: Days
• US Class Current: 607/122
• CPC Class Codes: A61N 1/056 Transvascular endocardial electrode systems
• 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 1/3718 Monitoring of or protection against external electromagnetic fields or currents
• CPC Class Codes: A61N 1/37512 Pacemakers
• CPC Class Codes: A61N 1/37518 Anchoring of the implants, e.g. fixation
• CPC Class Codes: H01R 13/5224 for medical use
• CPC Class Codes: H01R 13/6464 by adding capacitive elements
• CPC Class Codes: H01R 13/6598 Shield material
• CPC Class Codes: H01R 13/719 specially adapted for high frequency, e.g. with filters
• CPC Class Codes: H01R 2201/12 for medicine and surgery

Abstract

A lead includes a conductor having a distal end and a proximal end. The lead also includes a filter circuit in the conductor. The filter circuit filters out magnetic resonance imaging induced signals.

Claims

1. A lead, comprising:

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

a filter circuit in said conductor;

said filter circuit filtering out magnetic resonance imaging induced signals.

2. The lead as claimed in claim 1, wherein said filter circuit is located at said distal end of said conductor.

3. The lead as claimed in claim 1, wherein said filter circuit is located at said proximal end of said conductor.

4. The lead as claimed in claim 1, wherein said filter circuit is an inductor and a capacitor.

5. The lead as claimed in claim 4, wherein said inductor and capacitor are connected in parallel.

6. The lead as claimed in claim 1, wherein said filter circuit is a tank circuit.

7. The lead as claimed in claim 1, wherein the conductor is a conductor in a bipolar pacing lead circuit.

8. The lead as claimed in claim 1, wherein the conductor is a conductor in a unipolar pacing lead circuit.

9. The lead as claimed in claim 1, wherein the conductor is a conductor in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.

48. The lead as claimed in claim 4, wherein said filter circuit is located at said distal end of said conductor.

10. A lead, comprising:

a plurality of conductors, each conductor having a distal end and a proximal end; and

a plurality of filter circuits, each filter circuit being in a conductor, each filter circuit filtering out magnetic resonance imaging induced signals.

11. The lead as claimed in claim 10, wherein each filter circuit is located at said distal end of said conductor.

12. The lead as claimed in claim 10, wherein each filter circuit is located at said proximal end of said conductor.

13. The lead as claimed in claim 10, wherein each filter circuit is an inductor/capacitor pair.

14. The lead as claimed in claim 13, wherein each inductor/capacitor pair is an inductor connected in parallel with a capacitor.

15. The lead as claimed in claim 10, wherein each filter circuit is a tank circuit.

16. The lead as claimed in claim 10, wherein said conductors are conductors in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.

17. A lead, comprising:

a conductor having a distal end and a proximal end;

an electrode connected to said distal end of said conductor; and

a filter circuit in said conductor;

said filter circuit being connected in series between said conductor and said electrode;

said filter circuit filtering out magnetic resonance imaging induced signals.

18. The lead as claimed in claim 17, wherein said filter circuit is an inductor and a capacitor.

19. The lead as claimed in claim 18, wherein said inductor and capacitor are connected in parallel.

20. The lead as claimed in claim 17, wherein said filter circuit is a tank circuit.

21. The lead as claimed in claim 17, wherein the conductor is a conductor in a bipolar pacing lead circuit.

22. The lead as claimed in claim 17, wherein the conductor is a conductor in a unipolar pacing lead circuit.

23. The lead as claimed in claim 17, wherein the conductor is a conductor in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.

24. A lead, comprising:

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

a filter circuit in said conductor;

said filter circuit attenuating magnetic resonance imaging induced signals.

25. The lead as claimed in claim 24, wherein said filter circuit is located at said distal end of said conductor.

26. The lead as claimed in claim 24, wherein said filter circuit is located at said proximal end of said conductor.

27. The lead as claimed in claim 24, wherein said filter circuit is an inductor and a capacitor.

28. The lead as claimed in claim 27, wherein said inductor and capacitor are connected in parallel.

29. The lead as claimed in claim 24, wherein said filter circuit is a tank circuit.

30. The lead as claimed in claim 24, wherein the conductor is a conductor in a bipolar pacing lead circuit.

31. The lead as claimed in claim 24, wherein the conductor is a conductor in a unipolar pacing lead circuit.

32. The lead as claimed in claim 24, wherein the conductor is a conductor in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.

33. A lead, comprising:

a plurality of conductors, each conductor having a distal end and a proximal end; and

a plurality of filter circuits, each filter circuit being in a conductor, each filter circuit attenuating magnetic resonance imaging induced signals.

34. The lead as claimed in claim 33, wherein each filter circuit is located at said distal end of said conductor.

35. The lead as claimed in claim 33, wherein each filter circuit is located at said proximal end of said conductor.

36. The lead as claimed in claim 33, wherein each filter circuit is an inductor/capacitor pair.

37. The lead as claimed in claim 36, wherein each inductor/capacitor pair is an inductor connected in parallel with a capacitor.

38. The lead as claimed in claim 33, wherein each filter circuit is a tank circuit.

39. The lead as claimed in claim 33, wherein said conductors are conductors in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.

40. A lead, comprising:

a conductor having a distal end and a proximal end;

an electrode connected to said distal end of said conductor; and

a filter circuit in said conductor;

said filter circuit being connected in series between said conductor and said electrode;

said filter circuit attenuating magnetic resonance imaging induced signals.

41. The lead as claimed in claim 40, wherein said filter circuit is an inductor and a capacitor.

42. The lead as claimed in claim 41, wherein said inductor and capacitor are connected in parallel.

43. The lead as claimed in claim 40, wherein said filter circuit is a tank circuit.

44. The lead as claimed in claim 40, wherein the conductor is a conductor in a bipolar pacing lead circuit.

45. The lead as claimed in claim 40, wherein the conductor is a conductor in a unipolar pacing lead circuit.

46. The lead as claimed in claim 40, wherein the conductor is a conductor in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.

47. A lead, comprising:

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

a filter circuit in said conductor;

said filter circuit limiting magnetic resonance imaging induced signals.

49. The lead as claimed in claim 47, wherein said filter circuit is located at said proximal end of said conductor.

50. The lead as claimed in claim 47, wherein said filter circuit is an inductor and a capacitor.

51. The lead as claimed in claim 50, wherein said inductor and capacitor are connected in parallel.

52. The lead as claimed in claim 47, wherein said filter circuit is a tank circuit.

53. The lead as claimed in claim 47, wherein the conductor is a conductor in a bipolar pacing lead circuit.

54. The lead as claimed in claim 47, wherein the conductor is a conductor in a unipolar pacing lead circuit.

55. The lead as claimed in claim 47, wherein the conductor is a conductor in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.

56. A lead, comprising:

a plurality of conductors, each conductor having a distal end and a proximal end; and

a plurality of filter circuits, each filter circuit being in a conductor, each filter circuit limiting magnetic resonance imaging induced signals.

57. The lead as claimed in claim 56, wherein each filter circuit is located at said distal end of said conductor.

58. The lead as claimed in claim 56, wherein each filter circuit is located at said proximal end of said conductor.

59. The lead as claimed in claim 56, wherein each filter circuit is an inductor/capacitor pair.

60. The lead as claimed in claim 59, wherein each inductor/capacitor pair is an inductor connected in parallel with a capacitor.

61. The lead as claimed in claim 56, wherein each filter circuit is a tank circuit.

62. The lead as claimed in claim 56, wherein said conductors are conductors in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.

63. A lead, comprising:

a conductor having a distal end and a proximal end;

an electrode connected to said distal end of said conductor; and

a filter circuit in said conductor;

said filter circuit being connected in series between said conductor and said electrode;

said filter circuit limiting magnetic resonance imaging induced signals.

64. The lead as claimed in claim 63, wherein said filter circuit is an inductor and a capacitor.

65. The lead as claimed in claim 64, wherein said inductor and capacitor are connected in parallel.

66. The lead as claimed in claim 63, wherein said filter circuit is a tank circuit.

67. The lead as claimed in claim 63, wherein the conductor is a conductor in a bipolar pacing lead circuit.

68. The lead as claimed in claim 63, wherein the conductor is a conductor in a unipolar pacing lead circuit.

69. The lead as claimed in claim 63, wherein the conductor is a conductor in a cardiac defibrillator lead, a deep brain stimulating lead, or a conductor in a nerve stimulating lead.