Medical device with an electrically conductive anti-antenna member

• US 8,868,212 B2
• Filed: 08/30/2005
• Issued: 10/21/2014
• Est. Priority Date: 08/25/2003
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Gray, Robert W.
• Primary Examiner(s): Bertram, Eric D.
• Application Number:
  US11/214,620
• Publication Number:
  US 20050283168A1
• Time in Patent Office: 3,339 Days
• Field of Search: 607/119
• US Class Current: 607/119
• CPC Class Codes: A61B 2090/0481 against EM radiation, e.g. microwave
• CPC Class Codes: A61B 2090/374 NMR or MRI
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• 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: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2210/009 magnetic
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/124 of other specific inorganic materials not covered by A61L31/122 or A61L31/123
• CPC Class Codes: A61L 31/18 Materials at least partially X-ray or laser opaque
• CPC Class Codes: A61N 1/056 Transvascular endocardial electrode systems
• CPC Class Codes: A61N 1/37 Monitoring; Protecting
• CPC Class Codes: A61N 2/00 Magnetotherapy
• CPC Class Codes: G01R 33/285 Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR

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. An implantable adapter for coupling an implantable lead to an implantable medical device, the adapter comprising:

a housing of the implantable adapter configured at a first end to form a first mechanical connector to provide a reversible mechanical connection to a proximal end of the implantable lead and configured at a second end to form a second mechanical connector to provide a reversible mechanical connection to the implantable medical device, wherein the implantable medical device comprises an implantable medical device housing separate from the housing of the implantable adapter;

a first resonant circuit within the housing of the implantable adapter, the first resonant circuit having a resonance frequency approximately equal to a frequency of a first electromagnetic radiation source;

a second resonant circuit within the housing of the implantable adapter and connected in series with the first resonant circuit, the second resonant circuit having a resonance frequency approximately equal to a frequency of a second electromagnetic radiation source;

a first wire within the housing of the implantable adapter to electrically connect a first wire of the implantable lead to the first resonant circuit; and

a second wire within the housing of the implantable adapter to electrically connect the second resonant circuit to the implantable medical device.

2. The implantable adapter as claimed in claim 1, wherein said first resonant circuit is an inductor connected in parallel with a capacitor.

3. The implantable adapter of claim 1, wherein said first resonant circuit is an inductor connected in parallel with a capacitor and a resistor, said resistor and capacitor being connected in series.

4. The implantable adapter as claimed in claim 1, further comprising:

a heat dissipating structure;

said heat dissipating structure being located adjacent to said first resonant circuit;

said heat dissipating structure dissipating the heat generated by said first resonant circuit.

5. The implantable adapter as claimed in claim 1, wherein said second resonant circuit is an inductor connected in parallel with a capacitor.

6. The implantable adapter of claim 1, wherein said second resonant circuit is an inductor connected in parallel with a capacitor and a resistor, said resistor and capacitor being connected in series.

7. The implantable adapter as claimed in claim 1, further comprising:

a heat dissipating structure;

said heat dissipating structure being located adjacent to said second resonant circuit;

said heat dissipating structure dissipating the heat generated by said second resonant circuit.

8. The adapter of claim 1, wherein the first mechanical connector comprises a female connector and the second mechanical connector comprises a male connector.

9. The adapter of claim 1, further comprising a third wire within the housing of the adapter that electrically connects a second wire of the implantable lead to the implantable medical device.

10. An adapter for coupling an implantable lead to an implantable medical device, the adapter comprising:

a housing of the adapter configured at a first end to form a first mechanical connector to provide a reversible mechanical connection to a proximal end of the implantable lead and configured at a second end to form a second mechanical connector to provide a reversible mechanical connection to the implantable medical device, wherein the implantable medical device comprises an implantable medical device housing separate from the housing of the implantable adapter;

a first resonant circuit within the housing of the adapter, the first resonant circuit having a resonance frequency approximately equal to a frequency of an electromagnetic radiation source;

a second resonant circuit within the housing of the adapter, the second resonant circuit having a resonance frequency approximately equal to the frequency of the electromagnetic radiation source;

a first wire within the housing of the adapter to electrically connect a first wire of the implantable lead to the first resonant circuit; and

a second wire within the housing of the adapter to electrically connect the first resonant circuit to the implantable medical device;

a third wire within the housing of the adapter to electrically connect a second wire of the implantable lead to the second resonant circuit; and

a fourth wire within the housing of the adapter to electrically connect the second resonant circuit to the implantable medical device.

11. The adapter of claim 10, further comprising a third resonant circuit within the housing of the adapter, wherein the third resonant circuit is connected in series with the first resonant circuit, the third resonant circuit having a resonance frequency approximately equal to a frequency of a second electromagnetic source that is different than the frequency of the first electromagnetic source.

12. The adapter of claim 10, wherein at least one of the said first resonant circuit and said second resonant circuit is an inductor connected in parallel with a capacitor.

13. The adapter of claim 10, wherein at least one of the said first resonant circuit and said second resonant circuit is an inductor connected in parallel with a capacitor and a resistor, said resistor and capacitor being connected in series.

14. The adapter of claim 10, further comprising a heat dissipating structure, said heat dissipating structure being located adjacent to the first resonant circuit and dissipating heat generated by the first resonant circuit.

15. The adapter of claim 14, wherein the heat dissipating structure includes one or more cooling fins.

16. The adapter of claim 10, wherein the first connector comprises a female mechanical connector and the second mechanical connector comprises a male connector.

17. An implantable medical system comprising:

an implantable medical device having a female connector, wherein the implantable medical device comprises an implantable medical device housing;

an implantable medical lead having a male connector; and

an adapter for electrically coupling the implantable medical lead to the implantable medical device, the adapter comprising;

a housing of the adapter configured at a first end to form a female connector to provide a reversible mechanical connection to the male connector of the implantable medical lead and configured at a second end to form a male connector to provide a reversible mechanical connection to the female connector of the implantable medical device, wherein the housing of the adapter is separate from the implantable medical device housing;

a first resonant circuit within the housing of the adapter, the first resonant circuit having a resonance frequency approximately equal to a frequency of a first electromagnetic radiation source;

a second resonant circuit within the housing of the adapter and in series with the first resonant circuit, the second resonant circuit having a resonance frequency approximately equal to a frequency of a second electromagnetic radiation source;

a first wire within the housing of the adapter to electrically connect a first wire of the implantable lead to the first resonant circuit; and

a second wire within the housing of the adapter to electrically connect the second resonant circuit to the implantable medical device.

18. The adapter of claim 17, further comprising a third wire within the housing of the adapter that electrically connects a second wire of the implantable lead to the implantable medical device.