Medical device with an electrically conductive anti-antenna member
View Patent ↗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.
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.