Tank filters utilizing very low K materials, in series with lead wires or circuits of active medical devices to enhance MRI compatibility

A medical therapeutic device, comprising:

• an active medical device including electronic circuitry for therapy delivery or detection of biological signals, an electrode, and an electrical conductor for connecting the electrode to the electronic circuitry;
• and
• a tank filter comprising a low k substrate material, placed in series with the conductor and having electrical inductance in parallel with capacitance, whereby the tank filter attenuates current flow at a selected frequency band;
• wherein the tank filter comprises an inductor placed in parallel with a capacitor, wherein the capacitance and inductance values are selected such that the tank filter attenuates current flow at the selected frequency band;
• and
• wherein the tank filter comprises a tubular capacitor electrically connected to the electrode and the electrical conductor, and an inductor in parallel with the capacitor and electrically connected to the electrical conductor and the electrode.

A medical therapeutic device, comprising:

• an active medical device including electronic circuitry for therapy delivery or detection of biological signals, an electrode, and an electrical conductor for connecting the electrode to the electronic circuitry;
• and
• a tank filter comprising a low k substrate material, placed in series with the conductor and having electrical inductance in parallel with capacitance, whereby the tank filter attenuates current flow at a selected frequency band;
• wherein the tank filter comprises:
• a tubular capacitor electrically connected to the conductor and the electrode;
• an inductor comprising a spiral winding around a ferro-magnetic core disposed within the capacitor and electrically connected to the conductor and the electrode;
• and
• a sleeve disposed over the inductor for creating a ferro-magnetic field to reduce or prevent saturation of the inductor in the presence of a static magnetic field.

A medical therapeutic device, comprising:

• an active medical device including electronic circuitry for therapy delivery or detection of biological signals, an electrode, and an electrical conductor for connecting the electrode to the electronic circuitry;
• and
• a tank filter comprising a low k substrate material, placed in series with the conductor and having electrical inductance in parallel with capacitance, whereby the tank filter attenuates current flow at a selected frequency band;
• wherein the conductor comprises a coiled lead wire for connecting the electrode to the electronic circuitry, and wherein the tank filter comprises a chip capacitor comprised of a low k dielectric material, having wire bond pads disposed within, and electrically connected to, the coiled lead wire.

A medical therapeutic device, comprising:

• an active medical device including electronic circuitry for therapy delivery or detection of biological signals, an electrode, and an electrical conductor for connecting the electrode to the electronic circuitry;
• and
• a tank filter comprising a low k substrate material, placed in series with the conductor and having electrical inductance in parallel with capacitance, whereby the tank filter attenuates current flow at a selected frequency band;
• wherein the electrode comprises an active fixation distal TIP electrode having a spline electrically connected to the electrical conductor and extending within a housing having a coiled helix TIP therein, the tank filter being disposed within the housing and electrically connected to the spline and the coiled helix.

A medical therapeutic device, comprising:

• an active medical device including electronic circuitry for therapy delivery or detection of biological signals, an electrode, and an implantable lead for connecting the electrode to the electronic circuitry;
• and
• a tank filter comprising a low k material, placed in series with the lead and having electrical inductance in parallel with capacitance, whereby the tank filter attenuates current flow at a selected frequency band;
• wherein the tank filter comprises an inductor placed in parallel with a capacitor wherein the capacitance and inductance values are selected such that the tank filter attenuates current flow at the selected frequency band, the capacitor including first electrode plate extending to a first metallization surface, a second electrode plate extending to a second surface metallization, and a low K dielectric material disposed between the first and second electrode plates, and wherein the inductor is electrically connected to the first and second surface metallizations.