Tank filters adaptable for placement with a guide wire, in series with the lead wires or circuits of active medical devices to enhance MRI compatibility

A medical therapeutic device, comprising:

• a tank filter placed in series with a 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 an electrode;
• an inductor electrically connected to the conductor and the electrode, the inductor comprising a spiral winding around a ferro-magnetic core disposed within the capacitor;
• a sleeve disposed over the inductor for creating a ferro-magnetic field to reduce or prevent saturation of inductor in presence of a static magnetic field;
• and
• a passageway permitting selective slidable passage of a guide wire therethrough.

A medical device, comprising:

• an active medical device (AMD);
• a probe or catheter extending from the AMD and having a TIP, RING or PAD electrode;
• a passageway extending through the probe or catheter, permitting slidable passage of a guide wire therethrough;
• and
• a band stop filter associated with the catheter or probe electrodes, for attenuating current flow through the probe or catheter at a selected frequency, wherein the band stop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with the probe or catheter electrode, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at the selected frequency, wherein the overall Q of the band stop filter is reduced to attenuate current flow through the lead wire along a range of selected frequencies.