MRI compatible co-radially wound lead assembly

摘要

An MRI compatible lead assembly construct is provided. The construct includes at least two filter components constructed from an electrode wire. One filter component may be a resonant LC filter proximate an electrode that resolves the issue of insufficient attenuation by effectively blocking the RF induced current on the wire from exiting the wire through the electrode. The second filter component may include a non-resonant filter(s) positioned along the length of the electrode wire by co-radially winding at least two electrode wires. The non-resonant filter resolve(s) the issue of excessive heating of the resonant LC filter by significantly attenuating the current induced on the wire before it reaches the resonant LC filter.

主权项

1. A lead assembly comprising:
an elongate body having a proximal end and a distal end, said elongate body defining a lumen therewithin, the distal end arranged and configured to contact tissue and the proximal end operably coupled to an electronic control; at least one electrode circuit positioned within said elongate body, said electrode circuit including a plurality of electrodes located on the elongate body; a plurality of first electrode wires co-radially wound within said elongate body, said plurality of co-radially wound electrode wires forming a single, first non-resonant filter having a substantially uniformly distributed inductance along the length of said first non-resonant filter; and a plurality of first resonant LC filters, each formed from one of said plurality of first co-radially wound electrode wires, said resonant LC filters stacked physically in a plurality of layers, wherein said plurality of electrode wires are in electrical communication with said plurality of electrodes.