MRI compatible electrode circuit

摘要

An MRI compatible electrode circuit 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 at or near an electrode/wire interface 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 one or more non-resonant filter(s) positioned along the length of the electrode wire that 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. The non-resonant filter(s) may also attenuate the RF current reflected from the resonant LC filter thereby resolving the issue of the strong reflected power from the resonant filter and the associated dielectric heating.

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; a plurality of electrodes located on the elongate body; and a plurality of electrode circuits each of which is in communication with a respective one of said plurality of electrodes, said plurality of electrode circuits housed within said elongate body and each comprising one or more electrode wires, said one or more electrode wires forming one or more non-resonant filters and one or more resonant LC filters.