MRI compatible co-radially wound lead assembly
First Claim
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 a first electrode and at least a second electrode located on the elongate body;
at least a first length of electrode wire and at least a second length of electrode wire co-radially wound within said elongate body;
a first resonant LC filter formed from said at least a first length of electrode wire, said first resonant LC filter stacked physically in a plurality of layers and a second resonant LC filter formed from said at least a second length of electrode wire, said second resonant LC filter stacked physically in a plurality of layers, said at least a first length of electrode wire in electrical communication with said first electrode and said at least a second length of electrode wire in electrical communication with said second electrode, said first resonant LC filter positioned proximate said first electrode and said second resonant LC filter positioned proximate said second electrode,wherein said co-radially wound first and second electrode wires form a non-resonant filter having a substantially uniformly distributed inductance along the length of said non-resonant filter.
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Accused Products
Abstract
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 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.
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Citations
21 Claims
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1. A lead assembly comprising:
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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 a first electrode and at least a second electrode located on the elongate body; at least a first length of electrode wire and at least a second length of electrode wire co-radially wound within said elongate body; a first resonant LC filter formed from said at least a first length of electrode wire, said first resonant LC filter stacked physically in a plurality of layers and a second resonant LC filter formed from said at least a second length of electrode wire, said second resonant LC filter stacked physically in a plurality of layers, said at least a first length of electrode wire in electrical communication with said first electrode and said at least a second length of electrode wire in electrical communication with said second electrode, said first resonant LC filter positioned proximate said first electrode and said second resonant LC filter positioned proximate said second electrode, wherein said co-radially wound first and second electrode wires form a non-resonant filter having a substantially uniformly distributed inductance along the length of said non-resonant filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification