MRI COMPATIBLE ELECTRODE CIRCUIT
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 one electrode located on the elongate body; and
at least one electrical circuit in communication with said at least one electrode, said circuit housed within said elongate body and comprising one or more electrode wires, said one or more electrode wires forming at least one non-resonant filter and at least one resonant LC filter, said resonant LC filter positioned at the distal end of said elongate body proximate an electrode/wire interface.
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Accused Products
Abstract
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.
52 Citations
47 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 one electrode located on the elongate body; and at least one electrical circuit in communication with said at least one electrode, said circuit housed within said elongate body and comprising one or more electrode wires, said one or more electrode wires forming at least one non-resonant filter and at least one resonant LC filter, said resonant LC filter positioned at the distal end of said elongate body proximate an electrode/wire interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 40, 41, 44, 45, 46, 47)
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32. 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 first and second electrodes located on the elongate body; at least first and second electrode wires co-radially wound; at least first and second resonant LC filters formed from said at least first and second electrode wires and in electrical communication with said first and second electrodes, said resonant LC filters positioned at the distal end of said elongate body proximate an electrode/wire interface. - View Dependent Claims (33, 34, 42, 43)
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35. A method of constructing a lead assembly including two or more electrical circuits for use in implantable and non-implantable medical devices comprising:
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providing a first length of electrode wire to form a first electrical circuit; helically winding said electrode wire over a length of flexible tubing from a first end of said circuit to a second end of said circuit; forming a plurality of non-resonant filters from said electrode wire in a spaced apart relationship along said flexible tubing; forming a most proximal first resonant LC filter; providing a second length of electrode wire to form a second electrical circuit; helically winding said second length of electrode wire over said length of flexible tubing from a first end of said circuit to a second end of said circuit; forming a plurality of non-resonant filters from said second length of electrode wire in a spaced apart relationship along said flexible tubing further helically winding said second electrode wire such that said wire passes over said most proximal resonant LC filter; and forming a second proximal resonant LC filter distal to said most proximal first resonant LC filter. - View Dependent Claims (36, 37, 38, 39)
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Specification