MRI and RF compatible leads and related methods of operating and fabricating leads
First Claim
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1. A flexible medical lead, comprising:
- an elongate flexible lead body of a biocompatible polymer material, the lead body having a length with a proximal end portion and a distal end portion;
a plurality of electrodes disposed along the distal end portion of the lead body;
a plurality of contacts disposed along the proximal end portion of the lead body; and
at least one conductor, wherein each of the at least one conductor is continuous and is electrically coupled to at least one of the electrodes and at least one of the contacts and comprises a plurality of segments, each segment comprising a multi-layer stacked coil configuration, each multi-layer stacked coil configuration comprising a first forward coiled section that extends in a forward lengthwise direction, then turns back into a reverse coiled section that extends in a substantially opposing reverse lengthwise direction, then turns back into a second forward coiled section that extends in the forward lengthwise direction, wherein the first forward coiled section, reverse coiled section, and second forward coiled section form a plurality of layers stacked over each other.
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Abstract
RF/MRI compatible leads include at least one conductor that turns back on itself at least twice in a lengthwise direction, and can turn back on itself at least twice at multiple locations along its length. The at least one electrical lead can be configured so that the lead heats local tissue less than about 10 degrees Celsius (typically about 5 degrees Celsius or less) or does not heat local tissue when a patient is exposed to target RF frequencies at a peak input SAR of at least about 4 W/kg and/or a whole body average SAR of at least about 2 W/kg. Related devices and methods of fabricating leads are also described.
186 Citations
20 Claims
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1. A flexible medical lead, comprising:
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an elongate flexible lead body of a biocompatible polymer material, the lead body having a length with a proximal end portion and a distal end portion; a plurality of electrodes disposed along the distal end portion of the lead body; a plurality of contacts disposed along the proximal end portion of the lead body; and at least one conductor, wherein each of the at least one conductor is continuous and is electrically coupled to at least one of the electrodes and at least one of the contacts and comprises a plurality of segments, each segment comprising a multi-layer stacked coil configuration, each multi-layer stacked coil configuration comprising a first forward coiled section that extends in a forward lengthwise direction, then turns back into a reverse coiled section that extends in a substantially opposing reverse lengthwise direction, then turns back into a second forward coiled section that extends in the forward lengthwise direction, wherein the first forward coiled section, reverse coiled section, and second forward coiled section form a plurality of layers stacked over each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification