Methods and apparatus for fabricating leads with conductors and related flexible
First Claim
Patent Images
1. An RF/MRI compatible lead having a proximal end and a distal end, the lead comprising:
- an outer layer of a biocompatible, non-conductive polymer material extending along a portion of the lead;
at least one electrode disposed along the distal end of the lead;
at least one insulated conductor extending along the lead and electrically coupled to the at least one electrode, each of the at least one insulated conductor having a length with opposing distal and proximal end portions, each of the at least one insulated conductor having at least one segment with a multi-layer coil configuration, each multi-layer coil configuration being covered by the outer layer of the biocompatible, non-conductive polymer material and being formed from a single one of the at least one insulated conductor and comprising a first forward coiled section that extends in a forward lengthwise direction for a first forward physical length, then turns to merge into a proximately positioned reverse coiled section that extends in a substantially opposing reverse lengthwise direction for a reverse physical length, then turns to merge into a proximately positioned second forward coiled section that extends in the forward lengthwise direction for a second forward physical length, wherein the first forward coiled section, reverse coiled section, and second forward coiled section of the multi-layer coil configuration are each part of the single one of the at least one insulated conductor,wherein the lead is flexible and is configured and arranged for insertion into a body of a patient.
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Abstract
MRI/RF compatible leads include at least one conductor, a respective conductor having at least one segment with a multi-layer stacked coil configuration. The 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 leads and methods of fabricating leads are also described.
189 Citations
39 Claims
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1. An RF/MRI compatible lead having a proximal end and a distal end, the lead comprising:
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an outer layer of a biocompatible, non-conductive polymer material extending along a portion of the lead; at least one electrode disposed along the distal end of the lead; at least one insulated conductor extending along the lead and electrically coupled to the at least one electrode, each of the at least one insulated conductor having a length with opposing distal and proximal end portions, each of the at least one insulated conductor having at least one segment with a multi-layer coil configuration, each multi-layer coil configuration being covered by the outer layer of the biocompatible, non-conductive polymer material and being formed from a single one of the at least one insulated conductor and comprising a first forward coiled section that extends in a forward lengthwise direction for a first forward physical length, then turns to merge into a proximately positioned reverse coiled section that extends in a substantially opposing reverse lengthwise direction for a reverse physical length, then turns to merge into a proximately positioned second forward coiled section that extends in the forward lengthwise direction for a second forward physical length, wherein the first forward coiled section, reverse coiled section, and second forward coiled section of the multi-layer coil configuration are each part of the single one of the at least one insulated conductor, wherein the lead is flexible and is configured and arranged for insertion into a body of a patient. - 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, 32, 33)
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34. An RF/MRI compatible lead comprising:
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a plurality of conductors, each of the plurality of conductors having a length with opposing distal and proximal end portions, each of the plurality of conductors having at least one segment with a multi-layer coil configuration, each multi-layer coil configuration being formed from a single one of the plurality of conductors and comprising a first forward coiled section that extends in a forward lengthwise direction for a first forward physical length, then turns to merge into a proximately positioned reverse coiled section that extends in a substantially opposing reverse lengthwise direction for a reverse physical length, then turns to merge into a proximately positioned second forward coiled section that extends in the forward lengthwise direction for a second forward physical length, wherein the first forward coiled section, reverse coiled section, and second forward coiled section of the multi-layer coil configuration are each part of the single one of the plurality of conductors; and at least one electrode with one or more of the plurality of conductors in communication with the at least one electrode, wherein the lead is configured so that the lead heats local tissue less than about 10 degrees Celsius or does not heat local tissue when a patient is exposed to target RF frequencies generating a peak input SAR of between about 4 W/kg to about 10 W/kg and/or whole body average SAR of between about 2 W/kg to about 4 W/kg.
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35. An RF/MRI compatible lead comprising:
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a plurality of conductors, each of the plurality of conductors having a length with opposing distal and proximal end portions, each of the plurality of conductors having at least one segment with a multi-layer coil configuration, each multi-layer coil configuration being formed from a single one of the plurality of conductors and comprising a first forward coiled section that extends in a forward lengthwise direction for a first forward physical length, then turns to merge into a proximately positioned reverse coiled section that extends in a substantially opposing reverse lengthwise direction for a reverse physical length, then turns to merge into a proximately positioned second forward coiled section that extends in the forward lengthwise direction for a second forward physical length, wherein the first forward coiled section, reverse coiled section, and second forward coiled section of the multi-layer coil configuration are each part of the single one of the plurality of conductors; and at least one electrode with one or more of the plurality of conductors in communication with the at least one electrode, wherein the electrical lead heats local tissue less than about 5 degrees Celsius when exposed to target RF frequencies associated with MR Scanners at a peak input SAR of between about 4-10 W/kg and/or a whole body average SAR of between about 2-5 W/kg.
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36. A medical lead having a proximal end and a distal end, the medical lead comprising:
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an outer layer of a biocompatible, non-conductive polymer material extending along a portion of the lead; at least one electrode disposed along the distal end of the lead; and at least first and second insulated conductors extending along the lead and electrically coupled to the at least one electrode, the first and second conductors having at least one multi-layer stacked cowound coil configuration, wherein, for each multi-layer stacked cowound coil configuration, each of the first and second conductors, including the at least one multi-layer stacked cowound coil configuration, being covered by the outer layer of the biocompatible, non-conductive polymer material and having individually a first forward coiled section that extends in a forward lengthwise direction for a first forward physical length, that then turns in a lengthwise direction to merge into a proximately positioned reverse coiled section that extends in a substantially opposing reverse lengthwise direction for a reverse physical length, and that then turns in the lengthwise direction to merge into a proximately positioned second forward coiled section that extends in the forward lengthwise direction, wherein the medical lead is flexible and is configured and arranged for insertion into a body of a patient. - View Dependent Claims (37, 38, 39)
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Specification