Construction of an MRI-safe tachycardia lead
First Claim
1. A medical device lead comprising:
- an insulating tubular member having a proximal end, a distal end, and a lumen extending therebetween;
an electrical conductor extending within the lumen from the proximal end toward the distal end; and
a tubular conductive element disposed over the insulating tubular member and between the proximal end and the distal end, wherein the tubular conductive element is electrically coupled to the electrical conductor and has one or more kerfs formed in it to affect an electrical property of the tubular conductive element, wherein the one or more kerfs include kerfs formed in a helical pattern such that electrical current passing through the tubular conductive element travels along a helical path and the kerfs formed in the helical pattern have a variable pitch.
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Abstract
A medical device lead includes a tubular conductive element disposed over a lead body. The tubular conductive element includes at least one segment having one or more kerfs formed radially therethrough in a predetermined configuration so as to affect at least one electrical property, e.g., electrical impedance, of the segment. The segment may form a shocking conductor of the medical device lead. The tubular conductive element may alternatively include proximal, intermediate and distal segments each having one or more kerfs formed radially therethrough, where the one or more kerfs in each of the proximal and intermediate segments are configured so that these segments each have a higher electrical impedance than the distal segment. A layer of insulative material is disposed over the proximal and intermediate segments, so that the proximal and intermediate segments of the tubular conductive element are operable to filter electromagnetic energy from an external source.
390 Citations
16 Claims
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1. A medical device lead comprising:
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an insulating tubular member having a proximal end, a distal end, and a lumen extending therebetween; an electrical conductor extending within the lumen from the proximal end toward the distal end; and a tubular conductive element disposed over the insulating tubular member and between the proximal end and the distal end, wherein the tubular conductive element is electrically coupled to the electrical conductor and has one or more kerfs formed in it to affect an electrical property of the tubular conductive element, wherein the one or more kerfs include kerfs formed in a helical pattern such that electrical current passing through the tubular conductive element travels along a helical path and the kerfs formed in the helical pattern have a variable pitch. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A medical device lead comprising:
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an insulating tubular member having a proximal end, a distal end, and a lumen extending therebetween; an electrical conductor extending within the lumen from the proximal end toward the distal end; and a tubular conductive element disposed over the insulating tubular member and between the proximal end and the distal end, wherein the tubular conductive element is electrically coupled to the electrical conductor and has a first segment with first kerfs formed in it and a second segment extending distally from the first segment and with second kerfs formed in it, wherein the first kerfs are different than the second kerfs, and wherein the first kerfs and the second kerfs are configured to provide a higher electrical impedance in the first segment as compared to the second segment. - View Dependent Claims (8, 9, 10, 11)
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12. An electrode component for an implantable medical device lead, the electrode component comprising:
a tubular conductive element including a first segment, a second segment extending distally from the first segment, and a third segment extending distally from the second segment, wherein one or more kerfs are formed in each of the first segment, the second segment, and the third segment such that the first segment and the second segment have a higher electrical impedance than the third segment. - View Dependent Claims (13, 14, 15, 16)
Specification