ELECTRICAL LEAD ASSEMBLIES FOR MRI-COMPATIBLE MEDICAL DEVICES AND MRI-COMPATIBLE MEDICAL DEVICES INCORPORATING SAME

摘要

An elongate electrical lead assembly that reduces localized heating due to MR scanner-induced currents includes a first elongate electrical lead having a series of alternating single layer coil sections and multi-layer coil sections, a second elongate electrical lead having a series of alternating single layer coil sections and multi-layer coil sections, and a third elongate electrical lead having a coiled section that coaxially surrounds the first and second electrical leads. Each multi-layer coil section of the second electrical lead is coiled around a respective single layer coil section of the first electrical lead, and each single layer coil section of the second electrical lead is coiled around a respective multi-layer coil section of the first electrical lead.

主权项

1. An elongate electrical lead subassembly, comprising:
at least one first conductor comprising a series of alternating single layer coil sections and multi-layer coil sections and attached at one end portion to an ablation electrode; and at least one second conductor comprising a series of alternating single layer coil sections and multi-layer coil sections and attached at one end portion to a sensing electrode upstream of the ablation electrode; wherein each multi-layer coil section of the at least one second conductor is coiled around a respective single layer coil section of the at least one first conductor, and wherein each single layer coil section of the at least one second conductor is coiled around a respective multi-layer coil section of the at least one first conductor such that the electrical lead assembly has a substantially constant diameter along at least a portion of its length.