LEAD CONSTRUCTION WITH COMPOSITE MATERIAL SHIELD LAYER

摘要

A lead construction includes a lead body, an electrically conductive element disposed therein, and a shield layer disposed over the conductive element formed from a composite material comprising a polymer material and a non-ferrous particulate material. The non-ferrous material can include gold, platinum, iridium, nickel, cobalt, chromium, molybdenum, carbon/graphite powders, and alloys thereof. The composite material has a non-ferrous particulate content of from about 40 to 90 volume percent, and the shield layer has a thickness of from about 0.1 to 1 mm. The composite material forms an electrically conductive layer when exposed to RF having a frequency of greater than about 64 MHz. A layer of insulating material may be interposed between the shield layer and the conductive element. The shield layer can be part of the lead body, can be an intermediate layer within the lead body, or can be an outer surface of the lead body.