| CPC H01F 7/1607 (2013.01) [A61N 2/02 (2013.01)] | 20 Claims |
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1. An elongate structure for generating or detecting electrical and/or magnetic signals or fields, said structure having separate spaced apart ends, comprising;
a primary helical winding including a primary thread wrapped helically around a primary core; said primary thread being electrically conductive and said primary core having a high magnetically permeability, and
an additional helical winding forming a secondary helical winding wherein the secondary helical winding is formed by the primary helical winding wrapped helically around a secondary core, wherein the secondary core is electrically conductive and the ends of the secondary core are electrically connected.
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