Patent ID: 8612021

Claim:
A method comprising: obtaining an electrical conductor having a conductive core, a first insulation layer surrounding the conductive core, and a second insulation layer surrounding the first insulation layer, wherein the second insulation layer has a thermal property that occurs at a lower temperature than the same thermal property of the first insulation layer; winding the electrical conductor to form an RF filter having a resonant frequency that presents a high impedance at frequencies of RF signals generated by a magnetic resonance imaging (MRI) device and presents a low impedance at frequencies associated with electrical stimulation therapies, the RF filter having a plurality of rows of windings including an innermost row and an outermost row, each subsequent row of windings from the innermost row to the outermost row being wound over the previously wound row; and heating at least a portion of the RF filter to a temperature at or above the thermal property of the second insulation layer and below the thermal property of the first insulation layer such that the second insulation layers of adjacent windings of the electrical conductor bond throughout at least the portion of the RF filter.