Electrically conductive and mechanically supportive polymer materials for biomedical leads

An implantable medical lead comprising:

• a conducting electrode comprising:
• a proximal end;
• a distal end;
• a conductive polymer connected to provide an electrically conductive path from the proximal end to the distal end;
• an insulating sheath surrounding the conductive polymer to electrically insulate a surface of the conductive polymer;
• a second conducting electrode comprising a second conductive polymer positioned along the insulating sheath;
• a second insulating sheath surrounding the second conductive polymer to electrically insulate a surface of the second conductive polymer,
• wherein either:
• (a) the conductive polymer penetrates the insulating sheath to a depth that is equal to or less than the wall thickness of the insulating sheath;
• (b) the conductive polymer penetrates a length equal to or less than a total length of the insulating sheath;
• or (c) the conductive polymer penetrates a surface area equal to or less than a total surface area of the insulating sheath.