Patent ID: 8868213

Claim:
A lead for sensing / pacing for implantation in venous, arterial or lymphatic networks, comprising a proximal end and a distal end, said distal end comprising an active part including a microcable having a diameter of at most equal to 2 French (0.66mm), said microcable comprising: an electrically conductive core cable having a diameter of at most equal to 0.50 mm, said core cable comprising a plurality of strands each having a diameter of at most equal to 40μm, said core cable comprising a structuring material having a high fatigue strength, and; an polymer insulation layer at least partially surrounding the core cable and having a thickness of at most equal to 30% of the diameter of the core cable, wherein: the core cable of the microcable comprises a composite structure formed from at least (i) said structuring material and (i) a radiopaque material constituting at least about 0.008mm 2 of the core cable section cross section in an amount of at most 50%, wherein the conductive core cable is comprised of multiple strands in which individual a first set of strands are formed from the structuring material and a second set of strands are formed from the radiopaque material, and at least one denuded area is formed in the insulation layer so as to form at least one electrode having a cumulative total surface areas of at most 20mm 2 ; and means for gradually reducing a rigidity along the lead between its proximal end portion and its distal end.