An electrode lead is provided having a distal side and a circumferential surface, the electrode lead comprising a plurality of interlocked filaments having a conductive core coated with a nonconductive coating and at least one 3D distinct conductive mass at the distal end, wherein the filaments in the conductive mass are having an exposed conductive core and wherein a portion of the filaments with the exposed conductive core are disposed on the circumferential surface. The 3d pattern of spaced-apart regions along or within the electrode lead, each one is a network of spaced-apart conductive segments determining together critical parameters of: directionality of the region and electrical property of the region.