A medical lead includes a pitted, grooved or threaded electrode array tip
and a flexible tube or sheath encompassing the electrode array located
near the lead tip. In some embodiments, the electrode array adheres to
tissue, the tube or sheath adheres to the electrode array at the distal
end of the electrode array or the tube or sheath adheres to tissue at the
proximal end of the tube or sheath. Embodiments of the tube or sheath may
be made from biodegradable material and can include electrode windows
spaced along the tube or sheath corresponding to placement of electrode
contacts of the electrode array.