A cardiac pacing lead or other stimulation lead carrying a drug incorporated into a controlled release device. The lead is provided with an extendable fixation helix which is advanceable from the distal end of the lead in order to engage with the tissue to be stimulated and to maintain the distal end...http://www.google.de/patents/US4953564?utm_source=gb-gplus-sharePatent US4953564 - Screw-in drug eluting lead
