An apparatus comprising: an elongated member having a proximal end and a distal end； a conduit disposed within the elongated member； an exit port disposed on an outer surface of the elongated member in fluidic communication with the conduit； and at least one threaded fixation structure extending around a portion of an outer surface of the elongated member and configured to engage tissue within a patient to resist migration of the medical lead, wherein the conduit is configured to deliver a therapeutic agent to the patient via the exit port.
