An implant system delivers bone morphogenic protein and other substances to the human body. The outer wire has a sinuous shaped portion at a distal region. The method consists of forming isolation trenches in a composite strained-SiSiGe substrate and growing a liner oxide by wet oxidation such that oxidation is selective to SiGe only, with negligible oxidation of silicon surfaces. The first coupling element is pivotably connected to the tongue or the tractor vehicle such as to be pivotable about a horizontal pivot shaft.