A biocompatible material may be configured into any number of implantable medical devices including intraluminal stents. The estimated present position calculated by the second estimation calculations is determined to be a present position candidate corresponding to the target satellite set. The drug containment unit also comprises at least one sensor and control logic. The shank receiving stepped portion has a stepped portion edge boundary with the small diameter portion. The plasma expands both hydraulically and adiabatically and exerts an expansive force against one of the vanes.