Certain novel N-acylated piperidine derivatives are agonists of the human melanocortin receptor and, in particular, are selective agonists of the human melanocortin-4 receptor. Such memory devices are formed by forming a tip protruding from a lower surface of a lower electrode element. The support projections receive and support connecting terminals and have projecting dimensions corresponding to the connecting terminals. The branches have a curvature enabling the branches to substantially surround the plurality of struts while at the same time avoiding contact with the wall of the blood vessel of the patient when the medical device is deployed. Thus, if the map information is unwritable, alterations to the map information can be made to it by means of editing information so that the user can be provided with appropriate guidance. Said tubular device is directionally bendable at the distal end by selective negative changes in pressure in said distal end.