Nitinol is a shape-memory superelastic alloy widely used for various kinds of surgery. In particular, nitinol is one of the best materials for the production of intracoronary and brain arterial stents. The reliability of such a stent is a matter of life for a patient, because malfunctions of almost any kind may result in lethal damages. Although nitinol is chemically quite passive, a stent has to pertain good mechanical stability for many years, desirable many dozens of years. Another problem presenting a potential risk is nickel, whose corrosion may produce toxic substances. Wires of which a stent is produced are in dynamic stress so that the issue of fretting corrosion is especially important.