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At sites of serious constriction of the coronary blood vessels (stenoses), a stent is almost always implanted. In this case, we are talking about a thin wire mesh about 1 to 2 cm in length and with a diameter between 2.5 and 4 mm. After the diagnostic cardiac catheterization, we often look for the constricted coronary vessel in question again with a somewhat larger cardiac catheter. A thin wire is carefully inserted through the stenosis into the vascular section behind it. The wire serves as a track for the stent balloon, so that the balloon glides along the wire right to the site of the constriction. There the balloon is pumped up with high pressure of usually at least 10 bar. In case of drastic constriction, a balloon dilatation is needed before a stent can be inserted.