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The concertina barrier-like vascular support (usually made of high grade steel) is introduced to the arterial vessels following balloon dilatation, to reduce the frequency of renewed vascular stenosis. The stents are then coated with medication, which have their own therapeutic effects. In cardiology, they are predominantly introduced into the coronary artery but can also be used in arteries of the lower limb and cerebral arteries.Categorization of stents

• Bare metal stent: simple metal stent
• Drug eluting stent: stent releasing medication

Stents which release medication are also coated with a pharmacon, which counteracts any restenosis, i.e. any renewed vascular occlusion e.g. because of some endothelial proliferation.How is the stent implanted?In the case of a stenosis requiring treatment or following an angioplasty, a stent is advanced by means of a balloon catheter to the constricted vascular section and is unfolded there. Thus it stabilizes the vessels in the affected place. A stent in the coronary artery is frequently described as a coronary endoprosthesis.How does a stent work? A stent (vascular support) is introduced by stent implantation into consticted or blocked vessels in the body e.g. into the coronary arteries or the cerebral arteries. The stent material pressed against the vascular wall is overgrown by the endothelium (so-called endothelialization) and keeps the vessel open.Weblinksbilddatenbank.medicalpicture.de