ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Coronary stent. This stent (wire mesh tube at centre) is used to treat stenosis (narrowing) of the coronary arteries. The procedure used to insert the stent into the artery is referred to as an angioplasty, where a balloon catheter (seen running from left to right) guides the stent inside the artery. A region of the catheter is then inflated in order to expand the stent. When the catheter is deflated and removed, the stent retains its expanded shape, keeping the artery open to ensure normal blood flow.
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