A stent is a small mesh tube that holds open passages in the body, such as weak or narrow arteries. The stent restores the flow of blood or other bodily fluids. Stents are also sometimes used to treat the aorta if it has an aneurysm or bulge in it. Stents can also be used in the carotid arteries in the neck to prevent or treat stroke, or sometimes to treat narrowed airways in the lungs.
Stents can be made of metal mesh, fabric, silicone, or combinations of materials. Stents used for coronary arteries have a base of metal mesh. Fabric stents, also called stent grafts, are used in larger arteries such as the aorta. Stents used in the airways of the lungs are often made of silicone.
As a life-saving device, accuracy in engineering and production of stents are crucial. The mesh pattern of a stent is often created using etching or high-precision laser cutting, so measuring the accuracy of the cuts and identifying any protruding burs or nicks that could damage the patient and result in failure in services is important, therefore it is needed to perform quality control tests and verify function of the stents. One of the methods to verify any defect and fracture is X-ray micro-CT imaging; a non-destructive imaging tool for the production of high-resolution three-dimensional (3D) images of a sample.
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Some parts of the text are taken from: https://www.nhlbi.nih.gov/health-topics/stents