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Production of stent precursors in the form of small-size tubes has been evaluated by hot compression tests and extrusion trials on the\ud 5 AZ31B and ZM21 magnesium alloys. The investigation here presented mainly reports on the effects of extrusion parameters on microstructure\ud and properties of the tubes. Processing at 410C and at slow strain rate (2.78 103 s1) by a laboratory hot-extrusion system allowed\ud producing small-size tubes featuring a homogeneous and refined equiaxed grain structure. Microstructural analyses showed that dynamic\ud recrystallization, often anticipated by deformation twinning, took place during hot forming. By a proper control of extrusion parameters,\ud tubes with wall thickness as low as 0.5mm could be successfully produced

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Biodegradable magnesium coronary stents: from the design to the realisation Biodegradable cardiovascular stents in magnesium alloys constitute a promising option for a less intrusive treatment, due to their high compatibility to the body tissue and intrinsic dissolution in body fluids. The design and fabrication aspect of this medical device requires an integrated approach considering different aspects such as mechanical properties, corrosion behaviour and biocompatibility.This work gathers and summarizes a multi-disciplinary work carried out by three different research teams for the design and fabrication of magnesium stents. In particular the paper discusses the design of the novel stent mesh, the deformability study of the magnesium alloys for tubular raw material, and laser microcutting for the realization of the stent mesh. Although the results are not fully validated and the device fully tested, they show the feasibility of the used approaches, as the first prototype stents in magnesium alloy were produced successfully.