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Magnesium alloy stents
Magnesium alloy stents can be placed inside blood vessels for the treatment of heart disease and arteriosclerosis. Compared to other materials such as stainless steel and cobalt-chromium alloys, magnesium alloy stents have better biocompatibility and biodegradability, which can reduce the risk of postoperative complications for patients undergoing heart surgery.
The manufacturing of magnesium alloy stents requires the use of highly pure magnesium alloy materials and precise processing techniques to ensure that the size and shape of the stents meet specifications. In addition, the surface of magnesium alloy stents can be specially treated to improve their corrosion resistance and mechanical strength.
Common surface treatments include:
Phosphatization: forming a layer of phosphate ceramic coating on the surface of the magnesium alloy stent to improve its corrosion resistance and reduce its biological toxicity.
Oxidation: allowing the magnesium alloy stent to naturally oxidize in air or using methods such as thermal oxidation to form an oxide film, thereby increasing its corrosion resistance and biocompatibility.
Bioactive coating: applying calcium phosphate compounds, hydroxyapatite, etc., to the surface of the magnesium alloy stent to promote tissue bonding and bone regeneration.
Modified polymer coating: applying modified polylactic acid and other materials to the surface of the magnesium alloy stent to improve its biocompatibility and cell adhesion.
The specifications of magnesium alloy stents implanted in the human body typically include a diameter of 2-12mm, length of 10-50mm, and wall thickness of 0.2-2mm.
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