The global market value of orthopaedic equipment is estimated to grow from $26.3 billion in 2012 to $38.1 billion in 2019, with an average annual growth rate of 5.7%. The global spine product market is expected to grow from 6.45 billion US dollars in 2012 to 10.65 billion US dollars in 2019, with an average compound annual growth rate of 8.1%. There are about 40 million fracture patients in China every year, and the annual demand for metal internal fixation materials exceeds 3 million. Fractures occur every three seconds worldwide. (Data source: Kalorama Information 2015/Metal Center MII collation) Medical metal materials are widely used in clinic because of their high strength, good toughness, bending fatigue strength and excellent processing and forming properties. Traditional medical metal materials, such as 316L stainless steel, Co-Cr alloy, titanium and titanium alloy, are all bioinert materials. They can not degrade by themselves after implantation into human body. They need to be removed by second operation, which increases the pain of patients and the burden of medical expenses. Biotoxic metal ions and particles formed by wear or corrosion of these inert materials in vivo can cause allergic or inflammatory reactions in surrounding tissues and reduce the biocompatibility of materials. Therefore, based on the above, it is imperative to develop biodegradable medical magnesium metal materials.

The main drawback of traditional magnesium bone nail is that "the degradation speed is too fast". Before the bone hyperplasia, the magnesium bone nail has been degraded and ablated. Since 2014, Taiwan Guangyu Technology Co., Ltd. has cooperated with the Taiwan metal center to carry out experiments. It uses high-purity magnesium materials to manufacture non-toxic magnesium bone nails and "encapsulates biodegradable polymer materials" to slow down the rapid degradation rate of traditional magnesium bone nails, and has successively obtained invention and utility model patents.

The main alloy characteristics of magnesium alloy grade AZ91D are high strength and high corrosion resistance, and the application range is in the casing of electronic products. AM60B and AM50A have high elongation and good impact resistance, and are used in automotive steering wheels and seats. AS41B has good creep resistance and is used in the transmission case of automobiles. (Sacrificial anode application field See also text: Optical anode steel corrosion protection Trustworthy We Steel Your Trusthttp://www.kuangyue.com/zh-cn/about)