Degradable magnesium alloy in-situ composite anastomotic staple and a preparation method thereof

A preparation method of a degradable magnesium alloy in-situ composite anastomotic staple, comprising the following operating steps:

• (1) melting pure Mg, Zn and Nd in proportion into magnesium alloy, casting it into ingots and homogenizing the ingots at 300-450° C. for 3-7 h;
• (2) removing the surface defects and impurities of the magnesium alloy ingots from Step (1), and extruding them into bars with a diameter of 8-10 mm as per an extrusion ratio of 60-80:1 at a temperature of 390-470° C.;
• (3) cold-drawing the magnesium alloy bars from Step (2) into wires with a diameter of 0.2-0.6 mm, and annealing them at a temperature of 280-330° C. for 30 min-120 min;
• (4) making U-shaped anastomotic staples out of the magnesium alloy wires from Step (3);
• (5) electropolishing the magnesium alloy anastomotic staples from Step (4) to remove surface defects, and then ultrasonically cleaning and drying them;
• (6) immersing the magnesium alloy anastomotic staples from Step (5) into the hydrofluoric acid with a weight concentration of 20%-60% for in-situ synthesis with MgF2 at 20-35° C. for 3 h-200 h;
• (7) ultrasonically cleaning and drying the in-situ composite magnesium alloy anastomotic staples from Step (6), and vacuum-sealing them.