Corrosion-resistant orthopedic degradable screw and manufacturing method thereof

Abstract

The invention discloses a manufacturing method for a corrosion-resistant orthopedic degradable screw. The manufacturing method comprises the following steps that (1) a degradable metal bar, a female die and a stamping male die are provided, an open conical die cavity is formed in the female die, the other side of the die cavity communicates with an overflow hole, and the stamping male die is provided with a tip; (2) the degradable metal bar is placed in the die cavity of the female die, the stamping male die is operated to impact the degradable metal bar, the stamping male die impacts a groove in the degradable metal bar in the impact process, and a part of metal flows outsides from the overflow hole; and (3) the orthopedic screw is obtained in the die cavity through repeated impacting for a certain time for multiple times. According to the manufacturing method, through cooperation of the female die and the stamping male die, the degradable metal bar is hammered and stamped for multiple times to obtain the orthopedic screw which is of a compact structure and good in mechanical properties, so that the corrosion resistance of the orthopedic screw is improved, the degradation rate is low after the orthopedic screw is implanted into a human body, the process is simple, and the cost is low. The invention further provides the corrosion-resistant orthopedic degradable screw manufactured by the method.

Description

technical field [0001] The invention relates to the field of medical screw products, in particular to a corrosion-resistant orthopedic degradable screw and a preparation method thereof. Background technique [0002] In clinical surgery, bone transplantation, joint fusion, joint fixation, orthopedics are often used to treat diseases such as fractures and bone repair, and fixation is usually used in surgery. At present, metal fixation screws (stainless steel, titanium alloy, etc.) are mostly used in clinical fracture internal fixation. Such metal fixation screws have high mechanical properties, but they cannot be absorbed by the body because they are not degradable. A second operation is required to remove the fixation, which increases the pain and economic burden of the patient's second operation. [0003] Magnesium alloy has good mechanical compatibility and biocompatibility, and is an ideal biomedical material. Therefore, biomedical magnesium alloys have received more and...

AI Technical Summary

Problems solved by technology

But the standard electrode potential of magnesium is very low, especially Cl in body fluids - It will accelerate the corrosion of magnesium alloys, and the rapid degradation rate will lead to serious corrosion of the implanted materials before the body heals, reducing the mechanical properties and stability of the materials, and the rapid corrosion of magnesium alloys will not only be accompanied by a large amount of hydrogen release , and the too fast degradation rate will increase the local pH value of the body fluid near the implant, which will cause harm to the growth of human bones and group leaders, thus seriously restricting the clinical application of magnesium alloys.

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