Degradable magnesium metal nail for patch fixation and use method

Abstract

The invention provides a degradable magnesium metal nail for patch fixation and a use method, the degradable magnesium metal nail for patch fixation comprises a metal nail body, the metal nail body isa metal wire wound in the spiral direction, and the metal wire is made of pure magnesium or magnesium alloy; the nail head and the nail tail are arranged at the two ends of the metal nail body respectively, the nail head is of a triangular pyramid structure, the nail tail is of a hemispherical fillet structure or a bent structure, and the preparation process of the metal nail comprises one or more stress relief annealing processes. The metal nail can be degraded in vivo, immunological rejection and foreign matter reaction caused by long-term in-vivo existence of the implant are avoided, a local weakly-alkaline environment can be formed at the implanted part through degradation, and an antibacterial effect is achieved; the triangular pyramid structure of the nail head enhances the puncturecapacity of the nail to tissues, the hemispherical fillet structure or the bent structure of the nail tail relieves the damage of the nail to human tissues, the stress relief annealing of the metal nail effectively releases the residual stress on a finished product, and the corrosion rate after implantation is reduced.

Description

technical field [0001] The invention relates to the field of implanted medical devices, in particular to a degradable magnesium metal nail for patch fixation and a use method. Background technique [0002] In surgery, it is often necessary to use a fixation device to fix the implant on human tissues or organs, so that the implant can exert its intended implantation effect and not shift during or after the operation. Taking hernia repair as an example, the current standard method of hernia repair is open or laparoscopic tension-free mesh technology, which can effectively reduce the postoperative hernia recurrence rate. The tension-free hernia mesh involved in this operation usually needs to be fixed to prevent displacement. Once displaced, it may lead to hernia recurrence in severe cases. [0003] At present, the fixation methods used for tension-free hernia mesh mainly include suture fixation, medical glue fixation, and tacker fixation. The cost of suture fixation is low a...

AI Technical Summary

Problems solved by technology

After failure analysis, it was found that: non-degradable nails have good corrosion resistance, basically no corrosion occurs after implantation, and there is no need to consider various problems caused by the gradual corrosion of the nails in the living body; The cumulative deformation is large, and a large amount of residual stress will remain after deformation. Magnesium and magnesium alloys are sensitive to stress corrosion. The residual stress in magnesium and magnesium alloys will accelerate their corrosion rate in the body, and the shape of the tail of the magnesium metal nail When the bending deformation is larger, it is easy to cause stress concentration after bending deformation, and severe local corrosion will occur at the stress concentration part, which will cause the tail of the magnesium metal nail to corrode and fall off in advance, which increases the risk of implantation.

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