Magnesium alloy screw for ankle joint lower tibiofibular joint injury

Abstract

The invention belongs to the technical field of magnesium alloy screw application, and particularly relates to a magnesium alloy screw for ankle joint lower tibiofibular joint injury. When the magnesium alloy screw is used, a universal screwing device used in the magnesium alloy screw comprises a supporting shell, a screwing column and an adjusting block; a fixing plate is fixedly connected to theupper surface of the supporting shell; the screwing column is rotationally connected to the interior of the fixing plate; an adjusting plate is in threaded connection with the lower surface of the supporting shell; and the adjusting block is slidably connected to the upper surface of the adjusting plate. According to the magnesium alloy screw, the screwing direction is effectively converted, through the universal screwing device, the direction of the screw needing to be obliquely driven into the bone is fixed in the early driving stage, then through vertical screwing, oblique transmission ofthe screw can be achieved, the stability of oblique punching of the screw is guaranteed, and oblique fixed connection in bone reduction and fixation surgery is facilitated; by using the magnesium alloy screw, the screw can coexist in the bone of the human body for a long time.

Description

technical field [0001] The invention belongs to the technical field of application of magnesium alloy screws, in particular to a magnesium alloy screw for ankle joint injury. Background technique [0002] The study of magnesium and magnesium alloy materials as orthopedic implants has been further deepened. Magnesium alloys have the following characteristics: Magnesium is a metal with an extremely low density, with a density of 1.74g / cm 2 , and human bone density (1.75g / cm 2 ) is close, the elastic modulus of magnesium is 41 ~ 45GPa, which is closer to bone tissue than traditional metal implants. Magnesium is one of the trace elements in the human body, half of which exists in bone tissue. Therefore, as long as magnesium and magnesium are controlled The corrosion degradation rate of alloy implants will not cause the increase of serum Mg2+ after implantation of magnesium and magnesium alloy materials, which has good biological safety. Magnesium and magnesium alloys are easily...

AI Technical Summary

Problems solved by technology

[0005] In order to make up for the deficiencies of the existing technology and solve the existing technology, the current treatment principle for the separation of the lower tibial row joint injury is reduction and fixation. Screws are needed in the fixation process. The metal materials commonly used in orthopedic clinics include medical stainless steel, titanium alloy, Chromium alloy, etc. This kind of medical metal materials are all inert metals. They have been used clinically for a long time as bone or joint substitutes and internal fixation for fractures. The amount does not match the bone tissue, and it will produce a "stress shielding" effect after implantation, resulting in slowed bone healing, autologous bone resorption, and osteoporosis; the second is biological defects, that is, the implant remains in the body for a long time, which may After friction with the surrounding tissue, abrasive debris is produced, releasing toxic ions, causing inflammatory reactions and allergic reactions around the implant, affecting the health of the body, and requiring a second operation to remove the implant. Surgeons need to drive screws into the bone of the lower tibial symphysis to realize the reduction and fixation of the lower tibial symphysis bone. However, due to the uncertainty of the direction of the fracture, the direction of screw fixation is different in each operation. Through different connections driven into the bone, it is suitable for the reduction and fixed connection of different fractures. When the screw is driven into the bone vertically, it is more convenient and easy, but when it is driven into the bone in an oblique manner, it is prone to screw deviation, bending and difficulty. Rotation operation and other problems, the present invention proposes a magnesium alloy screw for the injury of tibiofibular syndesmosis

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