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Degradable magnesium alloy femoral internal fixation screw and preparation method thereof

A technology for fixing screws and magnesium alloys, which is applied in the fields of biodegradable femoral internal fixation implantation devices, bone screws, and orthopedic internal fixation devices. Cost, structure size optimization, effect of improving stress concentration phenomenon

Inactive Publication Date: 2021-01-29
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned bone screw has high pull-out resistance, its structure is complex, production and processing are difficult, and the hollow structure also prevents it from being used as the screw of the main load-bearing part, making the operation difficult
In many existing technologies, the structure of the screw is very complicated, and no suitable biological material is selected, which lacks practicability

Method used

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  • Degradable magnesium alloy femoral internal fixation screw and preparation method thereof
  • Degradable magnesium alloy femoral internal fixation screw and preparation method thereof
  • Degradable magnesium alloy femoral internal fixation screw and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0031] The magnesium alloy in this embodiment is composed of the following components in mass percentage: Zn 2.0%, Ca 0.19%, Mn 0.3%, and the balance is Mg and unavoidable impurities.

[0032] The preparation method is as follows:

[0033] Material selection: use pure magnesium ingot with a purity greater than 99.99% as the magnesium raw material, use zinc particles with a purity greater than 99.9% as the zinc raw material, and use a magnesium-calcium master alloy with a mass fraction of 25% as the calcium raw material with a mass fraction of 10%. The magnesium-manganese master alloy is used as the manganese raw material.

[0034] Smelting: Pickling and drying the raw materials used for the aforementioned magnesium alloys, putting them into a graphite crucible, introducing a protective gas (SF6:N2=0.4%:99.6%), and keeping the smelting process under a protective atmosphere. After the magnesium ingot and intermediate alloy are melted, use a hand-held electric drill to stir the ...

Embodiment 2

[0038] The magnesium alloy in this embodiment is composed of the following components in mass percentage: Zn 2.3%, Ca 0.2%, Mn 0.5%, and the balance is Mg and unavoidable impurities. The preparation method is the same as in Example 1.

Embodiment 3

[0040] The magnesium alloy in this embodiment is composed of the following components in mass percentage: Zn 2.5%, Ca 0.2%, Mn 0.7%, and the balance is Mg and unavoidable impurities. The preparation method is the same as in Example 1.

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Abstract

The invention provides a degradable magnesium alloy femoral internal fixation screw and a preparation method thereof. Pure magnesium cast ingots, zinc particles, magnesium-calcium intermediate alloy and magnesium-manganese intermediate alloy are used as raw materials, and Mg-Zn-Ca-Mn alloy with excellent mechanical properties and a lower degradation rate is obtained through smelting, solution treatment, hot extrusion and other preparation methods; and the femoral internal fixation screw is designed and machined through the magnesium alloy material, meanwhile, the structure and the size of thescrew are optimized, a screw structure comprises a screw head, a screw body with threads and a transition circular bead connecting the screw head and the screw body, and the screw head is provided with a plum blossom groove. The optimized magnesium alloy screw has the mechanical property meeting the implantation requirement and the lower degradation rate.

Description

technical field [0001] The invention relates to an orthopedic internal fixation device among medical devices, and belongs to the field of biomedical auxiliary devices, in particular to a biodegradable femur internal fixation device, which is a bone screw prepared from a degradable magnesium alloy. Background technique [0002] Bone implant equipment requires excellent biocompatibility and stable biosafety. Commonly used orthopedic implant materials include metals, high molecular polymers, artificial tissue engineering materials, ceramics, etc. Titanium alloys, stainless steel, etc. are typical representatives of metal materials for medical implants. These materials have sufficient strength and are chemically inactive, and are used for dental orthopedics and bone damage repair; polymers are used for fractures in non-load-bearing parts, but If the elastic modulus of the former is too large, it will produce a stress shielding effect and require a second operation to remove it, ...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03C22F1/06
CPCC22C1/03C22C23/04C22F1/06
Inventor 陈民芳王亮由臣
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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