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Degradable magnesium alloy plate and bar for fracture internal fixation and preparation methods thereof

A magnesium alloy plate and magnesium alloy technology are applied in the field of preparation of implantable medical materials, which can solve the problems of insufficient strength of the alloy, unfavorable to improve the biocompatibility of the alloy, lack of zinc element in the alloy, etc. Good effect of corrosion resistance, composition and structure uniformity

Inactive Publication Date: 2015-05-20
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alloys in the above documents lack zinc or zirconium elements, so the alloy strength is insufficient
Zhang Xiaobo, Wang Qiang and others added gadolinium and silver elements to the Mg-Zn-Zr alloy in the patent "Biodegradable Mg-Gd-Zn-Ag-Zr Series Magnesium Alloy and Its Preparation Method" to improve the corrosion resistance of the alloy Ag has strong solid solution strengthening and aging strengthening effects, which can improve the high temperature strength and creep resistance of medical magnesium alloys, and its unique bactericidal effect is beneficial to the safety of magnesium alloys as implants, but its The addition of toxic rare earth Gd elements in the alloy is not conducive to improving the biocompatibility of the alloy
[0005] At present, there are no reports on the processing of Mg--3wt%Zn-0.5wt%Zr-M (M=Sr, Ca, Ag) alloys into plates and rods for medical applications at home and abroad.

Method used

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  • Degradable magnesium alloy plate and bar for fracture internal fixation and preparation methods thereof
  • Degradable magnesium alloy plate and bar for fracture internal fixation and preparation methods thereof
  • Degradable magnesium alloy plate and bar for fracture internal fixation and preparation methods thereof

Examples

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Effect test

Embodiment 1

[0023] A degradable magnesium alloy rod for internal fixation of fractures, which is composed of alloying element Ca on the basis of Mg-Zn-Zr alloy, the mass percentage of each component is: Zn is 3.0wt.%, Zr is 0.5wt %, Ca is 0.2 wt.%, Mg is the balance, the content of single impurity elements such as iron, nickel, copper, and aluminum is less than 0.05%, and the total content of various impurities is not more than 0.4%.

[0024] The preparation method of the degradable magnesium alloy rod for internal fixation of fractures has the following steps:

[0025] 1) Add Mg, Zn and Mg-30wt%Zr, Mg-30wt%Ca master alloy into the graphite crucible, and evacuate to 1×10 -2 Pa, pass in argon gas for protection, heat to 720°C and keep it warm for 20 minutes, then fully stir at a speed of 5r / s for 5 minutes and then start to cool down. After the temperature drops to 690°C, pour it into the crystallizer, and take it out when it cools to 269°C. Obtain a round ingot with a diameter of 50mm; ...

Embodiment 2

[0030] A degradable magnesium alloy rod for internal fixation of fractures, which is composed of alloying element Sr on the basis of Mg-Zn-Zr alloy, the mass percentage of each component is: Zn is 3.0wt.%, Zr is 0.5wt .%, Sr is 0.3 wt.%, Mg is the balance, the content of single impurity elements such as iron, nickel, copper and aluminum is less than 0.05%, and the total content of various impurities is not more than 0.4%.

[0031] The preparation method of the degradable magnesium alloy rod for internal fixation of fractures has the following steps:

[0032] 1) Add Mg, Zn and Mg-30 wt %Zr, Mg-30 wt %Sr master alloys into the graphite crucible, and evacuate to 1×10 -2 Pa, pass in argon gas for protection, heat to 720°C and keep it warm for 20 minutes, then fully stir at a speed of 5r / s for 5 minutes and then start to cool down. After the temperature drops to 690°C, pour it into the crystallizer, and take it out when it cools to 269°C. A round ingot with a diameter of 50mm is o...

Embodiment 3

[0037] A kind of degradable magnesium alloy bar material for internal fixation of fractures is formed by adding alloy elements Ca and Ag on the basis of Mg-Zn-Zr alloy, and the mass percentage of each component is: Zn is 3.0wt.%, Zr is 0.5wt.%, Ca is 0.3 wt.%, Ag is 0.1 wt.%, Mg is the balance, the content of single impurity elements such as iron, nickel, copper, aluminum is less than 0.05%, and the total content of various impurities is not more than 0.4% .

[0038] The preparation method of the degradable magnesium alloy rod for internal fixation of fractures has the following steps:

[0039] 1) Add Mg, Zn and Mg-30 wt %Zr, Mg-30 wt %Sr and Mg-30 wt %Ag master alloys into the graphite crucible, and evacuate to 1×10 -2 Pa, pass in argon gas for protection, heat to 720°C and keep it warm for 20 minutes, then fully stir at a speed of 5r / s for 5 minutes and then start to cool down. After the temperature drops to 690°C, pour it into the crystallizer, and take it out when it cool...

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Abstract

The invention relates to a degradable magnesium alloy plate and a bar for fracture internal fixation. The degradable magnesium alloy plate and bar are prepared by adding one or two of Sr, Ca and Ag based on a Mg-Zn-Zr alloy, wherein the degradable magnesium alloy plate comprises the following components in percentage by mass: 3.0wt% of Zn, 0.5wt% of Zr, 0.0-1.0 wt% of Ca, 0.0-1.0wt% of Ag, 0.0-1.5wt% of Sr, and the balance of Mg, wherein the content of each of iron, nickel, copper, aluminum single impurity element is less than 0.05% and the total amount of the impurities is not more than0.4%. The degradable magnesium alloy plate and the bar have the advantages of high purity, good uniformity composition and microstructure and higher strength and corrosion resistance; the contained elements such as calcium and strontium can promote bone growth so that the alloy has better biocompatibility; the silver element is added so as to improve antibacterial property of an implant; and the degradable magnesium alloy plate and the bar is suitable for being applied in fracture fixation materials.

Description

technical field [0001] The invention relates to the preparation of implantable medical materials, in particular to a degradable magnesium alloy plate and bar for fracture internal fixation and a preparation method thereof. Background technique [0002] With the continuous development and research of medical implant materials and the continuous improvement of people's demand for implant materials, materials such as stainless steel and titanium alloy have achieved great development in the field of orthopedic implants due to their excellent corrosion resistance and biocompatibility. And a wide range of applications, but because the tensile strength and elastic modulus of these metal materials are much higher than that of bone, for example, the elastic modulus of titanium alloy is 110 GPa, which is about 10 times that of human bone, After being implanted into the human body, it will produce a stress shielding effect, which greatly reduces the stress stimulation that the bone sh...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22F1/06A61L31/02A61L31/14
CPCC22C23/04A61L31/022A61L31/14C22F1/06
Inventor 陈民芳李祯李晨光刘德宝由臣
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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