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Coated magnesium alloy bone nail, bone plate and cancellous bone screw and preparation method thereof

A technology of magnesium alloy and cancellous bone, applied in coating, metal material coating technology, medical science and other directions, can solve the problem of unreported fluorapatite coating and so on

Active Publication Date: 2017-08-08
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the research status at home and abroad, Mg-3wt%Zn-M (M= Zr, Sr, Ca, Ag) alloy is currently used in the processing of bone nails, bone plates and cancellous bone screws, and it is treated with HF acid aqueous solution The method and process of obtaining fluoroapatite coating by two-step treatment with Ca and P solutions have not been reported yet

Method used

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  • Coated magnesium alloy bone nail, bone plate and cancellous bone screw and preparation method thereof
  • Coated magnesium alloy bone nail, bone plate and cancellous bone screw and preparation method thereof
  • Coated magnesium alloy bone nail, bone plate and cancellous bone screw and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] A coated magnesium alloy bone nail and bone plate, the magnesium alloy is composed of Mg, Zn, and Zr with a purity greater than 99.99 wt.%, and the mass percentages of each component are: Zn is 3%, Zr is 0.6%, Mg for the margin.

[0024] The preparation method of the coated magnesium alloy bone nail and bone plate is as follows:

[0025] 1) Add Mg, Zn and Mg-30 wt.% Zr master alloy into the graphite crucible, and evacuate to 1×10 -2 Pa, pass through argon protection, heat to 780°C and keep it warm for 20 minutes, then fully stir at a speed of 8r / s for 8min, then start to cool down, pour the temperature into a crystallizer after the temperature drops to 650°C, and obtain a round ingot with a diameter of 40mm;

[0026] 2) Place the above-mentioned round ingot in an air furnace, homogenize and anneal at 300°C for 36 hours, then raise the temperature to 510°C for solid solution for 2 hours, and then quench into warm water at 30-50°C;

[0027] 3) Hot extrusion is carried o...

Embodiment 2

[0033] A coated magnesium alloy cancellous bone screw, the magnesium alloy is composed of Mg, Zn, and Zr with a purity greater than 99.99 wt.%, and the mass percentages of each component are: Zn is 3%, Zr is 0.6%, and Mg is margin.

[0034] The preparation method of the coated magnesium alloy cancellous bone screw, the steps are as follows:

[0035]1) Add Mg, Zn and Mg-30 wt.% Zr master alloy into the graphite crucible, and evacuate to 1×10 -2 Pa, pass through argon protection, heat to 780°C and keep it warm for 20 minutes, then fully stir at a speed of 8r / s for 8min, then start to cool down, pour the temperature into a crystallizer after the temperature drops to 650°C, and obtain a round ingot with a diameter of 40mm;

[0036] 2) Place the above round ingot in an air furnace, homogenize and anneal at 300°C for 36 hours, then raise the temperature to 510°C for 2 hours, and then quench it into warm water at 30-50°C;

[0037] 3) Hot extrusion was performed at 300°C with an ext...

Embodiment 3

[0043] A coated magnesium alloy bone nail and bone plate, the magnesium alloy is composed of Mg, Zn, Zr, and Ca with a purity greater than 99.99 wt.%, and the mass percentage of each component is: Zn is 3%, Zr is 0.6% , Ca is 0.1%, and Mg is the balance.

[0044] The preparation method of the coated magnesium alloy bone nail and bone plate is as follows:

[0045] 1) Add Mg, Zn and Mg-30 wt.% Zr, Mg-30 wt.%Ca master alloy into the graphite crucible, and evacuate to 1×10 -2 Pa, pass through argon protection, heat to 780°C and keep it warm for 20 minutes, then fully stir at a speed of 8r / s for 8min, then start to cool down, pour the temperature into a crystallizer after the temperature drops to 650°C, and obtain a round ingot with a diameter of 40mm;

[0046] 2) Place the above round ingot in an air furnace, homogenize and anneal at 300°C for 36 hours, then raise the temperature to 510°C for solid solution for 3 hours, and then quench into warm water at 30-50°C;

[0047] 3) Hot...

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Abstract

The invention discloses coated magnesium alloy bone nails, bone plates and cancellous bone screws. The magnesium alloy consists of Mg of which the purity is more than 99.99wt%, Zn and adding elements, wherein the adding elements refer to one, two or three in Zr, Sr, Ca and Ag; and the magnesium alloy comprises the following components in percentage by mass: 3 percent of Zn, 0.2-1.0 percent of Zr, 0-1.0 percent of Sr, 0-1.0 percent of Ca, 0.0-1.0 percent of Ag and the balance of Mg. The coated magnesium alloy bone nails, bone plates and cancellous bone screws have the advantages that after being subjected to comprehensive treatment, the magnesium alloy bone nails, bone plates and cancellous bone screws have reasonable degradation rate, capacity of promoting new bone growth in the living body and high biocompatibility; particularly, after the bone nails, bone plates and cancellous bone screws are treated by the mixed aqueous solution of hydrofluoric acid and calcium and phosphorus compounds, the corrosion rate can be regulated by virtue of the thickness of the surface fluorides and fluorapatite layer, and the requirement on rigid fixation time of the bone nails, bone plates and cancellous bone screws before internal fracture fixation within 3 months can be met.

Description

technical field [0001] The invention relates to a processing and treatment process of a degradable and absorbable magnesium alloy product for fracture internal fixation, in particular to a coating magnesium alloy bone nail, bone plate and cancellous bone screw and a preparation method thereof. Background technique [0002] Magnesium alloys have great application prospects in the field of degradable medical implant materials due to their unique and excellent physical and chemical properties. Compared with other medical metals, the elastic modulus of magnesium alloy is about 40GPa, which is only 2-3 times of the elastic modulus of human bone, far lower than the existing metals such as stainless steel and titanium alloy. Therefore, the magnesium alloy will greatly reduce the stress shielding effect after implantation, and has good mechanical compatibility with bone tissue. Magnesium alloys are also unique in their degradable properties. Magnesium alloys produce Mg in the human...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L31/02A61L31/08A61L31/14C22C23/04C23C22/22
Inventor 陈民芳李祯姜舒婷由臣刘德宝
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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