Corrosion-resistant magnesium alloy bracket and preparation method thereof

A magnesium alloy stent, corrosion-resistant technology, applied in stents, other medical devices, anodic oxidation, etc., can solve the problems of low bonding strength between the coating and the substrate, poor corrosion resistance and durability, and poor coordination and deformation ability of the stent, etc., to achieve improvement Effects of biocompatibility and wear resistance, enhanced corrosion resistance, and extended service life

Inactive Publication Date: 2010-08-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low bonding strength between the coating and the substrate, poor corrosion resistance and durability, poor mechanical bearing

Method used

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  • Corrosion-resistant magnesium alloy bracket and preparation method thereof
  • Corrosion-resistant magnesium alloy bracket and preparation method thereof

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Experimental program
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specific Embodiment approach 1

[0014] Embodiment 1: The corrosion-resistant magnesium alloy stent of this embodiment is a mesh stent; the corrosion-resistant magnesium alloy stent is made by in-situ generation of a ceramic coating on the surface of the magnesium alloy by micro-arc oxidation; the ceramic coating The thickness of the layer is 5-30 microns; the inner layer of the ceramic coating is dense, the outer layer is microporous, the density of the inner layer is 85%-90% (volume), and the diameter of the micropores of the outer layer is 3-5 microns.

[0015] After the stent of the invention is implanted in the body, the degradation rate can be adjusted and the surface coating can be deformed with the stent. In this embodiment, the corrosion-resistant ceramic coating grown in situ and the substrate are high-strength metallurgical bonds, so that it has high hardness (above 380HV) and good toughness, and can coordinate deformation with the substrate support, and the ceramic coating does not peel off; The c...

specific Embodiment approach 2

[0016] Embodiment 2: This embodiment is different from Embodiment 1 in that: the thickness of the ceramic coating is 10-15 microns. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0017] Embodiment 3: This embodiment is different from Embodiment 1 in that: the thickness of the ceramic coating is 18-20 microns. Others are the same as in the first embodiment.

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Abstract

The invention discloses a corrosion-resistant magnesium alloy bracket and a preparation method thereof, which relate to a magnesium alloy bracket with a corrosion-resistant coating and the preparation method thereof. The bracket and the method solve the problems of low bonding strength between the coating and a substrate, poor corrosion-resistant lasting stability, low mechanical bearing capacity and poor bracket coordination and deformation ability of the traditional magnesium alloy bracket. The corrosion-resistant magnesium alloy bracket is prepared by growing a ceramic coating in situ on the surface of the magnesium alloy by a micro-arc oxidation process. The method of the invention comprises the following steps: 1, processing the magnesium alloy to make a net-like bracket and removing oil to obtain the magnesium alloy bracket; 2, performing the micro-arc oxidation reaction; and 3, cleaning and drying the bracket to obtain the corrosion-resistant magnesium alloy bracket. The product of the invention is high in hardness and relatively high in tenacity and can coordinate with a substrate bracket to deform; and the ceramic coating is insusceptible to falling off and is high in body fluid corrosion resistance, so life cycle of the embedded bracket can be prolonged to a maximum extent. The method is simple and low in cost and can realize mass production. The product of the invention is suitable for implants with complex shapes, such as brackets, and is convenient to promote and use.

Description

technical field [0001] The invention relates to a magnesium alloy bracket with a corrosion protection coating and a preparation method thereof. Background technique [0002] Magnesium, as the main component of degradable alloy stents, has many unique advantages such as abundant resources, non-toxicity, easy degradation, and low price; magnesium ions are converted into magnesium ions by corrosion reaction in body fluid environment, and magnesium ions are absorbed through the body and kidneys. The metabolism of magnesium alloy is gradually absorbed and degraded in the body; magnesium alloy has good mechanical properties (especially the elastic modulus is similar to human bone), and the degradation products have minimal side effects, making it a candidate material for scaffolds. However, the biggest disadvantage of magnesium alloy stents is that the corrosion degradation rate is too fast in the implantation environment of body fluids, and mechanical failure due to degradation o...

Claims

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Application Information

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IPC IPC(8): A61F2/90A61M31/00A61L31/08C25D11/30
Inventor 王亚明田原郭君巍郭立新周玉
Owner HARBIN INST OF TECH
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