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Controlled degradation differential arc oxidized metallic support and manufacture method thereof

A technology of micro-arc oxidation and metal support, applied in the direction of support, anodic oxidation, electrolytic coating, etc., can solve the problems of too fast, completely degraded within about 2 months, complex anodic oxidation process, and insufficient corrosion resistance , to achieve the effect of avoiding function reduction, degradation rate reduction and service life extension

Active Publication Date: 2008-08-13
LEPU MEDICAL TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium alloy stent has good magnetic resonance imaging (MRI) compatibility, but it cannot be displayed under "X-ray", and must be placed under the guidance of intravascular ultrasound
The common problem of magnesium alloy stents in the prior art is that the degradation rate is too fast, and it has been completely degraded within about 2 months
[0005] However, the corrosion resistance of the magnesium alloy surface treated by anodizing in the current prior art is not high enough, the service life is short and the anodizing process is complicated

Method used

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  • Controlled degradation differential arc oxidized metallic support and manufacture method thereof

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preparation example Construction

[0029] Figure 1 is a flow chart of the method for preparing a metal stent by micro-arc oxidation under controllable degradation of the present invention. The preparation method mainly includes the following steps:

[0030] (1) select degradable magnesium or magnesium alloy as the substrate of the bracket, and machine it into a bracket;

[0031] (2) Pretreating the stent to remove oxides on the surface of the stent;

[0032] (3) the support is put into the micro-arc oxidation electrolyte, the support is used as the anode of the electrolytic cell, and direct current or alternating current is passed through to carry out the micro-arc oxidation treatment, so that the surface of the support has a micro-arc oxidation film layer;

[0033] (4) cleaning the stent after the micro-arc oxidation treatment with deionized water and an ultrasonic cleaning machine in sequence;

[0034] (5) Spraying a degradable polymer material on the surface of the cleaned stent, the degradable polymer mate...

Embodiment 1

[0059] In this embodiment, the high-purity magnesium material is selected as the matrix. After the high-purity magnesium is polished, it is carved into a vascular stent with a laser; it is first polished with gradually finer sandpaper, and the oxide on the surface is mechanically removed; then it is immediately immersed in chromic acid with a mass concentration of 80g / L solution, pickling at 80°C for 10 minutes; then place the magnesium metal bracket in a KQ-700DA table-top numerical control ultrasonic cleaning machine, and clean it at a frequency of 60kHz for 15 minutes.

[0060] Utilizing ultrasonic waves to clean the surface of the stent should include steps: (1) using a concentration of 75% medical ethanol solvent to clean for 5 minutes; (2) using a concentration of 99.5% acetone analytically pure solution to clean for 5 minutes; (3) using deionized Wash with water for 5 minutes. Finally, place the cleaned magnesium alloy stent in a dryer to dry.

[0061] Then put the bra...

Embodiment 2

[0066] After the AZ91D magnesium alloy is polished, it is laser engraved into a vascular stent. First sand with progressively finer sandpaper to remove surface oxides. Immediately immerse in a chromic acid solution with a mass concentration of 100g / L, and pickle at 100°C for 10 minutes. Then place the magnesium metal bracket in the ultrasonic cleaning pool of KQ-700DA and clean it for 15 minutes at a frequency of 80 kHz. Cleaning the surface of the stent by ultrasonic waves should include (1) cleaning with a medical ethanol solvent with a concentration of 75% for 5 minutes; (2) cleaning with acetone analytically pure solution with a concentration of 99.5% for 5 minutes; (3) cleaning with deionized water 5 minutes. Finally, place the cleaned stents in a dryer to dry.

[0067] Then put the bracket in the electrolyte, take two identical magnesium alloy brackets as the cathode and anode of the electrolytic cell, and conduct micro-arc electrodeposition on the surface of the magn...

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Abstract

The invention relates to a micro arc oxidation metal bracket capable of controlling degradation and the preparing method. The bracket is provided with a micro arc oxidation film and a degradable polymer coating. The method comprises the steps showed as follows: processing a degradable metal into a bracket; pretreating the bracket to remove the oxide at the surface of the bracket; putting the bracket into the micro arc oxidation electrolyte, as the anode of an electrobath, the bracket is put in the direct current or alternating current to have micro arc oxidation treatment, ensuring the surface of the bracket have the micro arc oxidation film; cleaning the bracket after the micro arc oxidation treatment; spraying degradable polymer material at the bracket surface after being cleaned and the degradable polymer material carries therapeutic medicine. The micro arc oxidation film at the bracket can reduce the erosion speed of the bracket remarkably, can prolong the service life of the bracket and simultaneously guarantee the mechanical property of materials in the degradation process.

Description

technical field [0001] The invention belongs to the field of implanted medical devices, and relates to a controllable degradable micro-arc oxidation metal stent treated with an anti-corrosion film layer, which can delay the degradation rate of magnesium alloy and prolong the service life of the stent, and a preparation method thereof. Background technique [0002] Magnesium is one of the most abundant elements on the earth. It is also the fourth most abundant cation in the human body and the second most abundant cation in the cell. It is an indispensable and important nutrient element in the human body. The total amount in the human body is about 20 grams. Magnesium can promote the formation of bone and cells in the process of life, catalyze or activate more than 300 enzyme systems in the body, participate in energy metabolism in the body, and play a key role in energy transportation, storage and utilization. Magnesium affects protein synthesis by regulating the structure of...

Claims

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Application Information

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IPC IPC(8): A61F2/82A61L31/02A61L31/08A61L31/14C25D11/02C25D11/18B05C5/00
Inventor 董飒英张正才徐毅蒲忠杰
Owner LEPU MEDICAL TECH (BEIJING) CO LTD
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