Method for preparing composite ceramic membrane on surface of magnesium alloy intravascular stent by micro-arc oxidation

A technology of magnesium alloy blood vessels and composite ceramic membranes, which is applied in the direction of stents, anodic oxidation, coating, etc., can solve problems such as unsatisfactory requirements, and achieve the effect of improving fracture toughness

Inactive Publication Date: 2014-06-25
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the continuous promotion of the scope of application of magnesium alloys, the requirements for the preparation of ceramic films by micro-arc oxidation of magnesium alloys are also increasing, especially when magnesium alloys are used as intraluminal stent materials, the micro-arc oxidation The corrosion resistance and toughness of the formed ceramic film need to meet further requirements, and the ceramic film prepared by the existing technology can no longer meet the requirements for intraluminal stent materials in the medical field

Method used

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  • Method for preparing composite ceramic membrane on surface of magnesium alloy intravascular stent by micro-arc oxidation
  • Method for preparing composite ceramic membrane on surface of magnesium alloy intravascular stent by micro-arc oxidation
  • Method for preparing composite ceramic membrane on surface of magnesium alloy intravascular stent by micro-arc oxidation

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Embodiment 1

[0035] This embodiment includes the following steps:

[0036] Step 1. Use deionized water as the solvent to prepare the electrolyte solution, adjust the pH of the electrolyte solution to 10 with ammonia water, and then place the electrolyte solution in an ultrasonic cleaner for ultrasonic treatment for 4 hours to disperse the components evenly before use; The liquid includes 15g of ammonium fluozirconate, 13g of sodium pyrophosphate, 11g of trisodium phosphate, 3g of ammonium citrate, 8g of nano zirconium dioxide powder, and 3g of ammonium cerium nitrate;

[0037] Step 2. Place the magnesium alloy stent to be treated in the electrolyte after ultrasonic treatment in Step 1 as the anode, use the stainless steel plate as the cathode, and use the stainless steel wire covered with an insulating plastic film as the auxiliary cathode to control the electrolyte. The temperature is 35°C, the pulse frequency of the micro-arc oxidation power supply is adjusted to 650Hz, the duty cycle is...

Embodiment 2

[0042] This embodiment includes the following steps:

[0043] Step 1. Use deionized water as the solvent to prepare the electrolyte, adjust the pH of the electrolyte to 8 with ammonia water, and then place the electrolyte in an ultrasonic cleaner for ultrasonic treatment for 2 hours to make the components evenly dispersed before use; The liquid includes 10g of zirconium hydroxide, 10g of sodium pyrophosphate, 8g of trisodium phosphate, 2g of ammonium citrate, 5g of nano zirconium dioxide powder, and 2g of ammonium cerium nitrate;

[0044] Step 2. Place the magnesium alloy stent to be treated in the electrolyte after ultrasonic treatment in Step 1 as the anode, use the stainless steel plate as the cathode, and use the stainless steel wire covered with an insulating plastic film as the auxiliary cathode to control the electrolyte. The temperature is 20°C, the pulse frequency of the micro-arc oxidation power supply is adjusted to 300Hz, the duty cycle is 40%, and the voltage is 3...

Embodiment 3

[0047] This embodiment includes the following steps:

[0048] Step 1. Use deionized water as a solvent to prepare an electrolyte, adjust the pH of the electrolyte to 12 with ammonia water, and then place the electrolyte in an ultrasonic cleaner for ultrasonic treatment for 5 hours to disperse the components evenly before use; The liquid includes 20 g of zirconium carbonate, 15 g of sodium pyrophosphate, 15 g of trisodium phosphate, 5 g of ammonium citrate, 10 g of nanometer zirconium dioxide powder, and 5 g of ammonium cerium nitrate;

[0049] Step 2. Place the magnesium alloy stent to be treated in the electrolyte after ultrasonic treatment in Step 1 as the anode, use the stainless steel plate as the cathode, and use the stainless steel wire covered with an insulating plastic film as the auxiliary cathode to control the electrolyte. The temperature is 50°C, the pulse frequency of the micro-arc oxidation power supply is adjusted to 1000Hz, the duty cycle is 10%, and the voltag...

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Abstract

The invention discloses a method for preparing a composite ceramic membrane on the surface of a magnesium alloy intravascular stent by micro-arc oxidation. The method comprises the following steps: 1) preparing an electrolyte; 2) performing micro-arc oxidation treatment by taking the magnesium alloy intravascular stent as an anode, taking a stainless steel plate as a cathode and taking a stainless steel wire with the surface coated with an insulating plastic membrane as an auxiliary cathode so as to in-situ grow a layer of uniform composite ceramic membrane on the surface of the magnesium alloy intravascular stent. Micron-grade holes which are uniformly distributed in the prepared composite ceramic membrane can be used as carriers for directly transporting a medicament to a lesion part in a tubular cavity. When the composite ceramic membrane is not subjected to hole sealing post-treatment, the resistance to corrosion of neutral NaCl salt mist can be up to 500h, the resistance to corrosion of a simulated body fluid environment can be up to 2400h, and the fracture toughness is obviously improved. The preparation process disclosed by the invention has the advantages of high efficiency and energy conservation.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, and in particular relates to a method for preparing a composite ceramic film by micro-arc oxidation on the surface of a magnesium alloy vascular stent. Background technique [0002] Intraluminal stent is a medical device with excellent curative effect for the treatment of various channel stenosis symptoms. With the improvement of living standards, people pay more and more attention to their own health. The use of intraluminal stents in modern medicine Demand is also growing rapidly. However, there are still some problems in the stents currently used in clinical practice. In addition to the further optimization of the structural design, the more important problem is that the corrosion resistance and biocompatibility of the stent materials in the lumen need to be improved. Therefore, it is very necessary to study the surface modification of intraluminal stent materials to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30A61F2/82A61L27/30
Inventor 陈宏郝建民任朋军胡晓曼杨敏
Owner CHANGAN UNIV
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