Surface polishing technology of magnesium alloy intravascular stent and assisting mechanism

A magnesium alloy blood vessel and surface polishing technology, which is applied to polishing compositions containing abrasives, electrolytic processes, electrolytic components, etc., can solve the problem of high surface structure requirements, complex processes and accessories, and difficult magnesium alloy polishing processes. Requirements for vascular stents and other issues to achieve the effect of improving surface quality and ensuring polishing quality

Pending Publication Date: 2018-06-22
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The polishing of magnesium alloys is mainly divided into three types: mechanical polishing, chemical polishing and electrochemical polishing. The mechanical polishing process is relatively simple, but it has high requirements on the surface structure of the sample, and it is difficult to implement on the surface of complex structures; the chemical polishing process is simple and does not affect the process. The shape is not required, but the controllability of the polishing quality is poor; the electrochemical polishing process and accessories are relatively complicated, but the polishing quality is controllable and the sample surface quality is high
[0004] Magnesium alloy vascular stent has the characteristics of thin wall and small diameter, and vascular stent has high requirements on surface quality, which makes it difficult for the original polishing process for magnesium alloy to meet the requirements of magnesium alloy vascular stent

Method used

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  • Surface polishing technology of magnesium alloy intravascular stent and assisting mechanism
  • Surface polishing technology of magnesium alloy intravascular stent and assisting mechanism

Examples

Experimental program
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Effect test

Embodiment 1

[0040] S1, the magnesium alloy vascular stent is fixed, and then the surface of the magnesium alloy vascular stent is mechanically polished. The polishing agent is a mixture of 0.1 μm diamond and absolute ethanol, and the volume ratio is 1:20.

[0041] S2, add 300ml of acetone and 100ml of absolute ethanol into a 1000ml beaker, place the mechanically polished magnesium alloy stent in the beaker, and clean it with ultrasonic vibration at 20°C for 15 minutes.

[0042]S3, add 300ml of deionized water to a 1000ml beaker, then add 150ml of phosphoric acid, 10ml of nitric acid, 20ml of absolute ethanol, and 20g of ammonium hydrofluoride to make a pickling solution, and put the decontaminated magnesium alloy stent into the pickling solution solution, ultrasonic treatment at 25°C for 1.5 minutes; then, add 200ml of deionized water to a 1000ml beaker, add 2.0g of analytically pure potassium hydroxide and pure sodium carbonate, and configure it into an alkaline cleaning solution, and the...

Embodiment 2

[0047] Example 2 of the present invention is basically the same as Example 1, except that: in S1, the volume ratio of diamond in the polishing agent to absolute ethanol is 1:25; in S2, the ultrasonic decontamination process is processed at 30°C 10 minutes; in S3, the ultrasonic treatment time was 2 minutes; in S4, the polishing temperature was 40°C, the voltage was 9V, and the polishing time was 2 minutes; in S5, the ultrasonic cleaning was 12 minutes, and the cleaning temperature was 30°C.

[0048] In order to ensure that the magnesium alloy stent is fully electrochemically polished, the present invention also provides an auxiliary mechanism, such as figure 2 , which includes an anode wire 1 and a cathode mesh cage 2. The anode wire 1 is used for fixed connection with the magnesium alloy vascular stent 3. In this embodiment, the anode wire 1 is selected as a U-shaped stainless steel wire. When installing, the U-shaped stainless steel wire crosses through the Through the holl...

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Abstract

The invention relates to the technical field of metal surface polishing, and discloses a surface polishing technology of a magnesium alloy intravascular stent and an assisting mechanism. The technology comprises the steps of: S1, fixing the magnesium alloy intravascular stent; and mechanically polishing the magnesium alloy intravascular stent; S2, ultrasonically cleaning the mechanically polishedmagnesium alloy intravascular stent; S3, correspondingly performing ultrasonic acid pickling and alkaline washing on the magnesium alloy intravascular stent after cleaning; S4, electrochemically polishing the magnesium alloy intravascular stent; S5, ultrasonically washing the magnesium alloy intravascular stent; and S6, performing vacuum drying and sealing. The assisting mechanism is used for fixing the magnesium alloy intravascular stent during electrochemical polishing. With the adoption of the technology and the assisting mechanism, deep scratches on the surface of the magnesium alloy intravascular stent can be effectively removed, so that the surface quality can be improved, and as a result, the magnesium alloy intravascular stent with smooth surface can be obtained.

Description

technical field [0001] The invention relates to the technical field of metal surface polishing, in particular to a surface polishing process and an auxiliary mechanism of a magnesium alloy bracket. Background technique [0002] Magnesium alloys have the advantages of low density, low elastic modulus, high specific strength, and degradability. Magnesium is an essential trace element for human metabolism. It exists in various tissues of the human body and participates in various biological reactions. Therefore, magnesium alloys As a new material for absorbable medical devices, it has inherent advantages. In recent years, the innovative development of absorbable vascular stents has promoted the research progress of magnesium alloys in the field of interventional medical devices. However, the low melting point and easy oxidation of magnesium alloys make it easy to generate slag at the cutting position during laser cutting, which affects the surface finish of vascular stents. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/18C25F7/00C09G1/02C23G5/032C23G1/12C23G1/22
CPCC09G1/02C23G1/12C23G1/22C23G5/032C25F3/18C25F7/00
Inventor 盛立远
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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