Electrolytic polishing solution for magnesium alloy medical heart stent and surface polishing processing technology of medical heart stent

Abstract

The invention relates to an electrolytic polishing solution for a magnesium alloy medical heart stent and a surface polishing processing technology of the medical heart stent. The electrolytic polishing solution for the medical heart stent is prepared from alcohol and acid. The magnesium alloy surface polishing processing technology of the medical heart stent comprises the first step of mechanical grinding and polishing, the second step of oil and dirt removing, the third step of ultrasonic vibrating and alkali washing, the fourth step of electrolytic polishing, the fifth step of ultrasonic vibrating and alcohol washing and the sixth step of drying and vacuum sealing storage. A product obtained through the fifth step is dried, and a finished magnesium alloy heart stent with the bright mirror surface is obtained and is stored by a vacuum package bag in a sealed manner. By means of the technical scheme, firstly, chromic anhydride large in toxicity and serious in pollution is not contained, the processing difficulty of the waste polishing solution is lowered, the environment pollution is reduced, and the polishing solution is environmentally friendly; secondly, the requirement of the polishing technology for the temperature range is not high, the effect of polishing the bright mirror surface can be achieved under the room temperature, and therefore the operation cost is greatly reduced; and thirdly, reaction time is short and is 1-10 min. Compared with a traditional polishing technology, the polishing electrolysis time can be greatly shortened, and accordingly energy consumption is effectively reduced.

Description

technical field [0001] The invention relates to a metal surface polishing liquid, in particular to an electrolytic polishing liquid for a magnesium alloy medical heart stent and a surface polishing process thereof. Background technique [0002] In recent years, magnesium alloy as a biodegradable implant material has been widely and deeply studied. Magnesium is an essential trace element to maintain human metabolism. It exists in various tissues of the human body, participates in various biological reactions, and has good biological properties. Compatibility and excellent mechanical properties make it the preferred material for degradable cardiovascular stents. [0003] However, many adverse biological reactions will occur during the direct contact between metal stents with uneven surfaces and blood, such as platelet aggregation, adhesion, and deformation on the surface of the stent material, activation of the coagulation system and fibrinolytic system, resulting in the forma...

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Problems solved by technology

[0003] However, many adverse biological reactions will occur during the direct contact between metal stents with uneven surfaces and blood, such as platelet aggregation, adhesion, and deformation on the surface of the stent material, activation of the coagulation system and fibrinolytic system, resulting in the formation of thrombus and intima hyperplasia, and then lead to atherosclerosis, therefore, it is necessary to polish the surface of magnesium alloy samples

[0004] Magnesium alloy polishing can be divided into three methods: mechanical polishing, chemical polishing and electrolytic polishing. Mechanical polishing is not suitable for complex-shaped workpieces such as magnesium alloy brackets; chemical polishing is low in cost and has no special requirements for the geometry of the workpiece, but The controllability of polishing quality is poor, which is not conducive to mass production; the advantages of electrochemical polishing over chemical polishing are high production efficiency, low equipment cost, low workpiece surface roughness, long electrolyte life and continuous use, etc.

[0005] Electrochemical polishing uses the workpiece to be polished as the anode and the insoluble metal as the cathode. The two poles are immersed in the electrolytic cell at the same time, and a direct current ionization reaction is used to produce selective anode dissolution, so as to achieve the removal of fine burrs on the surface of the workpiece and increase the brightness. Electrochemical polishing has become an important technical means to control the surface roughness of metals. However, magnesium alloy cardiovascular stents have their own cost, material and shape limitations, and requirements for degradation rates, which can simultaneously improve the surface roughness and Corrosion-resistant stent polishing processes are rarely reported

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