Electrochemical polishing structure for inner surface of magnesium alloy tube

Abstract

The invention relates to an electrochemical polishing structure for an inner surface of a magnesium alloy tube. The electrochemical polishing structure for the inner surface of the magnesium alloy tube includes a cathode line, a cathode coil, a cathode port, a tubular structure, a polishing liquid pipe and an anode port. The cathode line penetrates through the magnesium alloy tube in the axial direction, and the two ends of the cathode line are both electrically connected with the cathode port through the cathode coil. The two ends of the magnesium alloy tube are tightly connected with the tubular structure in the same axial direction correspondingly, the cathode coil is located in the tubular structure, and the side, far away from the magnesium alloy tube, of the tubular structure is connected with the polishing liquid pipe. The anode port is in contact with the magnesium alloy tube, and the anode port and the cathode port can be energized with an external power source to form an electrochemical polishing electrical connection path. Polishing liquid flows into the polishing liquid pipe on one side of the magnesium alloy tube, and flows out from the polishing liquid pipe on the other side of the magnesium alloy tube. The electrochemical polishing structure for the inner surface of the magnesium alloy tube is simple in structure and easy to operate, the quick and effective polishing treatment for the inner surface of the magnesium alloy tube can be realized, the efficiency is high and the polishing is uniform.

Description

technical field [0001] The invention relates to the field of treatment devices for the inner surface of metal pipes in the medical industry, in particular to an electrochemical polishing structure for the inner surface of magnesium alloy pipes. Background technique [0002] In recent years, magnesium alloys are often used to make absorbable vascular stents, because magnesium exists in various tissues of the human body and participates in various biological reactions. At the same time, magnesium alloys have low density, low elastic modulus, high specific strength, and are degradable. Therefore, magnesium alloy has inherent advantages as a new material for absorbable medical devices. [0003] However, most of the magnesium alloy tubes required for magnesium alloy vascular stents are processed by extrusion, rolling, drawing and other processes, and the deformation process tends to leave deformation wrinkles on the inner surface of the magnesium alloy tubes with low deformation ...

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Problems solved by technology

[0003] However, most of the magnesium alloy tubes required for magnesium alloy vascular stents are processed by extrusion, rolling, drawing and other processes, and the deformation process tends to leave deformation wrinkles on the inner surface of the magnesium alloy tubes with low deformation plasticity. The pleats increase the roughness of the inner surface of the magnesium alloy pipe, which leads to overburning or impermeability when laser cutting and engraving the magnesium alloy pipe, which further affects the smoothness of the inner surface of the magnesium alloy pipe.

However, as a material for interventional medical devices, the rough inner surface will cause platelet aggregation and deformation, affect the coagulation system and fibrinolytic system, and affect biocompatibility. Therefore, the inner surface of the magnesium alloy tube needs to be polished

[0004] Due to the small inner diameter of the magnesium alloy tube used as a vascular stent, it is not suitable to treat the inner surface of the magnesium alloy tube by mechanical processing; it is difficult to control the degree of reaction and the uniformity of polishing through chemical treatment, and it is difficult to effectively eliminate the roughness of the inner surface of the magnesium alloy tube ; The electrochemical polishing method is relatively suitable, therefore, it is necessary to design an electrochemical polishing structure for the inner surface of the magnesium alloy pipe, so as to realize the quick and effective polishing treatment of the inner surface of the magnesium alloy pipe

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