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Preparation method of degradable magnesium alloy capillary tube for intravascular stent

A vascular stent and magnesium alloy technology are applied in the field of preparation of degradable magnesium alloy capillary materials for vascular stents, which can solve the problems of complicated preparation process of magnesium alloy seamless capillary, and achieve the effects of low processing cost and simple preparation process.

Pending Publication Date: 2022-03-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of cumbersome preparation process of magnesium alloy seamless capillary at present, and can guarantee high performance at the same time

Method used

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  • Preparation method of degradable magnesium alloy capillary tube for intravascular stent
  • Preparation method of degradable magnesium alloy capillary tube for intravascular stent
  • Preparation method of degradable magnesium alloy capillary tube for intravascular stent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: (1) select Mg-2.1Nd-0.2Zn-0.5Zr) (wt.%) alloy material, (2) machining a hot extrusion billet with an outer diameter of 10mm, a height of 25mm, and a center hole of 3mm; (3) At 380°C, hot extrusion is carried out according to the extrusion ratio of 40:1. During hot extrusion, the hot extruded capillary billet is subjected to rapid cooling treatment (compressed air cooling at room temperature); the shape of the extruded tube billet as attached figure 1 As shown, the length is 1000mm, the outer diameter is 3.5mm, and the wall thickness is 0.25mm. The tensile mechanical properties of the tube blank at room temperature are shown in the attached figure 2 (4) 4 passes of drawing at 390°C, the amount of drawing deformation in each pass is controlled at 20%, and the drawn pipe is as attached image 3 The grain size of the tubing is shown in the attached Figure 4 As shown; (5) After testing and drawing, the outer diameter of the pipe is 3mm, the wall thickness i...

Embodiment 2～6

[0035]

[0036] Compared with the prior patent ZL201010204716.5, the present invention can improve the uniformity of wall thickness, dimensional accuracy, and mechanical properties to a certain extent, and the dimensional accuracy can be stably within the range of ±0.01mm. Compared with the previous patent ZL201310327209.4, due to the shorter process flow, the quality stability of the product has been greatly improved, and the yield rate has reached 99%, resulting in a significant improvement in the actual application effect.

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Abstract

The invention discloses a preparation method of a degradable magnesium alloy capillary tube for an intravascular stent. The preparation method of the magnesium alloy capillary tube mainly comprises two working procedures of extruding and drawing. The preparation method comprises the following steps that 1, a magnesium alloy pipe hot extrusion blank is machined through a biodegradable magnesium alloy machine; 2, the magnesium alloy pipe hot extrusion blank obtained in the step 1 is subjected to hot extrusion to obtain a seamless magnesium alloy capillary blank pipe, and during extrusion, the extruded capillary blank pipe is subjected to rapid cooling treatment so as to control the grain size of the pipe; and 3, drawing the capillary blank tube obtained in the step 2 to obtain the magnesium alloy capillary tube for the intravascular stent. The preparation method is simple in process and low in processing cost, and the magnesium alloy pipe is good in surface quality, excellent in comprehensive mechanical property and high in geometric dimension precision; the outer diameter of the processed magnesium alloy small-diameter thin-wall pipe ranges from phi 1 mm to phi 4 mm, the wall thickness ranges from 0.1 mm to 0.2 mm, and the length of a single pipe is larger than or equal to 1000 mm.

Description

technical field [0001] The invention relates to a preparation method in the field of biomaterial molding, in particular to a preparation method for a degradable magnesium alloy capillary tube for vascular stents. Background technique [0002] At present, most clinically used vascular stents are made of inert metal materials, which have high stability and will not corrode and degrade after being implanted in the human body. Vascular stents made of inert metal materials need to be taken for life because they remain in the patient's body for a long time, and it is not convenient for secondary stent implantation. However, from a medical point of view, the application of vascular stents actually only requires short-term manual intervention. The blood vessels in the human body have self-repair function. After the stent is implanted, the blood vessel will achieve positive remodeling. After the disease is recovered, the stent is no longer needed. Therefore, the development and pre...

Claims

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Application Information

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IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 黄华袁广银
Owner SHANGHAI JIAO TONG UNIV
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