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Precise machining method for capillary tube for biodegradable magnesium alloy intravascular stent

A magnesium alloy blood vessel and precision machining technology, which is applied in the field of precision machining of capillary tubes for degradable magnesium alloy stents, can solve the problems of poor plasticity at room temperature of magnesium alloys and processing and production, and achieve excellent mechanical properties, high processing efficiency, The effect of low processing cost

Active Publication Date: 2013-11-20
SHANGHAI INNOVATON MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plasticity of magnesium alloy at room temperature is very poor, and conventional parts such as plates, rods, wires, etc. can be realized by simple thermal processing, but high-quality fine magnesium alloy capillary tubes for intravascular stents cannot be produced by simple processing in a few steps

Method used

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  • Precise machining method for capillary tube for biodegradable magnesium alloy intravascular stent

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Experimental program
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Effect test

Embodiment 1

[0028] This embodiment relates to a precision machining method for a capillary for a biodegradable magnesium alloy intravascular stent, the method comprising the following steps:

[0029] Step 1: Under the condition of argon gas atmosphere in a tube vacuum furnace at a temperature of 250-450°C, the extruded Mg-Nd-Zn-Zr magnesium alloy rod is subjected to stress-relief annealing for 30-90 minutes to obtain a φ20×6.5mm the tube blank;

[0030] Step 2: Spray lubricant on the inner and outer walls of the mold and the billet, and extrude the billet into a seamless extruded pipe of φ9×1.0mm at a temperature of 300-450°C and a speed of 1-10mm / s The average grain size is measured to be about 10 μm, then washed with ethanol, dried or blown dry, and subjected to stress relief annealing at 250-450°C for 30-90 minutes;

[0031] Step 3, the annealed seamless extruded tube billet is rolled in multiple passes with a three-roll cold rolling mill, the deformation of each pass is 5-15%, and 25...

Embodiment 2

[0035] This embodiment relates to a precision machining method for a capillary for a biodegradable magnesium alloy intravascular stent, the method comprising the following steps:

[0036] Step 1: Under the condition of argon gas atmosphere in a tube vacuum furnace at a temperature of 250-450°C, the extruded Mg-Nd-Zn-Zr magnesium alloy rod is subjected to stress-relief annealing for 30-90 minutes to obtain a φ20×6.5mm the tube blank;

[0037] Step 2: Spray lubricant on the inner and outer walls of the mold and the tube blank, and extrude the tube blank into a seamless extruded tube of φ8×0.6mm at a temperature of 300-450°C and a speed of 1-10mm / s The average grain size is measured to be about 6 μm, then washed with ethanol, dried or blown dry, and subjected to stress relief annealing at 250-450°C for 30-90 minutes;

[0038] Step 3, the annealed seamless extruded tube billet is rolled in multiple passes with a three-roll cold rolling mill, the deformation of each pass is 5-15%,...

Embodiment 3

[0042] This embodiment relates to a precision machining method for a capillary for a biodegradable magnesium alloy intravascular stent, the method comprising the following steps:

[0043] Step 1: Under the condition of argon gas atmosphere in a tube vacuum furnace at a temperature of 250-450°C, the extruded Mg-Nd-Zn-Zr magnesium alloy rod is subjected to stress relief annealing for 30-90 minutes to obtain a φ20×6.5mm the tube blank;

[0044]Step 2: Spray lubricant on the inner and outer walls of the mold and the billet, and extrude the billet into a seamless extruded pipe of φ7×0.5mm at a temperature of 300-450°C and a speed of 1-10mm / s The average grain size is measured to be about 5 μm, then washed with ethanol, dried or blown dry, and subjected to stress relief annealing at 250-450°C for 30-90 minutes;

[0045] Step 3, the annealed seamless extruded tube billet is rolled in multiple passes with a three-roll cold rolling mill, the deformation of each pass is 5-15%, and 250-...

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Abstract

The invention discloses a precise machining method for a capillary tube for a biodegradable magnesium alloy intravascular stent. The method comprises the following steps of: step 1, performing stress relief annealing and machining on a magnesium alloy extrusion bar to obtain a tube blank; step 2, extruding the tube blank to obtain a seamless extrusion tube blank, and performing stress relief annealing; step 3, performing multi-pass rolling and annealing on the annealed seamless extrusion tube blank to obtain a thin tube blank; and step 4, performing multi-pass drawing and annealing on the thin tube blank to obtain the capillary tube for the biodegradable magnesium alloy intravascular stent. The capillary tube produced by the method disclosed by the invention is accurate in dimension (a wall thickness error is not greater than 5%), can be more than 1 metre long, is high in surface quality, uniform in matrix structure, excellent in mechanical property, low in machining cost and high in machining efficiency, and can be subjected to industrialized batch production.

Description

technical field [0001] The invention relates to the field of biomaterial processing, in particular to a precision processing method for capillary tubes used in degradable magnesium alloy intravascular stents. Background technique [0002] In the field of cardiovascular disease treatment, interventional endovascular stent therapy has become the most important means. At present, most clinical interventional stents are mainly made of non-degradable metal materials, such as stainless steel, nickel-titanium alloy or cobalt-chromium alloy, and stents made of degradable magnesium alloy materials have not yet entered clinical application. These permanent stents will have many negative effects on the human body, such as intimal hyperplasia and local inflammation. Magnesium alloy has good biocompatibility and can be gradually degraded and absorbed in the body, showing its great application potential as a degradable biomaterial. However, the plasticity of magnesium alloy at room temp...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21B37/00C22F1/06C21D8/10
Inventor 袁广银刘飞朱永奎丁文江
Owner SHANGHAI INNOVATON MEDICAL TECH CO LTD
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