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Preparation method of superplastic zinc alloy stent material

A zinc alloy and superplastic technology, applied in the fields of medical devices and biomedical materials, to achieve the effects of easy processing and molding, promoting the recovery and maintenance of normal function of vascular endothelium, and improving mechanical properties

Active Publication Date: 2019-04-12
SHANDONG RIENTECH MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to make the following improvements aimed at the deficiencies in the plastic deformation capacity of magnesium and zinc alloys in the prior art and the improvement of mechanical properties:

Method used

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  • Preparation method of superplastic zinc alloy stent material
  • Preparation method of superplastic zinc alloy stent material
  • Preparation method of superplastic zinc alloy stent material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Zinc-iron-copper alloy

[0037] The zinc-based alloy material of this embodiment is a zinc-iron-copper alloy, and the preparation process specifically includes the following steps:

[0038] 1) According to the mass percentage, 12wt% Fe, 1.8wt% Cu and the rest Zn (total impurity content 6 (1 vol.%) and CO 2 In the atmosphere, add high-purity graphite crucible to mix and smelt to obtain zinc-based alloy.

[0039] 2) After smelting, extrude the obtained zinc-based alloy into rods with a diameter of 100 mm and a length of 50 cm.

[0040] 3) After multiple annealing (temperature 200°C-500°C, 30min), the obtained rod is drilled and finally drawn to form a capillary with a diameter of 1.58mm and a wall thickness of 0.127mm, which is engraved by a femtosecond laser (engraving see flower type figure 1 ), intended for coronary stents.

[0041] Effect verification:

[0042] The zinc-based alloy material prepared by the above method has a yield strength of about...

Embodiment 2

[0045] Embodiment 2: zinc-iron-copper alloy

[0046] The zinc-based alloy material in this embodiment is a zinc-iron-copper alloy, which contains 0.2wt% iron, 0.5wt% copper, the balance is zinc, and the total impurity content is <0.001wt%. The preparation process is as follows:

[0047] 1) Put the raw materials into the smelting furnace according to the mass percentage and smelt them under the protection of inert gas to obtain a rod with a diameter of 100mm and a length of 500mm;

[0048] 2) Cut the rods into zinc alloy rods with a diameter of 8~10mm;

[0049] 3) Draw the medium bar in 2) to a thin cylindrical bar with a diameter of 3mm

Embodiment 3

[0050] Embodiment 3: zinc-copper alloy

[0051] The zinc-based alloy material in this embodiment is a zinc-copper alloy, which contains 0.80wt% copper, the balance is zinc, and the total impurity content is <0.001%. The preparation process is as follows (method 1):

[0052] 1) Copper and zinc are mixed and smelted in a high-purity graphite crucible according to the mass percentage, and the SF 6 and CO 2 Protected under the mixed gas atmosphere;

[0053] 2) Transfer the alloy melt to the mold, place a high-energy ultrasonic probe, and cool down step by step to form a rod with a diameter of 100mm and a length of 500mm;

[0054] 3) Heated and extruded into zinc alloy rods with a diameter of 8~10mm;

[0055] 4) 50 wires are drawn in each pass, and the thin alloy rod in 2) is drawn to a thin wire with a diameter of 3mm;

[0056] 5) Anneal the filament at 250°C for 10min.

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Abstract

The invention provides a preparation method of a superplastic zinc alloy stent material. The method specifically comprises: performing material first-principles calculation to obtain alloy componentsdirected at different implanting positions, wherein the main alloy elements include iron (Fe), copper (Cu) and the like, smelting the alloy components in a heating device to obtain alloy melt, subjecting the alloy melt to high-energy ultrasonic treatment, then performing stepwise cooling in a mold to obtain zinc alloy ingot casting, and successively performing extrusion, drawing and annealing to obtain a zinc alloy cylindrical bar with a superplastic characteristic. The alloy properties and components required in different parts are obtained through the first-principles calculation. The alloymelt realizes the purpose of degassing, impurity removal and grain refinement through the high-energy ultrasonic treatment. The crystallization process is more balanced by the stepwise cooling in themold. The blood vessel stent processed by zinc alloy material has suitable support force, good compliance, stable plastic deformation ability and excellent degradability, and can be applied to blood vessels, lumens and orthopedic implanting.

Description

technical field [0001] The invention belongs to the fields of medical equipment and biomedical materials. In particular, it relates to a superplastic degradable zinc alloy intravascular and intracavity support material, a bone plate bone nail material and a preparation method. Background technique [0002] Coronary atherosclerotic heart disease is one of the important causes of human death. At present, more than 2 million coronary heart disease patients in the world need percutaneous transluminal coronary angioplasty (PTCA), of which 70 Percent of PTCA operations need to implant vascular stents, but the restenosis rate after 6 months is as high as 20% to 30%, and about 10% of the patients need to implant stents again, which brings huge economic and psychological benefits to patients. on the burden. [0003] One of the mechanisms causing restenosis is elastic recoil. The human coronary artery is a muscular artery, and its inner elastic layer and outer elastic layer contain ...

Claims

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Application Information

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IPC IPC(8): A61L31/14A61L31/02A61L31/16C22C18/00C22C18/02C22C1/02C22F1/16
CPCA61L31/022A61L31/14A61L31/16C22C1/02C22C18/00C22C18/02C22F1/165A61L2300/102A61L2300/404A61L2300/412
Inventor 张海军王鲁宁周超冯相蓺张军伟宋彩霞崔晓珊徐凯丽赵彦伟万国江尹玉霞鲁守涛段翠海侯文博刘光
Owner SHANDONG RIENTECH MEDICAL TECH
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