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Method of preparing degradable Fe-Zn alloy pipe for intravascular stent by electroforming

A vascular stent, fe-zn technology, applied in the fields of biomedical materials and electrochemical processing, to achieve the effects of good biocompatibility, good comprehensive mechanical properties, and improved mechanical properties

Active Publication Date: 2012-07-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the preparation of Fe-based biomedical Fe-Zn binary alloy pipes by electroforming technology.

Method used

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  • Method of preparing degradable Fe-Zn alloy pipe for intravascular stent by electroforming
  • Method of preparing degradable Fe-Zn alloy pipe for intravascular stent by electroforming

Examples

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Embodiment 1

[0022] a. prepare electroforming solution 2 in electroforming tank 1, electroforming solution 2 includes: deionized water 1000g, ferrous chloride 300g, zinc chloride 10g, sodium lauryl sulfate 0.02g, sodium citrate 20g, Ascorbic acid 1.5g, sodium chloride 15g, manganese chloride 5g;

[0023] b. adjust the pH of the solution with sodium hydroxide and hydrochloric acid to keep the pH at 3.5;

[0024] c. Using DC power supply for electroforming. The cathode mandrel 4 connected to the negative pole of the power supply is made of metal tin wire with a diameter of 1.8 mm, which is submerged in the electrolyte to generate a uniform Fe-Zn alloy electroforming layer 5 with an effective length of 40 mm. The one connected to the positive pole of the power supply is an annular pure iron anode 3 with a purity of 99.9%. The cathode mandrel 4 is placed on the central axis of the annular pure iron anode 3 to ensure the uniformity of the wall thickness of the electroformed pipe. The cathode...

Embodiment 2

[0029] a. prepare electroforming solution 2 in electroforming tank 1, electroforming solution 2 includes: deionized water 1000g, ferrous chloride 300g, zinc chloride 7g, sodium lauryl sulfate 0.02g, sodium citrate 20g, Ascorbic acid 1.5g, sodium chloride 15g, manganese chloride 5g;

[0030] b. adjust the pH of the solution with sodium hydroxide and hydrochloric acid to keep the pH at 3.5;

[0031] c. Using DC power supply for electroforming. The cathode mandrel 4 connected to the negative pole of the power supply is made of metal tin wire with a diameter of 1.8 mm, which is submerged in the electrolyte to generate a uniform Fe-Zn alloy electroforming layer 5 with an effective length of 40 mm. The one connected to the positive pole of the power supply is an annular pure iron anode 3 with a purity of 99.9%. The cathode mandrel 4 is placed on the central axis of the annular pure iron anode 3 to ensure the uniformity of the wall thickness of the electroformed pipe. The cathode ...

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Abstract

The invention discloses a method of preparing a degradable Fe-Zn alloy pipe for an intravascular stent by electroforming, belonging to the field of biological materials and electrochemical processing. The method is characterized in that a Fe-Zn alloy material is prepared by mutual-competition and codeposition processes of Fe ions and Zn ions, and the obtained alloy is fine in crystal grain and good in comprehensive mechanical performance; the thickness of an electroforming layer can be up to 7-150 microns, and the electroforming layer is served as an individual to be used independently after separating from a substrate, so that a seamless microcapillary pipe for a stent is directly obtained, and a regular pressure shaping procedure of a metal superfine pipe for laser-cutting of the stent is avoided; and a component ratio of a Fe-Zn alloy is changed by regulation of electroforming parameters, thermal treatment changes a microstructure of the Fe-Zn alloy, and the synergistic effect of both sides can regulate the degrading speed of the Fe-Zn alloy material in human body fluid or blood and improve the mechanical performance of the Fe-Zn alloy material. Therefore, according to the method provided by the invention, the Fe-Zn alloy pipe for the intravascular stent, with good biocompatibility, biological corrosion degradation performance and comprehensive mechanical performance is prepared.

Description

technical field [0001] The invention relates to a method for preparing biodegradable Fe-Zn alloy pipes by electroforming in an acidic solution, specifically referring to the process of dissolving anode iron, depositing ferrous ions and zinc ions in the solution on the surface of the cathode to make iron-zinc alloy profiles The method belongs to the fields of biomedical materials and electrochemical processing. Background technique [0002] At present, many implantable medical devices are permanent, and such devices often cause many complications. For example, permanent stainless steel vascular stents can cause restenosis of blood vessels at the implantation site, long-term local inflammatory reactions, etc. After the devices made of biomedical degradable materials complete their functional missions in the human body, they will be degraded and absorbed along with the human metabolic process, and will not cause long-term effects on the human body. used in patients. Biodegrad...

Claims

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Application Information

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IPC IPC(8): C25D1/02C25D3/56A61F2/82A61M29/00
Inventor 王伟强齐民王娟陆山
Owner DALIAN UNIV OF TECH
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