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Beta type titanium alloy for vascular stent

A technology of vascular stents and titanium alloys, applied in dilators, medical science, prostheses, etc., can solve the problems of low support force, local inflammatory response, high cost, etc., and achieve the effect of low cost, low elastic modulus, and high plasticity

Inactive Publication Date: 2004-04-21
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that during long-term use, toxic ions precipitated from stainless steel vascular stents such as Cr 6+ 、Ni 2+ Waiting in the body can cause a local inflammatory response
Although the titanium-nickel alloy stent has good biocompatibility, biomechanical compatibility, corrosion resistance, wear resistance and shape memory effect, its comprehensive performance needs to be improved. For example, the self-expanding titanium-nickel alloy stent contains potentially toxic elements such as Ni, It has low supporting force and its prefabricated capillary is difficult to process and high in cost, which limits its long-term clinical applicability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using 0-grade sponge titanium, atomic energy zirconium sponge, and Ti-15Mo and Ti-52Nb master alloys as raw materials, the electrodes are mixed and pressed into electrodes, and then smelted twice in a vacuum consumable electric arc furnace. The first smelting voltage is 32 volts and the smelting current 1300 amps; the secondary melting voltage is 35 volts, the melting current is 2200 amps; the vacuum degree before melting is not lower than 10 -2 Pa. The weight percent composition of the secondary alloy ingot is: 5% zirconium; 3% molybdenum, 25% niobium; the balance is Ti, and the molybdenum equivalent is 9.9. The ingot is forged at 1050°C. After several times of upsetting and drawing, it is first forged into a □42mm square bar, and then forged into a φ37mm round bar. Then go through continuous hot rolling at 950°C to make a thin rod of φ12.5mm (its original state performance is σ b =760MPa; σ O .2 = 730MPa; δ s =19%; Ψ=83.5%; E=67.4GPa). Finally, according to the r...

Embodiment 2

[0022] Other conditions are the same as those in Example 1, and the weight percent composition of the alloy ingot is: 5.5% zirconium; 3% molybdenum, 25% niobium; the balance is Ti, and the molybdenum equivalent is 9.9. The ingot is forged at 1000°C, and then hot-rolled in successive passes at 900°C to make a thin rod with a diameter of 12.5mm. The alloy of the present invention was obtained by performing solid solution treatment at 750°C for 1 hour and air cooling. The measured performance parameters of the alloy are:

[0023] σ b =665MPa; σ 0.2 =645MPa; δ s = 40%; Ψ = 81%; E = 68.5 GPa.

Embodiment 3

[0025]Other conditions are the same as those in Example 1, and the weight percent composition of the alloy ingot is: 6% zirconium; 3% molybdenum, 25% niobium, the balance is Ti, and the molybdenum equivalent is 9.9. The ingot is forged at 1100°C, and then hot-rolled in successive passes at 900°C to make a thin rod with a diameter of 12.5mm. The alloy of the present invention was obtained by performing solid solution treatment at 820° C. for 1 hour and air cooling. The measured performance parameters of the alloy are:

[0026] σ b =640MPa; σ 0.2 =570MPa; δ s = 45%; Ψ = 80.5%; E = 72.4 GPa.

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PUM

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Abstract

A beta-type Ti alloy used for the cardiovascular and cerebrovascular scaffold, the tubular scaffold of other organs, and surginal implant contains Zr (0.5-9.5 wt%), Mo (0.5-6.5), Nb (8.5-28.5), C (0-0.03), N (0-0.04), H (0-0.003), O (0-0.12) and Ti (rest). Its advantages are moderate strength, lower modulus of elasticity, high plasticity and low cost.

Description

technical field [0001] A β-type titanium alloy for vascular stents, which relates to a stent used for human heart and cerebrovascular stents and other medical intestines, gas and glands (such as various peripheral vascular diseases such as obliterative arteriosclerosis, vasculitis, etc., and body cavity stenosis) Tubular stent materials in sexual lesions such as esophageal cancer, prostatic hypertrophy, laryngotracheal stenosis, etc.) and β-type titanium alloys used in other surgical implant materials. Background technique [0002] In 1977, the research on PTCA (percutaneous transluminal coronary angioplasty) was first carried out abroad. Intravascular stent implantation is an interventional treatment technology developed on the basis of PTCA, and its design is mainly aimed at the prevention and treatment of acute vascular occlusion and chronic restenosis after PTCA. In recent years, intravascular stenting has developed into a mature heart and cerebrovascular treatment tech...

Claims

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Application Information

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IPC IPC(8): A61L27/06A61M29/00C22C14/00
Inventor 于振涛周廉王克光洪权赵彬牛金龙付艳艳王立新程何祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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