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Nickel-titanium alloy preparation method for improving radial stability and medical device

A nickel-titanium alloy and stability technology, which is applied in the preparation method of nickel-titanium alloy and the field of medical devices, can solve the problems of uneven microscopic defects of the stent structure, and the effect of improving the cycle stability is not obvious, so as to achieve improved cycle stability and low cost , Improve the effect of fatigue resistance

Inactive Publication Date: 2021-06-29
江苏盛玛特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nickel-titanium alloy tubes prepared by the two methods will be affected by laser thermal stress, resulting in uneven internal structure of the stent or microscopic defects.
In order to improve the cycle stability of nickel-titanium alloy stents, the effect of aging treatment on cycle stability is not obvious

Method used

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  • Nickel-titanium alloy preparation method for improving radial stability and medical device
  • Nickel-titanium alloy preparation method for improving radial stability and medical device
  • Nickel-titanium alloy preparation method for improving radial stability and medical device

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Effect test

Embodiment 1

[0037] A nickel-titanium alloy material is selected to make a nickel-titanium stent. First, put the NiTi stent into a muffle furnace at 650 °C for 1 h for annealing. Recrystallize the internal structure of the nickel-titanium stent through annealing treatment, so that the internal structure of the nickel-titanium stent is completely uniform, eliminate defects such as dislocations in the nickel-titanium stent due to laser thermal stress during fabrication, and make the two-phase nano-scale precipitates melt back . Then put it into a muffle furnace at 300° C. for 20 hours of aging treatment, and make the nano two-phase precipitates uniformly disperse and precipitate again, and the medical device of the present invention can be obtained.

Embodiment 2

[0039] A nickel-titanium alloy material is selected to make a nickel-titanium stent. First, put the NiTi stent into a muffle furnace at 700°C for 0.5h for annealing. The annealing treatment recrystallizes the internal structure of the nickel-titanium stent, makes the internal structure of the nickel-titanium stent completely uniform, eliminates defects such as dislocations inside the stent, and makes the two-phase nanoscale precipitates dissolve back. Then put it into a muffle furnace at 300° C. for 20 hours of aging treatment, and make the nano two-phase precipitates uniformly disperse and precipitate again, and the medical device of the present invention can be obtained.

Embodiment 3

[0041] A nickel-titanium alloy material is selected to make a nickel-titanium stent. First, put the NiTi stent into a muffle furnace at 700°C for 0.5h for annealing. The annealing treatment recrystallizes the internal structure of the nickel-titanium stent, makes the internal structure of the nickel-titanium stent completely uniform, eliminates defects such as dislocations inside the stent, and makes the two-phase nanoscale precipitates dissolve back. Then put it into a muffle furnace at 250° C. for 24 hours of aging treatment, and make the nano two-phase precipitates uniformly disperse and precipitate again, and the medical device of the present invention can be obtained.

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Abstract

The invention discloses a nickel-titanium alloy preparation method for improving the radial stability and a medical device. A nickel-titanium alloy stent with microdefects in a preset structure is subjected to shaping and post-treatment through a multi-step heat treatment process method. The method comprises the following steps: performing annealing treatment to enable the internal structure of the nickel-titanium alloy stent to be recovered, recrystallized and shaped, eliminating the defects of dislocation and the like in the stent, enabling the internal structure of the nickel-titanium alloy stent to be uniform, and re-dissolving a Ni-rich precipitated phase; carrying out strain cycle shrinkage on the stent in the radial direction; and finally, carrying out low-temperature aging treatment on the stent, so that a nanoscale component non-uniform structure is uniformly formed in the alloy, and the anti-fatigue performance of radial cyclic shrinkage deformation of the nickel-titanium alloy stent is remarkably improved.

Description

technical field [0001] The invention relates to the field of biomedical metal materials, in particular to a method for preparing a nickel-titanium alloy with improved radial stability and a medical device. Background technique [0002] Nickel-titanium (TiNi) shape memory alloy has been widely used in the medical field due to its good shape memory effect and superelastic properties, excellent corrosion resistance and good biocompatibility. Among them, the nickel-titanium memory alloy stent is one of the most important applications of nickel-titanium memory alloy in the field of biomedicine. The superelastic cyclic stability of the nickel-titanium memory alloy stent, that is, the anti-fatigue performance under the condition of superelastic deformation, has a great influence on the safety of the stent during the large compression before implantation and the pulsating load after implantation. Significant influence. [0003] Among them, the large compression before implantation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C21D1/26C21D9/00A61F2/82
CPCC22F1/10C21D1/26C21D9/0068A61F2/82C21D2261/00
Inventor 刘晶郝建斌郝世杰
Owner 江苏盛玛特新材料科技有限公司
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