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Nickel-titanium alloy stent prepared based on metal additive manufacturing technology and preparation method thereof

A nickel-titanium alloy, manufacturing technology, applied in the field of nickel-titanium alloy stents and its preparation, can solve the problems of high phase transition temperature, cumbersome process, performance deviation of nickel-titanium alloy, etc.

Inactive Publication Date: 2021-03-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phase transition temperature of the nickel-titanium alloy stent prepared by the existing 3D printing technology is relatively high. When it is applied to the dredging and support of human body pipelines such as bile ducts and cardiovascular vessels, it is necessary to heat the nickel-titanium alloy stent to ensure that the nickel The titanium alloy stent is opened to open the blockage of the affected area. Not only is the process cumbersome, but also during the heat treatment process, it will affect the mechanical properties of the nickel-titanium alloy, resulting in deviations from the expected performance of the nickel-titanium alloy.

Method used

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  • Nickel-titanium alloy stent prepared based on metal additive manufacturing technology and preparation method thereof
  • Nickel-titanium alloy stent prepared based on metal additive manufacturing technology and preparation method thereof
  • Nickel-titanium alloy stent prepared based on metal additive manufacturing technology and preparation method thereof

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Effect test

Embodiment 1

[0060] A method for preparing a nickel-titanium alloy rhombic network stent based on metal additive manufacturing technology, comprising the following steps:

[0061] (1) Detect the structure of the patient's affected part according to the CT scan, obtain the three-dimensional data of the affected part structure, design the size and shape of the stent according to the three-dimensional data of the affected part structure, and obtain a simulated stent; the simulated stent is 80 mm long, 10 mm in diameter, and 90 μm in wall thickness;

[0062] (2) using computer software to slice the simulated support obtained in the step (1) to form material units, the thickness of each layer of material unit is 30 μm, to obtain a multi-layer simulated support model;

[0063] (3) Carry out 3D printing to the nickel-titanium alloy powder according to the multi-layer simulated bracket model in the step (2), to obtain the nickel-titanium alloy bracket; the content of Ni in the nickel-titanium alloy...

Embodiment 2

[0074] A method for preparing a nickel-titanium alloy S-shaped network stent based on metal additive manufacturing technology, comprising the following steps:

[0075] (1) Detect the structure of the affected part of the patient according to the CT scan, obtain the three-dimensional data of the affected part structure, design the size and shape of the stent according to the three-dimensional data of the affected part structure, and obtain a simulated stent; the simulated stent is 90 mm long, 12 mm in diameter, and 90 μm in wall thickness;

[0076] (2) using computer software to slice the simulated support obtained in the step (1) to form material units, the thickness of each layer of material unit is 30 μm, to obtain a multi-layer simulated support model;

[0077] (3) Carry out 3D printing to the nickel-titanium alloy powder according to the multi-layer simulation bracket model in the step (2), to obtain the nickel-titanium alloy bracket; the content of Ni in the nickel-titaniu...

Embodiment 3

[0086]A method for preparing a nickel-titanium alloy rhombic network vascular stent based on metal additive manufacturing technology, comprising the following steps:

[0087] (1) Detect the structure of the patient's affected part according to the CT scan, obtain the three-dimensional data of the affected part structure, design the size and shape of the stent according to the three-dimensional data of the affected part structure, and obtain a simulated stent; the simulated stent is 29 mm long, 3.5 mm in diameter, and 60 μm in wall thickness;

[0088] (2) using computer software to slice the simulated support obtained in the step (1) to form material units, the thickness of each layer of material unit is 30 μm, to obtain a multi-layer simulated support model;

[0089] (3) Carry out 3D printing to the nickel-titanium alloy powder according to the multi-layer simulated bracket model in the step (2), to obtain the nickel-titanium alloy bracket; the content of Ni in the nickel-titan...

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Abstract

The invention provides a nickel-titanium alloy stent prepared based on a metal additive manufacturing technology and a preparation method thereof, and belongs to the technical field of biological implant materials. According to the preparation method, the shape and size of the stent can be customized according to different patients, so that the stent is more targeted, the size is more appropriate,and the probability of displacement can be reduced; the performance of a formed part can be directly regulated and controlled by adjusting preparation parameters; the nickel-titanium alloy stent is prepared by adopting the metal additive manufacturing technology, so that the forming size precision of the nickel-titanium alloy stent is high; by adjusting the proportion of components in nickel-titanium alloy and technological parameters of the metal additive manufacturing technology, the phase inversion temperature of the prepared nickel-titanium alloy stent is close to the temperature of a human body, and the nickel-titanium alloy stent can be automatically unfolded after entering the human body to space apart the blocking at an affected part; and results of the embodiment show that the nickel-titanium alloy stent prepared through the preparation method can be completely unfolded at the temperature of 37 DEG C after being compressed.

Description

technical field [0001] The invention relates to the technical field of biological implant materials, in particular to a nickel-titanium alloy stent prepared based on metal additive manufacturing technology and a preparation method thereof. Background technique [0002] In today's society, more and more people have diseases of the pipelines in the human body such as bile ducts and cardiovascular systems. For pipeline blockage or functional failure, internal stents are commonly used in medicine to dredge and support. NiTi alloys are widely used in bioimplantation materials due to their unique superelasticity, shape memory, good biocompatibility and corrosion resistance. The unique mechanical properties of NiTi alloy come from its two phase structures: B with monoclinic structure 19 ’The martensite phase exhibits shape memory, and the B2 austenite phase with a cubic structure has superelasticity, and the austenite phase can transform with martensite under the influence of temp...

Claims

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Application Information

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IPC IPC(8): B22F10/28B22F5/00C22C19/03B33Y10/00B33Y50/02B33Y80/00B33Y70/00A61L31/02
CPCA61L31/022B22F5/00B33Y10/00B33Y50/02B33Y70/00B33Y80/00C22C19/03
Inventor 王江任忠鸣陈超越任虔泓帅三三胡涛
Owner SHANGHAI UNIV
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