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Shape memory alloy intravascular stent based on auxetic honeycomb and preparation method thereof

A memory alloy and vascular stent technology, which is applied in the field of medical devices, can solve problems such as fatigue life that cannot meet expectations, poor mechanical properties of vascular stents, and metal stents, etc., to achieve easy manufacturing and promotion, clear geometric parameters, and improved compliance performance Effect

Inactive Publication Date: 2021-11-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the high-end vascular stents needed each year are imported, and the materials are mostly made of medical stainless steel 316L or degradable materials. The biocompatibility of medical stainless steel is poor, and there is a risk of patient allergies, while the mechanical properties of vascular stents made of degradable materials Poor, prone to brittle fracture during operation, fatigue life cannot meet expectations, and will directly fail in severe cases. The current degradable stent technology is far from the effect of metal stents

Method used

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  • Shape memory alloy intravascular stent based on auxetic honeycomb and preparation method thereof
  • Shape memory alloy intravascular stent based on auxetic honeycomb and preparation method thereof
  • Shape memory alloy intravascular stent based on auxetic honeycomb and preparation method thereof

Examples

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Embodiment 1

[0057] (1) Use the commercial 3D modeling software UG to draw the 3D data model of the shape memory alloy vascular single tube stent based on the auxetic honeycomb. The length of the first basic rod 1 is 1.2 mm, the length of the second basic rod 2 is 0.5 mm, the width of the rods is 0.1 mm, and the thickness is 0.1 mm. The first basic rod 1 and the second basic rod 2 are The four included angles α formed are the same size, which is 45°; the included angle β formed between two basic rods (2) is the same size, which is 90°; the cross-section of the basic rods is square, and there are 16 unit cells in the circular array , and the number of support layers is 5.

[0058] (2) Select a nickel-titanium alloy thin-walled pipe with a thickness of 0.1mm and a Ti content of 50.5%, input the model data into the computer control system, and set appropriate cutting process parameters. The laser power is 100W, and the pulse width is 20μs. The pulse frequency is 8000Hz, the cutting speed is ...

Embodiment 2

[0060] (1) Use the commercial 3D modeling software UG to draw the 3D data model of the shape memory alloy vascular single tube stent based on the auxetic honeycomb. The length of the first basic rod 1 is 1.2mm, the length of the second basic rod 2 is 0.5mm, the width of the rods is 0.1mm, and the thickness is 0.1mm. The first basic rod 1 and the second basic rod 2 are composed of The four included angles α are the same in size, 45°, the included angle β formed between the second basic rods 2 is the same in size, 90°, the cross-section of the basic rods is circular, and there are 16 unit cells in the circumferential array , the number of support layers is 5, and the drawn 3D data model is converted into STL format data and exported.

[0061] (2) Import the STL format data obtained in the previous step into the commercial model dissection software Simplify 3D, carry out digital cross-sectional slices to the three-dimensional data model, and obtain the slice data of the three-dim...

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Abstract

The invention discloses a shape memory alloy intravascular stent based on an auxetic honeycomb and a preparation method thereof. The intravascular stent consists of a plurality of periodic unit cells, and each basic unit cell is of an inwards-concave honeycomb structure with the auxetic effect. By combining the auxetic honeycomb structures and shape memory alloy, the integrated intravascular stent is prepared by using laser cutting and additive manufacturing technologies, so that the overall mechanical property of the intravascular stent structure is improved, and the intravascular stent structure has excellent flexibility, bending property and fatigue life and is far superior to a traditional net-shaped structure and a traditional winding structure; and the multi-tube design can better adapt to the complex working environment of human blood vessels, and the whole stent is long in service period and excellent in performance and has wide application prospects in the field of medical instruments.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to an auxetic honeycomb-based shape memory alloy vascular stent and a preparation method thereof. Background technique [0002] The incidence of cardiovascular diseases has increased significantly, and the incidence of vascular stenosis has shown a "blowout" trend. Patients' demand for stents continues to increase, and the market prospect of vascular stents is broad. At present, most of the high-end vascular stents needed each year are imported, and the materials are mostly made of medical stainless steel 316L or degradable materials. The biocompatibility of medical stainless steel is poor, and there is a risk of patient allergies, while the mechanical properties of vascular stents made of degradable materials Poor, it is prone to brittle fracture during operation, the fatigue life cannot meet expectations, and it will directly fail in severe cases. The current degradable st...

Claims

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Application Information

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IPC IPC(8): A61F2/844A61F2/90A61F2/91B33Y10/00B33Y50/00B33Y80/00
CPCA61F2/844A61F2/90A61F2/91B33Y10/00B33Y50/00B33Y80/00A61F2210/0014A61F2240/001
Inventor 韩宾李芸瑜王泽雨刘晗张琦
Owner XI AN JIAOTONG UNIV
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