Three-dimensional vector expansion cardiovascular stent with memory effect based on 4D printing and manufacturing method

Abstract

The invention discloses a three-dimensional vector expansion cardiovascular stent with a memory effect based on a 4D printing and manufacturing method. The stent is made by metalprinting a metal material with a vector expansion effect and comprises multiple net annular wires uniformly arranged in the axial direction and composed of inwards concave hexahedral grid basic units, multiple layers of the net annular wires are arranged in an array to constitute a stent main body, and an upper supporting ring and a lower supporting ring are connected to the net annular wires at the two ends of the stent main body respectively and fix the stent main body. The manufacturing method of the three-dimensional vector expansion cardiovascular stent comprises the steps of controlling the energy density oflaser area selecting melting, adjusting austenite-martensite phase change temperature, using different energy densities to form different parts of a basal body structure and achieving deformation adjustability of a formed cardiovascular stent based on temperature dependence change. Thus different parts of the stent have different expansion coefficients based on temperatures, so that the stent better adapts to the specificity and the thermal expansion of the shape of the blood vessel.

Description

technical field [0001] The invention belongs to the field of medical vascular stents, and relates to a 4D printing-based three-dimensional vector expandable vascular stent with memory effect and a manufacturing method. Background technique [0002] The so-called 4D printing technology is to add the "time" element to the concept of traditional 3D printing, and the printed object can self-adjust in shape over time. This technology does not even need a printing machine, it can directly make the material rapid prototyping, which can be called a revolutionary technology. 4D printing technology will be applied to furniture, bicycles, cars and even medical fields. [0003] Due to its shape memory effect and superelastic behavior, NiTi alloy has been widely used in biomedicine, aerospace, and intelligent robots. Laser selective melting 3D printing NiTi alloy hip femoral stem prosthesis with memory effect forms a new method of 4D printing hip prosthesis. [0004] Vascular stent is...

AI Technical Summary

Problems solved by technology

However, there are many limitations in the existing products, such as: clogging the fluid in the blood vessel, resulting in thrombus, damage to the blood vessel wall by the small metal edge, and narrowing of the inner hole of the stent after implantation

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