Method for preparing shape memory alloy intravascular stent based on automatic powder laying laser combination machining technology

A vascular stent and combined processing technology, which is applied in the field of medical device manufacturing, can solve problems such as size deformation, difficulty in realizing complex shapes, warping deformation, etc., and achieve the effect of reducing size error and trauma area

Active Publication Date: 2015-11-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +2
View PDF6 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned nickel-titanium alloy has many excellent characteristics, it has the following disadvantages: 1. The cost and difficulty of the processing and post-treatment process of the nickel-titanium alloy stent are higher than those of stainless steel 316L. The commonly used nickel-titanium alloy vascular stent is usually It is braided by shape memory alloy wire or shaped by laser engraving of shape memory alloy. It can be seen that such vascular stents have high production costs, limited stent structure design, and it is difficult to realize complex shapes of vascular stents. 2. The temperature sensitivity of Nitinol stent is very high, and obvious temperature changes will cause changes in the performance of the stent. Therefore, it has a certain impact on storage and transportation. condition requirements; at present, the commonly used nickel-titanium alloy stent is a self-expanding stent, which needs to cooperate with the delivery sheath to be transported t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing shape memory alloy intravascular stent based on automatic powder laying laser combination machining technology
  • Method for preparing shape memory alloy intravascular stent based on automatic powder laying laser combination machining technology
  • Method for preparing shape memory alloy intravascular stent based on automatic powder laying laser combination machining technology

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0050] Example 1

[0051] Step (1): Build a model

[0052] Establish the three-dimensional geometric model of the blood vessel stent in the computer, import the three-dimensional geometric model into the layered slice software for layered discretization, with a layer thickness of 30μm, obtain the cross-sectional profile data and form the scanning path;

[0053] Step (2): Preparation of the original powder material

[0054] A mixed powder material with an average particle size of 20μm is made from Ni-Ti metal powder and added Co metal powder at a mass ratio of 50:49:1.0 at a temperature of 120°C;

[0055] In this step, the Ni-Ti metal powder and the added Co metal powder can also be prepared according to other mass ratios, as long as the mass ratio of nickel, titanium, and Co meets 40-60:40-60:0.5-1.0 At the same time, the temperature during preparation is not limited to 120 degrees, as long as it is between 100-150 degrees Celsius; the average particle size of the mixed powder material...

Example Embodiment

[0060] Example 2

[0061] Step (1): Build a model

[0062] Establish the three-dimensional geometric model of the blood vessel stent in the computer, import the three-dimensional geometric model into the layered slicing software for layered discretization, with the layered thickness of 35μm, obtain the cross-sectional profile data and form the scanning path;

[0063] Step (2): Preparation of the original powder material

[0064] A mixed powder material with an average particle size of 15μm is made from Ni-Ti metal powder and added Cr metal powder at a mass ratio of 50.2:50:0.8 at a temperature of 120°C;

[0065] In this step, the Ni-Ti metal powder and the added Cr metal powder can also be prepared according to other mass ratios, as long as the mass ratio of nickel, titanium, and Cr satisfies 40-60:40-60:0.5-1.0 At the same time, the temperature during preparation is not limited to 120 degrees, as long as it is between 100-150 degrees Celsius; the average particle size of the mixed pow...

Example Embodiment

[0070] Example 3

[0071] Step (1): Build a model

[0072] Establish the three-dimensional geometric model of the blood vessel stent in the computer, import the three-dimensional geometric model into the layered slicing software for layered discretization, with a layer thickness of 40μm, obtain cross-sectional profile data and form a scanning path;

[0073] Step (2): Preparation of the original powder material

[0074] A mixed powder material with an average particle size of 10μm is made from Ni-Ti metal powder and added V metal powder at a mass ratio of 50:49.3:0.7 at a temperature of 130°C;

[0075] In this step, the Ni-Ti metal powder and the added V metal powder can also be prepared according to other mass ratios, as long as the mass ratio of nickel, titanium, and V satisfies 40-60:40-60:0.5-1.0 At the same time, the temperature during preparation is not limited to 130 degrees, as long as it is between 100-150 degrees Celsius; the average particle size of the mixed powder material ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Surface roughnessaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing a shape memory alloy intravascular stent based on the automatic powder laying laser combination machining technology. The method comprises the steps that according to a three-dimensional data model of a part to be machined, a high-energy laser beam melting and mixing powder system is utilized, the manner of laying powder layer by layer and carrying out fusing overlaying accumulation layer by layer is carried out until a intravascular stent blank of a mesh structure is formed finally, and then electrochemical polishing is carried out to reach the specific surface roughness requirement. The intravascular stent prepared through the method is based on the unique superelasticity function and the shape memory effect of shape memory alloy, and the occurrence rate of vascular restenosis of the intravascular stent in clinical application can be effectively reduced; by means of mechanical performance and living body environment simulation tests, the intravascular stent has the good biological tissue and blood compatibility and meets the medical application condition; furthermore, based on the advantage of superhigh manufacturing precision of the laser combination machining technology and protection of inert gas in the forming process, the problems of surface roughness, burr, oxidation and the like of a traditional intravascular stent in the preparing process are effectively solved.

Description

technical field [0001] The invention relates to a method for preparing a shape-memory alloy vascular stent based on an automatic powder-spreading laser combination processing technology, and belongs to the technical field of medical device manufacturing. Background technique [0002] After the 1990s, minimally invasive interventional treatment of vascular diseases began to be widely used. At present, it has been recognized as one of the most effective means for the treatment of cardiovascular and cerebrovascular diseases. According to different vascular lesions and requirements, researchers and doctors have jointly developed vascular stents with superior performance. There are many factors that determine the performance of vascular stents, among which the two most important are the selection of appropriate stent materials and the selection of appropriate stent manufacturing processes. [0003] At present, the most commonly used vascular stent is a nickel-titanium alloy vasc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B22F3/105B22F5/12B33Y10/00B33Y80/00
CPCY02P10/25
Inventor 李敏张仁良顾冬冬袁鹏鹏石齐民
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap