Method and system for constructing 3D printing model of titanium alloy stent

Abstract

The invention provides a titanium alloy stent 3D printing model construction method and system. The titanium alloy stent 3D printing model construction method comprises the steps that slice images of all slice layers in a stent simulation model are collected; extracting a support contour of each slice layer and a support gap between adjacent slice layers from each slice image; and according to the shape features of the supporting gaps, interlayer compensation is conducted on the standard printing intervals of the titanium alloy stent, compensation values of the printing intervals between the adjacent slice layers are obtained, and then interlayer constraint is conducted on the 3D printing strategy of the titanium alloy stent according to the compensation values of all the printing intervals and the supporting contours of the slice layers. Collaborative constraint conditions of layered printing of the titanium alloy stent are obtained; all the slice layers are integrated into a 3D printing model of the titanium alloy stent on the basis of collaborative constraint conditions of layered printing, and then layered printing is conducted on the titanium alloy stent through the 3D printing model; based on the scheme, layered improvement of the supporting stability in 3D printing of the titanium alloy support can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of titanium alloy stent production, and more specifically, to a method and system for constructing a 3D printing model of a titanium alloy stent. Background Art

[0002] Due to its excellent mechanical properties, corrosion resistance and biocompatibility, titanium alloy is widely used in fields such as aerospace, medical implants and high-performance structural components. In the medical field, titanium alloy stents are widely used in orthopedics, dentistry and other implants. Especially in personalized medicine, titanium alloy stents have important application value.

[0003] In traditional 3D printing technology, the printing interval between adjacent slice layers of a titanium alloy stent usually adopts fixed parameter settings. This approach fails to fully consider the actual gap requirements between different slice layers. The printing characteristics, support structure and material fluidity of each layer may vary due to factors such as layer height, printing path and printing speed. Due to the fixed printing interval setting, there may be too large a gap between some layers, resulting in ineffective bonding of the molten material and insufficient interlayer bonding force, ultimately affecting the overall strength and stability of the stent. Therefore, how to achieve hierarchical improvement of support stability in 3D printing of titanium alloy stents has become a difficult problem faced by the industry. Summary of the Invention

[0004] The present application provides a method and system for constructing a 3D printing model of a titanium alloy stent, which can achieve hierarchical improvement of support stability in 3D printing of titanium alloy stents.

[0005] In a first aspect, the present application provides a method for constructing a 3D printing model of a titanium alloy stent, including: Constructing the titanium alloy stent to be printed into a stent simulation model, dividing the stent simulation model into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then collecting slice images of each slice layer; Determining the distribution information of support points in the stent simulation model through the support structure of the titanium alloy stent, and extracting the support contour of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information; Performing interlayer compensation on the standard printing interval of the titanium alloy stent according to the shape characteristics of each support gap to obtain the compensation value of the printing interval between adjacent slice layers, and then performing interlayer constraint on the 3D printing strategy of the titanium alloy stent according to the compensation values of all printing intervals and the support contour of each slice layer to obtain the collaborative constraint conditions for hierarchical printing of the titanium alloy stent; Integrating all slice layers into a 3D printing model of the titanium alloy stent based on the collaborative constraint conditions for hierarchical printing.

[0006] In some embodiments, determining the distribution information of the support points in the stent simulation model based on the support structure of the titanium alloy stent specifically includes: Obtain the support structure of the titanium alloy stent; Perform a mechanical analysis on the support structure to obtain multiple support points of the titanium alloy stent, and then determine the distribution coordinates and support forces of each support point; Determine the distribution information of the support points in the stent simulation model based on all the distribution coordinates and support forces.

[0007] In some embodiments, extracting the support contour of each slice layer and the support gap between adjacent slice layers from each slice image based on the distribution information of the support points specifically includes: For each slice layer, extract the support features of the slice layer from the distribution information of the support points; Extract the support contour of the slice layer from the slice image of the slice layer through the support features, and then obtain the support contours of each slice layer; For the support gap between each group of adjacent slice layers, obtain the support features of each slice layer in the adjacent slice layers; Determine the support gap between adjacent slice layers through all the support features, and then obtain the support gaps between each group of adjacent slice layers.

[0008] In some embodiments, performing layer - by - layer compensation on the standard printing interval of the titanium alloy stent according to the shape features of each support gap to obtain the compensation value of the printing interval between adjacent slice layers specifically includes: Obtain the standard printing interval between adjacent slice layers of the titanium alloy stent under the current printing process; For each group of adjacent slice layers, extract the shape features of the support gap between the adjacent slice layers; Determine the correlation factor between the printing interval and the shape of the support gap based on the shape features; Adjust the standard printing interval according to the correlation factor to obtain the compensation value of the printing interval between adjacent slice layers, and then obtain the compensation values of the printing intervals between each group of adjacent slice layers.

[0009] In some embodiments, performing layer - by - layer constraint on the 3D printing strategy of the titanium alloy stent according to the compensation values of all printing intervals and the support contours of each slice layer to obtain the collaborative constraint conditions for layer - by - layer printing of the titanium alloy stent specifically includes: Obtain the standard 3D printing strategy of the titanium alloy stent under the current printing process; For each slice layer, extract the standard printing path of the slice layer and the standard intervals before and after layer - by - layer printing from the 3D printing strategy; The stability of the standard interval is adjusted by the compensation value of the printing interval before and after layer slicing to obtain the corrected interval of the slice layer before and after printing; The support stability of the standard printing path is adjusted by the support profile of the slice layer to obtain the stable path of the slice layer during printing; The collaborative constraint conditions for the layer-by-layer printing of the titanium alloy stent are determined according to the stable path and all the corrected intervals.

[0010] In some embodiments, integrating all the slice layers into a 3D printing model of a titanium alloy stent based on the collaborative constraint conditions of the layer-by-layer printing specifically includes: Taking the collaborative constraint conditions of the layer-by-layer printing as the integration conditions between adjacent slice layers, and performing interlayer integration on all the slice layers to obtain a 3D printing model of the titanium alloy stent.

[0011] In some embodiments, a computer scanning device is used to collect the slice images of each slice layer.

[0012] In a second aspect, the present application provides a system for constructing a 3D printing model of a titanium alloy stent, including: A layer-by-layer acquisition module, configured to construct a stent simulation model of the titanium alloy stent to be printed, divide the stent simulation model into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then collect the slice images of each slice layer; A processing module, configured to determine the distribution information of support points in the stent simulation model through the support structure of the titanium alloy stent, and extract the support profile of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information; The processing module is further configured to perform interlayer compensation on the standard printing interval of the titanium alloy stent according to the shape characteristics of each support gap to obtain the compensation value of the printing interval between adjacent slice layers, and then perform interlayer constraint on the 3D printing strategy of the titanium alloy stent according to the compensation values of all the printing intervals and the support profiles of each slice layer to obtain the collaborative constraint conditions for the layer-by-layer printing of the titanium alloy stent; An execution module, configured to integrate all the slice layers into a 3D printing model of the titanium alloy stent based on the collaborative constraint conditions of the layer-by-layer printing.

[0013] In a third aspect, the present application provides a computer device, which includes a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned method for constructing a 3D printing model of a titanium alloy stent.

[0014] Fourthly, the present application provides a computer-readable storage medium storing instructions or codes, which, when running on a computer, cause the computer to execute the above-mentioned method for constructing a 3D printing model of a titanium alloy stent.

[0015] The technical solutions provided by the disclosed embodiments of the present application have the following beneficial effects: In a method and system for constructing a 3D printing model of a titanium alloy stent provided by the present application, the titanium alloy stent to be printed is constructed into a stent simulation model, and the stent simulation model is divided into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then the slice images of each slice layer are collected; the distribution information of the support points in the stent simulation model is determined through the support structure of the titanium alloy stent, and the support contour of each slice layer and the support gap between adjacent slice layers are extracted from each slice image according to the distribution information of the support points; the standard printing interval of the titanium alloy stent is compensated layer by layer according to the shape characteristics of each support gap to obtain the compensation value of the printing interval between adjacent slice layers, and then the 3D printing strategy of the titanium alloy stent is layer-by-layer constrained according to the compensation values of all printing intervals and the support contour of each slice layer to obtain the collaborative constraint conditions for the layered printing of the titanium alloy stent; all slice layers are integrated into a 3D printing model of the titanium alloy stent based on the collaborative constraint conditions for the layered printing.

[0016] It can be seen that in the present application, all slice layers are integrated into a 3D printing model of a titanium alloy stent based on the collaborative constraint conditions for layered printing; firstly, by extracting the support contour of each slice layer and the support gap between adjacent slice layers, the structural relationship and its support effect between each slice layer can be accurately captured, so as to be able to judge whether the support structure can be evenly distributed and fully support each part of the stent, avoiding problems such as displacement, distortion or cracks during the printing process due to insufficient support, which helps to adjust the printing interval through layer-by-layer compensation later, optimize the printing accuracy, enhance the printing quality, so as to be able to realize the optimization of the support structure between slice layers, effectively improve the support stability, and further improve the reliability and accuracy of the 3D printing of the titanium alloy stent; then, by combining the support contour of each slice layer and the support gap between adjacent slice layers to improve the 3D printing strategy layer by layer, the printing path and support position can be optimized without affecting the main structure of the stent, ensuring the balance and stability between each layer, and determining the stable strategy helps to avoid deformation, collapse or position deviation caused by uneven printing interval or insufficient support, thus ensuring the stability of the support during the printing process. At the same time, the collaborative constraint conditions for layered printing can more finely adjust the printing parameters, improve the support effect, and ensure the stability of the titanium alloy stent during the printing process, thus significantly improving the printing accuracy and the mechanical properties of the final stent; in summary, the hierarchical improvement of the support stability in the 3D printing of the titanium alloy stent can be realized based on the above scheme. Brief Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is an exemplary flowchart of a method for constructing a 3D printing model of a titanium alloy stent according to some embodiments of the present application; Figure 2 is a schematic flowchart of the 3D printing process of a titanium alloy stent according to some embodiments of the present application; Figure 3 is a schematic flowchart of determining a compensation value according to some embodiments of the present application; Figure 4 is a schematic structural diagram of a system for constructing a 3D printing model of a titanium alloy stent according to some embodiments of the present application; Figure 5 is a schematic structural diagram of a computer device for implementing a method for constructing a 3D printing model of a titanium alloy stent according to some embodiments of the present application. Detailed Description of the Embodiments

[0019] To better understand the technical solutions of the present application, the following will describe the technical solutions of the present application in detail in conjunction with the accompanying drawings of the specification and specific embodiments.

[0020] Refer to Figure 1 , which is an exemplary flowchart of a method for constructing a 3D printing model of a titanium alloy stent according to some embodiments of the present application. The method for constructing a 3D printing model of a titanium alloy stent mainly includes the following steps: In step 101, the titanium alloy stent to be printed is constructed into a stent simulation model. Based on the structural characteristics of the titanium alloy stent, the stent simulation model is divided into multiple slice layers, and then the slice images of each slice layer are collected.

[0021] It should be noted that in the present application, the stent simulation model refers to a computer simulation model constructed based on the geometric structure and physical properties of the titanium alloy stent; the structural characteristics of the titanium alloy stent refer to the inherent properties of the titanium alloy stent in terms of geometry and mechanics, and the structural characteristics include shape, size, and complexity; the slice layer is a parallel layer for layer-by-layer printing of the stent simulation model, and the thickness of each slice layer ranges from a few micrometers to a few millimeters; the slice image refers to a two-dimensional projection image of each slice layer.

[0022] In specific implementation, a three-dimensional modeling software (e.g., SolidWorks) is used to convert the three-dimensional structure design of the titanium alloy stent to be printed into a digital model as the stent simulation model. The structural features of the titanium alloy stent are obtained from the design description of the titanium alloy stent, and the structural features of the titanium alloy stent can be input into a slicing software (e.g., Cura). The software will generate the slicing thickness and printing parameters of different regions of the titanium alloy stent according to the structural features, so as to use this slicing software to decompose the stent simulation model into multiple cross-sections as slicing layers, and then a computer scanning device (e.g., CT scanning device) can be used to collect the slicing images of each slicing layer.

[0023] In some embodiments, referring to Figure 2 As described, this figure is a schematic flow chart of 3D printing of a titanium alloy stent shown in some embodiments of the present application, and this figure shows the general process of 3D printing. First, start from (A) the CAD model, which is a three-dimensional computer-aided design model that defines the shape and structure of the object to be printed; next, this CAD model needs to go through (B) slicing, which decomposes the three-dimensional model into a series of thin layers and provides instructions for layer-by-layer construction for the 3D printer; then, these slicing data are converted into (C) an STL file, which is a standard 3D printing file format that contains the geometric information of the model; finally, the 3D printer performs (d) layer-by-layer stacking according to the information in the STL file, that is, layer-by-layer printing of materials until the entire object is constructed. This process reflects the complete process of 3D printing technology from design to physical manufacturing.

[0024] In step 102, the distribution information of support points in the stent simulation model is determined through the support structure of the titanium alloy stent, and the support contour of each slicing layer and the support gap between adjacent slicing layers are extracted from each slicing image according to the distribution information of the support points.

[0025] In some embodiments, the determination of the distribution information of support points in the stent simulation model through the support structure of the titanium alloy stent can be implemented by the following steps: Obtain the support structure of the titanium alloy stent; Perform a mechanical analysis on the support structure to obtain multiple support points of the titanium alloy stent, and then determine the distribution coordinates and support forces of each support point; Determine the distribution information of support points in the stent simulation model through all the distribution coordinates and support forces.

[0026] In specific implementation, first, the support structure of the titanium alloy stent can be obtained in the following way: the support structure of the titanium alloy stent can be obtained from the design description of the titanium alloy stent. Then, mechanical analysis is performed on the support structure to obtain multiple support points of the titanium alloy stent. Furthermore, the distribution coordinates and support forces of each support point can be determined in the following way: the finite element analysis method can be used to simulate the external forces (the sum of gravity and thermal stress caused by temperature change) applied during the printing process to obtain multiple support points of the titanium alloy stent during the printing process. For each support point, a three-dimensional coordinate system is established with the center of gravity of the titanium alloy stent as the coordinate origin, the coordinates of the position where the support point is located are used as the distribution coordinates of the support point, and the external force borne by the support point is used as the support force of the support point. Through the above method, the distribution coordinates and support forces of each support point can be obtained. Finally, the distribution information of the support points in the stent simulation model can be determined through all the distribution coordinates and support forces in the following way: the set of all distribution coordinates and support forces is used as the distribution information of the support points in the stent simulation model.

[0027] It should be noted that the support point distribution information represents the spatial distribution and mechanical characteristics of all support points in the titanium alloy stent simulation model; the support structure represents the support component structure used to enhance printing stability and prevent deformation; the support point represents the key action point in the support structure, the distribution coordinates represent the position parameters of the support point in three-dimensional space, and the support force represents the mechanical action borne by the support point during the printing process.

[0028] In some embodiments, the extraction of the support contour of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information can be implemented by the following steps: For each slice layer, the support features of the slice layer are extracted from the support point distribution information. The support contour of the slice layer is extracted from the slice image of the slice layer through the support features, and thus the support contour of each slice layer is obtained. For the support gap between each group of adjacent slice layers, the support features of each slice layer in the adjacent slice layers are obtained. The support gap between adjacent slice layers is determined through all the support features, and thus the support gap between each group of adjacent slice layers is obtained.

[0029] In specific implementation, first, for each slice layer, the support features of the slice layer can be extracted from the support point distribution information in the following way: for each slice layer, the support points in the slice layer whose distribution coordinates are obtained from the support point distribution information are used as slice support points, and the set of distribution coordinates and support forces of all slice support points can be used as the support features of the slice layer; second, the support contour of the slice layer can be extracted from the slice image of the slice layer through the support features, and then the support contours of all slice layers can be obtained in the following way: for each slice support point, the position of each slice support point is marked in the slice image of the slice layer, so that the normal vector at this position is made using the parametric equation of the normal vector, the magnitude of the normal vector is the support force of the slice support point, and the coordinate point at the end of the normal vector is used as the support force coordinate of the slice support point. Through the above method, the support force coordinates of all slice support points can be obtained, and all support force coordinates can be connected into a single closed loop as the support contour of the slice layer. Through the above method, the support contours of all slice layers can be obtained.

[0030] Then, in specific implementation, for the support gaps between each group of adjacent slice layers, the support features of each slice layer in the adjacent slice layers can be obtained in the following way: for the support gaps between each group of adjacent slice layers, the support features of each slice layer in the adjacent slice layers are obtained from the above steps; finally, the support gaps between adjacent slice layers can be determined through all the support features, and then the support gaps between each group of adjacent slice layers can be obtained in the following way: for each slice layer in the adjacent slice layers, the mean value of all support forces in the support features of the slice layer is calculated as the support feature value of the slice layer. Through the above method, the support feature values of all slice layers can be obtained, and the absolute value of the difference between the two support feature values can be used as the support gap between adjacent slice layers. Through the above method, the support gaps between each group of adjacent slice layers can be obtained.

[0031] It should be noted that in this application, the support gap represents the spatial area for the formation of the support structure between adjacent slice layers; the support contour represents the boundary shape and distribution characteristics of the support structure in the slice layer; the support feature is a quantization value used to measure the geometric shape and mechanical distribution characteristics of the support structure.

[0032] In step 103, layer - by - layer compensation is performed on the standard printing interval of the titanium alloy stent according to the shape characteristics of each support gap to obtain the compensation value of the printing interval between adjacent slice layers. Then, according to all the compensation values of the printing intervals and the support contours of each slice layer, layer - by - layer constraints are imposed on the 3D printing strategy of the titanium alloy stent to obtain the collaborative constraint conditions for the layer - by - layer printing of the titanium alloy stent.

[0033] In some embodiments, layer - by - layer compensation is performed on the standard printing interval of the titanium - alloy stent according to the shape characteristics of each support gap to obtain the compensation value of the printing interval between adjacent slice layers. Refer to Figure 3 As described, this figure is a schematic flowchart for determining the compensation value in some embodiments of the present application. The determination of the compensation value in this embodiment can be achieved by the following steps: In step 1031, obtain the standard printing interval between adjacent slice layers of the titanium - alloy stent under the current printing process; In step 1032, for each group of adjacent slice layers, extract the shape characteristics of the support gap between the adjacent slice layers; In step 1033, determine the correlation factor between the printing interval and the shape of the support gap based on the shape characteristics; In step 1034, adjust the standard printing interval according to the correlation factor to obtain the compensation value of the printing interval between adjacent slice layers, and further obtain the compensation values of the printing intervals between each group of adjacent slice layers.

[0034] Specifically, when implemented, first, obtaining the standard printing interval between adjacent slice layers of the titanium - alloy stent under the current printing process can be achieved in the following way, that is: obtain the standard printing interval between adjacent slice layers of the titanium - alloy stent from the printing device description of the titanium - alloy stent; second, for each group of adjacent slice layers, extracting the shape characteristics of the support gap between the adjacent slice layers can be achieved in the following way, that is: for each group of adjacent slice layers, obtain the support contour corresponding to the support gap between the adjacent slice layers, and use an image - processing algorithm (such as edge detection) to extract the spatial layout, shape, size, and the distance between each support point of the support contour as the shape characteristics of the support gap between the adjacent slice layers; then, determining the correlation factor between the printing interval and the shape of the support gap based on the shape characteristics can be achieved in the following way, that is: a finite - element analysis method can be used to perform a large number of simulations on the influence of the shape characteristics on the printing interval, obtain the correlation value between the printing interval output by each simulation and the shape of the support gap, so that the mean value of all correlation values can be used as the correlation factor between the printing interval and the shape of the support gap; finally, adjusting the standard printing interval according to the correlation factor to obtain the compensation value of the printing interval between adjacent slice layers, and further obtaining the compensation values of the printing intervals between each group of adjacent slice layers can be achieved in the following way, that is: use the correlation factor as the adjustment coefficient of the standard printing interval, and take the product of the adjustment coefficient and the standard printing interval as the compensation value of the printing interval between adjacent slice layers. Through the above method, the compensation values of the printing intervals between each group of adjacent slice layers can be obtained.

[0035] It should be noted that in this application, the compensation value is a correction parameter used to adjust the printing error to optimize the interlayer bonding quality; the standard printing interval represents the default printing time interval between adjacent sliced layers; the shape feature represents the geometric shape parameter of the support gap; the correlation factor represents the mathematical correlation parameter between the printing interval and the shape feature of the support gap; the finite element analysis method is a numerical calculation method used to simulate and analyze the mechanical behavior of physical systems. In this application, the finite element analysis method is used to study the influence of the shape feature of the support gap on the printing interval. Its technical principle is to divide the printing structure into multiple discrete finite element units, establish partial differential equations on each finite element unit, and calculate the printing stress distribution, deformation conditions, and interlayer bonding strength under different support gap shapes through numerical solutions. The influence law of different support gap shapes on the printing interval stability is obtained through a large number of simulation experiments, and the correlation value between the printing interval and the support gap shape for each simulation is calculated. The printing interval correction model is constructed using all the correlation values to optimize the stability of layer-by-layer printing, improve the printing accuracy, and the quality of the finished product.

[0036] In some embodiments, the interlayer constraint on the 3D printing strategy of the titanium alloy stent is carried out according to the compensation values of all printing intervals and the support profiles of each sliced layer, and the collaborative constraint conditions for the layer-by-layer printing of the titanium alloy stent can be realized by the following steps: Obtain the standard 3D printing strategy of the titanium alloy stent under the current printing process; For each sliced layer, extract the standard printing path and the standard intervals before and after layer-by-layer printing from the 3D printing strategy; Adjust the stability of the standard interval through the compensation values of the printing intervals before and after layer-by-layer printing of the sliced layer to obtain the corrected intervals before and after printing of the sliced layer; Adjust the support stability of the standard printing path through the support profile of the sliced layer to obtain the stable path during printing of the sliced layer; Determine the collaborative constraint conditions for the layer-by-layer printing of the titanium alloy stent according to the stable path and all the corrected intervals.

[0037] In specific implementation, first, to obtain the standard 3D printing strategy of the titanium alloy stent under the current printing process, the following method can be adopted, that is: obtain the standard 3D printing strategy of the titanium alloy stent under the current printing process from the printing device description of the titanium alloy stent. This 3D printing strategy includes the preset printing path for each slice layer of the titanium alloy stent and the preset time intervals before and after printing; second, for each slice layer, to extract the standard printing path of the slice layer and the standard intervals before and after layer-by-layer printing from the 3D printing strategy, the following method can be adopted, that is: for each slice layer, use the preset printing path of the slice layer in the 3D printing strategy as the standard printing path of the slice layer, and use the preset time interval of the slice layer in the 3D printing strategy before and after printing as the standard interval of the slice layer before and after layer-by-layer printing.

[0038] Then, in specific implementation, the stability of the standard interval is adjusted through the compensation value of the printing interval of the slice layer before and after layer-by-layer printing to obtain the corrected interval of the slice layer before and after printing, which can be realized by the following steps, that is: take the sum of the compensation value of the printing interval of the slice layer before and after layer-by-layer printing and the standard interval before and after layer-by-layer printing as the corrected interval of the slice layer before and after printing; furthermore, the support stability of the standard printing path is adjusted through the support contour of the slice layer to obtain the stable path of the slice layer during printing, which can be realized by the following method, that is: initialize a path planning model based on topology optimization, use the support contour of the slice layer as the constraint condition in this path planning model, use the standard printing path as the adjustment and optimization target in this path planning model, and use this path planning model to optimize the printing path to optimize the density, shape and position of the support during printing, ensuring the coordination of the stability of the support and the printing path, so as to take the printing path optimized by this path planning model as the stable path of the slice layer during printing; finally, to determine the collaborative constraint conditions for layer-by-layer printing of the titanium alloy stent according to the stable path and all corrected intervals, the following method can be adopted, that is: take the stable path as the updated printing path in the 3D printing strategy, take each corrected interval as the time interval of each updated slice layer in the 3D printing strategy before and after printing, so as to take the updated 3D printing strategy as the collaborative constraint conditions for layer-by-layer printing of the titanium alloy stent.

[0039] It should be noted that in this application, the stability strategy is a layer-by-layer printing scheme used to optimize the support stability and the coordination of the printing path; the 3D printing strategy represents the overall printing scheme set before printing; the standard interval represents the default interlayer time interval between adjacent sliced layers set before printing; the standard printing path represents the printing trajectory of the sliced layer set before printing; the calibration interval represents the interlayer printing time interval after calibration based on the support gap; the stable path represents the printing trajectory after optimizing the support density, shape, and position; the path planning model is a computational model based on topology optimization. This path planning model is used to optimize the printing path during the 3D printing of the titanium alloy stent, so as to improve the printing efficiency and material utilization rate while meeting the structural stability. Its technical principle is based on the topology optimization method combined with mathematical optimization algorithms to adjust the material distribution in the design domain to minimize the redundancy of the support structure while ensuring the stability and interlayer bonding quality during the printing process. In this path planning model, the support contour of the sliced layer is set as a constraint condition to ensure that the necessary support during the printing process will not be weakened, while the standard printing path is used as the optimization target. By adjusting the path, the density, shape, and position of the support are made more in line with the printing requirements. This optimized printing path can coordinate the matching relationship between the support structure and the printing path, reduce support redundancy, improve printing accuracy, and optimize the mechanical properties, thereby improving the overall printing quality.

[0040] In step 104, all the sliced layers are integrated into a 3D printing model of the titanium alloy stent based on the collaborative constraint conditions of the layer-by-layer printing.

[0041] In some embodiments, integrating all the sliced layers into a 3D printing model of the titanium alloy stent based on the collaborative constraint conditions of the layer-by-layer printing can be implemented by the following steps: Taking the collaborative constraint conditions of the layer-by-layer printing as the integration conditions between adjacent sliced layers, performing interlayer integration on all the sliced layers to obtain a 3D printing model of the titanium alloy stent.

[0042] In specific implementation, a computer-aided design tool based on the direct-current direct ink writing (DC-DIW) technology is selected as the integration tool. The collaborative constraint conditions for layer-by-layer printing are used as the integration conditions between adjacent sliced layers in this integration tool. This integration tool is used to perform inter-layer integration on all sliced layers, so that the integrated model can be used as the 3D printing model of the titanium alloy stent. It should be noted that in this application, the 3D printing model refers to a three-dimensional structure data model constructed in a digital manner. This 3D printing model contains the geometric information, printing paths, inter-layer connection relationships, and optimized printing parameters of all sliced layers, and can be directly used for manufacturing by a 3D printing device. The computer-aided design tool based on the DC-DIW technology is a software system that integrates design and manufacturing. Its core principle is to control the deposition behavior of conductive ink through a direct-current electric field to achieve high-precision direct writing manufacturing, which is particularly suitable for the construction of fine structures and complex support structures. In this application, this computer-aided design tool is used to process the layer-by-layer printing stability strategy of each sliced layer and serves as the core tool for inter-layer integration, enabling the support profiles, printing paths, and intervals of adjacent sliced layers to be precisely docked after optimization, and finally forming a complete 3D printing model, thereby improving the printing accuracy and stability of the titanium alloy stent.

[0043] It should be noted that in this application, the 3D printing model can be used as the printing target mold of the titanium alloy stent printing device. The titanium alloy stent printing device controls the layer-by-layer deposition of printing materials (such as titanium alloy powder or titanium alloy wire) based on this model, and combines additive manufacturing processes such as laser melting and electron beam melting to achieve precise forming. During the printing process, the titanium alloy stent printing device adjusts the layer-by-layer bonding strength and structural accuracy according to the layer structure and support stability adjustment strategy in the 3D printing model, thereby completing the layer-by-layer printing of the titanium alloy stent and ensuring that its mechanical properties and structural stability meet the design requirements.

[0044] In addition, on the other hand of this application, in some embodiments, this application provides a system for constructing a 3D printing model of a titanium alloy stent. Refer to Figure 4 , which is a schematic structural diagram of the system for constructing a 3D printing model of a titanium alloy stent according to some embodiments of this application. The system for constructing a 3D printing model of a titanium alloy stent includes: a layer-by-layer acquisition module 201, a processing module 202, and an execution module 203, which are described as follows: The layer-by-layer acquisition module 201. In this application, the layer-by-layer acquisition module 201 is mainly used to construct the titanium alloy stent to be printed into a stent simulation model, divide the stent simulation model into multiple sliced layers based on the structural characteristics of the titanium alloy stent, and then acquire the sliced images of each sliced layer. The processing module 202. In this application, the processing module 202 is used to determine the distribution information of support points in the stent simulation model through the support structure of the titanium alloy stent, and extract the support contours of each slice layer and the support gaps between adjacent slice layers from each slice image according to the distribution information of the support points; It should be noted that the processing module 202 is further used to perform interlayer compensation on the standard printing interval of the titanium alloy stent according to the shape characteristics of each support gap to obtain the compensation value of the printing interval between adjacent slice layers, and then perform interlayer constraint on the 3D printing strategy of the titanium alloy stent according to the compensation values of all printing intervals and the support contours of each slice layer to obtain the collaborative constraint conditions for layer-by-layer printing of the titanium alloy stent; The execution module 203. In this application, the execution module 203 is mainly used to integrate all slice layers into a 3D printing model of the titanium alloy stent based on the collaborative constraint conditions for layer-by-layer printing.

[0045] The above has introduced in detail the examples of the method and system for constructing a 3D printing model of a titanium alloy stent provided by the embodiments of this application. It can be understood that, in order to implement the above functions, the corresponding device includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, combining the units and algorithm steps of each example described in the embodiments disclosed in this article, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraint conditions of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0046] In some embodiments, this application also provides a computer device, which includes a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned method for constructing a 3D printing model of a titanium alloy stent.

[0047] In some embodiments, refer to Figure 5 , the dotted line in this figure indicates that this unit or module is optional. This figure is a schematic structural diagram of a computer device for implementing the method for constructing a 3D printing model of a titanium alloy stent provided by the embodiments of this application. The method for constructing a 3D printing model of a titanium alloy stent described in the above embodiments can be implemented by Figure 5 the computer device shown. The computer device includes at least one processor 301, a memory 302, and at least one communication unit 305. The computer device can be a terminal device, a server, or a chip.

[0048] The processor 301 can be a general-purpose processor or a special-purpose processor. For example, the processor 301 can be a central processing unit (CPU), and the CPU can be used to control a computer device, execute software programs, and process the data of software programs. The computer device can also include a communication unit 305 for realizing the input (receiving) and output (sending) of signals.

[0049] For example, the computer device can be a chip, and the communication unit 305 can be the input and / or output circuit of the chip, or the communication unit 305 can be the communication interface of the chip. The chip can be a component of a terminal device, a network device, or other devices.

[0050] Again, for example, the computer device can be a terminal device or a server, and the communication unit 305 can be the transceiver of the terminal device or the server, or the communication unit 305 can be the transceiver circuit of the terminal device or the server.

[0051] The computer device can include one or more memories 302 on which a program 304 is stored. The program 304 can be run by the processor 301 to generate instructions 303, enabling the processor 301 to execute the methods described in the above method embodiments according to the instructions 303. Optionally, data (such as a target audit model) can also be stored in the memory 302. Optionally, the processor 301 can also read the data stored in the memory 302. The data can be stored at the same storage address as the program 304, or it can be stored at a different storage address from the program 304.

[0052] The processor 301 and the memory 302 can be set separately or integrated together. For example, they can be integrated on a system on chip (SOC) of a terminal device.

[0053] It should be understood that the steps of the above method embodiments can be completed by the logic circuit in the form of hardware or the instructions in the form of software in the processor 301. The processor 301 can be a CPU, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices. For example, discrete gate, transistor logic devices, or discrete hardware components.

[0054] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0055] For example, in some embodiments, the present application further provides a computer-readable storage medium, in which instructions or code are stored. When the instructions or code run on a computer, the computer is caused to execute the above-mentioned method for constructing a 3D printing model of a titanium alloy stent.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A method for constructing a 3D printing model of a titanium alloy stent, characterized in that: The steps include: The titanium alloy stent to be printed is constructed as a stent simulation model, and the stent simulation model is divided into a plurality of slice layers based on the structural characteristics of the titanium alloy stent, and then slice images of each slice layer are collected; Determine the support point distribution information in the stent simulation model through the support structure of the titanium alloy stent, and extract the support contour of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information; According to the shape characteristics of each support gap, the standard printing interval of the titanium alloy bracket is compensated between layers to obtain the compensation value of the printing interval between adjacent slice layers. Then, according to the compensation value of all printing intervals and the support contour of each slice layer, the 3D printing strategy of the titanium alloy bracket is constrained between layers to obtain the collaborative constraint conditions for the layered printing of the titanium alloy bracket. Based on the collaborative constraint conditions of the layered printing, all slice layers are integrated into a 3D printing model of the titanium alloy bracket.

2. The method according to claim 1, characterized in that Determining the support point distribution information in the support simulation model through the support structure of the titanium alloy support specifically includes: Obtain the support structure of the titanium alloy stent; Performing mechanical analysis on the support structure to obtain multiple support points of the titanium alloy bracket, and then determining the distribution coordinates and support force of each support point; The support point distribution information in the bracket simulation model is determined through all distribution coordinates and support forces.

3. The method according to claim 1, characterized in that Extracting the support contour of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information specifically includes: For each slice layer, extracting support features of the slice layer from the support point distribution information; Extracting the support contour of the slice layer from the slice image of the slice layer by using the support feature, and then obtaining the support contour of each slice layer; For the support gap between each group of adjacent slice layers, the support features of each slice layer in the adjacent slice layers are obtained; The support gaps between adjacent slice layers are determined through all the support features, and then the support gaps between each group of adjacent slice layers are obtained.

4. The method according to claim 1, characterized in that According to the shape characteristics of each support gap, the standard printing interval of the titanium alloy bracket is compensated for layer by layer, and the compensation value of the printing interval between adjacent slice layers is obtained, which specifically includes: Obtain the standard printing interval between adjacent slice layers of the titanium alloy bracket under the current printing process; For each group of adjacent slice layers, the shape features of the support gaps between the adjacent slice layers are extracted; Determining a correlation factor between a printing interval and a support gap shape based on the shape feature; The standard printing interval is adjusted according to the correlation factor to obtain a compensation value of the printing interval between adjacent slice layers, and further obtain a compensation value of the printing interval between each group of adjacent slice layers.

5. The method according to claim 1, characterized in that According to the compensation values ​​of all printing intervals and the support contours of each slice layer, the 3D printing strategy of the titanium alloy bracket is constrained between layers, and the collaborative constraint conditions for the layered printing of the titanium alloy bracket are obtained, including: Obtain the standard 3D printing strategy for titanium alloy stents under current printing technology; For each slice layer, extracting a standard printing path of the slice layer and a standard interval before and after layered printing from the 3D printing strategy; The standard interval is adjusted for stability by using a compensation value of the printing interval of the slice layer before and after the layered printing to obtain a correction interval of the slice layer before and after the printing; The support stability of the standard printing path is adjusted according to the support profile of the slice layer to obtain a stable path of the slice layer during printing; The coordinated constraint conditions for layered printing of the titanium alloy bracket are determined based on the stable path and all correction intervals.

6. The method according to claim 1, characterized in that Based on the collaborative constraint conditions of the layered printing, all slice layers are integrated into a 3D printing model of a titanium alloy bracket, specifically including: The collaborative constraint conditions of the layered printing are used as integration conditions between adjacent slice layers, and all slice layers are interlayer integrated to obtain a 3D printed model of the titanium alloy bracket.

7. The method according to claim 1, characterized in that Use a computer scanning device to acquire slice images of each slice layer.

8. A titanium alloy stent 3D printing model construction system, characterized in that: include: A layered acquisition module, used to construct a titanium alloy stent to be printed into a stent simulation model, divide the stent simulation model into multiple slice layers based on the structural characteristics of the titanium alloy stent, and then acquire slice images of each slice layer; A processing module, used to determine the support point distribution information in the stent simulation model through the support structure of the titanium alloy stent, and extract the support contour of each slice layer and the support gap between adjacent slice layers from each slice image according to the support point distribution information; The processing module is also used to perform interlayer compensation on the standard printing interval of the titanium alloy bracket according to the shape characteristics of each support gap, obtain the compensation value of the printing interval between adjacent slice layers, and then perform interlayer constraints on the 3D printing strategy of the titanium alloy bracket according to the compensation values ​​of all printing intervals and the support contours of each slice layer, and obtain the collaborative constraint conditions for the layered printing of the titanium alloy bracket; An execution module is used to integrate all the slice layers into a 3D printing model of the titanium alloy bracket based on the collaborative constraint conditions of the layered printing.

9. A computer device, characterized in that: The computer device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the titanium alloy bracket 3D printing model construction method described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed on a computer, the computer implements the titanium alloy bracket 3D printing model construction method according to any one of claims 1 to 7.

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