Negative poisson's ratio cellular bodies, porous bone microstructure, methods of making and implants

Abstract

The application provides a negative Poisson's ratio cell body, a porous bone microstructure and a preparation method and an implant of the porous bone microstructure. The porous bone microstructure comprises a plurality of negative Poisson's ratio cell bodies, the plurality of negative Poisson's ratio cell bodies are arranged to form a three-dimensional structure of the porous bone microstructure in a three-dimensional space, two adjacent negative Poisson's ratio cell bodies in a vertical direction are connected through upper and lower ellipses, and two adjacent negative Poisson's ratio cell bodies in a horizontal direction are connected through left and right connecting rods. The application can solve the defects of the prior art, such as stress shielding after artificial bone implantation, difficulty in regulating the elastic modulus, and stress concentration when being pressed.

Description

Technical Field

[0001] This invention relates to the field of orthopedic medical devices, specifically to a negative Poisson's ratio cell body, a porous bone microstructure, its preparation method, and an implant. Background Technology

[0002] More and more elderly people are facing orthopedic problems, such as cervical spine issues. In clinical practice, bone implantation is a common method for functional restoration, including autologous bone implantation and allogeneic bone implantation. However, autologous bone implantation is limited by resources and cannot meet the demand. Currently, artificial bone implantation is the primary method used clinically, with metal artificial bone being widely used. However, it also has some drawbacks, such as: human bone tissue has a complex structure, is porous, and has a low elastic modulus, while solid metal structures have a high elastic modulus and are not conducive to nutrient transport. Therefore, there is a structural and mechanical mismatch between solid metal artificial bone and human bone tissue, leading to difficulties in bone regeneration and "stress shielding" problems, resulting in poor postoperative outcomes.

[0003] Further research has led to the introduction of porous structures into implants, such as simple cubic lattice structures and diamond structures. These structures can effectively reduce elastic modulus and mass while providing channels for nutrient delivery. Studies have shown that porous structures with high porosity (60%-90%) can promote osteoblast growth. However, while high porosity can reduce elastic modulus, it can also lead to a decrease in strength. In addition, traditional porous structures are mostly connected by straight rods, which can easily lead to stress concentration and cause implant loosening. Furthermore, the small connection area of ​​straight rod structures is not conducive to cell adhesion. Summary of the Invention

[0004] To address these issues, this invention provides a negative Poisson's ratio cell body, a porous bone microstructure, its preparation method, and an implant. This solves the problems of stress shielding after artificial bone implantation, difficulty in controlling the elastic modulus, and stress concentration under pressure in existing technologies.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows: A negative Poisson's ratio cell unit includes two negative Poisson's ratio units and a first concave quadrilateral frame. Each of the two negative Poisson's ratio units includes a second concave quadrilateral frame, an upper ellipse, a lower ellipse, a left connecting rod, and a right connecting rod. Both the first and second concave quadrilateral frames are composed of four concave borders: an upper ligament, a lower ligament, a left ligament, and a right ligament. The upper ellipse connects to the upper ligament of the second concave quadrilateral frame, the lower ellipse connects to the lower ligament, the left connecting rod connects to the left ligament, and the right connecting rod connects to the right ligament. The central axis extending vertically from the negative Poisson's ratio unit is defined as the Z-axis. The center points of the two negative Poisson's ratio units and the first concave quadrilateral frame coincide, as do the Z-axis axes of the two negative Poisson's ratio units, and the two negative Poisson's ratio units are arranged perpendicularly to each other. The first concave quadrilateral frame is arranged perpendicularly to the Z-axis axis. This allows the two negative Poisson's ratio units and the first concave quadrilateral frame to be perpendicularly nested within each other in three-dimensional space.

[0006] Furthermore, the superior ligament, inferior ligament, left ligament, and right ligament are all concave arc segments.

[0007] Furthermore, the major axes of the upper and lower ellipses are parallel to the extension directions of the left and right connecting rods.

[0008] A porous bone microstructure includes multiple negative Poisson's ratio cells as described above. The multiple negative Poisson's ratio cells are arranged in three-dimensional space to form a three-dimensional porous bone microstructure. Two adjacent negative Poisson's ratio cells in the vertical direction are connected by an upper ellipse and a lower ellipse, and two adjacent negative Poisson's ratio cells in the horizontal direction are connected by a left link and a right link.

[0009] Furthermore, two adjacent negative Poisson's ratio cells in the vertical direction are connected by the overlap of the upper and lower ellipses.

[0010] A method for preparing porous bone microstructures includes the following steps: A1. A model of the concave quadrilateral is created using 3D modeling software. The model of the concave quadrilateral is a two-dimensional concave quadrilateral, including the superior ligament, inferior ligament, left ligament and right ligament, thus obtaining the model of the first concave quadrilateral. A2. Using 3D modeling software, a model of the negative Poisson's ratio element is established. Based on the model in step A1, an upper ellipse is established on the upper ligament, a lower ellipse is established on the lower ligament, a left link is established on the left ligament, and a right link is established on the right ligament; thus obtaining a model of a single negative Poisson's ratio element. A3. Using 3D modeling software, the models of two negative Poisson's ratio elements and a first concave quadrilateral frame are combined. Specifically, the center points of the two negative Poisson's ratio elements and the first concave quadrilateral frame model coincide, the Z-axis axes of the two negative Poisson's ratio elements coincide, and the two negative Poisson's ratio elements are set perpendicularly. The first concave quadrilateral frame model is set perpendicular to the Z-axis axis. This allows the two negative Poisson's ratio elements and the first concave quadrilateral frame model to be nested perpendicularly in 3D space, resulting in a model of a single negative Poisson's ratio cell. A4. A porous bone microstructure model is formed by arranging multiple negative Poisson's ratio cell models in three-dimensional space using 3D modeling software. In this model, two adjacent negative Poisson's ratio cells in the vertical direction are connected by an upper ellipse and a lower ellipse, and two adjacent negative Poisson's ratio cells in the horizontal direction are connected by a left link and a right link. A5. Import the porous bone microstructure model obtained in step A4 into the 3D printing software and print the finished product using a 3D printer.

[0011] Furthermore, the superior ligament, inferior ligament, left ligament, and right ligament are all concave arc segments. In step A1, the inner curve L of the superior ligament follows a hyperbolic equation: (-1.5≤x≤1.5) is obtained, and then the curvature and size of the four ligaments are designed by hyperbolic parametric design; then the four ligaments are obtained by circular array distribution, with the ligament bandwidth d and thickness t taking values ​​of 0.4mm-0.8mm, and then the corners between adjacent ligaments are rounded.

[0012] Furthermore, in step A2, the major axes of the upper and lower ellipses are parallel to the extension directions of the left and right connecting rods.

[0013] Furthermore, in step A4, two adjacent negative Poisson's ratio cells in the vertical direction are connected by the overlap of the upper and lower ellipses.

[0014] Further, in step A5, the following steps are taken: the model of the designed porous bone microstructure is saved as a .STL file and imported into the 3D printing software for support generation and printing parameter setting. After completing the relevant settings, it is imported into the 3D printing SLM equipment for sample printing; the power is 195W; the layer thickness is 0.03mm; the substrate preheating temperature is 35℃; the scanning speed is 1200mm; the scanning spacing is 0.13mm; protective gas is introduced into the cavity; after printing, the sample is cooled to room temperature and then subjected to heat treatment and sandblasting.

[0015] An implant having the porous bone microstructure described above.

[0016] The technical solution provided by this invention has the following beneficial effects: 1. Negative Poisson's ratio structures have the mechanical characteristics of high strength and low elastic modulus. The elastic modulus can be controlled over a wide range by adjusting the cell structure parameters, which solves the problem of "stress shielding" caused by the huge difference in elastic modulus between human bone and metal materials, as well as the contradiction that traditional porous structures can only reduce the elastic modulus by increasing porosity, which leads to a decrease in strength.

[0017] 2. When the porous bone microstructure designed in this invention is under pressure, the ellipse transmits the pressure to the ligaments of the concave four-sided frame, causing them to contract inward. Compared with the traditional negative Poisson's ratio structure, which only contracts in a two-dimensional plane, this porous structure undergoes large deformation in a three-dimensional plane, thereby obtaining a better energy absorption capacity per unit mass, improving the plasticity of the metal, and the greater central contraction concentration effect provides the structure with better impact resistance and fatigue resistance.

[0018] 3. The porous bone microstructure adopts concave four-sided border, elliptical and other curved surface structures to increase the specific area of ​​the porous structure, which is conducive to cell attachment and growth.

[0019] 4. This porous bone microstructure has an unconventional deformation mechanism. During implantation, a load is applied to cause the entire porous structure to contract toward the geometric center, thereby reducing mechanical damage to the patient's bone tissue. After implantation, the load is unloaded, and the entire structure expands outward at the same time, increasing the contact area with bone tissue, which is beneficial for fixation and promotes fusion. Attached Figure Description

[0020] Figure 1 The diagram shown is a flowchart of the preparation method of the porous bone microstructure in the embodiment; Figure 2 The diagram shown is a schematic representation of the first concave quadrilateral frame of the negative Poisson's ratio cell in the embodiment. Figure 3 The diagram shown is a schematic representation of the structure of the negative Poisson's ratio unit in the embodiment. Figure 4 The diagram shown is a schematic representation of the negative Poisson's ratio cell in the embodiment. Figure 5 The diagram shown is a schematic representation of the porous bone microstructure in the embodiment. Figure 6 The diagram shown is a structural schematic of the fusion unit in the embodiment. Figure 7 The diagram shown is a structural schematic of the implant in the embodiment. Detailed Implementation

[0021] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0023] Reference Figures 2 to 4 As shown, this embodiment provides a negative Poisson's ratio cell 30, including two negative Poisson's ratio units 20 and a first concave quadrilateral frame 10. Each of the two negative Poisson's ratio units 20 includes a second concave quadrilateral frame 21, an upper ellipse 22, a lower ellipse 23, a left connecting rod 24, and a right connecting rod 25. Both the first and second concave quadrilateral frames 10 and 21 are composed of four concave frames, which are the superior ligament, inferior ligament, left ligament, and right ligament, respectively. Specifically, the superior ligament 11, inferior ligament 12, left ligament 13, and right ligament 14 form the first concave quadrilateral frame 10; the superior ligament 211, inferior ligament 212, left ligament 213, and right ligament 214 form the second concave quadrilateral frame 21. Figure 3 As shown, the upper ellipse 22 connects to the upper ligament 211 of the second concave four-sided frame 21, the lower ellipse 23 connects to the lower ligament 212 of the second concave four-sided frame 21, the left connecting rod 24 connects to the left ligament 213 of the second concave four-sided frame 21, and the right connecting rod 25 connects to the right ligament 214 of the second concave four-sided frame 21.

[0024] Define the central axis extending vertically of the negative Poisson's ratio unit 20 as the Z-axis axis a. The center points of the two negative Poisson's ratio units 20 and the first concave quadrilateral frame 10 coincide, the Z-axis axis a of the two negative Poisson's ratio units 20 coincide, and the two negative Poisson's ratio units 20 are set perpendicularly to each other. The first concave quadrilateral frame 10 is set perpendicular to the Z-axis axis a. This can be understood as follows: Figure 4 As shown, in the X / Y / Z three-axis coordinate system, two negative Poisson ratio units 20 are distributed on the XZ plane and the YZ plane respectively, while the first concave quadrilateral frame 10 is distributed on the XY plane, so that the two negative Poisson ratio units 20 and the first concave quadrilateral frame 10 are perpendicular and nested in the three-dimensional space; thus obtaining the negative Poisson ratio cell 30.

[0025] Specifically, in this embodiment, the superior ligament (11, 211), inferior ligament (12, 212), left ligament (13, 213), and right ligament (14, 214) are all concave arc segments. The major axes of the upper ellipse 22 and the lower ellipse 23 are parallel to the extension directions of the left connecting rod 24 and the right connecting rod 25, which are both horizontal in this embodiment.

[0026] Continue to refer to Figure 5 As shown, this embodiment also provides a porous bone microstructure 100, including multiple negative Poisson's ratio cells 30 as described above. These multiple negative Poisson's ratio cells 30 are arranged in three-dimensional space to form a three-dimensional porous bone microstructure 100. For example, in this specific embodiment, 64 negative Poisson's ratio cells 30 are arranged in a 4... 4 The array of 4 cells forms a three-dimensional porous bone microstructure 100. Two adjacent negative Poisson's ratio cells 30 in the vertical direction are connected by an upper ellipse 22 and a lower ellipse 23. Specifically, the upper ellipse 22 and the lower ellipse 23 are overlapped, meaning the lower ellipse 23 of the upper negative Poisson's ratio cell 30 overlaps with the upper ellipse 22 of the lower negative Poisson's ratio cell 30. This can be understood as a single ellipse after overlap, resulting in a stable connection. However, in other embodiments, this is not limited to this; the lower ellipse 23 of the upper negative Poisson's ratio cell 30 and the upper ellipse 22 of the lower negative Poisson's ratio cell 30 can also be vertically distributed and connected. Simultaneously, two adjacent negative Poisson's ratio cells 30 in the horizontal direction are connected by a left connecting rod 24 and a right connecting rod 25.

[0027] This embodiment also provides an implant having the porous bone microstructure 100 described above.

[0028] Specifically, the implant is as follows: Figure 6 The interbody fusion device 200 shown is as follows: Figure 7 The implant 300 or acetabular cup (not shown) and other artificial bone are used for implantation so that the porous bone microstructure 100 can be well used in different implants.

[0029] The porous bone microstructure provided in this solution, when applied to artificial bone implants, exhibits the following effects: 1. Negative Poisson's ratio structures have the mechanical characteristics of high strength and low elastic modulus. The elastic modulus can be controlled over a wide range by adjusting the cell structure parameters, which solves the problem of "stress shielding" caused by the huge difference in elastic modulus between human bone and metal materials, as well as the contradiction that traditional porous structures can only reduce the elastic modulus by increasing porosity, which leads to a decrease in strength.

[0030] 2. When the porous bone microstructure 100 designed in this scheme is under pressure, the ellipse transmits the pressure to the ligaments of the concave four-sided frame, causing it to contract inward. Compared with the traditional negative Poisson's ratio structure, which only contracts in a two-dimensional plane, this porous structure undergoes large deformation in a three-dimensional plane, thereby obtaining a better energy absorption capacity per unit mass, improving the plasticity of the metal, and the larger central contraction concentration effect provides the structure with better impact resistance and fatigue resistance.

[0031] 3. The porous bone microstructure 100 adopts a concave four-sided frame, elliptical and other curved surface structure to increase the specific area of ​​the porous structure, which is conducive to cell attachment and growth.

[0032] 4. The porous bone microstructure 100 has an unconventional deformation mechanism. During implantation, a load is applied to cause the entire porous structure to contract toward the geometric center, thereby reducing mechanical damage to the patient's bone tissue. After implantation, the load is unloaded, and the entire structure expands outward at the same time, increasing the contact area with bone tissue, which is beneficial for fixation and promotes fusion.

[0033] In this specific embodiment, all connections between components employ rounded chamfers for transition. For example, the connection between two adjacent ligaments (such as the upper ligament 11 and the left ligament 13) is rounded, as is the connection between the left ligament 13 and the left connecting rod 24. The curved surface design at the connections eliminates the tip effect of traditional porous straight rod connections, resulting in a relatively smooth local connection and reducing stress concentration. Simultaneously, it increases the contact area of ​​the rods, making the structure less prone to instability.

[0034] Continue to refer to Figure 1 As shown, this embodiment also provides a method for preparing a porous bone microstructure, used to prepare the above-mentioned porous bone microstructure 100, comprising the following steps: A1. A two-dimensional model of the concave quadrilateral is created using 3D modeling software. This model includes the superior ligament 11, inferior ligament 12, left ligament 13, and right ligament 14. The result is as follows: Figure 2 The model of the first concave four-sided frame 10 shown; A2. Using 3D modeling software, create a model of the negative Poisson's ratio element 20. Based on the model from step A1, copy the model of the first concave quadrilateral 10 from step A1 to obtain a model of the second concave quadrilateral 21 with the same structure. Create an upper ellipse 22 on the upper ligament 211 of the second concave quadrilateral 21, a lower ellipse 23 on the lower ligament 212 of the second concave quadrilateral 21, a left connecting rod 24 on the left ligament 213 of the second concave quadrilateral 21, and a right connecting rod 25 on the right ligament 214 of the second concave quadrilateral 21; thus obtaining... Figure 3 The model of a single negative Poisson's ratio element 20 is shown; A3, using 3D modeling software, the models of two negative Poisson's ratio elements 20 and one model of a first concave quadrilateral frame 10 are combined. Specifically, the center points of the two negative Poisson's ratio elements 20 and the first concave quadrilateral frame 10 are aligned, the Z-axis a of the two negative Poisson's ratio elements 20 are aligned, and the two negative Poisson's ratio elements 20 are set perpendicularly to each other. The model of the first concave quadrilateral frame 10 is set perpendicular to the Z-axis a. This allows the two negative Poisson's ratio elements 20 and the first concave quadrilateral frame 10 to be nested perpendicularly in 3D space, resulting in the following: Figure 4 The model shown is a single negative Poisson's ratio cell 30; A4, using 3D modeling software, multiple negative Poisson's ratio cell bodies 30 are arranged in 3D space to form a three-dimensional porous bone microstructure 100 model, such as... Figure 5 As shown, the models of two adjacent negative Poisson's ratio cells 30 in the vertical direction are connected by an upper ellipse 22 and a lower ellipse 23, and the models of two adjacent negative Poisson's ratio cells 30 in the horizontal direction are connected by a left link 24 and a right link 25. A5. Import the model of the porous bone microstructure 100 obtained in step A4 into the 3D printing software, and print the finished product using a 3D printer to obtain the porous bone microstructure 100 described above.

[0035] Specifically, in this embodiment, the superior ligament (11, 211), inferior ligament (12, 212), left ligament (13, 213), and right ligament (14, 214) are all concave arc segments; in step A1, the inner curve L of the superior ligament 11 follows a hyperbolic equation: (-1.5≤x≤1.5) is obtained, and then the curvature and size of the four ligaments are designed using hyperbolic parametric design; then, the four ligaments are obtained through a circular array distribution, as shown below. Figure 2 As shown, the ligament width d and thickness t are taken as 0.4mm-0.8mm. In this embodiment, d=0.6mm and t=0.6mm are taken. Then, the corners between adjacent ligaments are rounded. In order to avoid stress concentration at the tip of the ligament intersection, specifically, the outer radius R=0.5mm and the inner radius r=0.1mm.

[0036] Specifically, in step A2, the major axes of the upper ellipse 22 and the lower ellipse 23 are parallel to the extension directions of the left connecting rod 24 and the right connecting rod 25; in this embodiment, they are both horizontal.

[0037] Specifically, in step A4, two adjacent negative Poisson's ratio cells 30 in the vertical direction are connected by the overlap of the upper ellipse 22 and the lower ellipse 23, and the connection is stable.

[0038] Step A5 specifically involves: saving the designed porous bone microstructure 100 model as a .STL file and importing it into 3D printing software; generating the support structure and setting the printing parameters; and then importing it into a 3D printing SLM device for sample printing. The power is 195W; layer thickness is 0.03mm; substrate preheating temperature is 35℃; scanning speed is 1200mm; scanning spacing is 0.13mm; protective gas is introduced into the cavity; after printing, the sample is cooled to room temperature before heat treatment and sandblasting; finally, the product is obtained. The above printing parameters are one of the more preferred parameters for 3D printing, but other embodiments are not limited to these.

[0039] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A negative Poisson's ratio cell, characterized in that: It includes two negative Poisson's ratio units and a first concave quadrilateral frame. Each of the two negative Poisson's ratio units includes a second concave quadrilateral frame, an upper ellipse, a lower ellipse, a left connecting rod, and a right connecting rod. The first and second concave quadrilateral frames are each composed of four concave frames, namely the upper ligament, the lower ligament, the left ligament, and the right ligament. The upper ellipse connects to the upper ligament of the second concave quadrilateral frame, and the lower ellipse connects to the lower ligament of the second concave quadrilateral frame. The major axes of the upper and lower ellipses are parallel to the extension directions of the left and right connecting rods. The left connecting rod is connected to the left ligament of the second concave four-sided frame, and the right connecting rod is connected to the right ligament of the second concave four-sided frame. The central axis extending vertically of the negative Poisson's ratio unit is defined as the Z-axis. The center points of the two negative Poisson's ratio units and the first concave quadrilateral frame coincide, the Z-axis of the two negative Poisson's ratio units coincide, and the two negative Poisson's ratio units are set perpendicularly to each other. The first concave quadrilateral frame is set perpendicular to the Z-axis. Thus, the two negative Poisson's ratio units and the first concave quadrilateral frame are perpendicularly nested in three-dimensional space.

2. The negative Poisson's ratio cell according to claim 1, characterized in that: The superior ligament, inferior ligament, left ligament, and right ligament are all concave arc segments.

3. A porous bone microstructure, characterized in that: It includes multiple negative Poisson's ratio cells as described in any one of claims 1-2, and the multiple negative Poisson's ratio cells are arranged in three-dimensional space to form a porous bone microstructure with a three-dimensional structure. Two adjacent negative Poisson's ratio cells in the vertical direction are connected by an upper ellipse and a lower ellipse, and two adjacent negative Poisson's ratio cells in the horizontal direction are connected by a left link and a right link.

4. The porous bone microstructure according to claim 3, characterized in that: Two adjacent negative Poisson's ratio cells in the vertical direction are connected by the overlap of the upper and lower ellipses.

5. A method for preparing porous bone microstructures, characterized in that: The steps include the following: A1. A model of the concave quadrilateral is created using 3D modeling software. The model of the concave quadrilateral is a two-dimensional concave quadrilateral, including the superior ligament, inferior ligament, left ligament and right ligament, thus obtaining the model of the first concave quadrilateral. A2. A model of the negative Poisson's ratio unit is established using 3D modeling software. Based on the model in step A1, an upper ellipse is established on the upper ligament and a lower ellipse is established on the lower ligament. The major axes of the upper and lower ellipses are parallel to the extension directions of the left and right connecting rods. A left connecting rod is established on the left ligament and a right connecting rod is established on the right ligament. A model of a single negative Poisson's ratio element is obtained; A3. Using 3D modeling software, the models of two negative Poisson's ratio elements and a first concave quadrilateral frame are combined. Specifically, the center points of the two negative Poisson's ratio elements and the first concave quadrilateral frame model coincide, the Z-axis axes of the two negative Poisson's ratio elements coincide, and the two negative Poisson's ratio elements are set perpendicularly. The first concave quadrilateral frame model is set perpendicular to the Z-axis axis. This allows the two negative Poisson's ratio elements and the first concave quadrilateral frame model to be nested perpendicularly in 3D space, resulting in a model of a single negative Poisson's ratio cell. A4. A porous bone microstructure model is formed by arranging multiple negative Poisson's ratio cell models in three-dimensional space using 3D modeling software. In this model, two adjacent negative Poisson's ratio cells in the vertical direction are connected by an upper ellipse and a lower ellipse, and two adjacent negative Poisson's ratio cells in the horizontal direction are connected by a left link and a right link. A5. Import the porous bone microstructure model obtained in step A4 into the 3D printing software and print the finished product using a 3D printer.

6. The method for preparing porous bone microstructures according to claim 5, characterized in that: The superior, inferior, left, and right ligaments are all concave arc segments. In step A1, the inner curve L of the superior ligament follows a hyperbola equation: (-1.5≤x≤1.5) is obtained, and then the curvature and size of the four ligaments are designed by hyperbolic parametric design; then the four ligaments are obtained by circular array distribution, with the ligament bandwidth d and thickness t taking values ​​of 0.4mm-0.8mm, and then the corners between adjacent ligaments are rounded.

7. The method for preparing porous bone microstructures according to claim 5, characterized in that: In step A4, two adjacent negative Poisson's ratio cells in the vertical direction are connected by the overlap of the upper and lower ellipses.

8. The method for preparing porous bone microstructures according to claim 5, characterized in that: In step A5, the following steps are taken: the model of the designed porous bone microstructure is saved as a .STL file and imported into the 3D printing software. Support generation and printing parameter settings are then performed. After completing the relevant settings, the model is imported into the 3D printing SLM equipment for sample printing. The power is 195W; the layer thickness is 0.03mm; the substrate preheating temperature is 35℃; the scanning speed is 1200mm; the scanning spacing is 0.13mm; protective gas is introduced into the cavity; after printing, the model is cooled to room temperature before heat treatment and sandblasting.

9. An implant, characterized in that, The implant has the porous bone microstructure as described in claim 3 or 4.

Images