Laser printing method for interbody fusion cage and interbody fusion cage

Abstract

The invention discloses a laser printing method for an interbody fusion cage and the interbody fusion cage, and relates to the field of medical instruments. The laser printing method for the interbody fusion cage comprises the steps that a printing model comprising an intermediate model, an interbody fusion cage model and a virtual connection layer is established; laser printing parameters are established according to the printing model, and the energy density of laser input corresponding to the virtual connection layer is different from the energy density corresponding to the intermediate model and the energy density corresponding to the interbody fusion cage model; printing according to the laser printing parameters to obtain a printing structure; and applying an acting force to destroy the virtual connectors between the interbody fusion cages and the interbody so as to dismount the interbody and obtain a plurality of interbody fusion cages. According to the laser printing method for the interbody fusion cage, the preparation efficiency of the interbody fusion cage can be remarkably improved, and the preparation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a laser printing method for an intervertebral fusion device and an intervertebral fusion device. Background Art

[0002] At present, metal laser powder bed 3D printing technology is the most widely used metal 3D printing technology. Because of its small laser spot size, the powder layer does not need to be preheated during the printing process, and it can form products with higher resolution and surface accuracy and more complex structures.

[0003] When this printing technology is applied to the preparation of intervertebral fusion devices, it is necessary to provide a relatively dense and high-strength support structure on the product, which makes it impossible to perform one-time batch printing. In addition, the subsequent product processing procedures are complicated, which affects the preparation efficiency and increases the preparation cost. Summary of the invention

[0004] The object of the present invention is to provide a laser printing method for an intervertebral fusion cage, which can significantly improve the preparation efficiency of the intervertebral fusion cage and reduce the preparation cost.

[0005] Another object of the present invention is to provide an intervertebral fusion cage which has the characteristics of high preparation efficiency and low preparation cost.

[0006] The embodiment of the present invention provides a technical solution:

[0007] A laser printing method for an intervertebral fusion device, comprising:

[0008] Establishing a printing model including an intermediate model, an intervertebral fusion cage model and a virtual connection layer, wherein a plurality of the intervertebral fusion cage models are arranged in sequence in a vertical direction, the intermediate model is located between any two adjacent intervertebral fusion cage models, and any intervertebral fusion cage model is connected to the intermediate model via the virtual connection layer;

[0009] Establishing laser printing parameters according to the printing model, wherein the energy density of the laser input corresponding to the virtual connection layer is different from the energy density corresponding to the intermediate model and the intervertebral fusion cage model;

[0010] Printing is performed according to the laser printing parameters to obtain a printed structure, wherein the printed structure includes a plurality of intervertebral fusion cages arranged in sequence, and an intermediate body between any two adjacent intervertebral fusion cages, and any of the intervertebral fusion cages is connected to the intermediate body via a virtual connector;

[0011] A force is applied to destroy the virtual connectors between each of the intervertebral fusion cages and the intermediate body, so as to remove the intermediate body and obtain a plurality of the intervertebral fusion cages.

[0012] In an optional embodiment, the intervertebral fusion cage model has a porous structure, and the pore size of the porous structure is normally distributed between 100 μm and 800 μm, and / or,

[0013] The porosity of the porous structure is greater than 40%.

[0014] In an optional embodiment, the porous structure is a regular structure or a disordered structure.

[0015] In an optional embodiment, the bottom end of each intervertebral fusion cage model has a downwardly protruding angle portion, and the surface of the angle portion of the upper one of the two adjacent intervertebral fusion cage models is covered with the virtual connection layer, and the angle portion is connected to the corresponding intermediate model through the virtual connection layer.

[0016] In an optional embodiment, the printed model further includes a support body model, which supports the intervertebral fusion cage model at the bottom of the arrangement queue on the printing substrate, and the angle portion of the intervertebral fusion cage model at the bottom is connected to the support body model via a virtual connection layer.

[0017] In an optional embodiment, the top of each intervertebral fusion cage model has a chimeric countersunk hole extending vertically downward, the intermediate body model includes a chimeric rod model and a support cap model connected to the top of the chimeric rod model, the bottom end of the chimeric rod model is embedded in the chimeric countersunk hole, and the gap between the chimeric rod model and the hole wall of the chimeric countersunk hole is filled by the virtual connection layer;

[0018] The upper surface of the supporting cap model has a cavity corresponding to the angle portion, the angle portion of the corresponding intervertebral fusion cage model is embedded in the cavity, and the gap between the angle portion and the cavity wall is filled with the virtual connection layer.

[0019] In an optional embodiment, the bottom wall of the embedded countersunk hole has an angled depression, and the bottom end of the embedded rod model has an angled protrusion, and the angled protrusion is embedded in the angled depression.

[0020] In an optional embodiment, compared with the intermediate model and the intervertebral fusion cage model, the virtual connection layer has lower strength, and / or,

[0021] The thickness of the virtual connection layer is between 0.1 mm and 0.5 mm.

[0022] In an optional embodiment, the step of printing according to the laser printing parameters to obtain a printed structure includes:

[0023] Monitor heat during printing to obtain heat distribution data;

[0024] Printing parameters are adjusted in real time according to the heat distribution data to maintain heat balance.

[0025] The present invention further provides an intervertebral fusion device, which is prepared according to the above-mentioned laser printing method for the intervertebral fusion device, and the laser printing method for the intervertebral fusion device comprises:

[0026] Establishing a printing model including an intermediate model, an intervertebral fusion cage model and a virtual connection layer, wherein a plurality of the intervertebral fusion cage models are arranged in sequence in a vertical direction, the intermediate model is located between any two adjacent intervertebral fusion cage models, and any intervertebral fusion cage model is connected to the intermediate model via the virtual connection layer;

[0027] Establishing laser printing parameters according to the printing model, wherein the energy density of the laser input corresponding to the virtual connection layer is different from the energy density corresponding to the intermediate model and the intervertebral fusion cage model;

[0028] Printing is performed according to the laser printing parameters to obtain a printed structure, wherein the printed structure includes a plurality of intervertebral fusion cages arranged in sequence, and an intermediate body between any two adjacent intervertebral fusion cages, and any of the intervertebral fusion cages is connected to the intermediate body via a virtual connector;

[0029] A force is applied to destroy the virtual connectors between each of the intervertebral fusion cages and the intermediate body, so as to remove the intermediate body and obtain a plurality of the intervertebral fusion cages.

[0030] Compared with the prior art, the laser printing method of the intervertebral fusion device provided by the present invention establishes a printing model composed of an intermediate model, an intervertebral fusion device model and a virtual connection layer. The virtual connection layer is actually a low-strength connection structure formed after the printing powder is heated by the laser. By combining with the intermediate model, the overall virtual connection of multiple intervertebral fusion device models is realized. The intermediate model corresponds to the printed intermediate, the intervertebral fusion device model corresponds to the printed intervertebral fusion device, and the virtual connection layer corresponds to the printed virtual connector. In the printed structure after printing, the virtual connector has low strength, and a virtual connection between the intermediate and the intervertebral fusion body, that is, a low-strength connection, is realized. Therefore, after printing is completed, the virtual connector structure can be destroyed by applying a force, so that the intermediate and the intervertebral fusion device can be easily separated, eliminating the complicated separation operation. Therefore, the beneficial effects of the laser printing method provided by the present invention include: it can significantly improve the preparation efficiency of the intervertebral fusion device and reduce the preparation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative work.

[0032] Figure 1 A flowchart of a laser printing method for an intervertebral fusion device provided by an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of a portion of the structure of the printed model obtained in step S101;

[0034] Figure 3 for Figure 2 A magnified schematic diagram of the middle A area;

[0035] Figure 4 for Figure 2 A magnified schematic diagram of the middle B area;

[0036] Figure 5 for Figure 1 Schematic diagram of the structure of the intermediate model;

[0037] Figure 6 for Figure 1 A schematic diagram of a portion of the printed structure obtained in step S103.

[0038] Icons: 100-printed model; 110-intermediate body model; 111-chimeric rod model; 112-support cap model; 113-angle protrusion; 120-intervertebral fusion cage model; 121-angle part; 122-chimeric countersunk hole; 123-angle depression; 130-virtual connection layer; 140-support body model; 200-printed structure; 210-intervertebral fusion cage; 220-intermediate body; 230-virtual connector. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0043] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0046] Example

[0047] This embodiment provides a laser printing method for an intervertebral fusion cage, which is used to prepare an intervertebral fusion cage 210. Figure 1 , Figure 1 A flowchart of the laser printing method is shown, and the laser printing method may include:

[0048] Step S101 , establishing a printing model 100 including an intermediate model 110 , an intervertebral fusion cage model 120 and a virtual connection layer 130 .

[0049] Please refer to Figure 2, Figure 3 and Figure 4 , Figure 2 FIG. 1 is a partial structural diagram of the printing model 100. Figure 3 Shown Figure 2 A magnified schematic diagram of area A in the middle. Figure 4 Shown Figure 2 A magnified schematic diagram of area B.

[0050] The printed model 100 includes a plurality of intervertebral fusion cage models 120 , which are arranged in sequence and spaced apart in the vertical direction. An intermediate model 110 is provided between any two adjacent intervertebral fusion cage models 120 , and any intervertebral fusion cage model 120 is connected to the intermediate model 110 via a virtual connection layer 130 .

[0051] It can be understood that the intervertebral fusion cage model 120 in the printed model 100 is subsequently printed to obtain the intervertebral fusion cage 210, the intermediate body model 110 is printed to obtain the intermediate body 220, and the virtual connection layer 130 is printed to obtain the virtual connection body 230. In other words, Figure 2 The structure of the printed model 100 shown is substantially the same as the printed structure 200 obtained by subsequent printing.

[0052] Compared with the intermediate model 110 and the intervertebral fusion cage model 120, the virtual connection layer 130 has lower strength. In fact, there is a gap between the intervertebral fusion cage model 120 and the intermediate model 110, and the virtual connection layer 130 fills the gap to achieve virtual connection between the intervertebral fusion cage model 120 and the intermediate model 110, that is, a connection with lower strength.

[0053] In this embodiment, the thickness of the virtual connection layer 130 is between 0.1 mm and 0.5 mm, that is, the width of the gap between the intervertebral fusion cage model 120 and the intermediate body model 110 is between 0.1 mm and 0.5 mm.

[0054] In the subsequent printing process, the printing powder in the gap between the intervertebral fusion cage model 120 and the intermediate body model 110 is melted to a certain extent under the heat of the laser and then solidified to form a virtual connector 230 to achieve a virtual connection between the intervertebral fusion cage model 120 and the intermediate body model 110, ensuring that the printed structure 200 can be smoothly stacked and printed, and after printing, the intervertebral fusion cage 210 and the intermediate body 220 can be easily separated by destroying the virtual connector 230. In this embodiment, the virtual connector 230 and the intermediate body 220 can be either a solid structure or a porous mesh structure.

[0055] The intervertebral fusion cage model 120 has a porous structure, and the pore sizes of the porous structure are normally distributed between 100 μm and 800 μm, and the porosity of the porous structure is greater than 40%.

[0056] In practical applications, the proportion of the porous structure in the intervertebral fusion cage model 120 can be adjusted according to actual application conditions. An increase in the proportion can reduce heat accumulation during the printing process, reduce thermal stress, and improve printing quality.

[0057] The porous structure can be a regular structure or a disordered structure. If it is a disordered structure, the porous structure unit nodes can move randomly in the three directions of space XYZ according to the set random rate, thereby obtaining a random bionic pore structure.

[0058] In practical applications, as the degree of disorder increases, the local stress value inside the solid structure obtained by subsequent printing of the porous structure will decrease significantly under the condition of mechanical loading. The decrease in the local stress value can increase the safety threshold of mechanical damage of the structure and is beneficial to load-bearing.

[0059] In this embodiment, the bottom end of each intervertebral fusion cage model 120 has a downwardly protruding angle portion 121, and the surface of the corresponding angle portion 121 on the upper side of two adjacent intervertebral fusion cage models 120 is covered with a virtual connection layer 130, and the angle portion 121 is connected to the corresponding intermediate model 110 through the virtual connection layer 130.

[0060] The printed model 100 further includes a support model 140 , which supports the intervertebral fusion cage model 120 at the bottom of the arrangement queue on the printing substrate. The angle portion 121 of the intervertebral fusion cage model 120 at the bottom is connected to the support model 140 via a virtual connection layer 130 .

[0061] The angle portion 121 is actually a structure that protrudes vertically downward and has a smooth transition. Due to the setting of the angle portion 121, sudden changes in the slice cross section are avoided during the subsequent printing process, which is beneficial to the gradual transfer of heat, reducing thermal gradients and deformation, and can also reduce the depth of laser penetration to obtain better printing quality.

[0062] Please refer to Figure 5 , Figure 5 Shown is a schematic structural diagram of the intermediate model 110 .

[0063] In this embodiment, the top of each intervertebral fusion device model 120 has an interlocking countersunk hole 122 extending vertically downward. The intermediate model 110 includes an interlocking rod model 111 and a supporting cap model 112 connected to the top of the interlocking rod model 111. The bottom end of the interlocking rod model 111 is embedded in the interlocking countersunk hole 122, and the gap between the interlocking rod model 111 and the hole wall of the interlocking countersunk hole 122 is filled with a virtual connection layer 130.

[0064] The upper surface of the supporting cap model 112 has a cavity corresponding to the angle portion 121 , the angle portion 121 of the corresponding intervertebral fusion cage model 120 is embedded in the cavity, and the gap between the angle portion 121 and the cavity wall is filled with the virtual connection layer 130 .

[0065] Similarly, in order to avoid abrupt changes in the slice cross section and further improve the printing quality, in this embodiment, the bottom wall of the embedded countersunk hole 122 has an angled depression 123, and the bottom end of the embedded rod model 111 has an angled protrusion 113, and the angled protrusion 113 is embedded in the angled depression 123. Preferably, in this embodiment, the angled depression 123 is conical, and the angled protrusion 113 is correspondingly conical.

[0066] In fact, the support body model 140 also has a cavity with the same structure as the support cap model 112 . The angle portion 121 of the intervertebral fusion cage model 120 at the bottom is embedded in the cavity of the support body model 140 and connected to the cavity wall through the virtual connection layer 130 .

[0067] Please continue reading Figure 1 The laser printing method provided in this embodiment may further include:

[0068] Step S102 , establishing laser printing parameters according to the printing model 100 .

[0069] The energy density of the laser input corresponding to the virtual connection layer 130 is different from the energy density corresponding to the intermediate model 110 and the intervertebral fusion cage model 120 .

[0070] It is understandable that the printing model 100 is sliced ​​and printed in a simulated manner, and the simulation results are analyzed to guide the setting of the scanning strategy and other parameters and establish the laser printing parameters.

[0071] In this embodiment, the laser power is set between 0W and 450W, the scanning rate is between 100mm / s and 3000mm / s, the overlap distance is between 0.05mm and 0.2mm, the layer thickness is between 0.02mm and 0.1mm, and the filling strategy is strip, island, linear, etc.

[0072] In practical applications, in order to form a virtual connector 230 between the intermediate body 220 and the intervertebral fusion cage 210, it is necessary to control the laser printing parameters of the printing powder in the gap between the intervertebral fusion cage model 120 and the intermediate body model 110. The parameters may include laser power, scanning speed, overlap distance, layer thickness, filling strategy, etc., to achieve the purpose of changing the corresponding energy density, so that the virtual connector 230 formed by this part of the printing powder after melting and solidification has a lower strength, which is much lower than the strength of the intermediate body 220 and the intervertebral fusion cage 210.

[0073] The strengths of the intermediate body 220 and the intervertebral fusion cage 210 may be the same or different, which can be achieved by configuring the energy densities corresponding to the intermediate body model 110 and the intervertebral fusion cage model 120 in the laser printing parameters.

[0074] Please continue reading Figure 1 The laser printing method provided in this embodiment may further include:

[0075] Step S103 , printing is performed according to laser printing parameters to obtain a printed structure 200 .

[0076] Please refer to Figure 6 , Figure 6 A partial structural schematic diagram of the printing structure 200 is shown.

[0077] The printed structure 200 corresponds to the structure of the printed model 100 . The printed structure 200 includes a plurality of intervertebral fusion cages 210 arranged in sequence, and an intermediate body 220 between any two adjacent intervertebral fusion cages 210 . Any intervertebral fusion cage 210 is connected to the intermediate body 220 via a virtual connector 230 .

[0078] During the printing process, the printing powders are evenly laid layer by layer to form a powder bed. The powder bed is scanned by a laser beam according to the scanning speed and path corresponding to the laser printing parameters to melt the printing powder to form a molten pool. Each layer of melted printing powder is cooled and solidified to form a solid structure, and then a new printing powder layer is laid, and the scanning process is repeated until the printing structure 200 corresponding to the printing model 100 is printed.

[0079] In order to ensure the stability of the printing process and further improve the printing quality, in this embodiment, step S103 may also include the following sub-steps:

[0080] Monitor heat during printing to obtain heat distribution data;

[0081] Printing parameters are adjusted in real time based on heat distribution data to maintain thermal balance.

[0082] It can be understood that by monitoring the heat changes of different structures and different layer heights during the printing process, the laser printing parameters, mainly the laser power, are dynamically adjusted to maintain the heat balance of different parts of the solid structure formed during the printing process, thereby preventing the printed structure 200 from overheating and deforming, affecting the stability of the printing process.

[0083] Please continue reading Figure 1 The laser printing method provided in this embodiment may further include:

[0084] Step S104 , applying force to destroy the virtual connectors 230 between each intervertebral fusion cage 210 and the intermediate body 220 , so as to remove the intermediate body 220 and obtain a plurality of intervertebral fusion cages 210 .

[0085] After printing is completed, the printed structure 200 is taken out from the powder bed. During the taking-out process, the virtual connector 230 between the support body corresponding to the support body model 140 and the intervertebral fusion cage 210 at the bottom is broken by force, and the remaining part including multiple intervertebral fusion cages 210 and the intermediate body 220 is successfully taken out. By twisting the intervertebral fusion cage 210 or the intermediate body 220 to break the virtual connector 230 between the two, the separation of the intervertebral fusion cage 210 and the intermediate body 220 can be completed, thereby obtaining multiple intervertebral fusion cages 210, which is convenient and quick to operate.

[0086] In summary, the laser printing method for an intervertebral fusion cage provided in this embodiment can significantly improve the production efficiency of the intervertebral fusion cage 210 and reduce the production cost.

[0087] This embodiment also provides an intervertebral fusion cage 210, which is prepared according to the aforementioned laser printing method for intervertebral fusion cages. Benefiting from the beneficial effects of the laser printing method, the intervertebral fusion cage 210 provided in this embodiment has the characteristics of higher preparation efficiency and lower preparation cost.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A laser printing method for an intervertebral fusion cage, characterized in that: include: A printing model (100) is established, comprising an intermediate model (110), an intervertebral fusion cage model (120) and a virtual connection layer (130), wherein a plurality of the intervertebral fusion cage models (120) are arranged in sequence and spaced apart in a vertical direction, the intermediate model (110) is located between any two adjacent intervertebral fusion cage models (120), and any intervertebral fusion cage model (120) is connected to the intermediate model (110) via the virtual connection layer (130); Establishing laser printing parameters according to the printing model (100), wherein the energy density of the laser input corresponding to the virtual connection layer (130) is different from the energy density corresponding to the intermediate model (110) and the intervertebral fusion cage model (120); Printing is performed according to the laser printing parameters to obtain a printed structure (200), wherein the printed structure (200) comprises a plurality of intervertebral fusion cages (210) arranged in sequence, and an intermediate body (220) located between any two adjacent intervertebral fusion cages (210), and any intervertebral fusion cage (210) is connected to the intermediate body (220) via a virtual connector (230); A force is applied to destroy the virtual connector (230) between each intervertebral fusion cage (210) and the intermediate body (220), so as to remove the intermediate body (220) and obtain a plurality of intervertebral fusion cages (210).

2. The laser printing method of the intervertebral fusion cage according to claim 1, characterized in that: The intervertebral fusion cage model (120) has a porous structure, and the pore size of the porous structure is normally distributed between 100 μm and 800 μm, and / or, The porosity of the porous structure is greater than 40%.

3. The laser printing method of the intervertebral fusion cage according to claim 2, characterized in that: The porous structure is a regular structure or a disordered structure.

4. The laser printing method of the intervertebral fusion cage according to claim 1, characterized in that: The bottom end of each intervertebral fusion cage model (120) has a downwardly protruding angle portion (121), and the surface of the corresponding angle portion (121) of the upper one of the two adjacent intervertebral fusion cage models (120) is covered with the virtual connection layer (130), and the angle portion (121) is connected to the corresponding intermediate model (110) through the virtual connection layer (130).

5. The laser printing method of the intervertebral fusion cage according to claim 4, characterized in that: The printed model (100) further comprises a support body model (140), wherein the support body model (140) supports the intervertebral fusion cage model (120) at the bottom of the arrangement queue on the printing substrate, and the angle portion (121) of the intervertebral fusion cage model (120) at the bottom is connected to the support body model (140) via a virtual connection layer (130).

6. The laser printing method of the intervertebral fusion cage according to claim 4, characterized in that: The top of each intervertebral fusion cage model (120) is provided with a chimeric countersunk hole (122) extending vertically downward, the intermediate body model (110) comprises a chimeric rod model (111) and a support cap model (112) connected to the top of the chimeric rod model (111), the bottom end of the chimeric rod model (111) is embedded in the chimeric countersunk hole (122), and the gap between the chimeric rod model (111) and the hole wall of the chimeric countersunk hole (122) is filled by the virtual connection layer (130); The upper surface of the support cap model (112) has a cavity corresponding to the angle portion (121), the angle portion (121) of the corresponding intervertebral fusion cage model (120) is embedded in the cavity, and the gap between the angle portion (121) and the cavity wall of the cavity is filled with the virtual connection layer (130).

7. The laser printing method of the intervertebral fusion cage according to claim 6, characterized in that: The bottom wall of the embedded counterbore (122) has an angled recess (123), and the bottom end of the embedded rod model (111) has an angled protrusion (113), and the angled protrusion (113) is embedded in the angled recess (123).

8. The laser printing method of an intervertebral fusion cage according to claim 1, characterized in that: Compared with the intermediate model (110) and the intervertebral fusion cage model (120), the virtual connection layer (130) has lower strength, and / or, The thickness of the virtual connection layer (130) is between 0.1 mm and 0.5 mm.

9. The laser printing method of an intervertebral fusion cage according to claim 1, characterized in that: The step of printing according to the laser printing parameters to obtain a printed structure (200) comprises: Monitor heat during printing to obtain heat distribution data; Printing parameters are adjusted in real time according to the heat distribution data to maintain heat balance.

10. An intervertebral fusion cage, characterized in that: The intervertebral fusion cage is prepared according to the laser printing method according to any one of claims 1 to 9.

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