3D printing porous combined titanium mesh fusion cage based on topological optimization

Abstract

The utility model discloses a 3D printing porous combined titanium mesh fusion cage based on topological optimization, and relates to the technical field of medical instruments, and the 3D printing porous combined titanium mesh fusion cage comprises a titanium mesh center body and a reinforcing member; one of the reinforcing piece and the titanium mesh center body is provided with at least two screwing parts, and the other one of the reinforcing piece and the titanium mesh center body is provided with at least two screwing grooves; the screwing parts and the screwing grooves spirally extend in the length direction of the titanium mesh center body. The screwing parts are screwed into the corresponding screwing grooves, so that the reinforcing piece and the titanium mesh center body can be quickly matched; different reinforcers or titanium mesh center bodies can be conveniently replaced according to user requirements, different reinforcers and different titanium mesh center bodies can be combined to form titanium mesh fusion devices of different specifications, the flexibility is high, and the stocking pressure is reduced; the number of the screwing parts and the screwing grooves is at least two, and the stability of connection between the reinforcing piece and the titanium mesh center body can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and specifically relates to a 3D printed porous combined titanium mesh fusion device based on topology optimization. Background Technology

[0002] Anterior cervical corpectomy and fusion (ACCF) primarily involves exposing the affected vertebral segment via an anterior cervical approach, removing the diseased vertebral body and intervertebral disc, and decompressing the spinal cord and nerves. Subsequently, the surgical segment is fused and fixed using bone graft materials such as titanium mesh fusion cages and an anterior cervical fixation plate system, thereby restoring the anatomical integration and biomechanical stability of the surgical segment. The titanium mesh fusion cage, as a bone graft material, provides excellent support, ensuring cervical spine stability. Furthermore, the titanium mesh fusion cage also promotes bone healing and reduces complications. Therefore, using an appropriate titanium mesh fusion cage and selecting the correct mesh size and implantation location are crucial for the success of ACCF surgery.

[0003] Due to the variability in vertebral body size among humans, different users require titanium mesh fusion devices of different sizes. However, traditional cut-and-place titanium mesh fusion devices are prone to stress concentration after implantation, leading to mesh subsidence. Although there are fewer available sizes, their adaptability is poor. On the other hand, one-piece titanium mesh devices, which offer better adaptability, require manufacturers to produce a large number of different sizes for various applications, significantly increasing production costs. Utility Model Content

[0004] The purpose of this invention is to provide a 3D-printed porous modular titanium mesh fusion device based on topology optimization. It can be assembled into titanium mesh fusion devices of different specifications by using different titanium mesh centers and different reinforcing parts, which is highly flexible and reduces inventory costs.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0006] This utility model embodiment provides a 3D-printed porous composite titanium mesh fusion device based on topology optimization, comprising:

[0007] Titanium mesh center body;

[0008] A reinforcing member; one of the reinforcing member and the titanium mesh center body is provided with at least two engagement portions, and the other is provided with at least two engagement grooves; at least two engagement portions are spaced apart along the circumferential direction of the titanium mesh center body, and at least two engagement grooves are spaced apart along the circumferential direction of the titanium mesh center body; and both the engagement portions and the engagement grooves extend spirally along the length direction of the titanium mesh center body;

[0009] The screw-in portion is screwed into the corresponding screw-in groove, so that the reinforcing member is fixed to the center body of the titanium mesh.

[0010] According to an embodiment of the present invention, a 3D-printed porous combined titanium mesh fusion device based on topology optimization is provided, wherein the swivel part has a swivel wall, and the swivel groove has an attachment wall that fits against the swivel wall; the swivel wall has a first corner portion and a second corner portion arranged diagonally, and the attachment wall has a third corner portion that fits against the first corner portion and a fourth corner portion that fits against the second corner portion;

[0011] The first corner portion and the third corner portion extend in a direction opposite to the extending direction of the screw-in portion;

[0012] And / or, the second corner portion and the fourth corner portion extend in a direction opposite to the extension direction of the screw portion.

[0013] According to an embodiment of the present invention, a 3D-printed porous combined titanium mesh fusion device based on topology optimization has a bone graft hole extending along its length direction. The fusion portion includes a first frame and a first filling portion. The first frame has a filling groove arranged radially along the bone graft hole, and the first filling portion fills the filling groove. A retaining wall is provided on one side of the fusion groove, and the retaining wall extends along the circumferential direction of the titanium mesh center body. Both the first filling portion and the retaining wall are porous structures.

[0014] According to an embodiment of the present invention, a 3D-printed porous combined titanium mesh fusion device based on topology optimization is provided, wherein the reinforcing member includes a reinforcing shell and a second filling part, the reinforcing shell being connected to the first frame; the second filling part filling the interior of the reinforcing shell; and the second filling part having a porous structure.

[0015] According to an embodiment of the present invention, a 3D-printed porous combined titanium mesh fusion device based on topology optimization is provided on the end face of the reinforcing member, and the first through hole connects to the interior of the reinforcing shell.

[0016] According to an embodiment of the present invention, in a 3D-printed porous combined titanium mesh fusion device based on topology optimization, the end face of the reinforcing member is inclined in the length direction of the titanium mesh center body.

[0017] According to an embodiment of the present invention, a 3D-printed porous combined titanium mesh fusion device based on topology optimization is provided, wherein two reinforcing members are provided, one of which is installed at one end of the titanium mesh center body, and the other of which is installed at the other end of the titanium mesh center body; the end face of one of the reinforcing members has a different inclination direction than the end face of the other reinforcing member.

[0018] According to an embodiment of the present invention, a 3D-printed porous combined titanium mesh fusion device based on topology optimization is provided. The titanium mesh center body includes a support frame and two second frames. The support frame connects the two second frames, and the swivel groove is formed on the second frames. The support frame includes at least two connecting segments and at least two merging segments. At least two of the connecting segments are arranged circumferentially along the centerline of the titanium mesh center body, and the connecting segments are used to connect to the second frames. The merging segments connect two adjacent connecting segments.

[0019] According to an embodiment of the present invention, a 3D-printed porous combined titanium mesh fusion device based on topology optimization is provided, wherein the titanium mesh center body includes a support member, the support member connecting two second frames; the support member has a porous structure, and the support frame is located inside the support member.

[0020] According to an embodiment of the present invention, a 3D-printed porous combined titanium mesh fusion device based on topology optimization is provided on the support member, wherein the support member is provided with a holding through hole for a holding tool to pass through; a support ring is provided on the holding through hole, and the holding through hole is located between two adjacent merging segments.

[0021] The present invention has at least the following beneficial effects:

[0022] By screwing the coupling part into the corresponding coupling groove, the reinforcing member and the titanium mesh center body can be quickly fitted together. This allows for easy replacement of different reinforcing members or titanium mesh center bodies according to user needs. Different specifications of titanium mesh fusion units can be formed by combining different reinforcing members and titanium mesh center bodies, offering high flexibility and reducing inventory pressure. With at least two coupling parts and coupling grooves, the stability of the connection between the reinforcing member and the titanium mesh center body is improved. Both the coupling part and the coupling groove extend spirally along the length of the titanium mesh center body, allowing the coupling part to engage with the coupling groove by screwing it in, reducing processing costs while ensuring reliable connection. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 This is a schematic diagram of the overall structure of the 3D-printed porous combined titanium mesh fusion device based on topology optimization provided in this embodiment of the utility model.

[0025] Figure 2 This is a schematic diagram of the overall structure of the reinforcing member of the 3D-printed porous combined titanium mesh fusion device based on topology optimization provided in this embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the overall structure of the titanium mesh center body of the 3D-printed porous combined titanium mesh fusion device based on topology optimization provided in this embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the overall structure of the second frame of the 3D-printed porous combined titanium mesh fusion device based on topology optimization provided in this embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the overall structure of the reinforcing member of the 3D-printed porous combined titanium mesh fusion device based on topology optimization provided in this embodiment of the utility model;

[0029] Figure 6 This is a schematic diagram of the internal structure of the titanium mesh center body of the 3D-printed porous combined titanium mesh fusion device based on topology optimization provided in this embodiment of the utility model.

[0030] The following labels are shown in the attached diagram:

[0031] 100. Titanium mesh center body; 110. Spinning groove; 120. Fitting wall; 121. Third corner; 122. Fourth corner; 130. Support frame; 131. Connecting section; 131a. First connecting section; 131b. Second connecting section; 132. Converging section; 133. Connecting section; 140. Second frame; 141. Enclosing wall; 142. Support bar; 150. Support component; 151. Holding through hole; 152. Support ring; 161. Third through hole; 162. Fifth through hole;

[0032] 200, Reinforcing member; 210, Screw-in part; 220, Screw-in wall; 221, First corner part; 222, Second corner part; 230, First frame; 231, Filling groove; 240, First filling part; 250, Reinforcing shell; 260, Second filling part; 271, First through hole; 272, Second through hole; 273, Fourth through hole; 280, End face; 281, Pyramidal spike;

[0033] 300. Bone graft hole. Detailed Implementation

[0034] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0035] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0037] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0038] Reference Figures 1 to 6 The following are several embodiments of the 3D-printed porous combined titanium mesh fusion device based on topology optimization of this utility model.

[0039] like Figures 1 to 3 As shown, the 3D-printed porous combined titanium mesh fusion device based on topology optimization of this utility model includes a titanium mesh center body 100 and a reinforcing member 200; one of the reinforcing member 200 and the titanium mesh center body 100 is provided with at least two screw-in portions 210, and the other is provided with at least two screw-in grooves 110; the at least two screw-in portions 210 are spaced apart along the circumferential direction of the titanium mesh center body 100, and the at least two screw-in grooves 110 are spaced apart along the circumferential direction of the titanium mesh center body 100; and both the screw-in portions 210 and the screw-in grooves 110 extend spirally along the length direction of the titanium mesh center body 100; the screw-in portions 210 are screwed into the corresponding screw-in grooves 110, so that the reinforcing member 200 is fixed to the titanium mesh center body 100.

[0040] By screwing the screw-in part 210 into the corresponding screw-in groove 110, the reinforcing member 200 and the titanium mesh center body 100 can be quickly fitted together. This allows for easy replacement of different reinforcing members 200 or titanium mesh center bodies 100 according to user needs. Different specifications of titanium mesh fusion devices can be formed by combining different reinforcing members 200 and different titanium mesh center bodies 100, offering high flexibility and reducing inventory pressure. At least two screw-in parts 210 and screw-in grooves 110 are provided, which improves the stability of the connection between the reinforcing member 200 and the titanium mesh center body 100. Both the screw-in part 210 and the screw-in groove 110 extend spirally along the length of the titanium mesh center body 100, allowing the screw-in part 210 to engage with the screw-in groove 110 by screwing it in, reducing processing costs while ensuring reliable connection. Figure 1 In the figure, direction a is the extension direction of the engagement part 210 and the engagement groove 110.

[0041] The reinforcing member 200 increases the contact area between the titanium mesh fusion device and the vertebral endplate, thereby reducing stress concentration. In this embodiment, the reinforcing member 200 and the titanium mesh center body 100 are modularized. The reinforcing member 200 and the titanium mesh center body 100 can be connected via a simple screw-in operation. During use, only the appropriate reinforcing member 200 and the titanium mesh center body 100 need to be selected and assembled according to the patient's needs, reducing the number of parts, lowering the manufacturer's inventory pressure, and reducing production costs. Compared to interference fits and threaded fits, the screw-in operation in this embodiment is simple and quick, enabling rapid connection between the titanium mesh center body 100 and the reinforcing member 200. Furthermore, the machining of the screw-in part 210 and the screw-in groove 110 is simple, with lower requirements for machining precision, making it suitable for 3D printing technology. This facilitates the machining of porous structures inside the reinforcing member 200 or the titanium mesh center body 100 using 3D printing technology.

[0042] Generally, the titanium mesh center body 100 is cylindrical, and the reinforcing member 200 is annular.

[0043] In some embodiments, such as Figure 2 and Figure 4As shown, the screw-fitting part 210 has a screw-fitting wall 220, and the screw-fitting groove 110 has a fitting wall 120 that fits against the screw-fitting wall 220. By fitting the screw-fitting wall 220 and the fitting wall 120, the friction between the screw-fitting wall 220 and the fitting wall 120 is increased, thereby improving the reliability of the connection between the screw-fitting part 210 and the screw-fitting groove 110. The bottom wall of the screw-fitting groove 110 can be the fitting wall 120, and the top wall of the screw-fitting part 210 can be the screw-fitting wall 220. Alternatively, the side wall of the screw-fitting groove 110 can be the fitting wall 120, and the side wall of the screw-fitting part 210 can be the screw-fitting wall 220. In this invention, the two opposite side walls of the screw-fitting groove 110 are both fitting walls 120, and the two fitting walls 120 are arranged along the circumferential direction of the titanium mesh center body 100. Correspondingly, the two opposite side walls of the screw-fitting part 210 are both screw-fitting walls 220.

[0044] In some embodiments, such as Figure 2 As shown, the screw-fit wall 220 has a first corner portion 221 and a second corner portion 222 arranged diagonally, and the fitting wall 120 has a third corner portion 121 that fits into the first corner portion 221 and a fourth corner portion 122 that fits into the second corner portion 222; the first corner portion 221 and the third corner portion 121 extend in a direction opposite to the extending direction of the screw-fit portion 210.

[0045] Understandably, the first corner portion 221 extends in the opposite direction to the extension direction of the screw-in portion 210, causing the surface of the screw-in wall 220 to be curved or bent, reducing the risk of relative displacement between the screw-in groove 110 and the screw-in portion 210. The third corner portion 121 extends in the opposite direction to the extension direction of the screw-in portion 210, causing the third corner portion 121 to form the same curve or bend as the first corner portion 221, which is more conducive to the fit between the screw-in groove 110 and the screw-in portion 210.

[0046] In some embodiments, such as Figure 2 As shown, the second corner portion 222 extends in the opposite direction to the extension direction of the screw-in portion 210, causing the surface of the screw-in wall 220 to be curved or bent, reducing the risk of relative displacement between the screw-in groove 110 and the screw-in portion 210. The fourth corner portion 122 extends in the opposite direction to the extension direction of the screw-in portion 210, causing the fourth corner portion 122 to form the same curve or bend as the second corner portion 222, which is more conducive to the fit between the screw-in groove 110 and the screw-in portion 210.

[0047] In some embodiments, such as Figure 2 and Figure 4 As shown, both the engagement wall 220 and the mating wall 120 are arc-shaped. The arc-shaped structure can limit the relative displacement between the engagement groove 110 and the engagement part 210, thereby improving the reliability of the fit between the engagement groove 110 and the engagement part 210.

[0048] In the embodiments of this utility model, such as Figure 2 and Figure 4 As shown, the first corner portion 221 and the third corner portion 121 extend in the opposite direction to the extension direction of the screw-in portion 210, and the second corner portion 222 extends in the opposite direction to the extension direction of the screw-in portion 210. Both the screw-in wall 220 and the mating wall 120 are arc-shaped. Through the special arc surface design of the screw-in wall 220 and the mating wall 120, the screw-in portion 210 can be screwed into the screw-in groove 110 and the two can be kept stably connected. During the operation, the assembly and disassembly between the titanium mesh center body 100 and the reinforcing member 200 can be quickly completed by rotation and axial displacement. Furthermore, during and after implantation, the relative displacement between the titanium mesh center body 100 and the reinforcing member 200 can be limited by a single stress, which can effectively prevent the two from accidentally separating and ensure the stability of the assembled structure.

[0049] In some embodiments, such as Figure 1 As shown, the 3D-printed porous composite titanium mesh fusion device has a bone graft hole 300 extending along its length. After implantation, the bone graft hole 300 can communicate with the vertebral endplate. The interior of the bone graft hole 300 is used to accommodate autologous bone or artificial bone and achieves the effect of postoperative bone graft fusion. This further realizes the fusion of bone grafts between the upper and lower vertebral bodies, bone graft tissue, and between the upper and lower vertebral bodies, achieving a more comprehensive bone integration effect.

[0050] In some embodiments, such as Figure 2 and Figure 5 As shown, the screw-in portion 210 includes a first frame 230 and a first filling portion 240. The first frame 230 has a filling groove 231 arranged in the radial direction along the bone graft hole 300, and the first filling portion 240 fills the filling groove 231. A retaining wall 141 is provided on one side of the screw-in groove 110, and the retaining wall 141 extends along the circumferential direction of the titanium mesh center body 100. Both the first filling portion 240 and the retaining wall 141 are porous structures.

[0051] The porous structure provides ample pore space, offering sufficient room for bone cell growth. As bone tissue gradually grows and permeates these pores, the titanium mesh fusion device integrates better with the bone tissue, promoting bone healing and fusion. The precise control of 3D printing allows for optimization of the pore size, shape, and distribution, thereby accelerating the healing process. Furthermore, titanium's extremely high strength and corrosion resistance, combined with the porous structure manufactured using 3D printing technology, significantly reduces overall weight while maintaining sufficient strength, helping to reduce the burden on the body from long-term implants.

[0052] like Figure 2 , Figure 4 and Figure 5As shown, the first filling part 240 is a porous structure. This porous structure, as the filling material for the screw-in part 210, further reduces stiffness while ensuring overall mechanical properties, effectively mitigating stress shielding effects. Both the first filling part 240 and the enclosure wall 141 are porous structures. These porous structures form growth channels, providing an ideal microenvironment for the migration, proliferation, and differentiation of bone cells, promoting bone tissue regeneration and ingrowth. Through bone tissue ingrowth within the porous structure, effective integration between bone tissue and the prosthesis can be achieved, enhancing the overall stability of the bone repair site. Simultaneously, the growth and differentiation of bone cells within the growth channels strengthens the connection between the titanium mesh center body 100 and the reinforcing member 200.

[0053] In some embodiments, such as Figure 3 and Figure 6 As shown, the titanium mesh center body 100 includes a support frame 130 and two second frames 140. The support frame 130 connects the two second frames 140, and a swivel groove 110 is formed on the second frames 140. The support frame 130 includes at least two connecting sections 131 and at least two converging sections 132. The at least two connecting sections 131 are arranged circumferentially along the centerline of the titanium mesh center body 100, and the connecting sections 131 are used to connect to the second frames 140. The converging sections 132 connect two adjacent connecting sections 131. Figure 4 As shown, a support bar 142 can be provided on the second frame 140. The support bar 142 is connected to the two side walls of the filling groove 231 and is used to support the enclosure wall 141. The support bar 142 extends along the circumferential direction of the titanium mesh center body. Multiple support bars 142 are provided, and multiple support bars 142 form a ring on the first frame 230.

[0054] The support frame 130 and the two second frames 140 are solid supports, ensuring that the product meets mechanical stress requirements. At least two connecting segments 131 are arranged circumferentially along the centerline of the titanium mesh center body 100 to provide support from the circumferential direction of the multiple titanium mesh center bodies 100. The merging segment 132 connects two adjacent connecting segments 131, and the merging segment 132 plays a role in distributing the stress and reducing structural fatigue. Compared with traditional structures, this design can achieve higher compressive strength with lower stiffness, thereby improving mechanical performance while effectively reducing the stress shielding effect after implantation. In addition, this structure optimizes the stress distribution inside the fusion device, making it more uniform and reasonable, and providing a guarantee for the good realization of mid- to long-term bone graft fusion results.

[0055] The support frame 130, as the core stress-bearing structure of the titanium mesh center body 100, is designed using a variable density method and topology optimization based on simulations of the product's physiological conditions after implantation in the human body. This process removes areas of low stress, achieving optimal structural morphology and highly uniform stress distribution. Compared to traditional structural designs, this support frame significantly reduces the overall stiffness of the fusion device while maintaining high compressive strength, thereby improving overall mechanical performance and effectively alleviating stress shielding after implantation.

[0056] The connecting segment 131 includes a first connecting segment 131a and a second connecting segment 131b. The first connecting segment 131a connects to one of the second frames 140, and the second connecting segment 131b connects to the other second frame 140. One end of the converging segment 132 is connected to the first connecting segment 131a, and the other end is connected to the second connecting segment 131b. The support frame 130 also includes a connecting segment 133, through which two adjacent converging segments 132 can be connected.

[0057] In some embodiments, such as Figure 3 As shown, the titanium mesh center body 100 includes a support member 150, which connects two second frames 140; the support member 150 has a porous structure, and the support frame 130 is located inside the support member 150.

[0058] Among them, the support member 150, as the material of the titanium mesh center body 100, not only further reduces stiffness while ensuring overall mechanical properties, but also effectively mitigates stress shielding effect; the support member 150 is a porous structure, which not only reduces the overall stiffness of the fusion device and alleviates stress shielding effect, but also promotes early bone tissue growth and effectively promotes integration between surrounding bone tissue and prosthesis, thereby significantly enhancing the local mechanical stability of the bone defect repair area; the support member 150 is a 3D printed porous structure with good biological properties, which can effectively promote early bone tissue formation; the support frame 130 is located inside the support member 150 to improve the overall structural strength of the titanium mesh center body 100.

[0059] In some embodiments, such as Figure 3As shown, the support member 150 is provided with a holding through hole 151 for a holding tool to pass through. The holding through hole 151 is located between two adjacent confluence sections 132. The holding through hole 151 allows for easy and efficient assembly of the titanium mesh fusion device and the holding device, facilitating the surgeon to precisely implant the fusion device into the target location in the patient's body using a holding tool (e.g., a holding device). For ease of surgical operation, the holding through hole 151 is located at the center of the support member 150, which makes it easier to pass the holding tool through the holding through hole 151. A support ring 152 can be provided on the holding through hole 151 to prevent deformation of the holding through hole 151. The holding through hole 151 is located between two adjacent confluence sections 132, which improves the structural stability of the holding through hole 151 while preventing the holding tool passing through the holding through hole 151 from damaging the support frame 130.

[0060] In some embodiments, such as Figure 2 As shown, the reinforcing member 200 includes a reinforcing shell 250 and a second filling portion 260, which fills the interior of the reinforcing shell 250; the second filling portion 260 has a porous structure.

[0061] The second filling part 260 is filled inside the reinforcing shell 250, and the second filling part 260 has a porous structure. The porous structure exhibits superior biological performance while ensuring structural mechanical integrity and connectivity.

[0062] In some embodiments, such as Figure 2 As shown, the end face 280 of the reinforcing member 200 is provided with a first through hole 271, which connects to the interior of the reinforcing shell 250. Bone cells can grow within the first through hole 271 and the second filling portion 260, further enhancing the osseointegration effect between the titanium mesh fusion device and the vertebral endplate, laying a solid foundation for the success of spinal fusion surgery and the patient's rehabilitation.

[0063] In some embodiments, such as Figure 2 and Figure 5 As shown, the first frame 230 is an annular piece, and the first frame 230 is bent to form a filling groove 231; a second through hole 272 can be provided at the bottom of the filling groove 231; as shown Figure 3 and Figure 4As shown, the second frame 140 is an annular sheet. The second frame 140 is bent to form a spiral groove 110. A third through hole 161 is provided at the bottom of the spiral groove 110. The third through hole 161 is connected to the second through hole 272 to facilitate the growth and differentiation of bone cells. The second frame 140 is provided with a fifth through hole 162, which is located between two adjacent spiral grooves 110. The fifth through hole 162 can provide growth space for bone cells. A fourth through hole 273 can be provided on the reinforcing shell 250 to connect with the filling through groove 231, increasing the communication space inside the reinforcing member 200, which is more beneficial to the growth and differentiation of bone cells. The reinforcing shell 250 and the first frame 230 are integrally formed.

[0064] In some embodiments, such as Figure 1 and Figure 2 As shown, the end face 280 of the reinforcing member 200 is inclined along the length of the titanium mesh center body 100, which facilitates perfect fit with the vertebral endplate after implantation, thereby ensuring precise adaptation of the fusion device to the patient's vertebral anatomy. The end face 280 of the reinforcing member 200 is inclined along the length of the titanium mesh center body 100, meaning it is set at a certain angle to the horizontal direction. This is to ensure the fusion device matches the vertebral endplate after implantation, increasing the contact area between the titanium mesh and the vertebral endplate and reducing stress concentration. Furthermore, multiple pyramidal spikes 281 can be arranged on the end face 280 of the reinforcing member 200 to increase the friction between the reinforcing member 200 and the vertebral endplate, preventing movement of the titanium mesh fusion device after implantation into the cervical spine, enhancing the anti-displacement ability of the fusion device after implantation, and significantly improving postoperative stability. The number of pyramidal spikes 281 can be set according to actual needs, and this embodiment of the invention does not impose a particular limitation on this.

[0065] In some embodiments, such as Figure 1 and Figure 2 As shown, two reinforcing members 200 are provided. One reinforcing member 200 is installed at one end of the titanium mesh center body 100, and the other reinforcing member 200 is installed at the other end of the titanium mesh center body 100. The end faces 280 of the one reinforcing member 200 and the end faces 280 of the other reinforcing member 200 have different inclination directions. The different inclination directions of the end faces 280 of the two reinforcing members 200 allow the reinforcing member 200 to be smoothly inserted into the patient's vertebral body even with a certain angular deviation, reducing the requirement for excessive precision and simplifying assembly. Of course, in other embodiments, the inclination directions of the end faces 280 of the two reinforcing members 200 can be the same, and this embodiment of the present invention does not impose any particular limitation on this.

[0066] In this embodiment, the reinforcing member 200 is provided with four equidistant engagement portions 210, and correspondingly, one end of the titanium mesh center body 100 is provided with four engagement grooves 110. Assuming the relative angle between the reinforcing member 200 and the titanium mesh center body 100 is 0°, the end faces 280 of the two reinforcing members 200 have the same inclination direction. Then, through relative rotation between the reinforcing member 200 and the titanium mesh center body, the relative angle between the reinforcing member 200 and the titanium mesh center body 100 becomes 180°. At this time, the end face 280 of one reinforcing member 200 has an opposite inclination direction to the end face 280 of the other reinforcing member 200. That is, by adjusting the axial positional relationship between the reinforcing member 200 and the titanium mesh center body 100, the end face 280 of the reinforcing member 200 can better conform to the patient's vertebral body. To match the angle of the vertebral endplate, the reinforcing member 200 can be configured in multiple sizes, with different sizes of reinforcing members 200 having different tilt angles on their end faces 280 (e.g., 0°, 5°, 10°, 15°). Assuming the angle between the patient's upper vertebral endplate and the horizontal plane is 5° and the angle between the lower vertebral endplate and the horizontal plane is -5°, it is sufficient to use two reinforcing members 200 with an end face 280 angle of 5° to install on the corresponding titanium mesh center body 100, and set the relative angle between the two reinforcing members 200 to 180° (i.e., the tilt directions of the end faces 280 of the two reinforcing members 200 are opposite).

[0067] This utility model embodiment achieves assembly and disassembly through a simple rotational action between the reinforcing member 200 and the titanium mesh center body 100. Compared with the interference fit or set screw locking method commonly used in the current market, the structure of this utility model embodiment is simpler, the operation is more convenient, and the safety is significantly improved.

[0068] During surgery, clinicians can select a titanium mesh center body 100 with appropriate diameter and height to match the patient's vertebral body size according to the patient's actual needs, and select a reinforcing member 200 with an appropriate tilt angle to match the patient's superior and inferior endplate angles, thereby achieving product adaptation to the patient's vertebral body anatomy. After assembly, the processed autologous bone or allogeneic bone is implanted into the bone graft hole 300 of the fusion device, and the bone graft hole 300 is filled to ensure the final effect of bone graft fusion. The titanium mesh fusion device is assembled with the holder through the holding through hole 151, and the fusion device prosthesis is implanted into the patient's vertebral body resection portion using the holder to ensure a tight fit.

[0069] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A 3D-printed porous composite titanium mesh fusion device based on topology optimization, characterized in that, include: Titanium mesh center body (100); A reinforcing member (200); one of the reinforcing member (200) and the titanium mesh center body (100) is provided with at least two engagement portions (210), and the other is provided with at least two engagement grooves (110); at least two engagement portions (210) are spaced apart along the circumferential direction of the titanium mesh center body (100), and at least two engagement grooves (110) are spaced apart along the circumferential direction of the titanium mesh center body (100); and both the engagement portions (210) and the engagement grooves (110) extend spirally along the length direction of the titanium mesh center body (100); The screw-in portion (210) is screwed into the corresponding screw-in groove (110), so that the reinforcing member (200) is fixed to the titanium mesh center body (100).

2. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to claim 1, characterized in that, The screw-in portion (210) has a screw-in wall (220), and the screw-in groove (110) has a fitting wall (120) that fits into the screw-in wall (220); the screw-in wall (220) has a first corner portion (221) and a second corner portion (222) arranged diagonally, and the fitting wall (120) has a third corner portion (121) that fits into the first corner portion (221) and a fourth corner portion (122) that fits into the second corner portion (222); The first corner portion (221) and the third corner portion (121) extend in a direction opposite to the extension direction of the screw-in portion (210); And / or, the second corner portion (222) and the fourth corner portion (122) extend in a direction opposite to the extension direction of the screw portion (210).

3. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to claim 1, characterized in that, The 3D-printed porous composite titanium mesh fusion device has a bone graft hole (300) extending along its length; the fusion part (210) includes a first frame (230) and a first filling part (240), the first frame (230) has a filling groove (231) arranged in the radial direction along the bone graft hole (300), and the first filling part (240) fills the filling groove (231); a retaining wall (141) is provided on one side of the fusion groove (110), and the retaining wall (141) extends along the circumferential direction of the titanium mesh center body (100); both the first filling part (240) and the retaining wall (141) are porous structures.

4. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to claim 3, characterized in that, The reinforcing member (200) includes a reinforcing shell (250) and a second filling part (260). The reinforcing shell (250) is connected to the first frame (230). The second filling part (260) fills the interior of the reinforcing shell (250). The second filling part (260) has a porous structure.

5. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to claim 4, characterized in that, The end face (280) of the reinforcing member (200) is provided with a first through hole (271), which connects to the interior of the reinforcing shell (250).

6. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to any one of claims 1 to 5, characterized in that, The end face (280) of the reinforcing member (200) is inclined in the length direction of the titanium mesh center body (100).

7. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to claim 6, characterized in that, Two reinforcing members (200) are provided, one of which is installed at one end of the titanium mesh center body (100), and the other is installed at the other end of the titanium mesh center body (100); the end face (280) of one of the reinforcing members (200) has a different inclination direction than the end face (280) of the other reinforcing member (200).

8. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to any one of claims 1 to 5, characterized in that, The titanium mesh center body (100) includes a support frame (130) and two second frames (140), the support frame (130) connecting the two second frames (140), and the spiral groove (110) formed on the second frames (140); the support frame (130) includes at least two connecting segments (131) and at least two merging segments (132); at least two of the connecting segments (131) are arranged circumferentially along the center line of the titanium mesh center body (100), and the connecting segments (131) are used to connect to the second frames (140); the merging segments (132) connect two adjacent connecting segments (131).

9. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to claim 8, characterized in that, The titanium mesh center body (100) includes a support member (150) that connects two second frames (140); the support member (150) has a porous structure and the support frame (130) is located inside the support member (150).

10. The 3D-printed porous composite titanium mesh fusion device based on topology optimization according to claim 9, characterized in that, The support member (150) is provided with a holding through hole (151) for a holding tool to pass through; a support ring (152) is provided on the holding through hole (151) and the holding through hole (151) is located between two adjacent confluence segments (132).

Images