Lumbar interbody fusion cage

Abstract

The utility model discloses a lumbar interbody fusion cage, and belongs to the field of orthopedic medical instruments. Slope structures are symmetrically arranged on the top end face and the bottom end face of the lumbar interbody fusion cage along the front end of the lumbar interbody fusion cage, an instrument groove is formed in the rear end of the lumbar interbody fusion cage, supporting outer frames of the same structure are arranged on the top end face and the bottom end face of the lumbar interbody fusion cage, and lattice structures are arranged between the supporting outer frames in a filling mode. The lattice structure is a random lattice structure, the lumbar interbody fusion cage is provided with a bone grafting bin penetrating through the top end face, the lattice structure and the bottom end face, the bone grafting bin is communicated with the lattice structure, and tooth-shaped structures are arranged on the sides, away from the lattice structure, of the supporting outer frames of the top end face and the bottom end face. Wave-shaped structures are arranged on the surfaces of the lattice structures of the top end face and the bottom end face. The intervertebral fusion cage is reasonable in structural design, smooth and efficient in implantation operation, stable and firm in implantation use and good in bone ingrowth effect, and meets the use requirements of intervertebral fusion.

Description

Technical Field

[0001] The utility model belongs to the field of orthopedic medical instruments, and in particular relates to a lumbar intervertebral fusion device. Background Art

[0002] Disc degeneration reduces intervertebral stability, leading to various symptoms for patients, including neuralgia and functional impairment. Intervertebral fusion is a common treatment for disc degeneration. The principle of intervertebral fusion is to remove the degenerated or necrotic disc. An intervertebral fusion cage is then surgically implanted between the patient's vertebrae to widen and correct the distance between the vertebrae. This cage ultimately fuses the upper and lower intervertebral segments, providing greater stability. The cage provides support and load distribution, effectively restoring intervertebral height and the spinal curvature. An intervertebral fusion cage is an implantable medical device used between the upper and lower vertebrae of the human body. It is one of the primary implants used to fuse adjacent intervertebral spaces in the spine, and its safety and effectiveness directly impact the effectiveness of bone fusion between adjacent vertebrae.

[0003] The existing intervertebral fusion device itself is insufficient in strength. During the implantation and use of the intervertebral fusion device, the vertebrae will exert external force on the intervertebral fusion device, which may cause the intervertebral fusion device of insufficient strength to be damaged and fractured. Clinical applications have found that the existing intervertebral fusion device surgical implantation is cumbersome and difficult to achieve smooth and efficient implantation of the intervertebral fusion device. In addition, the existing intervertebral fusion device is prone to loosening, sliding out and falling off during implantation and use. The bone ingrowth effect is poor, which affects the bone fusion effect and leads to non-fusion between the vertebrae. In order to achieve smooth and efficient implantation of the lumbar intervertebral fusion device, stable and firm implantation, and enhance bone ingrowth effect, and improve the fusion efficiency of the lumbar intervertebral fusion device, a new type of lumbar intervertebral fusion device is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a lumbar intervertebral fusion device with reasonable structural design, smooth and efficient implantation operation, stable and firm implantation, good bone ingrowth effect, and meeting the needs of intervertebral fusion.

[0005] In order to solve the above technical problems, the technical solution adopted by the lumbar intervertebral fusion cage of the present invention is:

[0006] The lumbar intervertebral fusion cage includes a top surface, a bottom surface, a side surface, a front end, a rear end and a lattice structure, wherein the top surface and the bottom end surface have the same structure and are symmetrically arranged, the top surface and the bottom end surface are symmetrically arranged with a slope structure along the front end of the lumbar intervertebral fusion cage, and the rear end of the lumbar intervertebral fusion cage is provided with an instrument groove;

[0007] The top and bottom end surfaces of the lumbar intervertebral fusion cage are both provided with support outer frames of the same structure, the lattice structure is filled and arranged between the support outer frames, the lattice structure is a random lattice structure, and the support outer frames are covered on the outer edges of the lattice structure;

[0008] The lumbar intervertebral fusion cage is provided with a bone grafting chamber penetrating the top end surface, the lattice structure and the bottom end surface, and the bone grafting chamber is in communication with the lattice structure;

[0009] The supporting outer frames of the top end surface and the bottom end surface are both provided with tooth structures on the sides away from the lattice structure, and the lattice structure surfaces of the top end surface and the bottom end surface are provided with wavy structures.

[0010] Compared with the existing technology, the present invention has the following advantages and effects: the present invention has a reasonable structural design, and the rear end of the lumbar intervertebral fusion device is provided with an instrument groove, which can be adapted to the clamp used for implantation surgery, and the lumbar intervertebral fusion device can be surgically implanted under the clamping action of the clamp, and the top end surface and the bottom end surface have the same structure and are symmetrically arranged, and the top end surface and the bottom end surface are symmetrically provided with a slope structure along the front end of the lumbar intervertebral fusion device, and the slope structure can facilitate the surgical implantation of the lumbar intervertebral fusion device and realize smooth and efficient surgical implantation of the lumbar intervertebral fusion device, and the lattice structure is a random lattice structure, and the support outer frame is covered on the outer edge of the lattice structure, and the support outer frame can provide structural strength for the entire fusion device, ensuring the stability of the lumbar intervertebral fusion device during implantation and use, and avoiding damage and fracture, and the random lattice structure can improve the bone ingrowth effect, and the support outer frame occupies a smaller area on the outside of the entire lumbar intervertebral fusion device, and when the fusion device is implanted and used, the surfaces of two adjacent vertebrae of the fusion device and the surface of the lattice structure have a larger area. The contact between the bone grafting chamber and the lattice structure can improve the bone ingrowth effect of the fusion device, and the random lattice structure can make the elastic modulus of the lumbar intervertebral fusion device close to the elastic modulus of human bone, which can effectively avoid stress shielding. The lumbar intervertebral fusion device is provided with a bone grafting chamber, which is used to fill the corresponding bone tissue material to help the human bone tissue to grow and form a stable bony connection between adjacent vertebrae. The bone grafting chamber is connected to the lattice structure, so that after the bone grafting chamber is filled with bone tissue material, the bone tissue material can grow and fuse with the random lattice structure corresponding to the inner hole wall of the bone grafting chamber over a large area, shortening the implantation and fusion time of the intervertebral fusion device and improving the fusion efficiency. The support outer frame of the top and bottom surfaces is provided with a tooth structure on the side away from the lattice structure, and the lattice structure surface of the top and bottom surfaces is provided with a wavy structure, so that when the lumbar intervertebral fusion device is implanted and used, it can effectively ensure that the lumbar intervertebral fusion device is occluded and fixed with the two adjacent vertebrae, so that the fusion device is stably and firmly located between the two adjacent vertebrae, meeting the needs of intervertebral fusion.

[0011] Furthermore, windows are symmetrically provided on the side surfaces of both sides of the lumbar intervertebral fusion cage, and the windows are connected to the bone grafting chamber.

[0012] Furthermore, the lumbar intervertebral fusion device is provided with support rings along the side ends and the bone graft chamber ends of the viewing window, and oblique support bars are connected to the outside of the support rings.

[0013] Furthermore, a plurality of oblique support bars are connected to the outer side of the support ring, and the oblique support bars on the outer side of the support ring are symmetrically arranged, and the plurality of oblique support bars form an X-shaped structure with the support ring as the center.

[0014] Furthermore, the front end of the lumbar intervertebral fusion device is a frustoconical structure, the top and bottom end surfaces of the lumbar intervertebral fusion device are arcuate structures, the side surfaces of the lumbar intervertebral fusion device have the same structure and are symmetrically arranged, and the side surfaces of the lumbar intervertebral fusion device are arcuate structures.

[0015] Furthermore, inner support bars are provided on both the top and bottom end surfaces of the lumbar intervertebral fusion cage. At least one inner support bar is provided, and both ends of the inner support bar are fixedly connected to the supporting outer frame.

[0016] Furthermore, the inner support bars of the top end surface and the bottom end surface are provided with tooth structures on the sides away from the lattice structure.

[0017] Furthermore, the instrument slot at the rear end of the lumbar intervertebral fusion device includes a connecting slot and a threaded hole. The threaded hole is arranged in the middle of the rear end of the lumbar intervertebral fusion device, the connecting slots are symmetrically arranged on both sides of the threaded hole, and the threaded hole is connected to the bone grafting chamber.

[0018] Furthermore, the random lattice structure of the lumbar intervertebral fusion cage includes a plurality of random lattice units, and the structure of the random lattice unit includes a trabecular structure and a Thiessen polygon structure.

[0019] Furthermore, the lumbar intervertebral fusion cage is manufactured in one piece through 3D printing.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 This is a schematic diagram of the main structure of a lumbar intervertebral fusion device of the present invention.

[0023] Figure 2The utility model is a schematic diagram of a top view of the structure of a lumbar intervertebral fusion device.

[0024] Figure 3 It is a left-side structural schematic diagram of a lumbar intervertebral fusion device of the present invention.

[0025] Figure 4 It is a right side structural schematic diagram of a lumbar intervertebral fusion device of the present invention.

[0026] Figure 5 It is a cross-sectional view of a lumbar intervertebral fusion cage according to the present invention along the AA direction.

[0027] Figure 6 The utility model is a three-dimensional structural diagram of a lumbar intervertebral fusion device.

[0028] In the figure: 1. top surface, 2. bottom surface, 3. side surface, 4. front end, 5. rear end, 6. lattice structure, 7. slope structure, 8. instrument slot, 9. support outer frame, 10. bone graft chamber, 11. window, 12. support ring, 13. oblique support bar, 14. inner support bar, 15. connecting groove, 16. threaded hole. DETAILED DESCRIPTION

[0029] In order to further describe the present invention, a specific embodiment of a lumbar intervertebral fusion device is further described below with reference to the accompanying drawings. The following embodiments are intended to explain the present invention and the present invention is not limited to the following embodiments.

[0030] This embodiment provides a lumbar intervertebral fusion device for implantation and fixation of lumbar intervertebral fusion. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 6 The lumbar intervertebral fusion device includes a top surface 1, a bottom surface 2, a side surface 3, a front end 4, a rear end 5 and a lattice structure 6. The top surface 1 and the bottom surface 2 have the same structure and are symmetrically arranged. The top surface 1 and the bottom surface 2 are symmetrically provided with a slope structure 7 along the front end 4 of the lumbar intervertebral fusion device. The rear end 5 of the lumbar intervertebral fusion device is provided with an instrument groove 8. The instrument groove 8 can be adapted to the clamp used for implantation surgery. The lumbar intervertebral fusion device can be surgically implanted under the clamping action of the clamp. The slope structure 7 symmetrically arranged on the top surface 1 and the bottom surface 2 can facilitate the surgical implantation of the lumbar intervertebral fusion device and realize a smooth and efficient surgical implantation operation of the lumbar intervertebral fusion device.

[0031] The top surface 1 and the bottom surface 2 of the lumbar intervertebral fusion device are both provided with a support outer frame 9 with the same structure. The lattice structure 6 is filled and arranged between the support outer frames 9. The lattice structure 6 is a random lattice structure. The support outer frame 9 is covered on the outer edge of the lattice structure 6. The support outer frame 9 can provide structural strength for the entire fusion device, ensure the stability of the lumbar intervertebral fusion device during implantation and use, and avoid damage and fracture. The random lattice structure can improve the bone ingrowth effect. The support outer frame 9 occupies a small area on the outside of the entire lumbar intervertebral fusion device. When the fusion device is implanted and used, the surfaces of the two adjacent vertebrae of the fusion device have a large area of ​​contact with the surface of the lattice structure 6, which can improve the bone ingrowth effect of the fusion device, and the random lattice structure can make the elastic modulus of the lumbar intervertebral fusion device close to the elastic modulus of human bone, which can effectively avoid stress shielding.

[0032] The lumbar intervertebral fusion device is provided with a bone grafting chamber 10 that extends through the top surface 1, the lattice structure 6, and the bottom surface 2. The bone grafting chamber 10 is connected to the lattice structure 6. The bone grafting chamber 10 is used to fill the corresponding bone tissue material to help the human bone tissue adhere and grow, so that a stable bony connection is formed between adjacent vertebral bodies. The bone grafting chamber 10 is connected to the lattice structure 6, so that after the bone grafting chamber 10 is filled with bone tissue material, the bone tissue material can contact and grow into the random lattice structure corresponding to the inner hole wall of the bone grafting chamber 10 over a large area, thereby shortening the implantation and fusion time of the intervertebral fusion device and improving the fusion efficiency. This embodiment does not limit the shape of the bone grafting chamber 10, and the bone grafting chamber 10 can be a cylindrical hole, an elliptical hole, a regular polygonal prism hole, or an irregular polygonal prism hole.

[0033] The supporting outer frame 9 of the top end surface 1 and the bottom end surface 2 is provided with a tooth structure on the side away from the lattice structure 6, and the surface of the lattice structure 6 of the top end surface 1 and the bottom end surface 2 is provided with a wavy structure. When the lumbar intervertebral fusion device is implanted and used, it can effectively ensure that the lumbar intervertebral fusion device is occluded and fixed with the two adjacent vertebrae, so that the fusion device is stably and firmly located between the two adjacent vertebrae, meeting the needs of intervertebral fusion. The surface of the lattice structure 6 of the top end surface 1 and the bottom end surface 2 can also be a continuous hill-like structure and a serrated structure similar to the wavy structure. The purpose is to use the undulating structural surface to stably fix it between the adjacent vertebrae, improve the contact and fusion degree between the fusion device and the adjacent vertebrae, and facilitate the growth and fusion of bone tissue.

[0034] See Figure 1 、 Figure 2 、 Figure 5 and Figure 6In some embodiments, windows 11 are symmetrically provided on the sides of both sides of the lumbar intervertebral fusion device, and the windows 11 are arranged in a continuous manner with the bone graft chamber 10. The windows 11 can be used to observe the growth of the bone graft directly or through imaging means after the fusion device is implanted, which helps to evaluate the fusion effect of the fusion device and facilitates and accurately determines whether the bone graft has successfully grown and fused with the surrounding bone tissue. Through observation through the windows 11, the operator can regularly monitor the progress of bone graft fusion, promptly discover any possible fusion obstacles or problems, and thus efficiently take corresponding treatment measures. During the fusion surgical implantation process, the windows 11 can be used as a reference point for implantation, assisting the operator in more accurately positioning and implanting the fusion device. At the same time, using the windows 11 as a reference point, the position of the fusion device can be positioned by imaging means during the use of the fusion device, and it can be observed and confirmed whether the position of the fusion device is offset and skewed compared to the initial implantation position during use, which helps the operator to take corresponding measures. This embodiment does not limit the shape of the window 11. The window 11 can be a variety of through-hole shapes that are set through the bone graft bin 10, including but not limited to cylindrical through-holes, elliptical through-holes, regular polygonal through-holes and irregular polygonal through-holes.

[0035] See Figure 1 、 Figure 5 and Figure 6 In some embodiments, the window 11 of the lumbar intervertebral fusion device is provided with support rings 12 along the 3 ends of the side surfaces and the end of the bone grafting chamber 10. The outside of the support ring 12 is connected with an oblique support bar 13. The support ring 12 provides support strength for both ends of the window 11. The oblique support bar 13 outside the support ring 12 provides support strength for both ends of the window 11 and the two side surfaces 3 of the entire fusion device, thereby preventing the vertebrae from exerting external force on the intervertebral fusion device during implantation and use, thereby preventing the fusion device from being damaged or broken due to insufficient strength. The above structure ensures that when the windows 11 are provided on both sides of the lumbar intervertebral fusion device, the overall stability and firmness of the fusion device can be guaranteed.

[0036] In some embodiments, a plurality of oblique support bars 13 are connected to the outside of the support ring 12. The oblique support bars 13 on the outside of the support ring 12 are symmetrically arranged. The plurality of oblique support bars 13 form an X-shaped structure with the support ring 12 as the center. The overall structure of the X-shaped structure formed by the plurality of oblique support bars 13 is reasonable and has high structural strength. While providing support strength to both ends of the fusion device window 11 and the two side surfaces 3 of the entire fusion device, the area occupied by the plurality of oblique support bars 13 is relatively small. The random lattice structure on the side of the lumbar intervertebral fusion device bone grafting bin 10 and both sides of the entire fusion device can contact the bone tissue over a larger area when implanted and used, thereby improving the efficiency of bone tissue ingrowth and fusion.

[0037] See Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6 In some embodiments, the front end 4 of the lumbar intervertebral fusion device is a frustum-shaped structure. The frustum-shaped front end 4 of the lumbar intervertebral fusion device can facilitate the implantation of the fusion device into the intervertebral space. In the case of limited surgical access, the frustum-shaped front end 4 can more smoothly pass through tissue and bone to achieve fusion device implantation. At the same time, the frustum-shaped structure can better match the vertebral body. During the fusion device surgical implantation, the fusion device can utilize the frustum-shaped structure to stably embed into the intervertebral space, thereby increasing the stability of the fusion device surgical implantation and reducing the risk of displacement of the fusion device after implantation.

[0038] See Figure 1 and Figure 2 The top surface 1 and the bottom surface 2 of the lumbar intervertebral fusion device are arcuate structures, and the side surfaces 3 on both sides of the lumbar intervertebral fusion device have the same structure and are symmetrically arranged. The side surfaces 3 of the lumbar intervertebral fusion device are arcuate structures. The top surface 1, the bottom surface 2 and the side surfaces 3 on both sides of the lumbar intervertebral fusion device all adopt arcuate structures. The fusion device can better match the end plates of the upper and lower vertebrae, thereby providing a more stable contact interface. The arcuate structure design can increase the contact area between the fusion device and the vertebral body, help improve the stability of the fusion device, and reduce the movement of the fusion device in the intervertebral space. The arcuate contact between the arcuate structure of the intervertebral fusion device and the vertebral end plates can more evenly disperse the pressure during implantation and reduce local high-pressure areas. At the same time, the arcuate structure on the surface of the lumbar intervertebral fusion device can make the surgical implantation process of the fusion device smoother, reduce the damage to the soft tissue during the implantation process, and improve the operability of the surgical implantation.

[0039] See Figure 2 、 Figure 4 and Figure 6 In some embodiments, internal support bars 14 are provided on both the top end surface 1 and the bottom end surface 2 of the lumbar intervertebral fusion device. At least one internal support bar 14 is provided, and both ends of the internal support bar 14 are fixedly connected to the supporting outer frame 9, thereby improving the structural strength of the lumbar intervertebral fusion device. The overall structure is stable and firm, and the structural strength of the fusion device meets the needs of fusion device implantation.

[0040] In some embodiments, the inner support bars 14 of the top end surface 1 and the bottom end surface 2 are provided with a toothed structure away from the lattice structure 6. The toothed structure of the inner support bar 14 can be tightly and firmly pressed and fixed to the adjacent lumbar vertebrae, so that the fusion device is stably set between the two adjacent lumbar vertebrae after implantation, avoiding the situation where the fusion device becomes loose, slips out and falls off during use.

[0041] See Figure 3 and Figure 5In some embodiments, the instrument slot 8 of the rear end 5 of the lumbar intervertebral fusion device includes a connecting slot 15 and a threaded hole 16. The threaded hole 16 is arranged in the middle of the rear end 5 of the lumbar intervertebral fusion device, and the connecting slots 15 are symmetrically arranged on both sides of the threaded hole 16. The threaded hole 16 is connected to the bone grafting bin 10. During the fusion device implantation process, the instrument slot 8 can adapt to a variety of clamping tools. The operator can use the clamping tool to stably clamp the lumbar intervertebral fusion device and then implant it into the adjacent lumbar intervertebral space of the patient, thereby improving the convenience of surgical operation and the accuracy of fusion device implantation and installation.

[0042] In some embodiments, the random lattice structure of the lumbar intervertebral fusion device includes a plurality of random lattice units, the structure of the random lattice unit includes a trabecular structure and a Thiessen polygon structure, the random lattice unit contains at least three connecting rod structures, and the connecting rod structures are connected end to end to form a polygon, and the polygon includes but is not limited to a triangle, a quadrilateral, a pentagon, a hexagon, and a heptagon.

[0043] Nodes are formed at the connections of the connecting rods, with the nodes of two adjacent polygons overlapping. Within multiple random lattice units, the connecting rods of two adjacent random lattice units overlap. The porosity of the random lattice structure is the ratio of the volume of the pores between the connecting rods to the volume of the random lattice structure. The porosity of the random lattice structure ranges from 5% to 95%. The pores between the connecting rods are through-holes with a diameter of 100μm to 800μm. The porosity of the random lattice structure is controlled by the diameter, length, and number of the connecting rods. By adjusting the porosity of the random lattice structure, the elastic modulus of the random lattice structure approaches that of human bone. The diameter of the connecting rods in the random lattice structure ranges from 100μm to 400μm, and the length of the connecting rods ranges from 100μm to 2000μm. When the elastic modulus of the intervertebral fusion device is close to that of human bone, problems such as stress shielding can be avoided. When the elastic modulus of the intervertebral fusion device is different from that of human bone, the intervertebral fusion device will cause stress shielding effect after being implanted in the human body, resulting in bone absorption, and then loosening of the intervertebral fusion device, causing failure of the intervertebral fusion device implantation.

[0044] In some embodiments, the lumbar intervertebral fusion cage is manufactured in one piece through 3D printing, and the product processing is efficient and the size is precise.

[0045] The above contents described in this specification are merely examples of the present invention. Those skilled in the art of the present invention may make various modifications, additions, or substitute similar methods to the specific embodiments described, as long as they do not deviate from the contents of this specification or exceed the scope defined by the claims, and shall fall within the scope of protection of the present invention.

Claims

1. A lumbar intervertebral fusion cage, characterized by: The lumbar intervertebral fusion device comprises a top surface (1), a bottom surface (2), a side surface (3), a front end (4), a rear end (5) and a lattice structure (6); the top surface (1) and the bottom surface (2) have the same structure and are symmetrically arranged; the top surface (1) and the bottom surface (2) are symmetrically provided with a slope structure (7) along the front end (4) of the lumbar intervertebral fusion device; and the rear end (5) of the lumbar intervertebral fusion device is provided with an instrument groove (8); The top end surface (1) and the bottom end surface (2) of the lumbar intervertebral fusion device are both provided with a support outer frame (9) of the same structure, the lattice structure (6) is filled and arranged between the support outer frames (9), the lattice structure (6) is a random lattice structure, and the support outer frame (9) is covered on the outer edge of the lattice structure (6); The lumbar intervertebral fusion device is provided with a bone grafting chamber (10) penetrating the top end surface (1), the lattice structure (6) and the bottom end surface (2), and the bone grafting chamber (10) and the lattice structure (6) are in communication; The supporting outer frames (9) of the top end surface (1) and the bottom end surface (2) are both provided with tooth structures on the sides away from the lattice structure (6), and the surfaces of the lattice structures (6) of the top end surface (1) and the bottom end surface (2) are provided with wavy structures.

2. The lumbar intervertebral fusion cage according to claim 1, characterized in that: Windows (11) are symmetrically arranged on the side surfaces (3) of both sides of the lumbar intervertebral fusion device, and the windows (11) are connected to the bone grafting chamber (10).

3. The lumbar intervertebral fusion cage according to claim 2, characterized in that: The window (11) of the lumbar intervertebral fusion device is provided with a support ring (12) along the side (3) end and the bone graft chamber (10) end, and an oblique support bar (13) is connected to the outside of the support ring (12).

4. The lumbar intervertebral fusion cage according to claim 3, characterized in that: A plurality of oblique support bars (13) are connected to the outside of the support ring (12), the oblique support bars (13) on the outside of the support ring (12) are symmetrically arranged, and the plurality of oblique support bars (13) form an X-shaped structure with the support ring (12) as the center.

5. The lumbar intervertebral fusion cage according to claim 1, characterized in that: The front end (4) of the lumbar intervertebral fusion device is a cone-shaped structure, the top end surface (1) and the bottom end surface (2) of the lumbar intervertebral fusion device are arcuate structures, and the side surfaces (3) on both sides of the lumbar intervertebral fusion device have the same structure and are symmetrically arranged, and the side surfaces (3) of the lumbar intervertebral fusion device are arcuate structures.

6. The lumbar intervertebral fusion cage according to claim 1 or 5, characterized in that: The top end surface (1) and the bottom end surface (2) of the lumbar intervertebral fusion device are both provided with inner support bars (14), at least one inner support bar (14) is provided, and both ends of the inner support bar (14) are fixedly connected to the supporting outer frame (9).

7. The lumbar intervertebral fusion cage according to claim 6, characterized in that: The inner support bars (14) of the top end surface (1) and the bottom end surface (2) are provided with tooth-shaped structures on the sides away from the lattice structure (6).

8. The lumbar intervertebral fusion cage according to claim 1 or 7, characterized in that: The instrument slot (8) at the rear end (5) of the lumbar intervertebral fusion device comprises a connecting slot (15) and a threaded hole (16). The threaded hole (16) is arranged in the middle of the rear end (5) of the lumbar intervertebral fusion device. The connecting slots (15) are symmetrically arranged on both sides of the threaded hole (16). The threaded hole (16) is connected to the bone graft chamber (10).

9. The lumbar intervertebral fusion cage according to claim 1, characterized in that: The random lattice structure of the lumbar intervertebral fusion device includes a plurality of random lattice units, and the structure of the random lattice unit includes a trabecular structure and a Thiessen polygon structure.

10. The lumbar intervertebral fusion cage according to claim 1 or 9, characterized in that: The lumbar intervertebral fusion cage is manufactured in one piece through 3D printing.

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