Porous interbody fusion cage

Abstract

The utility model discloses a porous interbody fusion cage, and belongs to the field of orthopedic medical instruments. A fusion frame is filled with a porous structure, the whole porous interbody fusion cage is of a flat structure, the cross section of the porous interbody fusion cage is of an oval-like structure, the two sides of the porous interbody fusion cage in the height direction comprise a top end face and a bottom end face, and the two ends of the porous interbody fusion cage in the length direction comprise an implantation front end and an implantation rear end. The two sides of the multi-hole type interbody fusion cage in the width direction comprise a front side face and a back side face, the implantation front end of the multi-hole type interbody fusion cage is of a conical structure, the implantation rear end of the multi-hole type interbody fusion cage is provided with an instrument groove structure, the side portion of a bone grafting bin of the multi-hole type interbody fusion cage is communicated with the multi-hole structure, and fusion frames on the top end face and the bottom end face are provided with tooth-shaped structures. 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 porous 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. It also affects the bone fusion effect due to poor bone ingrowth, resulting in non-fusion between the vertebrae. In order to achieve smooth and efficient implantation of the intervertebral fusion device, stable and firm implantation, and enhance bone ingrowth effect, and improve the fusion efficiency of the intervertebral fusion device, a new type of 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 porous 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 porous intervertebral fusion cage of the present invention is:

[0006] The porous intervertebral fusion cage comprises a fusion frame and a porous structure, wherein the porous structure is filled and arranged in the fusion frame. The porous intervertebral fusion cage is a flat structure as a whole, and the cross section of the porous intervertebral fusion cage is an elliptical structure.

[0007] The porous intervertebral fusion device includes a top end surface and a bottom end surface on both sides along the height direction, an implantation front end and an implantation rear end on both sides along the length direction, and a front side surface and a dorsal side surface on both sides along the width direction. The implantation front end of the porous intervertebral fusion device is a tapered structure, and the implantation rear end of the porous intervertebral fusion device is provided with an instrument slot structure.

[0008] The porous intervertebral fusion cage is provided with a bone grafting chamber penetrating the top surface, the porous structure and the bottom surface. The side of the bone grafting chamber is connected to the porous structure. The fusion frames of the top surface and the bottom surface are provided with tooth structures.

[0009] Compared with the existing technology, the present invention has the following advantages and effects: the present invention has a reasonable structural design, and utilizes a porous structure to be filled and arranged in the fusion frame. The fusion frame can provide structural strength for the entire fusion device, ensure the stability of the intervertebral fusion device during implantation and use, and avoid damage and fracture. The porous structure can achieve efficient ingrowth and fusion of bone tissue. When the intervertebral fusion device is implanted and used, the surfaces of the two adjacent vertebrae of the intervertebral fusion device have a large area of ​​contact with the surface of the porous structure, which can effectively improve the bone ingrowth and fusion effect. The porous intervertebral fusion device has a flat structure as a whole, which can adapt to the intervertebral space with a specific morphological structure for implantation and use. The intervertebral fusion device with a flat structure is implanted through a small incision, reducing surgical trauma. When implanted, the flat design can avoid excessive expansion of the intervertebral space, reduce compression on the nerve roots, and reduce the risk of surgery-related nerve damage. At the same time, the flat structure intervertebral fusion device can better fill the intervertebral space, especially when the intervertebral space becomes irregular due to disease or injury. The flat fusion device can provide more fitting support. The cross-section of the porous intervertebral fusion device is an elliptical structure. The elliptical structure design can better match the shape of the intervertebral space. When implanted, the elliptical structure design can distribute pressure more evenly, avoid local high-pressure areas, and reduce damage to adjacent vertebral end plates. At the same time, the intervertebral fusion device can provide a larger contact area with the adjacent vertebral end plates, realizing the intervertebral fusion device. Stable support, the front end of the implantation of the porous intervertebral fusion device is a conical structure, the front end of the fusion device with a conical structure can facilitate the implantation of the fusion device into the intervertebral space, in the case of limited surgical access, the front end of the conical structure can more smoothly pass through the tissue and bone to achieve the implantation of the fusion device, and the conical structure can better match the vertebral body. During the implantation of the fusion device, the fusion device can be stably embedded in the intervertebral space using the conical structure, thereby increasing the stability of the implantation of the fusion device and reducing the risk of displacement of the fusion device after implantation. The implantation rear end of the porous intervertebral fusion device is provided with an instrument slot structure, which can be adapted to the clamp used for the implantation surgery. The intervertebral fusion device can be implanted under the clamping action of the clamp. The intervertebral fusion device is provided with a bone grafting chamber, which is used to fill the corresponding bone tissue material into the bone grafting chamber to help the human bone tissue to attach and grow, so that a stable bony connection is formed between adjacent vertebrae. The bone grafting chamber is connected to the porous structure, so that after the bone tissue material is filled in the bone grafting chamber, the bone tissue material can grow into and fuse with the porous 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 tooth-like structure is provided on the fusion frame on the top and bottom surfaces, so that when the intervertebral fusion device is implanted and used, it can effectively ensure that the 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.

[0010] Furthermore, the porous structure of the porous intervertebral fusion cage is a random lattice structure, the random lattice structure includes a plurality of random lattice units, and the structure of the random lattice unit includes a trabecular structure and a Thiessen polygon structure.

[0011] Furthermore, a side support portion is provided on the porous structure on the side of the bone grafting chamber, and the side support portion is two side support bars arranged in a cross X shape.

[0012] Furthermore, windows are provided on the front side and the back side along the width direction of the porous intervertebral fusion cage, and the windows are connected to the bone grafting chamber.

[0013] Furthermore, the porous intervertebral fusion cage is provided with two bone grafting chambers in sequence along the length direction, and windows are provided through the front side and the dorsal side of both sides of each bone grafting chamber.

[0014] Furthermore, support rings are provided on both sides of the viewing window of the porous intervertebral fusion cage, and a plurality of oblique support bars are connected to the outer sides of the support rings, and the plurality of oblique support bars form an X-shaped structure with the support rings as the center.

[0015] Furthermore, the bone grafting chamber of the porous intervertebral fusion device is provided with bone chamber frames along the top end surface and the bottom end surface respectively, and the bone chamber frames are provided with tooth-shaped structures.

[0016] Furthermore, external support bars are provided between the two sides of the bone bin frame and the fusion frame, and the external support bars are provided along the width direction of the porous intervertebral fusion cage.

[0017] Furthermore, the heights of the porous intervertebral fusion cage on both sides along the width direction are different, and the height of the dorsal side of the porous intervertebral fusion cage is greater than the height of the frontal side.

[0018] Furthermore, the top and bottom end surfaces of the porous intervertebral fusion cage are arcuate structures along the length direction, and the height of the middle portion of the porous intervertebral fusion cage is greater than the heights of the two sides of the porous intervertebral fusion cage.

[0019] Furthermore, the porous structure surfaces on both sides of the bone grafting chamber along the length direction of the porous intervertebral fusion cage are provided with a wavy structure.

[0020] Furthermore, the instrument slot structure of the porous intervertebral fusion device at the rear end of the implantation includes connecting slots, connecting slots are symmetrically arranged on both sides of the rear end of the implantation, and through holes are arranged between the connecting slots at the rear end of the implantation.

[0021] Furthermore, the porous intervertebral fusion cage is manufactured in one piece through 3D printing.

[0022] 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

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the main structure of a porous intervertebral fusion cage of the present invention.

[0025] Figure 2 The utility model is a schematic diagram of a top view of the structure of a porous intervertebral fusion cage.

[0026] Figure 3 It is a left-side structural schematic diagram of a porous intervertebral fusion cage of the present invention.

[0027] Figure 4 This is a right side structural schematic diagram of a porous intervertebral fusion cage of the present invention.

[0028] Figure 5 The utility model is a schematic diagram of the three-dimensional structure of a porous intervertebral fusion cage.

[0029] In the figure: 1. Fusion frame, 2. Porous structure, 3. Top surface, 4. Bottom surface, 5. Implant front end, 6. Implant back end, 7. Front side, 8. Dorsal side, 9. Instrument slot structure, 10. Bone graft chamber, 11. Side support part, 12. Window, 13. Support ring, 14. Oblique support bar, 15. Bone graft chamber frame, 16. Outer support bar, 17. Connecting slot, 18. Through hole. DETAILED DESCRIPTION

[0030] In order to further describe the present invention, a specific embodiment of a porous intervertebral fusion cage 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.

[0031] This embodiment provides a porous intervertebral fusion cage for implantation in the lumbar intervertebral fusion fixation. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The porous intervertebral fusion device includes a fusion frame 1 and a porous structure 2. The porous structure 2 is filled in the fusion frame 1. The fusion frame 1 can provide structural strength for the entire fusion device, ensure the stability of the intervertebral fusion device during implantation and use, and avoid damage and fracture. The porous structure 2 can achieve efficient ingrowth and fusion of bone tissue. When the intervertebral fusion device is implanted and used, the surfaces of two adjacent vertebrae of the intervertebral fusion device have a large area of ​​contact with the surface of the porous structure 2, which can effectively improve the bone ingrowth and fusion effect.

[0032] The porous intervertebral fusion device has a flat structure as a whole, and the cross-section of the porous intervertebral fusion device is an elliptical structure. The flat structure can adapt to the intervertebral space with a specific morphological structure for implantation. The flat intervertebral fusion device is implanted through a small incision to reduce surgical trauma. During implantation, the flat design can avoid excessive expansion of the intervertebral space, reduce compression on the nerve roots, and reduce the risk of surgery-related nerve damage. At the same time, the flat intervertebral fusion device can better fill the intervertebral space, especially when the intervertebral space becomes irregular due to disease or injury, the flat fusion device can provide a more fitting support. The cross-section of the porous intervertebral fusion device is an elliptical structure, and the elliptical structure design can better match the shape of the intervertebral space. During implantation, the elliptical structure design can distribute pressure more evenly, avoid local high-pressure areas, and reduce damage to adjacent vertebral end plates. At the same time, the intervertebral fusion device can provide a larger contact area with the adjacent vertebral end plates to achieve stable support for the intervertebral fusion device.

[0033] The porous intervertebral fusion device includes a top surface 3 and a bottom surface 4 on both sides along the height direction, an implantation front end 5 and an implantation rear end 6 on both ends along the length direction, and a front side 7 and a dorsal side 8 on both sides along the width direction. The implantation front end 5 of the porous intervertebral fusion device is a conical structure, and the implantation rear end 6 of the porous intervertebral fusion device is provided with an instrument groove structure 9. The front end of the fusion device with a conical structure can facilitate the implantation of the fusion device into the intervertebral space. In the case of limited surgical access, the front end of the conical structure can more smoothly pass through tissue and bone to achieve fusion device implantation. At the same time, the conical structure can better match the vertebral body. During the fusion device surgical implantation, the fusion device can use the conical structure to stably embed into the intervertebral space, increase the stability of the fusion device surgical implantation, and reduce the risk of displacement of the fusion device after implantation. The implantation rear end 6 of the porous intervertebral fusion device is provided with an instrument groove structure 9. The instrument groove structure 9 can be adapted to the clamp used for implantation surgery, and the intervertebral fusion device can be surgically implanted under the clamping action of the clamp.

[0034] The porous intervertebral fusion device is provided with a bone grafting bin 10 that passes through the top surface 3, the porous structure 2 and the bottom surface 4. The side of the bone grafting bin 10 is connected to the porous structure 2. The fusion frame 1 of the top surface 3 and the bottom surface 4 is provided with a tooth structure. The bone grafting bin 10 is used to fill with corresponding bone tissue materials to help the human bone tissue to grow and adhere, so that a stable bone connection is formed between adjacent vertebrae. The bone grafting bin 10 is connected to the porous structure 2, so that after the bone grafting bin 10 is filled with bone tissue materials, the bone tissue materials can grow into contact with the porous structure 2 corresponding to the inner hole wall of the bone grafting bin 10 over a large area, shorten the implantation and fusion time of the intervertebral fusion device, and improve the fusion efficiency. The tooth structure is provided on the fusion frame 1 of the top surface 3 and the bottom surface 4, so that when the intervertebral fusion device is implanted and used, it can effectively ensure that the 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.

[0035] In some embodiments, the porous structure 2 of the porous intervertebral fusion device is a random lattice structure. The random lattice structure can improve the bone ingrowth effect of the intervertebral fusion device, and the random lattice structure can make the elastic modulus of the intervertebral fusion device close to the elastic modulus of human bone, thereby avoiding stress shielding of the intervertebral fusion device during implantation and use.

[0036] The random lattice structure includes multiple 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. The connecting rod structures are connected end to end to form a polygon. The polygon includes but is not limited to a triangle, a quadrilateral, a pentagon, a hexagon, and a heptagon.

[0037] 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.

[0038] See Figure 5 In some embodiments, a side support portion 11 is provided on the porous structure 2 on the side of the bone grafting bin 10. The side support portion 11 is two side support bars arranged in a cross X shape. The overall structure of the side support portion 11 is reasonable and the structural strength is high. While effectively supporting the side of the bone grafting bin 10 of the intervertebral fusion device, the side support portion 11 occupies a small area on the side of the bone grafting bin 10. The large area of ​​the random lattice structure on the side of the bone grafting bin 10 can contact with human bone tissue and the filled bone tissue material when implanted, which is conducive to the ingrowth and fusion of bone tissue.

[0039] See Figure 1 and Figure 5 In some embodiments, windows 12 are provided on the front side 7 and the dorsal side 8 along the width direction of the porous intervertebral fusion device. The windows 12 are arranged in a continuous manner with the bone graft chamber 10. The windows 12 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 12, the operator can regularly monitor the progress of bone graft fusion and promptly discover any possible fusion obstacles or problems, so as to efficiently take corresponding treatment measures. During the fusion surgical implantation process, the windows 12 can be used as a reference point for implantation to assist the operator in more accurately positioning and implanting the fusion device. At the same time, using the windows 12 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 with the initial implantation position during use, which helps the operator to take corresponding measures. The present embodiment does not limit the shape of the window 12. The window 12 can be in the shape of a variety of through-holes 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.

[0040] See Figure 1 、 Figure 2 and Figure 5In some embodiments, the porous intervertebral fusion device is provided with two bone grafting bins 10 in sequence along the length direction, and each bone grafting bin 10 is provided with a through-window 12 on the front side 7 and the dorsal side 8 on both sides. By providing two bone grafting bins 10 in sequence, the cross-sectional area of ​​the bone grafting bin 10 can be effectively increased. Compared with providing a single bone grafting bin 10 on the intervertebral fusion device, when the cross-sectional area of ​​the single bone grafting bin 10 is equal to the sum of the cross-sectional areas of the aforementioned two bone grafting bins 10, the intervertebral fusion device provided with two bone grafting bins 10 has better overall structural strength and a more stable and firm structure. By providing two bone grafting bins 10 in sequence, the two bone grafting bins 1 0 can accommodate more bone graft material, which is conducive to creating a larger bone fusion bridge in the intervertebral space, thereby improving the success rate of bone fusion. At the same time, each bone graft bin 10 can be independently filled with bone graft material, which increases the surface area of ​​bone growth and fusion, promotes the bony connection between adjacent vertebrae, and accelerates the healing process. The double bone graft bin 10 design allows the operator to flexibly adjust the distribution of bone graft material according to the patient's specific anatomical structure and disease needs to achieve a personalized treatment plan. The two bone graft bins 10 can more evenly distribute the pressure on the vertebral endplate, avoiding bone damage or subsidence of the intervertebral fusion device caused by excessive local pressure.

[0041] See Figure 1 and Figure 5 In some embodiments, support rings 13 are provided on both sides of the window 12 of the porous intervertebral fusion device, and multiple oblique support bars 14 are connected to the outside of the support rings 13. The support rings 13 provide support strength for both ends of the window 12, and the oblique support bars 14 on the outside of the support rings 13 provide support strength for both ends of the window 12 and both sides of the entire fusion device, so as to prevent 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 12 are provided on both sides of the intervertebral fusion device, the overall stability and firmness of the fusion device can be guaranteed.

[0042] Multiple oblique support bars 14 form an X-shaped structure with the support ring 13 as the center. The X-shaped structure formed by the multiple oblique support bars 14 has a reasonable overall structure and high structural strength. While providing support strength to the two ends of the fusion device window 12 and the two sides of the entire fusion device, the multiple oblique support bars 14 occupy a small area. The random lattice structure on the side of the intervertebral fusion device bone grafting chamber 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.

[0043] See Figure 2 and Figure 5In some embodiments, the bone grafting chamber 10 of the porous intervertebral fusion device is provided with a bone grafting frame 15 along the top end surface 3 and the bottom end surface 4, respectively. The bone grafting frame 15 is provided with a tooth-like structure. The bone grafting frame 15 can improve the structural strength of the end surfaces on both sides of the bone grafting chamber 10. The tooth-like structure of the bone grafting frame 15 can improve the occlusal fixation force between the intervertebral fusion device and the two adjacent vertebrae when the intervertebral fusion device is implanted and used, so as to ensure that the fusion device is stably and firmly located between the two adjacent vertebrae, thereby avoiding the displacement and skew of the intervertebral fusion device during implantation and use.

[0044] In some embodiments, external support bars 16 are provided between the two sides of the bone bin frame 15 and the fusion frame 1. The external support bars 16 are provided along the width direction of the porous intervertebral fusion device. During the implantation and use of the intervertebral fusion device, the structural strength of the intervertebral fusion device itself is very important, which can ensure that the intervertebral fusion device does not rupture or deform when implanted between two vertebrae. The external support bars 16 of the intervertebral fusion device can ensure the structural stability of the intervertebral fusion device along the width direction, and avoid the intervertebral fusion device from being squeezed and deformed along the width direction during the implantation and use.

[0045] See Figure 3 and Figure 4 In some embodiments, the heights of the porous intervertebral fusion device on both sides along the width direction are different, and the height of the dorsal side surface 8 of the porous intervertebral fusion device is greater than the height of the frontal side surface 7, that is, the top surface 3 and the bottom surface 4 of the porous intervertebral fusion device form an angle. The angle formed by the top surface 3 and the bottom surface 4 of the intervertebral fusion device can better adapt to the spinal curvature and improve the fit between the intervertebral fusion device and the two adjacent vertebrae. The angle design of the top surface 3 and the bottom surface 4 of the fusion device can increase the contact area between the fusion device and the vertebral end plate, and achieve more uniform force on the top surface 3 and the bottom surface 4 of the intervertebral fusion device, thereby improving the installation stability of the intervertebral fusion device and effectively reducing the rotation or sliding of the fusion device in the intervertebral space.

[0046] The angle formed by the top surface 3 and the bottom surface 4 of the porous intervertebral fusion is 0-8 degrees. Intervertebral fusion devices with different angles can be selected according to the individual differences of the patients and the differences in different parts of the patient's spine. The adjustability of the angle between the top surface 3 and the bottom surface 4 increases the flexibility of the intervertebral fusion device implantation surgery.

[0047] See Figure 1In some embodiments, the top surface 3 and the bottom surface 4 of the porous intervertebral fusion device are cambered structures along the length direction. The height of the middle part of the porous intervertebral fusion device is greater than the height of the two sides of the porous intervertebral fusion device. The intervertebral fusion device can better match the end plates of the upper and lower vertebrae, thereby providing a more stable contact interface. The cambered surface structure design can increase the contact area between the fusion device and the vertebrae, help improve the stability of the fusion device, and reduce the movement of the fusion device in the intervertebral space. The cambered surface contact between the intervertebral fusion device with the vertebral end plates can more evenly disperse the pressure during implantation and reduce local high-pressure areas. At the same time, the cambered surface structure on the surface of the 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.

[0048] In some embodiments, the bone grafting chamber 10 is provided with a wavy structure on the surface of the porous structure 2 on both sides along the length direction of the porous intervertebral fusion device. The wavy structure on both sides of the top end surface 3 and the bottom end surface 4 of the intervertebral fusion device is intended to utilize the undulating structural surface to achieve stable fixation of the intervertebral fusion device between adjacent vertebrae, which can not only improve the implantation stability of the intervertebral fusion device and prevent offset shaking, but also improve the contact and fusion degree between the intervertebral fusion device and the adjacent vertebrae, thereby improving the fusion efficiency and quality of the intervertebral fusion device.

[0049] See Figure 1 and Figure 5 In some embodiments, the instrument slot structure 9 of the rear end 6 of the porous intervertebral fusion device includes a connecting slot 17. The connecting slots 17 are symmetrically arranged on both sides of the rear end 6 of the implantation. During the fusion device surgical implantation process, a variety of clamping tools can be used in combination with the connecting slots 17. The operator can use the clamping tool to stably clamp the intervertebral fusion device and then implant it into the adjacent lumbar intervertebral spaces of the patient, thereby improving the convenience of the operation and the accuracy of the fusion device implantation and installation. Through holes 18 are provided between the connecting slots 17 of the rear end 6 of the implantation. During the process of implanting the intervertebral fusion device using an oblique approach, when the position of the intervertebral fusion device needs to be adjusted or withdrawn backward, the fusion device implantation instrument can use the through holes 18 to pull and adjust the position of the intervertebral fusion device by hooking and pulling, which is convenient and efficient to operate.

[0050] In some embodiments, the porous intervertebral fusion cage is manufactured in one piece through 3D printing, and the product processing is efficient and the size is precise.

[0051] 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 porous intervertebral fusion cage, characterized by: The porous intervertebral fusion device comprises a fusion frame (1) and a porous structure (2), wherein the porous structure (2) is filled and arranged in the fusion frame (1); the porous intervertebral fusion device is a flat structure as a whole, and the cross section of the porous intervertebral fusion device is an elliptical structure; The porous intervertebral fusion device includes a top end surface (3) and a bottom end surface (4) on both sides along the height direction, an implantation front end (5) and an implantation rear end (6) on both sides along the length direction, and a front side surface (7) and a back side surface (8) on both sides along the width direction. The implantation front end (5) of the porous intervertebral fusion device is a conical structure, and the implantation rear end (6) of the porous intervertebral fusion device is provided with an instrument slot structure (9); The porous intervertebral fusion device is provided with a bone grafting chamber (10) penetrating the top end surface (3), the porous structure (2) and the bottom end surface (4); the side of the bone grafting chamber (10) is connected to the porous structure (2); and the fusion frame (1) of the top end surface (3) and the bottom end surface (4) is provided with a tooth-like structure.

2. The porous intervertebral fusion cage according to claim 1, characterized in that: The porous structure (2) of the porous intervertebral fusion device is a random lattice structure, which includes a plurality of random lattice units. The structure of the random lattice unit includes a trabecular structure and a Thiessen polygon structure.

3. The porous intervertebral fusion cage according to claim 2, characterized in that: A side support portion (11) is provided on the porous structure (2) on the side of the bone grafting chamber (10), and the side support portion (11) is two side support bars arranged in a cross X shape.

4. The porous intervertebral fusion cage according to claim 1 or 3, characterized in that: Windows (12) are provided on the front side (7) and the back side (8) along the width direction of the porous intervertebral fusion device, and the windows (12) are connected to the bone grafting chamber (10).

5. The porous intervertebral fusion cage according to claim 4, characterized in that: The porous intervertebral fusion device is provided with two bone grafting chambers (10) in sequence along the length direction, and windows (12) are provided on the front side (7) and the back side (8) on both sides of each bone grafting chamber (10).

6. The porous intervertebral fusion cage according to claim 4, characterized in that: Support rings (13) are provided on both sides of the window (12) of the porous intervertebral fusion device. A plurality of oblique support bars (14) are connected to the outside of the support rings (13). The plurality of oblique support bars (14) form an X-shaped structure with the support rings (13) as the center.

7. The porous intervertebral fusion cage according to claim 1 or 5, characterized in that: The bone grafting chamber (10) of the porous intervertebral fusion device is provided with bone chamber frames (15) along the top end surface (3) and the bottom end surface (4), respectively, and a tooth-shaped structure is provided on the bone chamber frame (15).

8. The porous intervertebral fusion cage according to claim 7, characterized in that: External support bars (16) are provided between the two sides of the bone bin frame (15) and the fusion frame (1), and the external support bars (16) are provided along the width direction of the porous intervertebral fusion cage.

9. The porous intervertebral fusion cage according to claim 1 or 8, characterized in that: The heights of the porous intervertebral fusion device on both sides along the width direction are different, and the height of the dorsal side (8) of the porous intervertebral fusion device is greater than the height of the front side (7).

10. The porous intervertebral fusion cage according to claim 9, characterized in that: The top end surface (3) and the bottom end surface (4) of the porous intervertebral fusion device are arcuate structures along the length direction, and the height of the middle part of the porous intervertebral fusion device is greater than the height of the two sides of the porous intervertebral fusion device.

11. The porous intervertebral fusion cage according to claim 1 or 10, characterized in that: The surface of the porous structure (2) on both sides of the bone grafting chamber (10) along the length direction of the porous intervertebral fusion device is provided with a wavy structure.

12. The porous intervertebral fusion cage according to claim 11, characterized in that: The instrument slot structure (9) of the porous intervertebral fusion device implanted at the rear end (6) includes connecting slots (17), the connecting slots (17) are symmetrically arranged on both sides of the implanted rear end (6), and a through hole (18) is arranged between the connecting slots (17) of the implanted rear end (6).

13. The porous intervertebral fusion cage according to claim 12, characterized in that: The porous intervertebral fusion cage is manufactured in one piece through 3D printing.

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