3D printing porous intervertebral fusion cage

Abstract

This invention relates to the field of interbody fusion device technology, specifically a 3D-printed porous interbody fusion device, comprising a fusion device body, a first filling hole penetrating through the middle of the fusion device body, and a plurality of internal reinforcing ribs evenly distributed circumferentially on the inner wall of the first filling hole. Based on the biomimetic mechanical design concept of the biomedical engineering industry, this interbody fusion device can break through the limitations of traditional fixed-width fusion devices, and can accurately match the anatomical width of the intervertebral space of different patients without the need for manual cutting and modification during surgery. It can fully adapt to the individualized needs of various heights, weights and disease segments, and fundamentally avoid the risks of endplate damage, infection and anchoring structure damage caused by cutting. After implantation, the self-locking component can achieve immediate rigid locking, completely blocking the reverse rebound path of the adjustment block. Combined with the multi-occlusal tooth structure, it forms a stable mechanical anchor, eliminating postoperative micromovement, displacement and slippage problems, and greatly improving the overall stability of the fusion device in the early stage of implantation.

Description

Technical Field

[0001] This invention relates to the field of interbody fusion device technology, specifically a 3D-printed porous interbody fusion device. Background Technology

[0002] With the accelerating aging of the population and the normalization of poor posture and sedentary work patterns, the incidence of degenerative diseases in the cervical and lumbar spine segments is rising year by year. Herniated discs, spinal stenosis, and spondylolisthesis have become common diseases in orthopedic clinics. These conditions often cause nerve root compression, lower back and leg pain, limb numbness, and even motor dysfunction, severely impacting patients' daily lives and work quality. Interbody fusion is currently the core surgical procedure for treating moderate to severe degenerative spinal diseases. By removing the diseased intervertebral disc and implanting an interbody fusion device, it restores the height of the intervertebral space, corrects the physiological curvature of the spine, and achieves bony fusion of the vertebral bodies, making it a key means of rebuilding long-term spinal stability.

[0003] Leveraging the rapid development opportunities brought by the interdisciplinary integration of biomedical engineering technologies and the innovation of high-end medical implants, additive manufacturing (3D printing) technology has been rapidly applied and is becoming increasingly mature in the field of orthopedic implants. Selective laser melting, electron beam melting, and other metal 3D printing processes are gradually being industrialized, providing core technological support for the structural innovation of interbody fusion devices. 3D-printed porous interbody fusion devices have emerged as a result. The core design intention of this type of product is to match the elastic modulus of human bone tissue through precise optimization design of controllable porous structures, eliminate stress shielding effects, and provide a three-dimensional biological scaffold for osteoblast adhesion, proliferation, and differentiation, thereby achieving directional ingrowth of bone tissue across pores and ultimately achieving the clinical goal of vertebral fusion. Currently, these products are mostly made of biocompatible materials such as medical titanium alloys and porous tantalum, and have been widely used in various intervertebral fusion surgeries such as anterior cervical spine fusion and posterior lumbar spine fusion. However, due to limitations in 3D printing process precision, structural design logic, material modification technology and post-processing technology, existing commercial products still have a number of systemic technical defects, which directly restrict the success rate of clinical fusion and the long-term prognosis of patients.

[0004] Currently, mainstream 3D-printed porous intervertebral fusion cages in clinical practice all adopt a standardized structure with a fixed width, failing to consider the individual differences in the anatomical width of the intervertebral space among different patients, becoming a core clinical pain point during surgery. Spinal surgery strictly prohibits cutting the vertebral endplates to prevent damage to the blood supply and cortical bone of the endplates, and to prevent disruption of the postoperative bone healing foundation. When the intervertebral space is excessively narrow and a standard-width fusion cage cannot be implanted, the surgeon can only temporarily cut the fusion cage manually during the operation to adapt the width. This procedure is cumbersome, significantly prolonging the operation time and increasing the risk of trauma; moreover, the precision of manual cutting is extremely poor, and it is very easy to directly cut off the toothed interlocking grooves on both sides of the fusion cage, causing the fusion cage to completely lose the mechanical anchoring effect between the grooves and the vertebral endplates, greatly reducing the attachment and initial stability of the fusion cage, and easily causing postoperative micromovement and displacement; at the same time, there are few product specifications and models, which cannot be adapted to patients of different heights, weights, and lesion segments, limiting the clinical selection space. Summary of the Invention

[0005] The purpose of this invention is to provide a 3D-printed porous interbody fusion cage to address the problems mentioned in the background art, which state that existing 3D-printed porous interbody fusion cages all adopt a fixed-width standardized structure, failing to take into account the individual differences in the anatomical width of the intervertebral space. Clinically, cutting the vertebral endplate is strictly prohibited. When the intervertebral space is narrow, the fusion cage can only be manually cut during surgery, which is cumbersome, time-consuming, and traumatic. It is also easy to damage the toothed groove, reduce the attachment stability, and cause postoperative micromovement and displacement. In addition, the product specifications are limited and cannot meet the needs of different patients and disease segments.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a 3D-printed porous interbody fusion device, comprising a fusion device body, a first filling hole penetrating through the middle of the fusion device body, and a plurality of inner reinforcing ribs evenly distributed circumferentially on the inner wall of the first filling hole. A plurality of outer reinforcing ribs are evenly fixed on the outer peripheral walls at both ends of the fusion device body. Adjustment blocks are provided on both sides of the fusion device body. Adaptive adjustment components are provided between the adjustment blocks and the fusion device body. A limiting block is fixedly installed in the middle of the side of the adjustment block near the fusion device body. A self-locking component is provided on the outside of the limiting block. The adaptive adjustment component includes a limiting compression groove and two limiting guide rods. The limiting compression groove is opened on the inner wall of the side of the fusion device body near the adjustment block. The two limiting guide rods are symmetrically fixedly installed at both ends of the adjustment block facing the fusion device body.

[0007] Furthermore, the adjusting block has two second filling holes symmetrically through it, and the fusion body has two third filling holes symmetrically through it between the first filling hole and the limiting compression groove.

[0008] Furthermore, the fusion device body has a guide hole on the side near each limiting guide rod. A limiting ring is fixedly installed inside the guide hole near the adjusting block. One end of the limiting guide rod passes through the middle of the limiting ring and extends into the guide hole.

[0009] Furthermore, a limiting piston block is fixedly installed at one end of the limiting guide rod that extends into the guide hole, and the limiting piston block and the guide hole are in a sliding sealing fit.

[0010] Furthermore, an abutment spring is provided inside the guide hole, and the two ends of the abutment spring are respectively fixedly installed on one side of the limiting piston block and the bottom wall of the guide hole. The outer peripheral wall of the adjusting block is formed with a number of meshing teeth at equal intervals.

[0011] Furthermore, the self-locking component includes two limiting mounting slots and two sets of several inclined toothed blocks. The two limiting mounting slots are symmetrically opened on the outer sides of the limiting blocks, and the several inclined toothed blocks in each set are fixedly installed at equal intervals inside the limiting mounting slots on the corresponding sides.

[0012] Furthermore, one end of the limiting block penetrates through the fusion body and extends into the first filling hole. A fixing block is fixedly installed at the end of the limiting block that extends into the first filling hole. A fourth filling hole is opened through the interior of the fixing block. Several interlocking limiting teeth are evenly spaced around the outside of the side of the fixing block away from the limiting block.

[0013] Furthermore, locking baffles are provided on both sides of the limiting block near the fixing block. The locking baffles are inserted into the outside of the corresponding inclined tooth block, and a support plate is fixedly installed on the end of the locking baffle away from the inclined tooth block.

[0014] Furthermore, a limiting mounting seat is fixedly installed at the end of the support plate away from the locking baffle. Each corner of the limiting mounting seat is provided with a threaded hole, and a positioning bolt is threaded into the threaded hole. One end of the positioning bolt is threaded into the corresponding threaded hole of the fusion body.

[0015] Furthermore, the limiting guide rod, the limiting piston block, and the adjusting block are coaxially connected and have an injection hole, and a medical implantable rubber ring is embedded and fixed at one end of the injection hole near the outer side of the adjusting block.

[0016] Compared with the prior art, the beneficial effects of the present invention are: By adapting to the settings of the adjustment components and relying on the biomimetic mechanical design concept of the biomedical engineering industry, this interbody fusion device can break through the limitations of traditional fixed-width fusion devices. It can accurately match the anatomical width of the intervertebral space of different patients without the need for manual cutting and modification during surgery. It can fully adapt to the individualized needs of patients of various heights and weights and various disease segments. It avoids the risks of endplate damage, postoperative infection and anchoring structure damage caused by manual cutting from the root. After implantation, the self-locking component can achieve immediate rigid locking, completely blocking the reverse rebound path of the adjustment block. Combined with the multi-occlusal tooth structure, it forms a stable mechanical anchor, eliminating postoperative micromovement, displacement and slippage problems, greatly improving the overall stability of the fusion device in the early stage of implantation, and effectively solving the core clinical pain points.

[0017] This interbody fusion device features a dual-optimized design with a fully permeable filling port and an internal fluid injection seal. The multi-porous structure ensures that the bone graft material is fully filled and encapsulated. Combined with the internal and external reinforcing ribs, it balances overall mechanical strength with space for bone tissue ingrowth, providing a three-dimensional scaffold for osteoblast adhesion and proliferation, significantly improving the success rate of vertebral bony fusion and enhancing long-term patient prognosis. It also includes a coaxial fluid injection port and a medical implantable rubber ring, allowing for the injection of sterile lubricating medium before surgery. During surgery, the fluid is automatically drained by the squeezing force, forming a protective membrane for the endplate, achieving low-resistance, non-invasive implantation. This further simplifies the surgical procedure, shortens the operation time, reduces intraoperative trauma, and strengthens the product's minimally invasive clinical advantages. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the fusion device body and the limiting block of the present invention; Figure 3 This is a schematic diagram of the overall and partial cross-sectional three-dimensional structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B; Figure 6 This is a three-dimensional structural diagram of the fusion device body and the limiting compression groove of the present invention; Figure 7 This is a schematic diagram demonstrating the installation of the fusion device body and the spinal segment of the present invention; Figure 8 This is a three-dimensional structural diagram of the limiting block and fixing block of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C; Figure 10This is a partial cross-sectional three-dimensional structural diagram of the limiting guide rod and the injection hole of the present invention.

[0019] In the attached diagram, the components represented by each number are as follows: 1. Fusion device body; 2. First filling hole; 3. Inner reinforcing rib; 4. Outer reinforcing rib; 5. Limiting compression groove; 6. Adjusting block; 7. Second filling hole; 8. Third filling hole; 9. Guide hole; 10. Limiting retaining ring; 11. Limiting guide rod; 12. Limiting piston block; 13. Contact spring; 14. Limiting block; 15. Fixing block; 16. Fourth filling hole; 17. Engaging limiting tooth; 18. Limiting mounting groove; 19. Inclined tooth block; 20. Limiting mounting seat; 21. Positioning bolt; 22. Support plate; 23. Locking baffle; 24. Injection hole; 25. Medical implantable rubber ring; 26. Engaging tooth. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 1 - Figure 9 A 3D-printed porous interbody fusion device includes a fusion device body 1, a first filling hole 2 penetrating through the middle of the fusion device body 1, and a plurality of inner reinforcing ribs 3 evenly distributed circumferentially on the inner wall of the first filling hole 2. A plurality of outer reinforcing ribs 4 are evenly fixed on the outer peripheral walls at both ends of the fusion device body 1. Adjustment blocks 6 are provided on both sides of the fusion device body 1. Adaptive adjustment components are provided between the adjustment blocks 6 and the fusion device body 1. A limiting block 14 is fixedly installed in the middle of the side of the adjustment block 6 near the fusion device body 1. A self-locking component is provided on the outside of the limiting block 14. The adaptive adjustment component includes a limiting compression groove 5 and two limiting guide rods 11. The limiting compression groove 5 is opened on the inner wall of the side of the fusion device body 1 near the adjustment block 6. The two limiting guide rods 11 are symmetrically fixed at both ends of the adjustment block 6 facing the fusion device body 1.

[0022] The adjusting block 6 has two second filling holes 7 symmetrically through it, and the fusion body 1 has two third filling holes 8 symmetrically through it between the first filling hole 2 and the limiting compression groove 5.

[0023] The fusion body 1 has a guide hole 9 on the side near each limit guide rod 11. A limit ring 10 is fixedly installed inside the guide hole 9 near the adjustment block 6. One end of the limit guide rod 11 passes through the middle of the limit ring 10 and extends into the guide hole 9.

[0024] A limiting piston block 12 is fixedly installed at one end of the limiting guide rod 11 that extends into the guide hole 9, and the limiting piston block 12 and the guide hole 9 are in a sliding sealing fit.

[0025] The guide hole 9 is equipped with a retaining spring 13. The two ends of the retaining spring 13 are fixedly installed on one side of the limiting piston block 12 and the bottom wall of the guide hole 9, respectively. The outer peripheral wall of the adjusting block 6 is formed with a number of meshing teeth 26 at equal intervals.

[0026] The self-locking component includes two limiting mounting slots 18 and two sets of several inclined toothed blocks 19. The two limiting mounting slots 18 are symmetrically opened on the outer sides of the limiting block 14, and the several inclined toothed blocks 19 in each set are fixedly installed at equal intervals inside the limiting mounting slots 18 on the corresponding sides.

[0027] One end of the limiting block 14 penetrates through the fusion body 1 and extends into the first filling hole 2. A fixing block 15 is fixedly installed at the end of the limiting block 14 that extends into the first filling hole 2. A fourth filling hole 16 is opened through the inside of the fixing block 15. Several biting limiting teeth 17 are arranged at equal intervals around the outside of the side of the fixing block 15 away from the limiting block 14.

[0028] Locking baffles 23 are provided on both sides of the limiting block 14 near the fixed block 15. The locking baffles 23 are inserted into the outside of the corresponding inclined tooth block 19. A support plate 22 is fixedly installed on the end of the locking baffle 23 away from the inclined tooth block 19.

[0029] A limit mounting base 20 is fixedly installed at the end of the support plate 22 away from the locking baffle 23. The limit mounting base 20 is provided with threaded holes at the corners. A positioning bolt 21 is threadedly connected to the threaded hole. One end of the positioning bolt 21 is threadedly connected to the corresponding threaded hole in the fusion body 1.

[0030] In this embodiment, relying on the biomimetic mechanical design of the biomedical engineering industry and the clinical standards of minimally invasive spinal surgery, the overall workflow fully conforms to the practical operation specifications of intervertebral fusion surgery. Before the operation, the width, height and anatomical shape of the patient's diseased intervertebral space are accurately measured by medical imaging equipment to complete the surgical plan. At the same time, the fusion device is pre-treated aseptically to ensure that the implantation process meets the requirements of medical aseptic operation.

[0031] During the procedure, the affected spinal segment is routinely exposed, the diseased intervertebral disc tissue is completely removed, and the nucleus pulposus residue, hyperplastic bone, and hyperplastic soft tissue within the intervertebral space are thoroughly cleaned. Throughout the procedure, the integrity of the vertebral endplate is strictly preserved to avoid damage to the blood supply and cortical bone of the endplate, thus laying a solid foundation for postoperative bone healing. After cleaning, the fusion device is smoothly implanted into the target intervertebral space. The implantation process does not require any manual cutting, grinding, or modification of the fusion device, and it can be adapted to the individualized intervertebral space size of different patients.

[0032] After the fusion cage is implanted into the intervertebral space, it is immediately subjected to radial compression force from the endplates of the superior and inferior vertebral bodies. The adjusting blocks 6 on both sides contract synchronously towards the fusion cage body 1 under the compression force, causing the symmetrically arranged limiting guide rods 11 at both ends to slide smoothly inward along the corresponding guide holes 9. The limiting retaining rings 10 precisely limit the sliding stroke of the limiting guide rods 11 to prevent excessive displacement from causing component slippage or structural jamming. The limiting piston block 12 at the end of the limiting guide rod 11 slides together, continuously compressing the contact spring 13 inside the guide hole 9, causing it to produce controllable elastic compression deformation. Through the elastic buffering and contraction adjustment of the contact spring 13, the overall width of the fusion cage is adaptively matched, perfectly fitting the actual size of the patient's intervertebral space. This completely avoids a series of clinical pain points caused by cutting the fusion cage during surgery, such as cumbersome operation, excessive time consumption, damage to the anchoring structure, and debris infection. Meanwhile, the inner reinforcing ribs 3 inside the fusion unit body 1 and the outer reinforcing ribs 4 on the outer periphery form a double mechanical reinforcement structure, ensuring the overall structural stability of the fusion unit during the shrinkage adjustment process, without the risk of bending or deformation. As the adjusting block 6 retracts inward, the centrally fixed limiting block 14 is simultaneously subjected to force and moves towards the first filling hole 2 in the middle of the fusion body 1. The inclined toothed blocks 19 in the limiting mounting grooves 18 on both sides of the limiting block 14 move synchronously with the limiting block 14. The unidirectional inclined end face of the inclined toothed block 19 continuously abuts against the corresponding locking baffle 23. The locking baffle 23 is firmly connected to the limiting mounting seat 20 through the support plate 22. The positioning bolt 21 firmly fixes the limiting mounting seat 20 to the side wall of the fusion body 1, ensuring that the locking structure has no displacement or loosening. The inclined toothed block 19 and the locking baffle 23 cooperate to form a unidirectional self-locking structure, which only allows the adjusting block 6 to retract inward to adapt to the intervertebral space, completely blocking the reverse rebound path of the adjusting block 6, realizing immediate rigid limiting after implantation, and eliminating the problems of micro-movement, displacement, and slippage of the fusion device from the root. The occlusal teeth 26 on the outer periphery of the adjusting block 6 simultaneously and tightly fit the vertebral endplate, forming a preliminary mechanical anchor, which greatly improves the initial stability after the fusion device is implanted.

[0033] After the adaptive adjustment and unidirectional self-locking process is completed, autologous or allogeneic bone graft material is filled into the first filling hole 2 of the fusion device, the second filling hole 7 inside the adjustment block 6, the third filling hole 8 inside the fusion device body 1, and the fourth filling hole 16 inside the fixation block 15. The bone graft material is fully filled through the full-area through-hole filling, and fully wraps the fusion device body 1, adjustment block 6 and limiting block 14. Together with the occlusal limiting teeth 17 on the outside of the fixation block 15, a multi-dimensional anchoring structure is formed, which effectively prevents the leakage and displacement of bone graft material, ensures sufficient bone volume in the bone graft area, provides a three-dimensional scaffold for osteoblast adhesion and proliferation, and accelerates the process of vertebral bony fusion.

[0034] Based on the structural optimization and innovation of the biomedical engineering industry, the fusion device in this embodiment achieves three core technical effects: individualized self-adaptation, immediate self-locking upon implantation, and full-area bone grafting fixation. It requires no additional instruments or intraoperative modifications, which simplifies the surgical procedure and shortens the operation time. At the same time, it enhances the anchoring stability of the fusion device, improves the efficiency of bone integration, solves the clinical defects of existing fixed-width fusion devices, and effectively improves the success rate of interbody fusion surgery and the long-term prognosis of patients.

[0035] Example 2: Please refer to Figure 1 , Figure 3 and Figure 10 This embodiment further illustrates Example 1. The limiting guide rod 11, the limiting piston block 12, and the adjusting block 6 are coaxially connected and have an injection hole 24. A medical implant rubber ring 25 is embedded and fixed at one end of the injection hole 24 near the outer side of the adjusting block 6.

[0036] In this embodiment, Embodiment 2 retains all the core functions of adaptive width adjustment, unidirectional self-locking, and bone graft fusion of Embodiment 1, and adds a coaxial fluid infusion guide structure to further optimize the minimally invasive implantation experience. Based on the design standards of minimally invasive implantable devices in the biomedical engineering industry, a sterile fluid infusion operation must be completed before the operation. The surgeon takes a sterile medical syringe, draws out clinically compliant medical sterile lubricating gel, and accurately inserts the syringe needle into the middle of the medical implant rubber ring 25. Using the syringe thrust, the lubricating gel is injected into the fluid infusion hole 24 at a uniform speed. After the fluid infusion is completed, the needle is pulled out. The medical implant rubber ring 25 automatically closes the needle hole due to its own elasticity, realizing the complete sealing of the fluid infusion hole 24, preventing premature leakage of gel, and ensuring that the fluid infusion operation is sterile and compliant throughout. This sealing design does not require additional sealing components, simplifies the preoperative preparation process, and adapts to the fast-paced operation requirements of the minimally invasive operating room.

[0037] The procedure for implanting the fusion cage into the intervertebral space during the operation is exactly the same as in Example 1. After the fusion cage is subjected to radial compression force from the vertebral endplate, the two adjusting blocks 6 on both sides simultaneously retract towards the fusion cage body 1, driving the limiting guide rod 11 and the limiting piston block 12 to slide inward and compress the contact spring 13, thereby achieving adaptive width adjustment. During this retraction process, the lubricating gel inside the injection hole 24 is simultaneously subjected to compression force, breaking through the sealing pre-tightening force of the medical implant rubber ring 25, and is slowly and evenly discharged from the outside of the adjusting block 6. The discharged lubricating gel immediately adheres to the outer periphery of the adjusting block 6. The contact interface with the vertebral endplate forms an ultra-thin lubricating protective film, which significantly reduces the hard frictional resistance between the fusion device and the vertebral endplate during implantation, preventing the occlusal teeth 26 from scratching the fragile vertebral endplate. It protects the blood supply and integrity of the endplate throughout the process, further avoiding the risk of delayed bone healing caused by endplate damage. After drainage, the lubricating gel quickly soaks into the tiny gaps in the intervertebral space. When filling with bone graft material later, it can help the bone graft material to fit tightly with the various structures of the fusion device and the vertebral endplate, further improving the bone graft fixation effect and accelerating osteoblast adhesion and proliferation.

[0038] This embodiment achieves an integrated function of preoperative sterile injection and intraoperative automatic drainage by combining a new coaxial injection hole 24 with a medical implantable rubber ring 25. It does not require additional operating steps and does not change the original surgical procedure. It retains all the core beneficial effects of Embodiment 1 and adds the additional advantages of non-invasive endplate protection and low-resistance minimally invasive implantation, further enhancing the product's minimally invasive attributes. It aligns with the innovative development direction of high-end implantable devices in the biomedical engineering industry and is more suitable for the special surgical needs of various osteoporosis patients and patients with intervertebral space stenosis.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 3D-printed porous interbody fusion device, comprising a fusion device body (1), a first filling hole (2) penetrating through the middle of the fusion device body (1), and a plurality of internal reinforcing ribs (3) uniformly distributed circumferentially on the inner wall of the first filling hole (2), characterized in that: Several reinforcing ribs (4) are evenly fixed on the outer peripheral walls at both ends of the fusion body (1). Adjustment blocks (6) are provided on both sides of the fusion body (1). An adaptation adjustment component is provided between the adjustment block (6) and the fusion body (1). A limit block (14) is fixedly installed in the middle of the side of the adjustment block (6) close to the fusion body (1). A self-locking component is provided on the outside of the limit block (14). The adaptive adjustment assembly includes a limiting compression groove (5) and two limiting guide rods (11). The limiting compression groove (5) is opened on the inner wall of the fusion body (1) near the adjustment block (6). The two limiting guide rods (11) are symmetrically fixed at both ends of the adjustment block (6) facing the fusion body (1).

2. The 3D-printed porous interbody fusion device according to claim 1, characterized in that: The adjusting block (6) has two second filling holes (7) symmetrically through it, and the fusion body (1) has two third filling holes (8) symmetrically through it between the first filling hole (2) and the limiting compression groove (5).

3. The 3D-printed porous interbody fusion device according to claim 1, characterized in that: The fusion body (1) has a guide hole (9) on the side near each limiting guide rod (11). A limiting ring (10) is fixedly installed inside the end of the guide hole (9) near the adjusting block (6). One end of the limiting guide rod (11) passes through the middle of the limiting ring (10) and extends into the interior of the guide hole (9).

4. The 3D-printed porous interbody fusion device according to claim 3, characterized in that: The limiting guide rod (11) extends into the guide hole (9) and a limiting piston block (12) is fixedly installed at one end. The limiting piston block (12) and the guide hole (9) are in a sliding sealing fit.

5. A 3D-printed porous interbody fusion device according to claim 4, characterized in that: The guide hole (9) is provided with a resisting spring (13). The two ends of the resisting spring (13) are respectively fixedly installed on one side of the limiting piston block (12) and the bottom wall of the guide hole (9). The outer peripheral wall of the adjusting block (6) is formed with a number of meshing teeth (26) at equal intervals.

6. The 3D-printed porous interbody fusion device according to claim 1, characterized in that: The self-locking component includes two limiting mounting slots (18) and two sets of several inclined tooth blocks (19). The two limiting mounting slots (18) are symmetrically opened on both sides of the limiting block (14), and each set of several inclined tooth blocks (19) is fixedly installed at equal intervals inside the limiting mounting slots (18) on the corresponding side.

7. A 3D-printed porous interbody fusion device according to claim 6, characterized in that: One end of the limiting block (14) penetrates through the fusion body (1) and extends into the first filling hole (2). A fixing block (15) is fixedly installed at the end of the limiting block (14) that extends into the first filling hole (2). A fourth filling hole (16) is opened through the interior of the fixing block (15). Several biting limiting teeth (17) are evenly spaced around the side of the fixing block (15) away from the limiting block (14).

8. A 3D-printed porous interbody fusion device according to claim 7, characterized in that: The limiting block (14) is provided with locking baffles (23) on both sides of the fixed block (15). The locking baffles (23) are inserted into the outside of the corresponding inclined tooth block (19). A support plate (22) is fixedly installed at the end of the locking baffle (23) away from the inclined tooth block (19).

9. A 3D-printed porous interbody fusion device according to claim 8, characterized in that: The support plate (22) is fixedly installed with a limiting mounting seat (20) at one end away from the locking baffle (23). The limiting mounting seat (20) has threaded holes at each corner, and a positioning bolt (21) is threaded into the threaded hole. One end of the positioning bolt (21) is threaded into the corresponding threaded hole of the fusion body (1).

10. A 3D-printed porous interbody fusion device according to claim 4, characterized in that: The limiting guide rod (11), the limiting piston block (12) and the adjusting block (6) are coaxially connected and have an injection hole (24). A medical implant rubber ring (25) is embedded and fixed at one end of the injection hole (24) near the outside of the adjusting block (6).

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