Anterior cervical interbody fusion cage

Abstract

The invention belongs to the technical field of medical implant prostheses, and particularly relates to an anterior cervical interbody fusion cage which comprises a fixing plate and a fusion cage body, the fixing plate is mounted on the fusion cage body, an area defined by the fusion cage body and the fixing plate is a bone grafting cavity, and screws are mounted on the fixing plate; a fusion through groove is formed in the fusion device main body, and a shaping blocking net is mounted at an opening of the fusion through groove; an injection hole is formed in the fixed plate, an adjusting rod is mounted in the injection hole, a movable plate is mounted on the adjusting rod, the movable plate is located in the bone grafting cavity, a fixed block is mounted in the injection hole, the fixed block is rotationally connected with the adjusting rod, and the adjusting rod is connected with the movable plate through threads; the fusion cage is simple in structure, the contact area and the contact effect of the vertebral body edge and the fusion cage can be increased, increase of the size of the fusion cage is avoided, implantation of the fusion cage in a cervical vertebra operation is facilitated, and the fusion effect and the fusion speed are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical implant prostheses, and specifically relates to an anterior cervical interbody fusion cage. Background Art

[0002] Anterior cervical interbody fusion cages are orthopedic implants for treating diseases such as spondylotic myelopathy, nerve root type cervical spondylosis, cervical disc herniation, and spinal stenosis. Doctors first make a transverse incision on the right side of the front of the neck, fully expose the anterior edge of the cervical vertebrae, locate the intervertebral space of the damaged cervical vertebra under fluoroscopy, clean the damaged part of the cervical vertebra body, remove the intervertebral disc at the damaged part of the cervical vertebra, insert a retractor into the cervical intervertebral space, grind a bone surface on the end plate that matches the fusion cage, remove the corresponding intervertebral disc, and remove the posterior longitudinal ligament if necessary. Use a curette to clean the bone graft bed, and after thorough decompression, implant a fusion cage of the appropriate size.

[0003] In practice, through the postoperative observation of a large number of cervical fusion surgeries, it is found that in some patients, fusion occurs on the side of the vertebral body (the part without bone graft outside the fusion cage) in the short term, while the bone graft part inside the fusion cage has not yet fused. This proves that the edge position of the cervical vertebra body is easier to fuse than the central position. At the same time, due to the relatively small incision of minimally invasive cervical surgery, it is difficult to implant a relatively large interbody fusion cage or a fusion cage with baffles directly added around it. At the same time, the contact effect between the side of the implanted interbody fusion cage and the edge of the vertebral body is not good, which is likely to affect the intervertebral disc fusion effect and fusion speed. Summary of the Invention

[0004] In order to make up for the deficiencies of the existing technology, increase the contact area and contact effect between the vertebral body edge and the fusion cage, avoid increasing the size of the fusion cage, facilitate the implantation of the fusion cage in cervical surgery, and improve the fusion effect and fusion speed, the present invention proposes an anterior cervical interbody fusion cage.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: An anterior cervical interbody fusion cage of the present invention includes a fixing plate and a fusion cage body. The fixing plate is installed on the fusion cage body. The area enclosed between the fusion cage body and the fixing plate is a bone graft cavity. The fixing plate is provided with screw holes, and screws are installed in the screw holes. The surface of the fusion cage body is evenly provided with protruding teeth; The fusion cage body is provided with a fusion through groove, and the fusion through groove communicates the bone graft cavity with the space outside the fusion body. A shaping retaining net is installed at the opening of the fusion through groove; The fixing plate is provided with an injection hole, an adjusting rod is installed in the injection hole, a movable plate is installed on the adjusting rod, the movable plate is located in the bone graft cavity, a fixing block is installed in the injection hole, the fixing block is rotatably connected to the adjusting rod, and the adjusting rod is threadedly connected to the movable plate.

[0006] Preferably, an installation groove is formed on the outer side surface of the main body of the fusion device, and an elastic baffle is installed in the installation groove, and the elastic baffle shields and closes the opening of the fusion through groove; The shaping retaining net is installed between the elastic baffle and the side wall at the opening of the fusion through groove.

[0007] Preferably, the fusion through groove includes a plurality of groups of unit grooves, and the cross section of the unit groove is rectangular.

[0008] Preferably, one end of the elastic baffle is fixedly installed at one end of the main body of the fusion device away from the fixing plate, and the opening direction of the elastic baffle when being squeezed and pushed open faces the fixing plate.

[0009] Preferably, a placement groove is formed on the elastic baffle, and elastic teeth are installed in the placement groove, and the elastic teeth are inclined relative to the bottom surface of the placement groove after popping out of the placement groove.

[0010] Preferably, the inclination direction of the elastic teeth faces away from the fixing plate, and the tooth tips at the end of the elastic teeth away from the placement groove are inclined towards the direction of the main body of the fusion device.

[0011] Preferably, sliding grooves are formed on the inner wall of the bone graft cavity, and protrusions are arranged at both ends of the movable plate, and the protrusions are slidably installed in the sliding grooves.

[0012] Preferably, the shaping retaining net is made of a biodegradable material, and a developing wire is arranged in the shaping retaining net, and the strength of the developing wire is greater than the strength of the shaping retaining net.

[0013] The beneficial effects of the present invention are as follows: 1. For the anterior cervical interbody fusion device of the present invention, by providing a fusion through groove, an adjusting rod, a movable plate, and a shaping retaining net, after the interbody fusion device is implanted into the intervertebral disc, the adjusting rod drives the movable plate to move, and the filling bone material in the bone graft cavity is squeezed from the fusion through groove into the shaping retaining net, so that the shaping retaining net is propped up and expanded, thereby increasing the size of the interbody fusion device in the intervertebral disc, as well as increasing the contact area and contact effect between the shaping retaining net and the extruded filling bone material and the vertebral body edge, thereby promoting the lateral fusion of the vertebral body of the intervertebral disc and improving the fusion effect and fusion speed after the implantation of the interbody fusion device.

[0014] 2. For the anterior cervical interbody fusion device of the present invention, by providing an elastic baffle, a prevention groove, and elastic teeth, the shaping retaining net is restricted before implantation, avoiding the deformed and protruding shaping retaining net from affecting the implantation of the interbody fusion device. At the same time, the friction between the elastic baffle and the intervertebral disc is increased through the elastic teeth, and the position of the elastic baffle in the intervertebral disc is unidirectionally limited and fixed, avoiding the displacement of the elastic baffle affected by the movement of the patient after the implantation of the interbody fusion device, which affects the fusion effect and fusion speed of the intervertebral disc. Brief Description of the Drawings

[0015] The present invention will be further described below in conjunction with the drawings.

[0016] Figure 1 is a perspective view of the intervertebral fusion device of the present invention; Figure 2 is a schematic structural view of the fixing plate in the intervertebral fusion device of the present invention; Figure 3 is a schematic structural view of the fusion device main body in the intervertebral fusion device of the present invention; Figure 4 is a schematic structural view of the intervertebral fusion device after implantation; wherein, the shaping retaining net is not marked; Figure 5 is a schematic installation view of the shaping retaining net and the fusion device main body in the intervertebral fusion device of the present invention; Figure 6 is a partial cross-sectional view of the shaping retaining net and the fusion device main body in the intervertebral fusion device of the present invention; In the figure: fixing plate 1, screw hole 11, screw 12, connecting arm 13, injection hole 14, fixing block 141, bone grafting cavity 15, fusion device main body 2, protruding teeth 21, fixing groove 22, fusion through groove 23, elastic baffle 24, placement groove 241, elastic teeth 242, installation groove 25, adjusting rod 3, movable plate 31, sliding groove 32, shaping retaining net 4. Detailed Description of the Invention

[0017] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0018] As Figures 1 to 6 shown, an anterior cervical intervertebral fusion device of the present invention includes a fixing plate 1 and a fusion device main body 2. The fixing plate 1 is installed on the fusion device main body 2. The area enclosed between the fusion device main body 2 and the fixing plate 1 is a bone grafting cavity 15. A screw hole 11 is opened on the fixing plate 1, and a screw 12 is installed in the screw hole 11. Protruding teeth 21 are uniformly arranged on the surface of the fusion device main body 2; A fusion through groove 23 is opened on the fusion device main body 2. The fusion through groove 23 communicates the bone grafting cavity 15 with the space outside the fusion main body. A shaping retaining net 4 is installed at the opening of the fusion through groove 23; An injection hole 14 is opened on the fixing plate 1. An adjusting rod 3 is installed in the injection hole 14. A movable plate 31 is installed on the adjusting rod 3. The movable plate 31 is located in the bone grafting cavity 15. A fixing block 141 is installed in the injection hole 14. The fixing block 141 is rotatably connected to the adjusting rod 3, and the adjusting rod 3 is threadedly connected to the movable plate 31; Among them, symmetrically distributed connecting arms 13 are provided on the fixing plate 1, and clamping blocks are provided on the connecting arms 13. When the fixing plate 1 is installed on the fusion device main body 2, the clamping blocks on the connecting arms 13 are inserted into the fixing grooves 22 on the fusion device main body 2. At the same time, the fusion device main body 2 is U-shaped, and the space enclosed between the fixing plate 1 and the fusion device main body 2 is a bone grafting cavity 15 for placing filling bone materials; At the same time, the intervertebral fusion device is fixed between the intervertebral discs by screws 12 installed in the screw holes 11, and the protruding teeth 21 on the surface of the fusion device main body 2 will increase the friction force of the intervertebral fusion device in the intervertebral disc, improving the installation effect of the intervertebral fusion device; Before the intervertebral fusion device is implanted into the intervertebral disc, the staff places the filling bone materials into the bone grafting cavity 15. At the same time, since a fusion through groove 23 is provided on the fusion device main body 2, when placing the filling bone materials, the fusion through groove 23 will be filled with the filling bone materials together. After that, after the intervertebral fusion device is installed into the intervertebral disc, the staff rotates the adjusting rod 3 in the injection hole 14 through a tool, so that the movable plate 31 in the bone grafting cavity 15 moves in a direction away from the fixing plate 1 under the action of the adjusting rod 3, exerting an extrusion and pushing effect on the filling bone materials in the bone grafting cavity 15; At the same time, after the intervertebral fusion device is implanted into the intervertebral disc, the upper and lower parts of the intervertebral fusion device will closely adhere to the end plates in the intervertebral disc, that is, the openings in the upper and lower directions of the bone grafting cavity 15 will be closed by the end plates in the intervertebral disc. Therefore, when the movable plate 31 moves to extrude and push the filling bone materials in the bone grafting cavity 15, the filling bone materials will not be extruded from the upper or lower part of the bone grafting cavity 15. And because the filling bone materials in the bone grafting cavity 15 are extruded and pushed, the corresponding positions of the bone grafting cavity 15 in the intervertebral disc will be in full contact with the filling bone materials, which is beneficial to subsequent bone creeping growth, improving the fusion speed and fusion effect; At the same time, after the filling bone materials in the bone grafting cavity 15 are pushed and extruded by the movable plate 31, the filling bone materials will be extruded from the fusion through groove 23 and then enter the shaping retaining net 4, making the shaping retaining net 4 gradually be propped up and expanded by the filling materials entering its interior. At the same time, after the shaping retaining net 4 is propped up and expanded, it will effectively increase and occupy the area of the intervertebral fusion device in the transverse direction in the intervertebral disc, that is, increase the bone grafting area in the intervertebral disc, thereby increasing the area of the vertebral body edge position in the intervertebral disc in contact with the filling bone materials, promoting the fusion at the edge position of the intervertebral disc, and further improving the fusion effect and fusion speed of the intervertebral fusion device. At the same time, after the shaping retaining net 4 is propped up by the filling bone materials inside, the shaping retaining net 4 will fully adhere to the surface of the intervertebral disc, making the filling bone materials in the shaping retaining net 4 fully contact with the intervertebral disc, facilitating subsequent bone creeping growth and improving the intervertebral disc fusion effect; Meanwhile, in the initial state, the shaping retaining net 4 can be folded and attached to the side of the fusion device main body 2, avoiding increasing the width of the fusion device main body 2, making the size of the intervertebral fusion device relatively small, facilitating the implantation of the intervertebral fusion device through a minimally invasive incision in cervical spine surgery, and reducing the implantation difficulty of the intervertebral fusion device; Meanwhile, the shaping retaining net 4 limits and positions the filling aggregate extruded at the fusion through groove 23, preventing the extruded filling aggregate from dispersing in the intervertebral disc and affecting the patient's health. At the same time, the design of the size and shape of the shaping retaining net 4 can also shape the shape of the extruded filling bone material in the intervertebral disc, ensuring sufficient contact between the extruded filling bone material and the side of the intervertebral fusion device and the area near the vertebral body edge, improving the intervertebral disc fusion effect and fusion speed; Meanwhile, after the adjusting rod 3 drives the movable plate 31 to move, the filling bone material in the bone grafting cavity 15 is squeezed into the shaping retaining net 4, and the filling bone material in the area of the bone grafting cavity 15 close to the fixing plate 1 is relatively less or lacking. At this time, since the fixing block 141 is installed in the injection hole 14 and the fixing block 141 is rotatably connected to the adjusting rod 3, there will be a gap between the injection hole 14 and the adjusting rod 3, so that the staff can inject additional filling bone material into the bone grafting cavity 15 from the injection hole 14, increasing the filling amount of the filling bone material, ensuring that the filling bone material in the bone grafting cavity 15 is sufficient and the filling bone material is in full contact with the intervertebral disc, thereby avoiding the lack or scarcity of the filling bone material in the bone grafting cavity 15, which affects the fusion effect and fusion speed of the intervertebral fusion device in the intervertebral disc.

[0019] As an embodiment of the present invention, an installation groove 25 is formed on the outer side surface of the fusion device main body 2, and an elastic baffle 24 is installed in the installation groove 25, and the elastic baffle 24 blocks and closes the opening of the fusion through groove 23; The shaping retaining net 4 is installed between the elastic baffle 24 and the side wall at the opening of the fusion through groove 23; By installing the elastic baffle 24 on the side of the fusion device main body 2, the elastic baffle 24 presses and restricts the shaping retaining net 4, thereby preventing the shaping retaining net 4 from deforming, dispersing and protruding randomly on the fusion device main body 2, which affects the implantation of the intervertebral fusion device; Meanwhile, since the shaping retaining net 4 is soft and easy to deform, during the process of the staff placing the filling bone material into the bone grafting cavity 15, the filling bone material entering the fusion through groove 23 is likely to squeeze the shaping retaining net 4. At this time, through the blocking and restriction of the elastic baffle 24 on the shaping retaining net 4, it is avoided that the shaping retaining net 4 deforms and protrudes in advance when placing the filling bone material, and it is avoided that the protruding shaping retaining net 4 affects the normal implantation of the intervertebral fusion device.

[0020] As an embodiment of the present invention, the fusion through groove 23 includes multiple groups of unit grooves, and the cross section of the unit groove is rectangular; Since the intervertebral fusion cage needs to bear the supporting function in the intervertebral disc, the intervertebral fusion cage needs to have a relatively large strength. However, opening a relatively large and integral fusion through groove 23 on the fusion cage body 2 will have an adverse effect on the structural strength of the intervertebral fusion cage and reduce the supporting effect of the intervertebral fusion cage on the intervertebral disc. As a result, during the use of the intervertebral fusion cage, deformation and damage are likely to occur, affecting the normal use of the intervertebral fusion cage. Meanwhile, by opening multiple groups of unit grooves on the fusion cage body 2 and using the unit grooves to form the fusion through groove 23, the adverse effect of the integral and relatively large fusion through groove 23 on the structural strength of the fusion cage body 2 can be avoided, ensuring the normal use of the intervertebral fusion cage after implantation and supporting the intervertebral disc.

[0021] As an embodiment of the present invention, one end of the elastic baffle 24 is fixedly installed at the end of the fusion cage body 2 away from the fixing plate 1, and the opening direction of the elastic baffle 24 when it is squeezed and pushed open faces the fixing plate 1. Since one end of the elastic baffle 24 is fixedly installed at the end away from the fixing plate 1, after the movable plate 31 squeezes and pushes the filling bone material in the bone grafting cavity 15, causing the filling bone material to be extruded from the fusion through groove 23, the elastic baffle 24 will be squeezed and deformed, that is, the end of the elastic baffle 24 close to the fixing plate 1 will gradually tilt upward, making the opening of the elastic baffle 24 after being pushed open face the fixing plate 1. At this time, the filling bone material extruded from the fusion through groove 23 will cause the shaping retaining net 4 to be propped up and expanded in the direction close to the fixing plate 1, so that the extruded filling bone material is relatively easy to contact the position of the vertebral body edge, thereby promoting intervertebral disc fusion and improving the fusion effect and fusion speed. Meanwhile, since the opening of the elastic baffle 24 after being pushed up faces the fixing plate 1, the filling bone material extruded from the fusion through groove 23 and the expanded shaping retaining net 4 are convenient for the staff to observe, and thus it is convenient for the staff to observe the shape of the extruded filling bone material in the intervertebral disc and the fitting condition between the filling bone material and the intervertebral disc, ensuring good use effect of the intervertebral fusion cage.

[0022] As an embodiment of the present invention, a placement groove 241 is formed on the elastic baffle 24, and an elastic tooth 242 is installed in the placement groove 241. After the elastic tooth 242 pops out of the placement groove 241, it is inclined relative to the bottom surface of the placement groove 241. After the elastic baffle 24 is lifted by the extruded filling bone material, the elastic teeth 242 pop out from the placement groove 241 on the elastic baffle 24, and the elastic teeth 242 will contact the intervertebral disc. Thus, the friction between the elastic teeth 242 and the intervertebral disc is utilized to position and limit the position of the elastic baffle 24 within the intervertebral disc, preventing the lifted elastic baffle 24 from shifting due to the patient's movement after the intervertebral fusion device is implanted into the intervertebral disc, which may cause the elastic baffle 24 to squeeze the shaping net 4 and the filling bone material within the shaping net 4, resulting in deformation and movement of the filling bone material, affecting the subsequent bone in-growth within the intervertebral disc, as well as the subsequent intervertebral disc fusion effect and fusion speed.

[0023] As an embodiment of the present invention, the inclination direction of the elastic teeth 242 is towards the direction away from the fixing plate 1, and the teeth at the end of the elastic teeth 242 away from the placement groove 241 are inclined towards the direction of the fusion device main body 2; Since the teeth on the elastic teeth 242 are inclined towards the direction of the fusion device main body 2, when the elastic baffle 24 is ejected from the installation groove 25 on the fusion device main body 2, the teeth on the elastic teeth 242 will not obstruct or interfere with the ejection process of the elastic baffle 24, ensuring the smooth ejection of the elastic baffle 24. At the same time, due to the teeth being inclined towards the direction of the fusion device main body 2, the elastic teeth 242 will perform one-way limiting on the movement of the elastic baffle 24, preventing the elastic baffle 24 from retracting towards the direction of the fusion device main body 2 after ejection, ensuring the stability of the position of the elastic baffle 24 within the intervertebral disc.

[0024] As an embodiment of the present invention, sliding grooves 32 are provided on the inner wall of the bone grafting cavity 15, and protrusions are provided at both ends of the movable plate 31, and the protrusions are slidably installed in the sliding grooves 32; By providing the sliding grooves 32 on the inner wall of the bone grafting cavity 15, when the movable plate 31 is driven by the adjusting rod 3, the movable plate 31 can move stably along the sliding grooves 32, preventing the movable plate 31 from shifting or skewing when squeezing and pushing the filling bone material, ensuring the normal operation of the movable plate 31. At the same time, the position of the movable plate 31 within the bone grafting cavity 15 is restricted by the sliding grooves 32, preventing the movable plate 31 from shifting or deflecting when the staff places the filling bone material and implants the intervertebral fusion device, affecting the implantation and normal use of the intervertebral fusion device.

[0025] As an embodiment of the present invention, the shaping net 4 is made of a biodegradable material, and a developing wire is provided in the shaping net 4, and the strength of the developing wire is greater than the strength of the shaping net 4; Since the shaping retaining net 4 is soft and needs to change from a folded state to a propped-up and inflated state, by adding a developer wire to the wires that make up the shaping retaining net 4, it is convenient for the staff to observe and position the shaping retaining net during the operation through the developer wire, ensuring good implantation effect of the intervertebral fusion device. At the same time, since the filling bone material is extruded from the fusion through slot 23 and filled into the shaping retaining net 4, the shaping retaining net 4 will be subjected to the extrusion force of the filling bone material. At this time, through the developer wire in the shaping retaining net 4, the strength of the shaping retaining net 4 is enhanced, avoiding damage to the shaping retaining net 4 during use and affecting the normal use of the intervertebral fusion device.

[0026] The specific working process is as follows: Before the intervertebral fusion device is implanted into the intervertebral disc, the staff places the filling bone material into the bone grafting cavity 15. At the same time, since the fusion device main body 2 is provided with a fusion through slot 23, when placing the filling bone material, the fusion through slot 23 will also be filled with the filling bone material. After that, after the intervertebral fusion device is installed into the intervertebral disc, the staff rotates the adjusting rod 3 in the injection hole 14 through a tool, so that the movable plate 31 in the bone grafting cavity 15 moves away from the fixed plate 1 under the action of the adjusting rod 3, squeezing and pushing the filling bone material in the bone grafting cavity 15, so that the corresponding position of the bone grafting cavity 15 in the intervertebral disc fully contacts the filling bone aggregate; At the same time, after the filling bone material in the bone grafting cavity 15 is pushed and squeezed by the movable plate 31, the filling bone material will be extruded from the fusion through slot 23 and then enter the shaping retaining net 4, causing the shaping retaining net 4 to be gradually propped up and inflated by the filling material entering its interior, increasing the bone grafting area in the intervertebral disc and increasing the area of the vertebral body edge position in the intervertebral disc contacting the filling bone material, promoting the fusion at the edge position of the intervertebral disc. At the same time, after the shaping retaining net 4 is propped up by the filling bone material inside, the shaping retaining net 4 will fully adhere to the surface of the intervertebral disc, making the filling bone material in the shaping retaining net 4 fully contact the intervertebral disc; At the same time, in the initial state, the shaping retaining net 4 can be folded and close to the side of the fusion device main body 2; At the same time, the shaping retaining net 4 limits and positions the filling bone aggregate extruded from the fusion through slot 23, preventing the extruded filling bone aggregate from dispersing in the intervertebral disc; At the same time, after the adjusting rod 3 drives the movable plate 31 to move, the filling bone material in the bone grafting cavity 15 is squeezed into the shaping retaining net 4, and the filling bone material in the area of the bone grafting cavity 15 close to the fixed plate 1 is relatively less and lacking. At this time, since a fixing block 141 is installed in the injection hole 14 and the fixing block 141 is rotatably connected to the adjusting rod 3, there will be a gap between the injection hole 14 and the adjusting rod 3, so that the staff injects additional filling bone material into the bone grafting cavity 15 from the injection hole 14, increasing the filling amount of the filling bone material and ensuring sufficient filling bone material in the bone grafting cavity 15 and sufficient contact between the filling bone material and the intervertebral disc; By installing an elastic baffle 24 on the side of the fusion device main body 2, the shaping retaining net 4 is pressed and restricted by the elastic baffle 24 to prevent the shaping retaining net 4 from deforming, dispersing, and protruding randomly on the fusion device main body 2; Meanwhile, through the blocking and restriction of the elastic baffle 24 on the shaping retaining net 4, it is avoided that the shaping retaining net 4 deforms and protrudes in advance when filling bone materials, which affects the normal implantation of the intervertebral fusion device; Meanwhile, multiple groups of unit grooves are opened on the fusion device main body 2, and the unit grooves are used to form a fusion through groove 23, thereby avoiding the adverse effect of the overall and relatively large fusion through groove 23 on the structural strength of the fusion device main body 2, and ensuring the normal use of the intervertebral fusion device after implantation and supporting the intervertebral disc; Since one end of the elastic baffle 24 is fixedly installed at the end far from the fixing plate 1, the opening after the elastic baffle 24 is pushed open faces the fixing plate 1. At this time, the filling bone material extruded from the fusion through groove 23 will cause the shaping retaining net 4 to support and expand in the direction close to the fixing plate 1, and then make the extruded filling bone material relatively easy to contact the position of the vertebral body edge; Meanwhile, since the opening after the elastic baffle 24 is pushed up faces the fixing plate 1, it will make the filling bone material extruded from the fusion through groove 23 and the expanded shaping retaining net 4 easy to be observed by the staff, and then it is convenient for the staff to observe the shape of the extruded filling bone material in the intervertebral disc and the fitting condition between the filling bone material and the intervertebral disc; After the elastic baffle 24 is pushed up by the extruded filling bone material, the elastic teeth 242 pop out from the placement groove 241 on the elastic baffle 24, and the elastic teeth 242 will contact the intervertebral disc, so as to use the friction between the elastic teeth 242 and the intervertebral disc to position and restrict the position of the elastic baffle 24 in the intervertebral disc; Since the teeth on the elastic teeth 242 are inclined towards the direction of the fusion device main body 2, when the elastic baffle 24 is pushed out from the installation groove 25 on the fusion device main body 2, the teeth on the elastic teeth 242 will not block or interfere with the pushing-out process of the elastic baffle 24. At the same time, since the teeth are inclined towards the direction of the fusion device main body 2, the elastic teeth 242 will perform one-way limit on the movement of the elastic baffle 24 to prevent the elastic baffle 24 from retracting towards the fusion device main body 2 after being pushed out; By opening a sliding groove 32 on the inner wall of the bone grafting cavity 15, when the movable plate 31 is driven by the adjusting rod 3, the movable plate 31 can move stably along the sliding groove 32 to prevent the movable plate 31 from shifting and skewing; By adding developing wires to the wires forming the shaping retaining net 4, it is convenient for the staff to observe and position the shaping retaining net during the operation through the developing wires. At the same time, since the filling bone material is extruded from the fusion through groove 23 and filled into the shaping retaining net 4, the shaping retaining net 4 will be subjected to the extrusion force of the filling bone material. At this time, through the developing wires in the shaping retaining net 4, the strength of the shaping retaining net 4 is improved to avoid damage to the shaping retaining net 4 during use.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An anterior cervical interbody fusion device, comprising a fixing plate (1) and a fusion device main body (2). The fixing plate (1) is installed on the fusion device main body (2). The area enclosed between the fusion device main body (2) and the fixing plate (1) is a bone grafting cavity (15). The fixing plate (1) is provided with screw holes (11), and screws (12) are installed in the screw holes (11). Tooth projections (21) are uniformly arranged on the surface of the fusion device main body (2). It is characterized in that: A fusion through groove (23) is provided on the fusion device main body (2). The fusion through groove (23) communicates the bone grafting cavity (15) with the space outside the fusion main body. A shaping retaining net (4) is installed at the opening of the fusion through groove (23). An injection hole (14) is provided on the fixing plate (1). An adjusting rod (3) is installed in the injection hole (14). A movable plate (31) is installed on the adjusting rod (3). The movable plate (31) is located in the bone grafting cavity (15). A fixing block (141) is installed in the injection hole (14). The fixing block (141) is rotatably connected to the adjusting rod (3). The adjusting rod (3) is threadedly connected to the movable plate (31).

2. The anterior cervical interbody fusion device according to claim 1, wherein: An installation groove (25) is provided on the outer side surface of the fusion device main body (2). An elastic baffle (24) is installed in the installation groove (25). The elastic baffle (24) shields and closes the opening of the fusion through groove (23). The shaping retaining net (4) is installed between the elastic baffle (24) and the side wall at the opening of the fusion through groove (23).

3. The anterior cervical interbody fusion device according to claim 1, characterized in that: The fusion through groove (23) comprises a plurality of groups of unit grooves, and the cross section of the unit groove is rectangular.

4. The anterior cervical interbody fusion device according to claim 2, characterized in that: One end of the elastic baffle (24) is fixedly installed at the end of the fusion device main body (2) away from the fixing plate (1). When the elastic baffle (24) is squeezed and pushed open, the opening direction faces the fixing plate (1).

5. The anterior cervical interbody fusion device according to claim 4, wherein: A placement groove (241) is provided on the elastic baffle (24). An elastic tooth (242) is installed in the placement groove (241). After the elastic tooth (242) pops out of the placement groove (241), it is inclined relative to the bottom surface of the placement groove (241).

6. The anterior cervical interbody fusion device according to claim 5, wherein: The inclination direction of the elastic tooth (242) faces away from the fixing plate (1). The tooth of the elastic tooth (242) at the end away from the placement groove (241) is inclined towards the direction of the fusion device main body (2).

7. The anterior cervical interbody fusion device according to claim 1, wherein: Sliding grooves (32) are provided on the inner wall of the bone grafting cavity (15). Both ends of the movable plate (31) are provided with protrusions, and the protrusions are slidably installed in the sliding grooves (32).

8. The anterior cervical interbody fusion device according to claim 1, characterized in that: The shaping retaining net (4) is made of a biodegradable material. A developing wire is arranged in the shaping retaining net (4), and the strength of the developing wire is greater than the strength of the shaping retaining net (4).

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