Anterior cervical interbody fusion cage

Abstract

The present invention belongs to the technical field of medical implant prostheses, specifically a cervical anterior intervertebral fusion device, comprising a fixing plate and a fusion device body, the fixing plate being mounted on the fusion device body, the area enclosed between the fusion device body and the fixing plate being a bone grafting cavity, and screws being mounted on the fixing plate; a fusion groove being provided on the fusion device body, and a shaped blocking net being mounted at the opening of the fusion groove; an injection hole being provided on the fixing plate, an adjusting rod being mounted in the injection hole, a movable plate being mounted on the adjusting rod, the movable plate being located in the bone grafting cavity, a fixing block being mounted in the injection hole, the fixing block being rotatably connected to the adjusting rod, and the adjusting rod being threadedly connected to the movable plate; the present invention has a simple structure, can increase the contact area and contact effect between the vertebral body edge and the fusion device, avoids increasing the size of the fusion device, facilitates the implantation of the fusion device during cervical spine surgery, and improves the fusion effect and fusion speed.

Description

Technical Field

[0001] The invention belongs to the technical field of medical implant prostheses, in particular to an anterior cervical intervertebral fusion device. Background Art

[0002] Anterior cervical intervertebral fusion devices are orthopedic implants used to treat conditions such as cervical spondylotic myelopathy, cervical radiculopathy, cervical disc herniation, and spinal stenosis. The surgeon first makes a transverse incision on the right anterior side of the neck to fully expose the anterior margin of the cervical vertebral body. Under fluoroscopy, the intervertebral space of the injured cervical vertebra is located, the damaged area of ​​the cervical vertebra is cleaned, the intervertebral disc at the injured site is removed, a distractor is inserted into the intervertebral space, a bone surface is ground onto the endplate to match the fusion device, the corresponding intervertebral disc is removed, the posterior longitudinal ligament is removed if necessary, and the bone graft bed is cleaned with a curette. After complete decompression, a matching fusion device is implanted.

[0003] In practice, through postoperative observation of a large number of cervical fusion surgeries, it was found that some patients showed fusion of the lateral side of the vertebra (the part without bone grafting on the outside of the fusion cage) in a short period of time, while the bone grafting part inside the fusion cage had not yet fused. This proves that the edge of the cervical vertebra is easier to fuse than the center. At the same time, since the incision of minimally invasive cervical surgery is relatively small, larger intervertebral fusion cages or directly adding baffles around the intervertebral fusion cages may be difficult to implant. At the same time, the contact effect between the side of the implanted intervertebral fusion cage and the edge of the vertebral body is not good, which can easily affect the effect and speed of intervertebral disc fusion. Summary of the Invention

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

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: the present invention provides an anterior cervical intervertebral fusion device, comprising a fixation plate and a device body, wherein the fixation plate is mounted on the device body, the area enclosed between the device body and the fixation plate is a bone graft cavity, the fixation plate is provided with a screw hole, a screw is mounted in the screw hole, and protruding teeth are evenly arranged on the surface of the device body;

[0006] A fusion groove is provided on the fusion device body, connecting the bone graft cavity with the space outside the fusion body, and a shaped blocking net is installed at the opening of the fusion groove;

[0007] An injection hole is provided on the fixed plate, 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 fixed block is installed in the injection hole, the fixed block is rotatably connected to the adjusting rod, and the adjusting rod and the movable plate are connected by threads.

[0008] Preferably, a mounting groove is provided on the outer surface of the fusion device body, and an elastic baffle is installed in the mounting groove, and the elastic baffle blocks and closes the opening of the fusion groove;

[0009] The shaped barrier is installed between the elastic baffle and the side wall at the opening of the fusion groove.

[0010] Preferably, the fusion groove includes a plurality of unit grooves, and the cross-section of the unit groove is rectangular.

[0011] Preferably, one end of the elastic baffle is fixedly mounted on an end of the fusion device body away from the fixing plate, and the opening direction of the elastic baffle when being squeezed and pushed open is toward the fixing plate.

[0012] Preferably, a placement groove is provided on the elastic baffle, and an elastic tooth is installed in the placement groove. After the elastic tooth pops out from the placement groove, it is tilted relative to the bottom surface of the placement groove.

[0013] Preferably, the elastic teeth are inclined in a direction away from the fixing plate, and the teeth of the elastic teeth at one end away from the placement slot are inclined in a direction toward the fusion device body.

[0014] Preferably, a slide groove is provided on the inner wall of the bone graft cavity, and protrusions are provided at both ends of the movable plate, and the protrusions are slidably installed in the slide groove.

[0015] Preferably, the shaped barrier is made of a degradable material, and a developing wire is provided in the shaped barrier, and the strength of the developing wire is greater than the strength of the shaped barrier.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The anterior cervical intervertebral fusion device described in the present invention is provided with a fusion groove, an adjustment rod, a movable plate, and a shaped barrier. After the intervertebral fusion device is implanted into the intervertebral disc, the adjustment rod drives the movable plate to move, squeezing the filling bone material in the bone graft cavity from the fusion groove into the shaped barrier, so that the shaped barrier is propped up and expanded, thereby increasing the size of the intervertebral fusion device in the intervertebral disc, and increasing the contact area and contact effect between the shaped barrier and the extruded filling bone material and the edge of the vertebral body, 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 intervertebral fusion device.

[0018] 2. The anterior cervical intervertebral fusion device described in the present invention is provided with an elastic baffle, a preventing groove, and elastic teeth, thereby limiting the shaped barrier before implantation, thereby preventing the deformed or protruding shaped barrier from affecting the implantation of the intervertebral fusion device. At the same time, the elastic teeth increase the friction between the elastic baffle and the intervertebral disc, and perform one-way limitation and fixation on the position of the elastic baffle in the intervertebral disc, thereby preventing the elastic baffle from being displaced by the patient's movement after implantation of the intervertebral fusion device, thereby affecting the fusion effect and fusion speed of the intervertebral disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 is a stereoscopic view of the intervertebral fusion cage of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the fixation plate in the intervertebral fusion cage of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the intervertebral fusion cage body of the present invention;

[0023] Figure 4 Schematic diagram of the structure of the intervertebral fusion cage of the present invention after implantation; wherein the fixed block is not marked;

[0024] Figure 5 This is a schematic diagram of the installation of the shaped barrier and the fusion device body in the intervertebral fusion device of the present invention;

[0025] Figure 6 It is a partial cross-sectional view of the shaped mesh and the fusion device body in the intervertebral fusion device of the present invention;

[0026] In the figure: fixing plate 1, screw hole 11, screw 12, connecting arm 13, injection hole 14, fixing block 141, bone graft cavity 15, fusion device body 2, protruding teeth 21, fixing groove 22, fusion groove 23, elastic baffle 24, placement groove 241, elastic teeth 242, installation groove 25, adjustment rod 3, movable plate 31, slide groove 32, and shaped barrier 4. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0028] like Figures 1 to 6As shown, the present invention provides an anterior cervical intervertebral fusion device, comprising a fixation plate 1 and a device body 2. The fixation plate 1 is mounted on the device body 2. The area enclosed between the device body 2 and the fixation plate 1 is a bone graft cavity 15. The fixation plate 1 is provided with a screw hole 11, in which a screw 12 is mounted. The surface of the device body 2 is evenly provided with protruding teeth 21.

[0029] The fusion device body 2 is provided with a fusion groove 23, which connects the bone graft cavity 15 with the space outside the fusion body. A shaped barrier 4 is installed at the opening of the fusion groove 23.

[0030] The fixing plate 1 is provided with an injection hole 14, 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 graft 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 and the movable plate 31 are connected by threads;

[0031] The fixing plate 1 is provided with symmetrically distributed connecting arms 13, and the connecting arms 13 are provided with clamping blocks. When the fixing plate 1 is installed on the fusion device body 2, the clamping blocks on the connecting arms 13 are inserted into the fixing grooves 22 on the fusion device body 2. At the same time, the fusion device body 2 is U-shaped, and the space enclosed between the fixing plate 1 and the fusion device body 2 is a bone graft cavity 15 for placing filling bone material.

[0032] 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 body 2 increase the friction force of the intervertebral fusion device in the intervertebral disc, thereby improving the installation effect of the intervertebral fusion device;

[0033] Before the intervertebral fusion device is implanted into the intervertebral disc, the staff places the filling bone material into the bone graft cavity 15. At the same time, since the fusion groove 23 is provided on the fusion device body 2, when the filling bone material is placed, the fusion groove 23 is also filled with the filling bone material. Afterwards, after the intervertebral fusion device is installed in the intervertebral disc, the staff rotates the adjustment rod 3 in the injection hole 14 with a tool, so that the movable plate 31 in the bone graft cavity 15 moves away from the fixed plate 1 under the action of the adjustment rod 3, thereby squeezing and pushing the filling bone material in the bone graft cavity 15.

[0034] At the same time, after the intervertebral fusion device is implanted in the intervertebral disc, the upper and lower parts of the intervertebral fusion device will be tightly attached to the end plates in the intervertebral disc, that is, the openings in the upper and lower directions of the bone graft cavity 15 will be closed by the end plates in the intervertebral disc. Therefore, when the movable plate 31 moves and squeezes and pushes the filling bone material in the bone graft cavity 15, the filling bone material will not be squeezed out from the upper or lower part of the bone graft cavity 15. In addition, since the filling aggregate in the bone graft cavity 15 is squeezed and pushed, the corresponding position of the bone graft cavity 15 in the intervertebral disc will be fully in contact with the filling aggregate, which is beneficial to the subsequent bone creeping growth and improves the fusion speed and fusion effect.

[0035] At the same time, after the filling bone material in the bone graft cavity 15 is pushed and squeezed by the movable plate 31, the filling bone material will be squeezed out from the fusion groove 23 and then enter the shaping barrier 4, so that the shaping barrier 4 is gradually supported and expanded by the filling material entering therein. At the same time, after the shaping barrier 4 is supported and expanded, it will effectively increase and occupy the area of ​​the intervertebral fusion device in the lateral direction of the intervertebral disc, even if the bone graft area in the intervertebral disc is increased, thereby increasing the area of ​​the vertebral edge position in the intervertebral disc that contacts the filling bone material, promoting the fusion of the intervertebral disc edge position, and thus improving the fusion effect and fusion speed of the intervertebral fusion device. At the same time, after the shaping barrier 4 is supported by the filling bone material inside, the shaping barrier 4 will fully fit to the surface of the intervertebral disc, so that the filling bone material in the shaping barrier 4 is fully in contact with the intervertebral disc, which is convenient for the later bone creeping growth and improves the intervertebral disc fusion effect.

[0036] At the same time, the shaped barrier 4 can be folded and attached to the side of the fusion device body 2 in the initial state, avoiding increasing the width of the fusion device 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 during cervical spine surgery, and reducing the difficulty of implantation.

[0037] At the same time, the shaping screen 4 limits and positions the filler aggregate extruded from the fusion slot 23, preventing the extruded filler aggregate from dispersing in the intervertebral disc and affecting the patient's health. At the same time, the size and shape of the shaping screen 4 can also shape the shape of the extruded filler bone material in the intervertebral disc, ensuring sufficient contact between the extruded filler bone material and the side of the intervertebral fusion cage and the area near the edge of the vertebral body, thereby improving the intervertebral disc fusion effect and fusion speed.

[0038] At the same time, after the adjusting rod 3 drives the movable plate 31 to move, the filling bone material in the bone graft cavity 15 is squeezed into the shaping barrier 4, and the filling bone material in the area near the fixed plate 1 in the bone graft cavity 15 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, a gap will be created between the injection hole 14 and the adjusting rod 3, so that the staff can inject additional filling bone material into the bone graft cavity 15 from the injection hole 14, increase the filling amount of the filling bone material, ensure that the bone graft cavity 15 is sufficiently filled with bone material and the filling bone material fully contacts the intervertebral disc, thereby avoiding the existence of a lack of filling bone material or a scarce area in the bone graft cavity 15, which affects the fusion effect and fusion speed of the intervertebral fusion device in the intervertebral disc.

[0039] As an embodiment of the present invention, a mounting groove 25 is provided on the outer surface of the fusion device body 2, and an elastic baffle 24 is installed in the mounting groove 25, and the elastic baffle 24 blocks and closes the opening of the fusion groove 23;

[0040] The shaped barrier 4 is installed between the elastic baffle 24 and the side wall of the opening of the fusion groove 23;

[0041] By installing an elastic baffle 24 on the side of the fusion device body 2, the elastic baffle 24 is used to compress and restrict the shaped barrier 4, thereby preventing the shaped barrier 4 from being deformed, dispersed or protruded on the fusion device body 2 and affecting the implantation of the intervertebral fusion device;

[0042] At the same time, since the shaping barrier 4 is soft and easy to deform, when the staff places the filling bone material into the bone graft cavity 15, the filling bone material entering the fusion groove 23 is likely to squeeze the shaping barrier 4. At this time, the elastic baffle 24 blocks and restricts the shaping barrier 4, thereby preventing the shaping barrier 4 from being deformed and protruding in advance when the filling bone material is placed, and preventing the protruding shaping barrier 4 from affecting the normal implantation of the intervertebral fusion device.

[0043] As an embodiment of the present invention, the fusion groove 23 includes a plurality of unit grooves, and the cross section of the unit groove is rectangular;

[0044] Since the intervertebral fusion cage needs to play a supporting role in the intervertebral disc, it needs to have great strength. However, providing a large, integral fusion 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, the intervertebral fusion cage is prone to deformation and damage during use, affecting the normal use of the intervertebral fusion cage.

[0045] At the same time, multiple groups of unit grooves are opened on the fusion device body 2, and the unit grooves are used to form a fusion groove 23, thereby avoiding the adverse effect of the overall, relatively large fusion groove 23 on the structural strength of the fusion device body 2, ensuring the normal use of the intervertebral fusion device after implantation and supporting the intervertebral disc.

[0046] As an embodiment of the present invention, one end of the elastic baffle 24 is fixedly mounted on the end of the fusion device body 2 away from the fixing plate 1, and the opening direction of the elastic baffle 24 when being squeezed and pushed open is toward the fixing plate 1;

[0047] Since one end of the elastic baffle 24 is fixedly mounted at the end away from the fixed plate 1, when the movable plate 31 squeezes and pushes the filling bone material in the bone graft cavity 15 and squeezes the filling bone material out of the fusion groove 23, the elastic baffle 24 is squeezed and deformed, that is, the end of the elastic baffle 24 close to the fixed plate 1 gradually tilts up, so that the opening of the elastic baffle 24 after being pushed open faces the fixed plate 1. At this time, the filling bone material squeezed out of the fusion groove 23 will cause the shaping barrier 4 to prop up and expand in the direction close to the fixed plate 1, thereby making it relatively easy for the extruded filling bone material to contact the edge of the vertebral body, thereby promoting intervertebral disc fusion and improving the fusion effect and fusion speed;

[0048] At the same time, since the opening of the elastic baffle 24 after being pushed up is facing the fixed plate 1, the filling bone material extruded in the fusion groove 23 and the expanded shaping barrier 4 can be easily 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 fit between the filling bone material and the intervertebral disc, thereby ensuring the good use effect of the intervertebral fusion device.

[0049] As an embodiment of the present invention, the elastic baffle 24 is provided with a placement groove 241, 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 tilted relative to the bottom surface of the placement groove 241.

[0050] After the elastic baffle 24 is lifted 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, thereby utilizing the friction between the elastic teeth 242 and the intervertebral disc to locate and limit the position of the elastic baffle 24 in the intervertebral disc, thereby preventing the elastic baffle 24 that has been lifted up from being affected by the patient's movement after the intervertebral fusion device is implanted in the intervertebral disc and being displaced, causing the elastic baffle 24 to squeeze the shaping barrier 4 and the filling bone material in the shaping barrier 4, causing the filling bone material to deform and move, affecting the subsequent bone creeping growth in the intervertebral disc, as well as affecting the subsequent intervertebral disc fusion effect and fusion speed.

[0051] As an embodiment of the present invention, the elastic teeth 242 are inclined in a direction away from the fixing plate 1 , and the teeth of the elastic teeth 242 at one end away from the placement slot 241 are inclined toward the fusion device body 2 ;

[0052] Since the teeth on the elastic teeth 242 are inclined toward the direction of the fusion device body 2, when the elastic baffle 24 is ejected from the mounting groove 25 on the fusion device body 2, the teeth on the elastic teeth 242 will not block or interfere with the ejection process of the elastic baffle 24, thereby ensuring that the elastic baffle 24 is ejected smoothly. At the same time, since the teeth are inclined toward the direction of the fusion device body 2, the elastic teeth 242 will limit the movement of the elastic baffle 24 in one direction, thereby preventing the elastic baffle 24 from retreating toward the fusion device body 2 after being ejected, thereby ensuring the stability of the position of the elastic baffle 24 in the intervertebral disc.

[0053] As an embodiment of the present invention, a slide groove 32 is provided on the inner wall of the bone graft cavity 15, and protrusions are provided at both ends of the movable plate 31, and the protrusions are slidably installed in the slide groove 32;

[0054] By providing a sliding groove 32 on the inner wall of the bone graft 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, avoiding displacement or tilting of the movable plate 31 when squeezing and pushing the filling bone material, thereby ensuring the normal operation of the movable plate 31. At the same time, the sliding groove 32 is used to limit the position of the movable plate 31 in the bone graft cavity 15, thereby avoiding displacement or deflection of the movable plate 31 when the staff places the filling bone material or implants the intervertebral fusion device, thereby affecting the implantation and normal use of the intervertebral fusion device.

[0055] As an embodiment of the present invention, the shaped barrier 4 is made of a degradable material, and a developing wire is provided in the shaped barrier 4, and the strength of the developing wire is greater than the strength of the shaped barrier 4;

[0056] Since the shaping net 4 is soft and needs to be changed from a folded state to a propped-up and expanded state, by adding a developing wire to the wire that makes up the shaping net 4, it is convenient for the staff to observe and position the shaping net through the developing wire during the operation, thereby ensuring a good implantation effect of the intervertebral fusion device. At the same time, since the filling bone material is squeezed out from the fusion groove 23 and filled into the shaping net 4, the shaping net 4 will be subjected to the squeezing force of the filling bone material. At this time, the developing wire in the shaping net 4 can enhance the strength of the shaping net 4, thereby preventing the shaping net 4 from being damaged during use and affecting the normal use of the intervertebral fusion device.

[0057] The specific workflow is as follows:

[0058] Before the intervertebral fusion device is implanted into the intervertebral disc, the staff places the filling bone material into the bone graft cavity 15. At the same time, since the fusion device body 2 is provided with a fusion groove 23, when the filling bone material is placed, the fusion groove 23 will be filled with the filling bone material. Afterwards, after the intervertebral fusion device is installed in the intervertebral disc, the staff rotates the adjustment rod 3 in the injection hole 14 with a tool, so that the movable plate 31 in the bone graft cavity 15 moves in a direction away from the fixed plate 1 under the action of the adjustment rod 3, squeezing and pushing the filling bone material in the bone graft cavity 15, so that the corresponding position of the bone graft cavity 15 in the intervertebral disc is fully in contact with the filling bone material.

[0059] At the same time, after the filling bone material in the bone graft cavity 15 is pushed and squeezed by the movable plate 31, the filling bone material will be squeezed out from the fusion groove 23 and then enter the shaping barrier 4, so that the shaping barrier 4 is gradually supported and expanded by the filling material entering therein, thereby increasing the bone graft area in the intervertebral disc and the area where the vertebral edge of the intervertebral disc contacts the filling bone material, thereby promoting the fusion of the intervertebral disc edge. At the same time, after the shaping barrier 4 is supported by the filling bone material inside, the shaping barrier 4 will fully fit the surface of the intervertebral disc, so that the filling bone material in the shaping barrier 4 is in full contact with the intervertebral disc.

[0060] At the same time, the shaped barrier 4 can be folded and attached to the side of the fusion device body 2 in the initial state;

[0061] At the same time, the filling aggregate extruded from the fusion groove 23 is limited and positioned by the shaped barrier 4 to prevent the extruded filling aggregate from being dispersed in the intervertebral disc;

[0062] At the same time, after the adjusting rod 3 drives the movable plate 31 to move, the filling bone material in the bone graft cavity 15 is squeezed into the shaping barrier 4, and the filling bone material in the area of ​​the bone graft cavity 15 near the fixed 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, a gap will be created between the injection hole 14 and the adjusting rod 3, so that the staff can inject additional filling bone material into the bone graft cavity 15 from the injection hole 14, increase the filling amount of the filling bone material, and ensure that the bone graft cavity 15 is filled with sufficient bone material and the filled bone material fully contacts the intervertebral disc;

[0063] By installing an elastic baffle 24 on the side of the fusion device body 2, the elastic baffle 24 is used to compress and restrict the shaped barrier 4, thereby preventing the shaped barrier 4 from being deformed, dispersed, or protruded on the fusion device body 2 at will;

[0064] At the same time, the elastic baffle 24 blocks and restricts the shaped barrier 4, thereby preventing the shaped barrier 4 from deforming or protruding in advance when the bone filling material is placed, thereby affecting the normal implantation of the intervertebral fusion cage.

[0065] At the same time, multiple groups of unit grooves are provided on the fusion device body 2, and the unit grooves are used to form a fusion groove 23, thereby avoiding the adverse effect of the overall, relatively large fusion groove 23 on the structural strength of the fusion device body 2, ensuring the normal use of the intervertebral fusion device after implantation and supporting the intervertebral disc;

[0066] Since one end of the elastic baffle 24 is fixedly mounted at the end away from the fixing plate 1, when the elastic baffle 24 is pushed open, the opening faces the fixing plate 1. At this time, the filling bone material extruded from the fusion groove 23 will cause the shaping barrier 4 to be propped up and expanded toward the fixing plate 1, thereby making it relatively easy for the extruded filling bone material to contact the edge of the vertebral body.

[0067] At the same time, since the opening of the elastic baffle 24 after being lifted is toward the fixing plate 1, the filling bone material extruded from the fusion groove 23 and the expanded shaping barrier 4 can be easily observed by the staff, thereby facilitating the staff to observe the shape of the extruded filling bone material in the intervertebral disc and the fit between the filling bone material and the intervertebral disc;

[0068] After the elastic baffle 24 is lifted up by the extruded filling bone material, the elastic teeth 242 pop out from the placement grooves 241 on the elastic baffle 24 and contact the intervertebral disc, thereby positioning and limiting the position of the elastic baffle 24 in the intervertebral disc by utilizing the friction between the elastic teeth 242 and the intervertebral disc;

[0069] Since the teeth on the elastic teeth 242 are inclined toward the fusion device body 2, when the elastic baffle 24 is ejected from the mounting groove 25 on the fusion device body 2, the teeth on the elastic teeth 242 will not block or interfere with the ejection process of the elastic baffle 24. At the same time, since the teeth are inclined toward the fusion device body 2, the elastic teeth 242 will unidirectionally limit the movement of the elastic baffle 24, thereby preventing the elastic baffle 24 from retreating toward the fusion device body 2 after being ejected.

[0070] By providing a sliding groove 32 on the inner wall of the bone graft 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, thereby preventing the movable plate 31 from being offset or skewed;

[0071] By adding developing wires to the lines that make up the shaping net 4, it is convenient for staff to observe and locate the shaping net during the operation through the developing wires. At the same time, since the filling bone material is squeezed out from the fusion groove 23 and filled into the shaping net 4, the shaping net 4 will be subjected to the squeezing force of the filling bone material. At this time, the developing wires in the shaping net 4 can improve the strength of the shaping net 4 and avoid damage to the shaping net 4 during use.

[0072] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A cervical anterior intervertebral fusion device, comprising a fixing plate (1) and a fusion device body (2), wherein the fixing plate (1) is mounted on the fusion device body (2), an area enclosed between the fusion device body (2) and the fixing plate (1) is a bone graft cavity (15), a screw hole (11) is provided on the fixing plate (1), a screw (12) is installed in the screw hole (11), and protruding teeth (21) are uniformly arranged on the surface of the fusion device body (2); Its characteristics are: The fusion device body (2) is provided with a fusion groove (23), the fusion groove (23) connects the bone graft cavity (15) and the space outside the fusion body, and a shaped blocking net (4) is installed at the opening of the fusion 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 graft 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) and the movable plate (31) are connected via threads; An installation groove (25) is provided on the outer surface of the fusion device 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 groove (23); The shaped barrier (4) is installed between the elastic baffle (24) and the side wall of the opening of the fusion groove (23); One end of the elastic baffle (24) is fixedly mounted on an end of the fusion device body (2) away from the fixing plate (1), and the opening direction of the elastic baffle (24) when being squeezed and pushed open is toward the fixing plate (1); A sliding groove (32) is 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 groove (32).

2. The anterior cervical intervertebral fusion cage according to claim 1, characterized in that: The fusion groove (23) includes a plurality of unit grooves, and the cross section of the unit grooves is rectangular.

3. The anterior cervical intervertebral fusion cage according to claim 1, characterized in that: The elastic baffle (24) is provided with a placement groove (241), 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 tilted relative to the bottom surface of the placement groove (241).

4. The anterior cervical intervertebral fusion cage according to claim 3, characterized in that: The inclination direction of the elastic teeth (242) is toward a direction away from the fixing plate (1), and the teeth of the elastic teeth (242) at one end away from the placement groove (241) are inclined toward the fusion device body (2).

5. The anterior cervical intervertebral fusion cage according to claim 1, characterized in that: The shaping screen (4) is made of a degradable material, and a developing wire is provided in the shaping screen (4), and the strength of the developing wire is greater than the strength of the shaping screen (4).

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