Self-stability cervical interbody fusion cage

Abstract

The invention belongs to the technical field of medical implant prostheses, and particularly relates to a self-stability cervical interbody fusion cage which comprises a fixing plate and a fusion cage body. An adjusting rod is mounted in the fusion cage main body, a mounting groove is formed in the fusion cage main body, the adjusting rod and a sliding block are mounted in the mounting groove, a check block is mounted on the adjusting rod, and the check block drives the sliding block to move; an adjusting groove is formed in the fusion cage body, a connecting plate and a protruding tooth rod are installed in the adjusting groove, a contact plate is installed on the connecting plate, and a top block and a sliding block are connected through a pull rope; when the interbody fusion cage is implanted, the protruding toothed rod retracts, the surface of the protruding toothed rod is kept flat and smooth, implantation of the interbody fusion cage is facilitated, extrusion, friction and scratching are avoided, then after implantation, the protruding toothed rod stretches out, friction force between the interbody fusion cage and the vertebral body end plate is increased, and it is guaranteed that the fixing effect and stability of the interbody fusion cage are good; the treatment effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical implant prostheses, and specifically relates to a self-stabilizing cervical intervertebral fusion device. Background Art

[0002] Cervical spondylosis is a common orthopedic disease. Currently, it is common to implant a cervical intervertebral fusion device to replace the degenerated or necrotic part of the intervertebral disc that has been removed. After that, through the creeping substitution of bone tissue, the upper and lower intervertebral segments are fused to make the intervertebral segment more stable, so as to maintain the normal height and physiological curvature of the cervical spine sequence, achieve the purpose of treating cervical spine lesions, eliminating pain, preventing deformity, reconstructing spinal stability, and protecting spinal cord nerves.

[0003] In the prior art, it is necessary to select a trial mold with an appropriate height and depth according to the height of the intervertebral disc, the intervertebral space preparation technique, and the anatomical morphology of the patient, position the trial mold correctly along the correct cranial-caudal direction, and carefully implant it into the intervertebral space. At the same time, during the operation, the correct position of the trial mold is determined through X-ray imaging technology to ensure that after the segment is fully expanded, the trial mold is tightly and precisely placed between the end plates, so as to select a suitable implant footprint and size to adapt to the changes in the patient's anatomical structure. Therefore, during the implantation process of the intervertebral fusion device, the surface of the fusion device is in close contact and friction with the vertebral end plate, and is affected by the doctor's operation technique during the implantation process. It may be necessary to adjust the fusion device. During this process, extrusion friction, scraping will be formed between the small protrusions on the surface of the fusion device and the vertebral end plate, and the tips of some small protrusions will be worn, thereby increasing the probability of the fusion device slipping out and increasing the pain of the patient. Summary of the Invention

[0004] In order to make up for the deficiencies of the prior art, when implanting the intervertebral fusion device, the protruding tooth rod is retracted to keep its surface flat and smooth, which is convenient for the implantation of the intervertebral fusion device and avoids extrusion, friction, and scraping. After that, after implantation, the protruding tooth rod extends to increase the friction between the intervertebral fusion device and the vertebral end plate, ensure good fixation effect and stability of the intervertebral fusion device, and improve the treatment effect. The present invention provides a self-stabilizing cervical intervertebral fusion device.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: A self-stabilizing cervical intervertebral fusion device of the present invention includes a fixing plate and a fusion device main body. The fusion device main body is U-shaped. The fixing plate is installed on the fusion device main body. The area enclosed between the fusion device main 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 fusion device main body includes a transverse part and a longitudinal part, and the fixing plate is installed on the longitudinal part; An adjusting rod is installed inside the main body of the fusion device. An installation groove is formed in the horizontal part, and the adjusting rod passes through the installation groove. A stopper is installed at one end of the adjusting rod away from the fixing plate. A slider is installed in the installation groove, and the stopper drives the slider to move towards the fixing plate. An adjusting hole is formed in the fixing plate, and one end of the adjusting rod away from the horizontal part is inserted into the adjusting hole; An adjusting groove is formed in the vertical part. Connecting plates are symmetrically installed in the adjusting groove in the vertical direction. A toothed rod is installed on the connecting plate, and the other end of the toothed rod extends out of the surface of the main body of the fusion device. A contact plate is installed on the connecting plate. An extrusion groove is formed in the contact plate. A top block is slidably installed in the adjusting groove. The top block and the slider are connected to each other by a pull rope. The top block is located in the extrusion groove and is in contact with the contact plate. The cross section of the top block is triangular.

[0006] Preferably, a thread is provided at the lower end of the toothed rod, and the toothed rod is installed on the connecting plate by the thread.

[0007] Preferably, a cushion plate is installed between the contact plate and the connecting plate. An activity groove is formed on the surface of the cushion plate close to the connecting plate, and the lower end of the toothed rod is aligned with the activity groove; One end of the adjusting groove in the vertical part close to the fixing plate is provided with an opening. The cushion plate is composed of multiple unit plates, and the number of unit plates is increased or decreased from the opening at one end of the adjusting groove close to the fixing plate.

[0008] Preferably, through holes are formed in the activity groove, and bone cement is filled in the activity groove and the through holes.

[0009] Preferably, the toothed rod is inclined relative to the surface of the main body of the fusion device, and the inclination directions of the toothed rods on the two vertical parts of the main body of the fusion device are opposite.

[0010] Preferably, a contact groove is formed on the surface of the main body of the fusion device, and the length direction of the contact groove is parallel to the length direction of the fixing plate; One end of the contact groove close to the bone grafting cavity is provided with an opening, and the other end of the contact groove away from the bone grafting cavity is in a closed state, and the inner wall of the contact groove is roughened.

[0011] Preferably, limiting protrusions are provided on the inner wall of the bone grafting cavity, and the inner wall surface of the bone grafting cavity is roughened.

[0012] Preferably, the adjusting rod is elastic, and the adjusting rod is not inserted into the adjusting hole before driving the slider to move.

[0013] The beneficial effects of the present invention are as follows: 1. The self-stabilizing cervical intervertebral fusion device of the present invention is provided with a protruding tooth rod, a connecting plate, a top block, a pulling rope, and an adjusting rod. During the implantation of the intervertebral fusion device, the protruding tooth rod retracts, making the surface of the fusion device flat and smooth, facilitating the implantation of the fusion device into the intervertebral disc, avoiding extrusion, friction, and scraping between the protruding surface of the fusion device and the vertebral endplate, increasing the pain of the patient. At the same time, after the fusion device is implanted, the adjusting rod is rotated, and the top block is driven by the pulling rope to push out the protruding tooth rod, so that the protruding tooth rod extends and contacts the vertebral endplate, making the fixing effect and stability of the fusion device good, and improving the fusion effect and treatment effect of the fusion device.

[0014] 2. The self-stabilizing cervical intervertebral fusion device of the present invention is provided with a longitudinal part and a protruding tooth rod. By using the opposite inclinations of the protruding tooth rods on the two longitudinal parts and the protruding tooth rod extending only after implantation, the fusion device is further fixed, avoiding the left and right movement of the fusion device in the intervertebral disc, and improving the fixing effect and stability of the fusion device.

[0015] 3. The self-stabilizing cervical intervertebral fusion device of the present invention is provided with a limiting protrusion, so that the filling aggregate pressed and compacted in the bone grafting cavity can be stably fixed, avoiding the dropping or peeling of the filling aggregate during the implantation process and increasing the surgical difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 is a perspective view of the intervertebral fusion device of the present invention; Figure 2 is a perspective view of the main body of the fusion device in the present invention; Figure 3 is a perspective view of the fixing plate in the present invention; Figure 4 is a schematic structural view of the main body of the fusion device in the present invention; Figure 5 is a cross-sectional view of the connecting plate, the cushion plate, the contact plate, and the top block in the present invention; Figure 6 is a schematic structural view of the connecting plate, the cushion plate, and the contact plate in the present invention; Figure 7 is Figure 4 a partial enlarged view of part A in In the figure: fixing plate 1, screw hole 11, adjusting hole 12, elastic arm 13, clamping block 131, screw 14, fusion device main body 2, clamping groove 21, sliding groove 211, installation groove 22, sliding block 221, pulling rope 222, bone grafting cavity 23, contact groove 24, limiting projection 25, developing needle 26, connecting plate 3, tooth-shaped rod 31, contact plate 32, extrusion groove 321, top block 33, cushion plate 34, moving groove 341, through hole 342, adjusting groove 35, adjusting rod 4, stop block 41, longitudinal part V, transverse part H. Specific implementation mode

[0018] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation modes.

[0019] As Figures 1 to 7 shown, the self-stabilizing cervical intervertebral fusion device of the present invention includes a fixing plate 1 and a fusion device main body 2. The fusion device main body 2 is U-shaped. 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 the bone grafting cavity 23. A screw hole 11 is opened on the fixing plate 1, and a screw 14 is installed in the screw hole 11; The fusion device main body 2 includes a transverse part H and a longitudinal part V. The fixing plate 1 is installed on the longitudinal part V; An adjusting rod 4 is installed in the fusion device main body 2. An installation groove 22 is opened in the transverse part H. The adjusting rod 4 passes through the installation groove 22. A stop block 41 is installed at one end of the adjusting rod 4 away from the fixing plate 1. A sliding block 221 is installed in the installation groove 22. The stop block 41 drives the sliding block 221 to move towards the fixing plate 1. An adjusting hole 12 is opened on the fixing plate 1. One end of the adjusting rod 4 away from the transverse part H is inserted into the adjusting hole 12; An adjusting groove 35 is opened in the longitudinal part V. Connecting plates 3 are symmetrically installed in the adjusting groove 35 in the vertical direction. A tooth-shaped rod 31 is installed on the connecting plate 3. The other end of the tooth-shaped rod 31 extends out of the surface of the fusion device main body 2. A contact plate 32 is installed on the connecting plate 3. An extrusion groove 321 is opened on the contact plate 32. A top block 33 is slidably installed in the adjusting groove 35. The top block 33 and the sliding block 221 are connected to each other by a pulling rope 222. The top block 33 is located in the extrusion groove 321. The top block 33 and the contact plate 32 are in contact with each other. The cross section of the top block 33 is triangular; Among them, clamping grooves 21 and sliding grooves 211 are formed on the sides of the main body 2 of the fusion device, that is, on the sides where the two longitudinal parts V are far away from each other. The sliding groove 211 is located between the clamping groove 21 and the fixing plate 1, and the sliding groove 211 is connected to the clamping groove 21. At the same time, symmetrically arranged elastic arms 13 are installed on the fixing plate 1. Clamping blocks 131 are installed on the opposite sides of the two elastic arms 13. When the fixing plate 1 is installed on the main body 2 of the fusion device, the two elastic arms 13 are respectively aligned with the sliding grooves 211 on both sides of the main body 2 of the fusion device, so that the clamping blocks 131 enter the sliding grooves 211. Then, the fixing plate 1 and the main body 2 of the fusion device are moved closer to each other, so that the clamping blocks 131 slide in the sliding grooves 211 and enter the clamping grooves 21, thereby completing the installation between the fixing plate 1 and the main body 2 of the fusion device. At the same time, the adjusting rod 4 is connected to the horizontal part H and the fixing plate 1 by threads. At the same time, a developing needle 26 is installed in the horizontal part H; Before the intervertebral fusion device is installed, a trial mold with an appropriate height and depth is selected according to the height of the patient's intervertebral disc, the size of the gap, and the patient's anatomical shape. The position of the trial mold is tracked and determined by X-ray imaging technology, so that the trial mold can be accurately implanted into the intervertebral space in the correct direction, ensuring that the trial mold is placed tightly and precisely between the end plates. Then, an intervertebral fusion device of a suitable model is selected according to the trial mold, so that the intervertebral fusion device is in close contact with the vertebral end plates, improving the supporting effect on the vertebrae. Then, the graft bone filler is loaded and compacted into the bone grafting cavity 23. Then, the intervertebral fusion device is implanted into the intervertebral disc at the affected part of the patient's cervical vertebra, and the intervertebral fusion device is fixed by screws 14; Before the intervertebral fusion device is installed into the patient's cervical intervertebral disc, the adjusting rod 4 on the intervertebral fusion device is in the initial position. At this time, the stopper 41 on the adjusting rod 4 is close to one end of the installation groove 22 away from the fixing plate 1, so that the connecting slider 221 and the pulling rope 222 of the top block 33 are in a relaxed state, that is, the top block 33 does not squeeze the contact plate 32 and the connecting plate 3, and the top end of the protruding tooth rod 31 has not protruded onto the surface of the main body 2 of the fusion device, making the surface of the main body 2 of the fusion device flat and smooth. Furthermore, during the process of implanting the intervertebral fusion device into the patient's cervical intervertebral disc and fine-tuning the position after implantation, the surface of the intervertebral fusion device is relatively smooth, and there will be no situation of extrusion friction and scraping between the protruding block and the vertebral end plate, reducing the resistance during the process of implanting the intervertebral fusion device into the intervertebral disc, and avoiding problems such as wear of some protruding tips on the intervertebral fusion device, increasing the probability of the fusion device slipping out, and increasing the pain of the patient; Meanwhile, after the intervertebral fusion cage is implanted into the intervertebral disc of the patient's cervical vertebra, the doctor screws the screw 14 into the upper and lower adjacent vertebral bodies of the intervertebral fusion cage from the screw hole 11 on the fixing plate 1 to fix the intervertebral fusion cage. Then, the doctor turns the adjusting rod 4 with a tool, so that the adjusting rod 4 moves towards the direction close to the fixing plate 1 under the action of the thread. During this process, the stopper 41 of the adjusting rod 4 located in the installation groove 22 will move towards the fixing plate 1, and then drive the slider 221 to move together through the stopper 41, so that the slider 221 tightens the pull rope 222 and makes the pull rope 222 enter the installation groove 22; Meanwhile, since the other end of the pull rope 222 is connected to the top block 33, when the pull rope 222 is tightened and pulled, the top block 33 will move away from the fixing plate 1. Since the cross-section of the top block 33 is triangular, when the top block 33 moves, it will exert a squeezing effect on the contact plate 32 and the connecting plate 3, so that the contact plate 32 and the connecting plate 3 symmetrically distributed on the upper and lower sides of the top block 33 are squeezed and move away from each other, and the intermediate gap increases. Thus, the tooth rod 31 installed on the connecting plate 3 extends towards the surface of the fusion cage body 2, so that the tip of the extended tooth rod 31 contacts the vertebral end plate, fully increasing the friction between the intervertebral fusion cage and the vertebral end plate, improving the initial stability and long-term stability after the implantation of the vertebral fusion cage, and avoiding or reducing the movement or slippage of the intervertebral fusion cage, which affects the treatment of the patient's cervical vertebra by the intervertebral fusion cage and the intervertebral fusion effect.

[0020] As an implementation mode of the present invention, the lower end of the tooth rod 31 is provided with a thread, and the tooth rod 31 is installed on the connecting plate 3 through the thread; Since the physical conditions of different patients vary, the shapes of the surfaces of the vertebral endplates within the intervertebral discs to be supported are different, and the surfaces of the vertebral endplates are not very smooth, perfect planes or arc surfaces. There will be tiny uneven areas on the surfaces of the vertebral endplates. Therefore, after the vertebral fusion device is implanted into the intervertebral disc and the protruding tooth rods 31 on the vertebral fusion device extend, since the extending lengths of the protruding tooth rods 31 are the same, there will be situations where the tips of some of the protruding tooth rods 31 do not fully contact the vertebral endplate and the tips of some of the protruding tooth rods 31 contact the vertebral endplate excessively. This affects the fixation and stability effects of the vertebral fusion device within the intervertebral disc, as well as the patient's feeling of the affected area after surgery and increases the patient's pain. In this case, based on the selection of the trial mold before choosing the type of intervertebral fusion device and the tracking of the position of the trial mold by X-ray imaging technology during the trial mold process, the size of the gap between different parts of the intervertebral fusion device and the corresponding vertebral endplate after the intervertebral fusion device is implanted into the intervertebral disc is determined, that is, the distribution of the tiny uneven areas on the vertebral endplate. Thus, before the intervertebral fusion device is implanted into the intervertebral disc, the protruding tooth rods 31 on the intervertebral fusion device are adjusted. Through the threaded connection between the protruding tooth rods 31 and the connecting plate 3, the height of the protruding tooth rods 31 on the connecting rod is adjusted. So that when the top block 33 squeezes and drives the connecting plate 3 to move and the protruding tooth rods 31 fully extend, the lengths of the tips of the protruding tooth rods 31 extending relative to the surface of the fusion device main body 2 are different, ensuring that the length of the tip of the protruding tooth rod 31 extending is equal to the distance between the vertebral endplate and the surface of the fusion device main body 2 at the corresponding position, that is, the tips of the protruding tooth rods 31 fully and moderately contact the surface of the vertebral endplate and the tips of the protruding tooth rods 31 can fully fit the surface of the vertebral endplate, improving the fixation effect and stability of the vertebral fusion device within the intervertebral disc, avoiding insufficient contact between some of the protruding tooth rods 31 and the vertebral endplate, which affects the fixation effect and stability of the vertebral fusion device, or the tips of some of the protruding tooth rods 31 penetrating too deeply into the vertebral endplate, which affects the patient's feeling of the affected area during the initial stage of postoperative healing and increases the patient's pain.

[0021] As an implementation manner of the present invention, a cushion plate 34 is installed between the contact plate 32 and the connecting plate 3. An activity groove 341 is opened on the surface of the cushion plate 34 close to the connecting plate 3, and the lower end of the protruding tooth rod 31 is aligned with the activity groove 341; One end of the adjustment groove 35 within the longitudinal part V close to the fixing plate 1 is provided with an opening. The cushion plate 34 is composed of multiple unit plates, and the number of unit plates of the cushion plate 34 is increased or decreased from the opening at one end of the adjustment groove 35 close to the fixing plate 1; Since a spacer plate 34 is installed between the contact plate 32 and the connecting plate 3, and the spacer plate 34 is composed of multiple unit plates, before the intervertebral fusion device is implanted into the intervertebral disc, the doctor judges the contact depth between the tip of the protrusion rod 31 and the vertebral endplate according to the selection of the trial mold and the measurement and anatomical observation of the intervertebral disc during the trial mold process, that is, the depth of the tip of the protrusion rod 31 inserted into the vertebral endplate, to ensure the fixation effect and stability of the vertebral fusion device, and to avoid the depth of the protrusion rod 31 inserted into the vertebral endplate being too deep, causing secondary injury to the patient. Therefore, after the doctor judges and gives the contact depth between the protrusion rod 31 and the vertebral endplate, the doctor increases or decreases the number of unit plates in the spacer plate 34, so that after the top block 33 completely jacks up the contact plate 32, the spacer plate 34 and the connecting plate 3, the protruding height of the protrusion rod 31 relative to the surface of the fusion device body 2 meets the requirements, ensuring good fixation effect and stability of the vertebral fusion device; At the same time, since the protrusion rod 31 and the connecting rod are connected by threads, and the height of the protrusion rod 31 on the connecting plate 3 needs to be adjusted according to the actual situation of the patient, an activity groove 341 is opened on the surface of the spacer plate 34, so that the lower end of the protrusion rod 31 can enter the activity groove 341, to avoid the lower end of the protrusion rod 31 being abutted by the spacer plate 34 when adjusting the relative height of the protrusion rod 31 on the connecting plate 3, resulting in the height of the protrusion rod 31 being unable to be adjusted or the adjustment not in place, affecting the mutual contact and mutual fixation between the protrusion rod 31 and the vertebral endplate; At the same time, when increasing or decreasing the number of unit plates in the spacer plate 34, the fixing plate 1 has not been installed on the fusion device body 2, and the adjusting rod 4 has not been screwed towards the fixing plate 1. At this time, the pull rope 222 in the fusion device body 2 is in a relaxed state. The staff first uses a tool to pull the top block 33 towards the fixing plate 1 for a certain distance, reducing the acting force of the top block 33 on the contact plate 32, making the contact plate 32 and the connecting plate 3 loose from each other and showing a relatively obvious gap. Then, the staff uses a tool to remove or insert unit plates from the opening of the adjusting groove 35 close to the fixing plate 1 direction, changing the thickness of the spacer plate 34, so that the protruding height of the protrusion rod 31 on the surface of the fusion device body 2 changes, making the contact between the protrusion rod 31 and the vertebral endplate sufficient and the fixation good; At the same time, since the length of the installation groove 22 is fixed, the limit value of the distance that the adjusting rod 4 moves towards the fixing plate 1 is fixed. Therefore, when the adjusting rod 4 drives the top block 33 to jack up the connecting plate 3, the adjustment range of the protruding length of the protrusion rod 31 is relatively small, and it is easy to occur that the actual demand exceeds the adjustment range of the protruding length of the protrusion rod 31 by the adjusting rod 4.

[0022] As an implementation manner of the present invention, through holes 342 are opened in the activity groove 341, and bone cement is filled in the activity groove 341 and the through holes 342; By filling the bone cement in the active slot 341, the spacer plate 34, the connecting plate 3 and the toothed rod 31 are integrated into one body, improving the fixing effect on the toothed rod 31 and preventing the threads between the toothed rod 31 and the connecting plate 3 from being damaged when the toothed rod 31 bears pressure, so as to avoid the displacement or sliding of the toothed rod 31, which affects the fixing and stability effects of the intervertebral fusion device in the intervertebral disc. At the same time, the filled bone cement will enter between each unit plate on the spacer plate 34 and between the spacer plate 34 and the contact plate 32 through the through holes 342, further integrating the spacer plate 34, the contact plate 32 and the connecting plate 3 into one body, preventing the components from being relatively independent and avoiding displacement or deformation when the intervertebral fusion device supports the vertebral body, which affects the stability of the intervertebral fusion device.

[0023] As an embodiment of the present invention, the toothed rod 31 is inclined relative to the surface of the fusion device main body 2, and the inclination directions of the toothed rods 31 on the two longitudinal parts V of the fusion device main body 2 are opposite. Since the inclination directions of the toothed rods 31 on the longitudinal parts V of the fusion device main body 2 are opposite, after the toothed rods 31 extend and contact the vertebral end plate, the toothed rods 31 with opposite inclination directions will further limit and fix the relative position of the vertebral body fusion device in the intervertebral disc, preventing the fusion device main body 2 from shifting in the left-right direction after implantation, improving the stability of the intervertebral fusion device after implantation, and ensuring the fusion effect of the intervertebral fusion device.

[0024] As an embodiment of the present invention, a contact groove 24 is formed on the surface of the fusion device main body 2, and the length direction of the contact groove 24 is parallel to the length direction of the fixing plate 1. An opening is provided at one end of the contact groove 24 close to the bone grafting cavity 23, the other end of the contact groove 24 far from the bone grafting cavity 23 is in a closed state, and the inner wall of the contact groove 24 is roughened. By forming the contact groove 24 on the fusion device main body 2 and the depth of the contact groove 24 is relatively shallow, the surface area of the fusion device main body 2 is increased, so that the relative area between the surface of the fusion device main body 2 and the vertebral end plate is increased. At the same time, since an opening is provided at one end of the contact groove 24 close to the bone grafting cavity 23, during the process of filling and pressing the bone grafting filler into the bone grafting cavity 23, part of the bone grafting aggregate can be pressed and compacted into the contact groove 24, thereby increasing the contact area between the bone grafting material filled in the intervertebral disc and the vertebral end plate, and increasing the contact area between the filled bone grafting material and the position close to the edge in the intervertebral disc, thereby promoting bone creeping growth and improving the fusion effect of the intervertebral fusion device. Meanwhile, a contact groove 24 is formed on the surface of the fusion device body 2 to increase the contact area between the fusion device body 2 and the vertebral endplate, improve the fixation effect and stability effect of the intervertebral fusion device, and one end of the contact groove 24 away from the bone graft cavity 23 is in a closed state, which can intercept and block the filling aggregate entering the contact groove 24 to prevent the filling aggregate from overflowing or falling out of the contact groove 24.

[0025] As an embodiment of the present invention, a limiting protrusion 25 is provided on the inner wall of the bone graft cavity 23, and the surface of the inner wall of the bone graft cavity 23 is roughened. Since the area and volume of the bone graft cavity 23 formed between the fusion device body 2 and the fixing plate 1 are relatively large, after the filling aggregate is pressed and compacted into the bone graft cavity 23, during the implantation and fixation of the intervertebral fusion device, it is easy for the filling aggregate to be not firmly attached in the bone graft cavity 23, resulting in the situation of the filling aggregate falling off or peeling off, increasing the surgical difficulty and affecting the subsequent fusion effect of the intervertebral fusion device. Meanwhile, through the limiting protrusion 25 provided on the inner wall of the bone graft cavity 23 and the roughening treatment of the surface of the inner wall of the bone graft cavity 23, the filling aggregate pressed and compacted into the bone graft cavity 23 can be relatively stably and firmly pressed and filled into the bone graft cavity 23, avoiding the situation of the filling aggregate falling off or peeling off during the implantation of the intervertebral fusion device, ensuring the smooth progress of the surgery and the good fusion effect of the intervertebral fusion device.

[0026] As an embodiment of the present invention, the adjusting rod 4 has elasticity, and the adjusting rod 4 is not inserted into the adjusting hole 12 before driving the slider 221 to move. Before the intervertebral fusion device is implanted into the diseased intervertebral disc on the patient's cervical vertebra and the adjusting rod 4 starts to move, the adjusting rod 4 has not entered the adjusting hole 12, that is, the adjusting hole 12 is in communication with the bone graft cavity 23. Therefore, when the intervertebral fusion device has been implanted into the intervertebral disc and the tooth-shaped rod 31 has not been lifted, the filling aggregate is injected into the bone graft cavity 23 again through the adjusting hole 12 to further fill the gap between the intervertebral fusion device and the vertebral endplate, increase the contact area between the filling aggregate and the vertebral endplate, improve the fusion effect of the vertebral fusion device, ensure good treatment effect. At the same time, after the filling aggregate is pressed and compacted into the bone graft cavity 23, a groove is formed in the filling aggregate in the bone graft cavity 23 by a tool, so that when the filling aggregate is injected into the bone graft cavity 23 again from the adjusting hole 12 later, the filling aggregate can spread and fill the gap between the intervertebral fusion device and the vertebral endplate smoothly. After that, after the filling aggregate is injected again, the staff uses a tool to twist the adjusting rod 4, so that the end of the adjusting rod 4 facing the fixing plate 1 is screwed into the adjusting hole 12 in a spiral manner, so that the tooth-shaped rod 31 extends out from the surface of the fusion device body 2, ensuring good fixation effect and stability of the vertebral fusion device.

[0027] The specific working process is as follows: A clamping groove 21, a sliding groove 211 are formed on the side surface of the fusion device main body 2, and the sliding groove 211 is connected to the clamping groove 21. At the same time, symmetrically arranged elastic arms 13 are installed on the fixing plate 1, and clamping blocks 131 are installed on the opposite side surfaces of the two elastic arms 13. The fixing plate 1 and the fusion device main body 2 are moved closer to each other, so that the clamping blocks 131 slide in the sliding groove 211 and enter the clamping groove 21, completing the installation between the fixing plate 1 and the fusion device main body 2. At the same time, the adjusting rod 4 is connected to the horizontal part H and the fixing plate 1 by threads. At the same time, a developing needle 26 is installed in the horizontal part H; Before installing the intervertebral fusion device, select a trial mold with an appropriate height and depth according to the height of the patient's intervertebral disc, the size of the gap and the patient's anatomical shape. Select an intervertebral fusion device of a suitable model according to the trial mold. Then, load and compact the graft bone filler into the bone grafting cavity 23. Then, implant the intervertebral fusion device into the intervertebral disc at the affected part of the patient's cervical vertebra, and fix the intervertebral fusion device with screws 14; Before the intervertebral fusion device is installed into the patient's cervical intervertebral disc, the adjusting rod 4 on the intervertebral fusion device is in the initial position. At this time, the stop block 41 on the adjusting rod 4 is close to one end of the installation groove 22 away from the fixing plate 1, so that the connecting slider 221 and the pulling rope 222 of the top block 33 are in a relaxed state, that is, the top block 33 does not squeeze the contact plate 32 and the connecting plate 3, and the top end of the protruding tooth rod 31 has not protruded onto the surface of the fusion device main body 2, making the surface of the fusion device main body 2 flat and smooth; After the intervertebral fusion device is implanted into the intervertebral disc of the patient's cervical vertebra, the doctor screws the screw 14 into the adjacent upper and lower vertebral bodies of the intervertebral fusion device from the screw hole 11 on the fixing plate 1 to fix the intervertebral fusion device. Then, the doctor uses a tool to twist the adjusting rod 4, so that the adjusting rod 4 moves in the direction close to the fixing plate 1 under the action of the thread. During this process, the stop block 41 of the adjusting rod 4 located in the installation groove 22 will move in the direction of the fixing plate 1, and then drive the slider 221 to move together through the stop block 41, so that the slider 221 tightens the pulling rope 222 and makes the pulling rope 222 enter the installation groove 22; At the same time, since the other end of the pulling rope 222 is connected to the top block 33, when the pulling rope 222 is tightened and pulled, the top block 33 will move in the direction away from the fixing plate 1. Since the cross-section of the top block 33 is triangular, when the top block 33 moves, it will exert a squeezing effect on the contact plate 32 and the connecting plate 3, so that the contact plate 32 and the connecting plate 3 symmetrically distributed on the upper and lower sides of the top block 33 are squeezed and move away from each other, and the middle gap increases, so that the protruding tooth rod 31 installed on the connecting plate 3 extends towards the surface of the fusion device main body 2, so that the tip of the protruding tooth rod 31 in contact with the vertebral end plate; It is determined according to the selection of the trial mold before choosing the intervertebral fusion cage model and the tracking of the trial mold position by X-ray imaging technology during the trial mold process. Thus, after the intervertebral fusion cage is implanted into the intervertebral disc, the gap sizes between different parts of the intervertebral fusion cage and the corresponding vertebral endplates are determined, that is, the distribution of the tiny uneven areas on the vertebral endplates. Before the intervertebral fusion cage is implanted into the intervertebral disc, adjust the height of the tooth rod 31 on the connecting rod. When the tooth rod 31 fully extends, the lengths of the tips of the tooth rod 31 protruding relative to the surface of the fusion cage body 2 are different, ensuring that the length of the tip of the tooth rod 31 protruding is equal to the distance between the vertebral endplate and the surface of the fusion cage body 2 at the corresponding position, that is, the tip of the tooth rod 31 fully and moderately contacts the surface of the vertebral endplate and the tip of the tooth rod 31 can fully fit the surface of the vertebral endplate; After the doctor judges and gives the contact depth between the tooth rod 31 and the vertebral endplate, the doctor increases or decreases the number of unit plates in the spacer plate 34. After the top block 33 fully jacks up the contact plate 32, the spacer plate 34 and the connecting plate 3, the protruding height of the tooth rod 31 relative to the surface of the fusion cage body 2 meets the requirements; An activity groove 341 is opened on the surface of the spacer plate 34 so that the lower end of the tooth rod 31 can enter the activity groove 341, preventing the lower end of the tooth rod 31 from being abutted by the spacer plate 34 when adjusting the relative height of the tooth rod 31 on the connecting plate 3, resulting in the inability to adjust the height of the tooth rod 31 or the adjustment not being in place; At the same time, when increasing or decreasing the number of unit plates in the spacer plate 34, the fixing plate 1 has not been installed on the fusion cage body 2 and the adjusting rod 4 has not been screwed towards the fixing plate 1. At this time, the pull rope 222 in the fusion cage body 2 is in a relaxed state. The staff first uses a tool to pull the top block 33 towards the fixing plate 1 for a certain distance to reduce the acting force of the top block 33 on the contact plate 32, making the contact plate 32 and the connecting plate 3 loose from each other and showing a relatively obvious gap. Then, use a tool to remove or insert a unit plate from the opening of the adjusting groove 35 close to the fixing plate 1 direction to change the thickness of the spacer plate 34; By filling bone cement in the activity groove 341, the spacer plate 34, the connecting plate 3 and the tooth rod 31 are made into a whole; At the same time, the filled bone cement will enter between the various unit plates on the spacer plate 34 and between the spacer plate 34 and the contact plate 32 through the through holes 342, further making the spacer plate 34, the contact plate 32 and the connecting plate 3 into a whole; Since the inclination directions of the tooth rods 31 on the longitudinal part V of the fusion cage body 2 are opposite, after the tooth rods 31 extend and contact the vertebral endplate, the tooth rods 31 with opposite inclination directions will further limit and fix the relative position of the vertebral fusion cage in the intervertebral disc, preventing the fusion cage body 2 from shifting in the left-right direction after implantation; By providing a contact groove 24 on the main body 2 of the fusion device, and the depth of the contact groove 24 is relatively shallow, the relative area between the surface of the main body 2 of the fusion device and the vertebral endplate is increased. At the same time, since the contact groove 24 is provided with an opening at one end close to the bone graft cavity 23, during the process of filling and pressing the bone graft filler into the bone graft cavity 23, part of the bone graft aggregate can be pressed and compacted into the contact groove 24, increasing the contact area between the bone graft filler in the intervertebral disc and the vertebral endplate, and increasing the contact area between the bone graft filler and the position near the edge in the intervertebral disc, promoting bone creeping growth and improving the fusion effect of the intervertebral fusion device; At the same time, a contact groove 24 is provided on the surface of the main body 2 of the fusion device to increase the contact area between the main body 2 of the fusion device and the vertebral endplate; At the same time, by providing a limiting projection 25 on the inner wall of the bone graft cavity 23 and roughening the surface of the inner wall of the bone graft cavity 23, the bone graft filler pressed and compacted into the bone graft cavity 23 can be relatively stably and firmly pressed and filled into the bone graft cavity 23, avoiding the situation of the bone graft filler falling off or peeling off during the implantation of the intervertebral fusion device; When the intervertebral fusion device has been implanted into the intervertebral disc and the protruding tooth rod 31 has not been lifted, the bone graft filler is injected into the bone graft cavity 23 again through the adjustment hole 12, so that the bone graft filler further fills the gap between the intervertebral fusion device and the vertebral endplate, increasing the contact area between the bone graft filler and the vertebral endplate. At the same time, after the bone graft filler is pressed and compacted into the bone graft cavity 23, a groove is formed in the bone graft filler in the bone graft cavity 23 by a tool, so that when the bone graft filler is injected into the bone graft cavity 23 again from the adjustment hole 12 later, the bone graft filler can spread and fill the gap between the intervertebral fusion device and the vertebral endplate smoothly. After that, after the bone graft filler is injected again, the staff uses a tool to twist the adjustment rod 4, so that the adjustment rod 4 is screwed into the adjustment hole 12 towards the end of the fixing plate 1, and the protruding tooth rod 31 extends out from the surface of the main body 2 of the fusion device.

[0028] 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. What is described in the above embodiments and the specification only illustrates 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. A self-stabilizing cervical intervertebral fusion device, comprising a fixing plate (1) and a fusion device body (2). The fusion device body (2) is U-shaped, the fixing plate (1) is installed on the fusion device body (2), and the area enclosed between the fusion device body (2) and the fixing plate (1) is a bone grafting cavity (23). A screw hole (11) is provided on the fixing plate (1), and a screw (14) is installed in the screw hole (11). It is characterized in that: The fusion device body (2) includes a transverse part (H) and a longitudinal part (V), and the fixing plate (1) is installed on the longitudinal part (V). An adjusting rod (4) is installed in the fusion device body (2). An installation groove (22) is provided in the transverse part (H), the adjusting rod (4) passes through the installation groove (22), a stop block (41) is installed at one end of the adjusting rod (4) away from the fixing plate (1), a slider (221) is installed in the installation groove (22), the stop block (41) drives the slider (221) to move towards the fixing plate (1), an adjusting hole (12) is provided on the fixing plate (1), and one end of the adjusting rod (4) away from the transverse part (H) is inserted into the adjusting hole (12). An adjusting groove (35) is provided in the longitudinal part (V). Connecting plates (3) are symmetrically installed vertically in the adjusting groove (35). A protruding tooth rod (31) is installed on the connecting plate (3), and the other end of the protruding tooth rod (31) extends out of the surface of the fusion device body (2). A contact plate (32) is installed on the connecting plate (3), and an extrusion groove (321) is provided on the contact plate (32). A top block (33) is slidably installed in the adjusting groove (35), and the top block (33) and the slider (221) are connected to each other by a pull rope (222). The top block (33) is located in the extrusion groove (321), the top block (33) and the contact plate (32) are in contact with each other, and the cross section of the top block (33) is triangular.

2. The self-stabilizing cervical interbody fusion device according to claim 1, wherein: The lower end of the protruding tooth rod (31) is provided with threads, and the protruding tooth rod (31) is installed on the connecting plate (3) through the threads.

3. The self-stabilizing cervical interbody fusion device according to claim 2, wherein: A cushion plate (34) is installed between the contact plate (32) and the connecting plate (3). An activity groove (341) is provided on the surface of the cushion plate (34) close to the connecting plate (3), and the lower end of the protruding tooth rod (31) is aligned with the activity groove (341). One end of the adjusting groove (35) in the longitudinal part (V) close to the fixing plate (1) is provided with an opening. The cushion plate (34) is composed of multiple unit plates, and the number of unit plates is increased or decreased from the opening at one end of the adjusting groove (35) close to the fixing plate (1).

4. The self-stabilizing cervical interbody fusion device according to claim 3, wherein: A through hole (342) is provided in the activity groove (341), and bone cement is filled in the activity groove (341) and the through hole (342).

5. The self-stabilizing cervical interbody fusion device according to claim 1, wherein: The protruding tooth rod (31) is inclined relative to the surface of the fusion device body (2), and the inclination directions of the protruding tooth rods (31) on the two longitudinal parts (V) of the fusion device body (2) are opposite.

6. The self-stabilizing cervical interbody fusion device according to claim 1, wherein: A contact groove (24) is formed on the surface of the fuser body (2), and the length direction of the contact groove (24) is parallel to the length direction of the fixing plate (1); An opening is provided at one end of the contact groove (24) close to the bone grafting cavity (23), and the other end of the contact groove (24) far from the bone grafting cavity (23) is in a closed state, and the inner wall of the contact groove (24) is roughened.

7. The self-stabilizing cervical interbody fusion device according to claim 6, wherein: A limiting protrusion (25) is arranged on the inner wall of the bone grafting cavity (23), and the inner wall surface of the bone grafting cavity (23) is roughened.

8. The self-stabilizing cervical interbody fusion device according to claim 7, wherein: The adjusting rod (4) is elastic, and the adjusting rod (4) is not inserted into the adjusting hole (12) before driving the slider (221) to move.

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