A self-stabilizing cervical interbody fusion device

Abstract

The present invention belongs to the technical field of medical implant prostheses, and specifically relates to a self-stabilizing cervical intervertebral fusion device, which includes a fixing plate and a fusion device main body; an adjusting rod is installed in the fusion device main body, an installation groove is formed in the fusion device main body, the adjusting rod and a slider are installed in the installation groove, a stopper is installed on the adjusting rod, and the stopper drives the slider to move; an adjusting groove is installed in the fusion device main 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 the top block and the slider are connected to each other by a pulling rope; when the intervertebral fusion device is implanted in the present invention, the protruding tooth rod retracts to keep its surface flat and smooth, facilitating the implantation of the intervertebral fusion device and avoiding 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, ensuring good fixing effect and stability of the intervertebral fusion device and improving the treatment effect.

Description

Technical Field

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

[0002] Cervical spondylosis is a common orthopedic disease. Currently, it is often treated by implanting 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, thereby maintaining the normal height and physiological curvature of the cervical spine sequence, achieving 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 patient's anatomical morphology, position the trial mold correctly along the correct cephalocaudal 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 by X-ray imaging technology to ensure that after the segment is fully expanded, the trial mold is placed tightly and precisely 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 occur 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 surrounded by 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;

[0006] The fusion device main body includes a transverse part and a longitudinal part, and the fixing plate is installed on the longitudinal part;

[0007] 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 stop block is installed at one end of the adjusting rod away from the fixed plate. A slider is installed in the installation groove, and the stop block drives the slider to move towards the fixed plate. An adjusting hole is formed in the fixed plate, and one end of the adjusting rod away from the horizontal part is inserted into the adjusting hole;

[0008] An adjusting groove is formed in the vertical part. Connecting plates are symmetrically installed in the adjusting groove in the vertical direction. A protruding tooth rod is installed on the connecting plate, and the other end of the protruding tooth 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 is connected to the slider by a pulling 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.

[0009] Preferably, a thread is provided at the lower end of the protruding tooth rod, and the protruding tooth rod is installed on the connecting plate by the thread.

[0010] 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 protruding tooth rod is aligned with the activity groove;

[0011] An opening is provided at one end of the adjusting groove in the vertical part close to the fixed plate. 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 fixed plate.

[0012] Preferably, through holes are formed in the activity groove, and bone cement is filled in the activity groove and the through holes.

[0013] Preferably, the protruding tooth rod is inclined relative to the surface of the main body of the fusion device, and the inclination directions of the protruding tooth rods on the two vertical parts of the main body of the fusion device are opposite.

[0014] 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 fixed plate;

[0015] An opening is provided at one end of the contact groove close to the bone grafting cavity, and the other end of the contact groove away from the bone grafting cavity is in a closed state. The inner wall of the contact groove is roughened.

[0016] Preferably, a limiting protrusion is provided on the inner wall of the bone grafting cavity, and the inner wall surface of the bone grafting cavity is roughened.

[0017] Preferably, the adjusting rod is elastic, and the adjusting rod is not inserted into the adjusting hole before driving the slider to move.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. For the self-stabilizing cervical intervertebral fusion device of the present invention, by providing a protruding tooth rod, a connecting plate, a top block, a pulling rope, and an adjusting rod, during the implantation process 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 convex 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 out 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.

[0020] 2. For the self-stabilizing cervical intervertebral fusion device of the present invention, by providing a longitudinal part and a protruding tooth rod, and utilizing the opposite inclinations of the protruding tooth rods on the two longitudinal parts and the fact that the protruding tooth rods only extend out 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.

[0021] 3. For the self-stabilizing cervical intervertebral fusion device of the present invention, by providing a limiting protrusion, the filling aggregate pressure-mounted and compacted in the bone grafting cavity can be stably fixed, avoiding the dropping or peeling off of the filling aggregate during the implantation process and increasing the surgical difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 is a perspective view of the intervertebral fusion device of the present invention;

[0024] Figure 2 is a perspective view of the main body of the fusion device in the present invention;

[0025] Figure 3 is a perspective view of the fixing plate in the present invention;

[0026] Figure 4 is a schematic structural view of the main body of the fusion device in the present invention;

[0027] 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;

[0028] Figure 6 is a schematic structural view of the connecting plate, the cushion plate, and the contact plate in the present invention;

[0029] Figure 7 is Figure 4 a partial enlarged view of part A in

[0030] 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, slider 221, pull 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, vertical part V, horizontal part H. Detailed implementation mode

[0031] 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 the specific implementation modes.

[0032] As Figures 1 to 7 shown, a 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 surrounded by the fusion device main body 2 and the fixing plate 1 is a 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;

[0033] The fusion device main body 2 includes a horizontal part H and a vertical part V. The fixing plate 1 is installed on the vertical part V;

[0034] An adjusting rod 4 is installed in the fusion device main body 2. An installation groove 22 is opened in the horizontal 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 opened on the fixing plate 1. One end of the adjusting rod 4 away from the horizontal part H is inserted into the adjusting hole 12;

[0035] An adjusting groove 35 is opened in the vertical part V. Connecting plates 3 are symmetrically installed in the vertical direction in the adjusting groove 35. 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 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. The cross section of the top block 33 is triangular;

[0036] Wherein, clamping grooves 21 and sliding grooves 211 are formed on the sides of the main body 2 of the fusion device, i.e., 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, and 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;

[0037] 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 gap size 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 tightly and precisely placed 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 plate, improving the supporting effect on the vertebra. Then, the bone graft filler is loaded and compacted into the bone graft 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;

[0038] 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 mounting groove 22 away from the fixing plate 1, so that the pull rope 222 connecting the sliding block 221 and the top block 33 is in a relaxed state, that is, the top block 33 does not press against 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. Thus, 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;

[0039] 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 vertebral bodies adjacent to 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, and under the action of the thread, the adjusting rod 4 moves towards the direction close to the fixing plate 1. During this process, the block 41 located in the installation groove 22 of the adjusting rod 4 will move towards the fixing plate 1, and then drive the slider 221 to move together through the block 41, so that the slider 221 tightens the pulling rope 222 and makes the pulling rope 222 enter the installation groove 22;

[0040] Meanwhile, 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 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 comes into contact with 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.

[0041] As an embodiment of the present invention, a thread is provided at the lower end of the tooth rod 31, and the tooth rod 31 is installed on the connecting plate 3 through the thread;

[0042] Due to the different physical conditions of different patients, 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 out, 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 to drive 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 out 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 tip of the protruding tooth rod 31 fully and moderately contacts the surface of the vertebral endplate and the tip of the protruding tooth rod 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 the situation where some of the protruding tooth rods 31 do not contact the vertebral endplate sufficiently, affecting the fixation effect and stability of the vertebral fusion device, or the situation where the tips of some of the protruding tooth rods 31 penetrate too deep into the vertebral endplate, affecting the patient's feeling of the affected area in the initial stage of postoperative healing and increasing the patient's pain.

[0043] 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;

[0044] One end of the adjustment groove 35 within the longitudinal part V close to the fixed 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 fixed plate 1;

[0045] 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 end plate 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 insertion of the tip of the protrusion rod 31 into the vertebral end plate, so as to ensure the fixation effect and stability of the vertebral fusion device, and to avoid the depth of insertion of the protrusion rod 31 into the vertebral end plate being too deep, causing secondary harm to the patient. Therefore, after the doctor judges and gives the contact depth between the protrusion rod 31 and the vertebral end plate, 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 protrusion 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;

[0046] 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, avoiding that when adjusting the relative height of the protrusion rod 31 on the connecting plate 3, the lower end of the protrusion rod 31 is abutted by the spacer plate 34, resulting in the height of the protrusion rod 31 being unable to be adjusted or not adjusted in place, affecting the mutual contact and fixation between the protrusion rod 31 and the vertebral end plate;

[0047] 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 protrusion 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 end plate sufficient and the fixation good;

[0048] At the same time, since the length of the installation groove 22 is fixed, the limit value of the moving distance of the adjusting rod 4 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 protrusion 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 protrusion length of the protrusion rod 31 by the adjusting rod 4.

[0049] As an implementation mode of the present invention, a through hole 342 is opened in the movable slot 341, and bone cement is filled in the movable slot 341 and the through hole 342;

[0050] By filling the bone cement in the movable slot 341, the cushion plate 34, the connecting plate 3 and the protruding tooth rod 31 are integrated into a whole, improving the fixing effect on the protruding tooth rod 31, and avoiding the damage of the thread between the protruding tooth rod 31 and the connecting plate 3 when the protruding tooth rod 31 bears pressure, so that the protruding tooth rod 31 is displaced or slides, affecting the fixing and stability effects of the intervertebral fusion device in the intervertebral disc;

[0051] At the same time, the filled bone cement will enter between each unit plate on the cushion plate 34 and between the cushion plate 34 and the contact plate 32 through the through hole 342, further integrating the cushion plate 34, the contact plate 32 and the connecting plate 3 into a whole, avoiding the relative independence of each component, and preventing displacement or deformation when the intervertebral fusion device supports the vertebral body, affecting the stability of the intervertebral fusion device.

[0052] As an implementation mode of the present invention, the surface of the protruding tooth rod 31 is inclined relative to the fusion device main body 2, and the inclination directions of the protruding tooth rods 31 on the two longitudinal parts V of the fusion device main body 2 are opposite;

[0053] Since the inclination directions of the protruding tooth rods 31 on the longitudinal part V of the fusion device main body 2 are opposite, after the protruding tooth rods 31 extend out and contact the vertebral end plate, the protruding tooth rods 31 with opposite inclination directions will further limit and fix the relative position of the vertebral body fusion device in the intervertebral disc, avoiding the displacement of the fusion device main body 2 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.

[0054] As an implementation mode of the present invention, a contact groove 24 is opened 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;

[0055] 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;

[0056] By forming a contact groove 24 in the main body 2 of the fusion device, with the contact groove 24 having a relatively shallow depth, the surface area of the main body 2 of the fusion device is increased, so that 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 one end of the contact groove 24 close to the bone graft cavity 23 is provided with an opening, during the process of filling and press-fitting the bone graft filler into the bone graft cavity 23, part of the bone graft aggregate can be press-fitted and compacted into the contact groove 24, thereby increasing the contact area between the filled aggregate in the intervertebral disc and the vertebral endplate, and increasing the contact area between the filled aggregate and the position close to the edge in the intervertebral disc, so as to promote the creeping growth of bone and improve the fusion effect of the intervertebral fusion device;

[0057] At the same time, a contact groove 24 is formed 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, improve the fixation effect and stability effect of the intervertebral fusion device, and one end of the contact groove 24 far from the bone graft cavity 23 is in a closed state, which can intercept and block the filled aggregate entering the contact groove 24 to prevent the filled aggregate from overflowing or falling out of the contact groove 24.

[0058] 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;

[0059] Since the area and volume of the bone graft cavity 23 formed by the main body 2 of the fusion device and the fixing plate 1 are relatively large, after the filled aggregate is press-fitted and compacted into the bone graft cavity 23, during the implantation and fixation of the intervertebral fusion device, it is easy for the filled aggregate to be not firmly attached in the bone graft cavity 23, resulting in the situation of the filled aggregate falling off or peeling off, increasing the surgical difficulty and affecting the subsequent fusion effect of the intervertebral fusion device;

[0060] At the same time, 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 filled aggregate press-fitted and compacted into the bone graft cavity 23 can be relatively stably and firmly press-fitted and filled into the bone graft cavity 23, avoiding the situation of the filled aggregate falling off or peeling off during the implantation of the intervertebral fusion device, ensuring the smooth progress of the operation and the good fusion effect of the intervertebral fusion device.

[0061] 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;

[0062] Before the intervertebral fusion cage is implanted into the diseased intervertebral disc of 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 communicates with the bone grafting cavity 23. Therefore, when the intervertebral fusion cage has been implanted into the intervertebral disc and the protruding tooth rod 31 has not been lifted, the filling aggregate is injected into the bone grafting cavity 23 again through the adjusting hole 12, so that the filling aggregate further fills the gap between the intervertebral fusion cage and the vertebral end plate, increases the contact area between the filling aggregate and the vertebral end plate, improves the fusion effect of the vertebral fusion cage, and ensures good treatment effect. At the same time, after the filling aggregate is pressed and compacted into the bone grafting cavity 23, grooves are opened on the filling aggregate in the bone grafting cavity 23 by tools, so that when the filling aggregate is injected into the bone grafting cavity 23 again from the adjusting hole 12 later, the filling aggregate can spread smoothly and fill the gap between the intervertebral fusion cage and the vertebral end plate. After that, after the filling aggregate is injected again, the staff uses tools to twist the adjusting rod 4, so that the adjusting rod 4 is screwed into the adjusting hole 12 towards the end of the fixing plate 1 in a spiral manner, so that the protruding tooth rod 31 extends out from the surface of the fusion cage body 2, ensuring good fixing effect and stability of the vertebral fusion cage.

[0063] The specific working process is as follows:

[0064] A clamping groove 21, a sliding groove 211 are formed on the side surface of the fusion cage body 2, and the sliding groove 211 is connected to the clamping groove 21. At the same time, elastic arms 13 are symmetrically arranged on the fixing plate 1, and clamping blocks 131 are arranged on the opposite side surfaces of the two elastic arms 13. The fixing plate 1 and the fusion cage 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 cage body 2. At the same time, the adjusting rod 4 is connected to the horizontal part H and the fixing plate 1 by threads, and a developing needle 26 is installed in the horizontal part H;

[0065] Before installing the intervertebral fusion cage, 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. An appropriate model of the intervertebral fusion cage is selected according to the trial mold. Then, the bone grafting filler is loaded and compacted into the bone grafting cavity 23. Then, the intervertebral fusion cage is implanted into the intervertebral disc at the diseased part of the patient's cervical vertebra, and the intervertebral fusion cage is fixed by screws 14;

[0066] Before the intervertebral fusion cage is installed into the patient's cervical intervertebral disc, the adjusting rod 4 on the intervertebral fusion cage is in the initial position. At this time, the stop block 41 on the adjusting rod 4 is close to the end of the installation groove 22 away from the fixing plate 1, so that the pull rope 222 connecting the sliding block 221 and the top block 33 is in a relaxed state, that is, the top block 33 does not press 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 cage body 2, making the surface of the fusion cage body 2 flat and smooth;

[0067] 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 upper and lower adjacent 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 turns the adjusting rod 4 with a tool, and under the action of the thread, the adjusting rod 4 moves towards the direction close to the fixing plate 1. During this process, the block 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 block 41, so that the slider 221 tightens the pull rope 222 and makes the pull rope 222 enter the installation groove 22;

[0068] At the same time, 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 middle gap increases, so that the protruding tooth rod 31 installed on the connecting plate 3 extends towards the surface of the fusion device body 2, and the tip of the protruding tooth rod 31 that extends makes contact with the vertebral end plate;

[0069] According to the selection of the test mold before selecting the model of the intervertebral fusion device and the tracking of the position of the test mold by X-ray imaging technology during the test mold process, it is determined that after the intervertebral fusion device is implanted into the intervertebral disc, the gap size between different parts of the intervertebral fusion device and the corresponding vertebral end plate, that is, the distribution of the tiny uneven areas on the vertebral end plate. Before the intervertebral fusion device is implanted into the intervertebral disc, adjust the height of the protruding tooth rod 31 on the connecting rod so that when the protruding tooth rod 31 fully extends, the length of the tip of the protruding tooth rod 31 extending relative to the surface of the fusion device body 2 is different, ensuring that the length of the tip of the protruding tooth rod 31 extending is equal to the distance between the vertebral end plate and the surface of the fusion device body 2 at the corresponding position, that is, the tip of the protruding tooth rod 31 fully and moderately contacts the surface of the vertebral end plate and the tip of the protruding tooth rod 31 can fully fit the surface of the vertebral end plate;

[0070] After the doctor judges and gives the contact depth between the protruding tooth rod 31 and the vertebral end plate, 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 extending height of the protruding tooth rod 31 relative to the surface of the fusion device body 2 meets the requirements;

[0071] An activity groove 341 is opened on the surface of the spacer plate 34, so that the lower end of the protruding tooth rod 31 can enter the activity groove 341, avoiding that when adjusting the relative height of the protruding tooth rod 31 on the connecting plate 3, the lower end of the protruding tooth rod 31 is abutted by the spacer plate 34, resulting in the height of the protruding tooth rod 31 being unable to be adjusted or the adjustment not in place;

[0072] Meanwhile, 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 main body 2 yet, and the adjusting rod 4 has not been screwed towards the fixing plate 1. At this time, the pulling rope 222 inside the fusion device main body 2 is in a slack state. First, the staff 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, use a tool to remove or insert a unit plate from the opening of the adjusting groove 35 near the fixing plate 1 direction to change the thickness of the spacer plate 34;

[0073] Through the bone cement filled in the movable groove 341, the spacer plate 34, the connecting plate 3 and the protruding tooth rod 31 are integrated into a whole;

[0074] Meanwhile, 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 a whole;

[0075] Since the inclination directions of the protruding tooth rods 31 on the longitudinal part V of the fusion device main body 2 are opposite, after the protruding tooth rods 31 extend and contact the vertebral end plate, the protruding tooth rods 31 with opposite inclination directions will further limit and fix the relative position of the vertebral fusion device in the intervertebral disc, preventing the fusion device main body 2 from shifting in the left - right direction after implantation;

[0076] By opening the contact groove 24 on the fusion device main body 2 and the depth of the contact groove 24 is relatively shallow, 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 one end of the contact groove 24 close to the bone grafting cavity 23 is provided with an opening, during the process of filling and pressing the graft bone filler into the bone grafting cavity 23, part of the graft bone aggregate can be pressed and compacted into the contact groove 24, increasing the contact area between the filled aggregate in the intervertebral disc and the vertebral end plate, and increasing the contact area between the filled aggregate and the position near the edge in the intervertebral disc, promoting bone ingrowth and improving the fusion effect of the intervertebral fusion device;

[0077] Meanwhile, by opening the contact groove 24 on the surface of the fusion device main body 2, the contact area between the fusion device main body 2 and the vertebral end plate is increased;

[0078] Meanwhile, through the limiting protrusions 25 provided on the inner wall of the bone grafting cavity 23 and rough - processing the surface of the inner wall of the bone grafting cavity 23, the filled bone aggregate pressed and compacted into the bone grafting cavity 23 can be relatively stably and firmly pressed and filled into the bone grafting cavity 23, preventing the situation that the filled bone aggregate drops or peels off during the implantation of the intervertebral fusion device;

[0079] When the intervertebral fusion cage has been implanted into the intervertebral disc and the protruding tooth rod 31 has not been lifted yet, the filling aggregate is injected into the bone graft cavity 23 again through the adjustment hole 12, so that the filling aggregate further fills the gap between the intervertebral fusion cage and the vertebral endplate, increasing the contact area between the filling aggregate and the vertebral endplate. At the same time, after the filling aggregate is pressed and compacted into the bone graft cavity 23, grooves are formed on the filling aggregate in the bone graft cavity 23 by means of a tool, so that when the filling aggregate is injected into the bone graft cavity 23 again from the adjustment hole 12 later, the filling aggregate can spread and fill the gap between the intervertebral fusion cage and the vertebral endplate smoothly. After that, after the filling aggregate is injected again, the staff uses a tool to turn the adjusting rod 4, so that the end of the adjusting rod 4 facing the fixing plate 1 is screwed into the adjustment hole 12 in a spiral manner, and the protruding tooth rod 31 extends out from the surface of the fusion cage body 2.

[0080] 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 the present invention claimed 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 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 a bone grafting cavity (23). A screw hole (11) is formed in the fixing plate (1), and a screw (14) is installed in the screw hole (11). It is characterized in that: The fusion device main 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 main body (2). An installation groove (22) is formed 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 formed in 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 formed in the longitudinal part (V). Connecting plates (3) are symmetrically installed in the vertical direction in the adjusting groove (35). A toothed rod (31) is installed on the connecting plate (3). The other end of the toothed 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 formed in the contact plate (32). A top block (33) is slidably installed in the adjusting groove (35). 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), and the top block (33) is in contact with the contact plate (32). The cross section of the top block (33) is triangular. The adjusting rod (4) is connected to the transverse part H and the fixing plate (1) by threads. When the adjusting rod (4) is in the initial position, the top end of the toothed rod (31) has not protruded onto the surface of the fusion device main body (2). By turning the adjusting rod (4), the adjusting rod (4) moves towards the fixing plate (1) under the action of the threads. During this process, the stop block (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 stop block (41), so that the slider (221) tightens the pull rope (222) and the pull rope (222) enters the installation groove (22). When the pull rope (222) is tightened and pulled, the top block (33) will move away from the fixing plate (1). When the top block (33) moves, the contact plates (32) and the connecting plates (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, so that the toothed rod (31) installed on the connecting plate (3) extends towards the surface of the fusion device main body (2).

2. The self-stabilizing cervical intervertebral fusion device according to claim 1, characterized in that: The lower end of the tooth-shaped rod (31) is provided with threads, and the tooth-shaped 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 formed on the surface of the cushion plate (34) close to the connecting plate (3), and the lower end of the tooth-shaped rod (31) is aligned with the activity groove (341); One end of the adjustment groove (35) in the longitudinal portion (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).

4. The self-stabilizing cervical interbody fusion device according to claim 3, characterized in that: A through hole (342) is formed 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 tooth-shaped rod (31) is inclined relative to the surface of the fusion device main body (2), and the inclination directions of the tooth-shaped rods (31) on the two longitudinal portions (V) of the fusion device main body (2) are opposite.

6. The self-stabilizing cervical interbody fusion device according to claim 1, characterized in that: 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); One end of the contact groove (24) close to the bone grafting cavity (23) is provided with an opening, the 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 intervertebral fusion device according to claim 6, characterized in that: A limiting protrusion (25) is provided 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 intervertebral fusion device according to claim 7, wherein: 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.

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