A scissors-type intervertebral fusion device

Abstract

The present invention belongs to the technical field of medical devices, and specifically relates to a scissor-type intervertebral fusion device, which includes a base and an upper support plate. The base and the upper support plate are interconnected by a scissor-type jacking mechanism. The base and the upper support plate are provided with protruding teeth. The scissor-type jacking mechanism includes a jacking block, a shaft rod, an arched top plate, a movable block and a push rod. The movable block is installed on the bottom surface inside the base, and the arched top plate is located between the movable block and the inner wall of the base. The upper end of the arched top plate is interconnected with the upper support plate. The structure of the present invention is simple. By combining the arched top plate and the movable block into a relatively flat scissor-type structure, the size of the fusion device is further reduced, which is convenient for the implantation and thickness adjustment of the fusion device. At the same time, the degrees of freedom of the movable components in the fusion device are reduced and restricted, ensuring the stability of the fusion device after the thickness adjustment.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and specifically relates to a scissor-type intervertebral fusion device. Background Art

[0002] In daily life, cases of vertebral body damage caused by tumors, fractures, infections, etc. occur from time to time. When treating these patients, a fusion device is implanted between the damaged vertebral bodies to enable bone tissue to undergo creeping substitution, thereby repairing the damaged vertebral bodies. However, the height of traditional vertebral fusion devices is fixed, while the intervertebral height of the human body varies from person to person. Therefore, during surgery, it is impossible to adjust the height of the vertebral fusion device to adapt to the intervertebral height of different patients, which affects the treatment versatility and applicability.

[0003] Most existing intervertebral fusion devices mostly need to be equipped with a support device, a bone material filling device in the support device, and a self-locking device to prevent the support device from falling off. Among them, the self-locking device is mostly a self-locking claw. At the same time, the flexibility of existing adjustable fusion devices is relatively high, with multiple movable inclined planes, and it is easy to deform and displace during the later rehabilitation process, affecting the postoperative rehabilitation of patients. In addition, the size of existing fusion devices is relatively small, and the size of the adjustment mechanism included in the fusion device is also limited, resulting in a small adjustment operation space and relatively difficult adjustment operations for the fusion device in specific surgeries. Summary of the Invention

[0004] In order to make up for the deficiencies of the prior art, a relatively flat scissor structure is formed by combining an arched top plate and a movable block, further reducing the size of the fusion device, facilitating the implantation and thickness adjustment of the fusion device. At the same time, the degrees of freedom of the movable components in the fusion device are reduced and restricted to ensure the stability of the fusion device after thickness adjustment. The present invention proposes a scissor-type intervertebral fusion device.

[0005] The technical solution adopted by the present invention to solve its technical problems is: The present invention relates to a scissor-type intervertebral fusion device, which includes a base and an upper support plate. A scissor-type jacking mechanism is installed inside the base, and the upper support plate is connected to the upper end of the scissor-type jacking mechanism. Protruding teeth are provided on the lower surface of the base and the upper surface of the upper support plate, and through holes are provided on the base and the upper support plate;

[0006] A chute is provided on the bottom surface inside the base, a movable block is installed in the chute, a push rod is rotatably installed on the movable block, and the end of the push rod away from the movable block passes through the outer surface of the base;

[0007] An arched top plate is installed on the inner wall of the base. An inclined surface groove is provided on the side surface of the movable block, and the end of the arched top plate away from the inner wall of the base is inserted into the inclined surface groove. Multiple groups of arched top plates are provided;

[0008] A jacking block is installed on the lower surface of the upper support plate. A shaft rod is installed on the jacking block. The arched top plate passes through the gap between the shaft rod and the jacking block. A limiting block is installed on the jacking block. A limiting groove is formed on the inner wall of the base. The limiting block and the limiting groove are mutually matched;

[0009] The scissor jacking mechanism includes a jacking block, a shaft rod, an arched top plate, a movable block and a push rod.

[0010] Preferably, the movable block is located at the middle position inside the base. The arched top plates are evenly arranged along the length direction of the base. The arched top plates are symmetrically arranged on both sides of the movable block.

[0011] Preferably, fixing grooves are formed on the inner wall of the base. One ends of the arched top plates close to the inner wall of the base are all installed on fixing plates. The fixing plates are installed in the fixing grooves.

[0012] Preferably, an installation groove is formed on the side surface of the limiting block. A locking plate is installed in the installation groove. One end of the locking plate away from the base is fixed in the installation groove. One end of the locking plate close to the base is upturned and abuts against the inner wall of the limiting groove. The area on the inner wall of the limiting groove in contact with the locking plate is provided with evenly distributed protrusions.

[0013] Preferably, a shielding plate is installed on the surfaces of the base and the upper support plate through a connecting plate. The protruding teeth are located below the shielding plate;

[0014] The hardness of the protruding teeth is greater than that of the shielding plate.

[0015] Preferably, a weakening groove is formed on the lower surface of the shielding plate. The tip of the protruding tooth is in contact with the bottom surface of the weakening groove.

[0016] Preferably, an arc-shaped groove is formed on the surface of the connecting plate. The arc-shaped groove is located on the side surface of the connecting plate away from the protruding teeth.

[0017] Preferably, a connecting hole is formed in the push rod. An injection hole is formed in the movable block. The connecting hole and the injection hole are communicated with each other.

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

[0019] 1. The present invention relates to a scissors-type intervertebral fusion device. By providing a jacking block, a shaft rod, an arched top plate, a movable block, an inclined groove, and a push rod, a relatively flat scissors structure is formed, making the height and size of the scissors-type jacking mechanism in the fusion device relatively small, thereby further reducing the size of the fusion device, facilitating the implantation and use of the fusion device. At the same time, the scissors structure is used to conveniently adjust the height of the fusion device and reduce the degree of freedom of the movable components in the fusion device. With the cooperation of the locking plate, the stability after the thickness adjustment of the fusion device is ensured, and the situations of deformation, displacement, and slippage of the fusion device are avoided.

[0020] 2. The present invention relates to a scissors-type intervertebral fusion device. By providing a shielding plate, a connecting plate, a weak groove, a through hole, and an injection hole, before the fusion device is used, the protruding teeth are shielded by the shielding plate, making the surface of the fusion device relatively smooth, facilitating the implantation of the fusion device into the patient's body, and avoiding the scraping and friction between the protruding teeth on the fusion device and the vertebral end plate, and between the protruding teeth and the surgical incision, which affect the fixation of the fusion device between the vertebrae and increase the patient's pain. Brief Description of the Drawings

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is the front view of the fusion device of the present invention;

[0023] Figure 2 is the partial cross-sectional view of the fusion device of the present invention;

[0024] Figure 3 is the schematic structural view of the protruding teeth on the fusion device of the present invention;

[0025] Figure 4 is the schematic structural view of the shielding plate in the fusion device of the present invention;

[0026] Figure 5 is the schematic structural view of the base in the fusion device of the present invention;

[0027] Figure 6 is the schematic structural view of the upper support plate in the fusion device of the present invention;

[0028] Figure 7 is the schematic structural view of the arched top plate in the fusion device of the present invention;

[0029] Figure 8 is the schematic structural view of the movable block in the fusion device of the present invention;

[0030] Figure 9 is the schematic view of the position of the movable block and the arched top plate in the fusion device of the present invention;

[0031] Figure 10 is Figure 2 the partial enlarged view at A in

[0032] Figure 11 is Figure 2 Partial enlarged view at position B in

[0033] Figure 12 is Figure 2 Partial enlarged view at position C in

[0034] Figure 13 is Figure 6 Partial enlarged view at position D in

[0035] In the figure: base 1, chute 11, limit groove 12, fixing groove 13, upper support plate 2, lifting block 21, shaft rod 211, limit block 22, installation groove 221, locking plate 222, movable block 3, push rod 31, inclined plane groove 32, injection hole 33, arched top plate 4, fixing plate 41, protruding teeth 5, shielding plate 51, connecting plate 511, weak groove 512, through hole 6. Specific embodiments

[0036] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0037] As Figures 1 to 13 shown, a scissor-type intervertebral fusion device of the present invention includes a base 1 and an upper support plate 2. A scissor-type lifting mechanism is installed in the base 1, and the upper support plate 2 is connected to the upper end of the scissor-type lifting mechanism. Protruding teeth 5 are provided on the lower surface of the base 1 and the upper surface of the upper support plate 2, and through holes 6 are provided in the base 1 and the upper support plate 2;

[0038] A chute 11 is provided on the bottom surface inside the base 1, a movable block 3 is installed in the chute 11, a push rod 31 is rotatably installed on the movable block 3, and one end of the push rod 31 away from the movable block 3 passes through the outer surface of the base 1;

[0039] An arched top plate 4 is installed on the inner wall of the base 1. An inclined plane groove 32 is provided on the side surface of the movable block 3. One end of the arched top plate 4 away from the inner wall of the base 1 is inserted into the inclined plane groove 32, and multiple groups of arched top plates 4 are provided;

[0040] A lifting block 21 is installed on the lower surface of the upper support plate 2. A shaft rod 211 is installed on the lifting block 21. The arched top plate 4 passes through the gap between the shaft rod 211 and the lifting block 21. A limit block 22 is installed on the lifting block 21, and a limit groove 12 is provided on the inner wall of the base 1. The limit block 22 and the limit groove 12 match each other;

[0041] The scissor-type lifting mechanism includes a lifting block 21, a shaft rod 211, an arched top plate 4, a movable block 3 and a push rod 31;

[0042] After the fusion device is implanted into the patient's body, the doctor turns the push rod 31 on the base 1 with a special tool. Under the action of the thread, the push rod 31 moves into the base 1. Then, the push rod 31 pushes the movable block 3 to move in the chute 11. At the same time, since one end of the arched top plate 4 is inserted into the inclined groove 32, when the movable block 3 moves, it will squeeze the arched top plate 4. During this process, the arched top plate 4, the movable block 3 and the jacking block 21 are combined to form a scissor structure. After the two ends of the arched top plate 4 are squeezed and approach each other, the highest point on the arched top plate 4, that is, the contact point between the arched top plate 4 and the shaft rod 211 on the jacking block 21, will further rise, thereby driving the upper support plate 2 to gradually rise, increasing the height of the fusion device, being able to adapt to the intervertebral height of different patients, and having a good treatment effect;

[0043] At the same time, a shaft rod 211 is installed on the jacking block 21, forming a gap between the shaft rod 211 and the jacking block 21. Furthermore, the arched top plate 4 can pass through the gap. While ensuring that the arched top plate 4 is pressed and deformed upward, it can also fully fix and limit the jacking block 21 through the arched top plate 4. At the same time, through the mutual matching between the limit block 22 and the limit groove 12, the degrees of freedom of the jacking block 21 and the upper support plate 2 during the adjustment of the height of the fusion device can be further reduced, ensuring the stability of the fusion device during the later rehabilitation process of the patient, and avoiding situations such as deformation and displacement of the fusion device, which may affect the postoperative rehabilitation of the patient;

[0044] At the same time, due to the combination of the extrusion of the movable plate on the arched top plate 4 and the connection between the arched top plate 4 and the jacking plate to form a scissor structure, when the scissor jacking mechanism inside the fusion device does not adjust the height of the fusion device, the size of the scissor jacking mechanism is relatively small. Furthermore, the overall size of the fusion device is relatively reduced, facilitating the doctor to implant the fusion device into the patient's body;

[0045] Meanwhile, due to the height limitation of the patient's intervertebral space, the height of the arched top plate 4 after being pressed and lifted can meet the requirement of adjusting the height of the fusion device. That is to say, the scissor lifting mechanism using the arched top plate 4 can be equivalently replaced by the scissor structure composed of multiple connecting rods in the prior art, such as the patent with the application number CN201921108172.5 and the name of Scissor-Type Intervertebral Fusion Device, in terms of height adjustment. At the same time, the scissor lifting mechanism using the arched top plate 4 has relatively fewer components than the scissor structure composed of multiple connecting rods, and the arched structure of the arched top plate 4 has a relatively high structural stability in terms of force dispersion. Moreover, there is no need to reserve a part of the space below for the scissor lifting mechanism to deform when adjusting the height, so that the height of the space in the base 1 can be used as much as possible to adjust the height of the fusion device, reducing the height of the fusion device when it is not in use, facilitating the use of the fusion device and improving the applicability of the fusion device. At the same time, multiple groups of arched top plates 4 are provided, so that there are multiple force application points when the upper support plate 2 rises, ensuring that the upper support plate 2 is horizontal and stable, and avoiding the situation that the connection points of the scissor structure composed of multiple connecting rods and the top plate are all located in the middle of the top plate, which is prone to skew and deviation.

[0046] As an embodiment of the present invention, the movable block 3 is located at the middle position inside the base 1, and the arched top plates 4 are uniformly arranged along the length direction of the base 1, and the arched top plates 4 are symmetrically arranged on both sides of the movable block 3;

[0047] Since the arched top plates 4 are symmetrically arranged on both sides of the movable block 3, when the movable block 3 moves and drives the arched top plates 4 to lift upward, the upward acting forces received by the upper support plate 2 are evenly distributed, making the lifting action of the upper support plate 2 stable and avoiding the situation of sliding and skew of the upper support plate 2 when the height of the fusion device is adjusted. At the same time, since multiple groups of arched top plates 4 are provided and the arched top plates 4 are symmetrically arranged, there are relatively more and evenly distributed fulcrums between the upper support plate 2 and the arched top plates 4, further ensuring that the upper support plate 2 is horizontal and stable during movement and ensuring good applicability and treatment effect of the fusion device.

[0048] As an embodiment of the present invention, fixing grooves 13 are formed on the inner wall of the base 1, and one ends of the arched top plates 4 close to the inner wall of the base 1 are all installed on fixing plates 41, and the fixing plates 41 are installed in the fixing grooves 13;

[0049] Since there are multiple groups of arched top plates 4, one end of each arched top plate 4 is installed on the fixed plate 41, so that all the arched top plates 4 on the same side of the movable plate form a whole, thereby ensuring the stability of the position and structure of the arched top plates 4 in the base 1, and avoiding the situation that the arched top plates 4 are skewed, offset or misaligned due to external vibration and shaking before the height of the fusion device is adjusted and when the arched top plates 4 are not squeezed, which affects the normal use and treatment effect of the fusion device. At the same time, since the arched top plates 4 form a whole through the fixed plate 41, it is also convenient for the staff to install the arched top plates 4 during the assembly of the fusion device, improving the assembly efficiency.

[0050] As an embodiment of the present invention, an installation groove 221 is formed on the side surface of the limit block 22, a locking plate 222 is installed in the installation groove 221, one end of the locking plate 222 away from the base 1 is fixed in the installation groove 221, one end of the locking plate 222 close to the base 1 is upturned and abuts against the inner wall of the limit groove 12, and convex blocks are evenly distributed in the area where the inner wall of the limit groove 12 contacts the locking plate 222;

[0051] Since one end of the locking plate 222 away from the base 1 is fixed in the installation groove 221 and one end of the locking plate 222 close to the base 1 is in a free state, the lower end of the locking plate 222 will closely adhere to the inner wall of the limit groove 12 under its own elastic action. Thus, when the limit block 22 moves upward along with the lifting block 21 and the upper support plate 2, the lower end of the locking plate 222 can move upward along the inner wall of the limit groove 12 by passing over the convex blocks under the elastic action, ensuring that the limit block 22 can move upward stably and smoothly. At the same time, after the height of the fusion device is adjusted, when the upper support plate 2 is subjected to a downward pressure, the lower end of the locking plate 222 will be stuck on the convex blocks on the inner wall of the limit groove 12, thereby preventing the locking plate 222, the limit block 22 and the lifting block 21 from moving downward, that is, locking the downward movement of the fusion device, so as to ensure the stable support of the fusion device for the upper and lower vertebral bodies and avoid problems such as loosening, deformation and displacement of the fusion device.

[0052] As an embodiment of the present invention, a shielding plate 51 is installed on the surfaces of the base 1 and the upper support plate 2 through a connecting plate 511, and the protruding teeth 5 are located below the shielding plate 51;

[0053] The hardness of the protruding teeth 5 is greater than that of the shielding plate 51;

[0054] By installing a shielding plate 51 on the base 1 and the upper support plate 2, the shielding plate 51 shields the protruding teeth 5 on the surface of the fusion device, so that when the fusion device is implanted into the patient's body or adjusted in position between the vertebral bodies after implantation, the surface of the fusion device is relatively smooth, facilitating the implantation and use of the fusion device, and avoiding the friction and interference between the protruding teeth 5 on the fusion device and the surgical incision on the patient's body and the vertebral endplate, thereby reducing the wear of the protruding teeth 5 on the surface of the fusion device and reducing the pain of the patient;

[0055] Meanwhile, after the fusion device is implanted into the patient's body and the position adjustment is completed, the doctor adjusts the scissor jacking mechanism in the fusion device to gradually raise the upper support plate 2 to complete the height adjustment of the fusion device, so that the height of the fusion device adapts to the intervertebral height of the patient, improving the applicability and treatment effect of the fusion device. At the same time, since the hardness of the protruding teeth 5 is greater than that of the shielding plate 51, when the upper support plate 2 is gradually raised, the tip of the protruding teeth 5 will squeeze and pierce through the shielding plate 51, and then the protruding teeth 5 will abut against the vertebral endplate, thereby ensuring the fixation effect of the fusion device between the vertebral bodies and preventing the fusion device from slipping out or shifting after installation, which affects the postoperative rehabilitation effect of the patient.

[0056] As an embodiment of the present invention, a weakening groove 512 is formed on the lower surface of the shielding plate 51, and the tip of the protruding tooth 5 is in contact with the bottom surface of the weakening groove 512;

[0057] By forming the weakening groove 512 on the shielding plate 51, the thickness at the contact portion between the shielding plate 51 and the protruding tooth 5 is reduced. Combining with the fact that the hardness of the protruding tooth 5 is greater than that of the shielding plate 51, it is convenient for the protruding tooth 5 to pierce through the shielding plate 51, avoiding damage to the tip of the protruding tooth 5 due to extrusion by the shielding plate 51 and affecting the fixation effect of the fusion device between the intervertebral spaces.

[0058] As an embodiment of the present invention, an arc-shaped groove is formed on the surface of the connecting plate 511, and the arc-shaped groove is located on the side surface of the connecting plate 511 away from the protruding tooth 5;

[0059] Forming the arc-shaped groove on the connecting plate 511 makes it easier for the connecting plate 511 to deform and bend when the shielding plate 51 is squeezed and the protruding tooth 5 pierces through the shielding plate 51, further facilitating the protruding tooth 5 to penetrate through the shielding plate 51 and avoiding the large strength of the connecting plate 511 resulting in difficulty for the protruding tooth 5 to pass through the shielding plate 51 or damage to the tip of the protruding tooth 5 during the piercing process;

[0060] Meanwhile, since the arc-shaped groove is located on the side surface of the connecting plate 511 away from the protruding tooth 5, when the shielding plate 51 is pressed and the connecting plate 511 deforms, the connecting plate 511 is prone to bend towards the direction of the protruding tooth 5, avoiding the connecting plate 511 bending and protruding away from the fusion device and causing additional damage to the patient.

[0061] As an embodiment of the present invention, a connection hole is provided in the push rod 31, and an injection hole 33 is provided in the movable block 3. The connection hole is in communication with the injection hole 33;

[0062] After the height of the fusion device is adjusted, the doctor uses a tool to inject the filled aggregate into the fusion device through the connection hole in the push rod 31, so that the aggregate enters the injection hole 33 and fills the space in the fusion device. After that, the aggregate that fills the space in the fusion device overflows again from the through hole 6 in the fusion device, so that the aggregate fills the space between the upper and lower vertebral bodies, facilitating bone fusion between the upper and lower vertebral bodies.

[0063] The specific working process is as follows:

[0064] After the fusion device is implanted into the patient's body, the doctor twists the push rod 31 on the base 1 through a special tool. The push rod 31 moves into the base 1 under the action of the thread. After that, the push rod 31 will push the movable block 3 to move in the chute 11. At the same time, since one end of the arched top plate 4 is inserted into the inclined surface groove 32, the movable block 3 will exert extrusion on the arched top plate 4 when it moves. During this process, the arched top plate 4, the movable block 3 and the jacking block 21 are combined to form a scissor structure. After the two ends of the arched top plate 4 are squeezed and approach each other, the highest point on the arched top plate 4, that is, the contact point between the arched top plate 4 and the shaft rod 211 on the jacking block 21 will further rise, thereby driving the upper support plate 2 to gradually rise and increasing the height of the fusion device;

[0065] At the same time, a shaft rod 211 is installed on the jacking block 21, so that a gap is formed between the shaft rod 211 and the jacking block 21, enabling the arched top plate 4 to pass through the gap, fully fixing and limiting the jacking block 21, and at the same time reducing the degrees of freedom of the jacking block 21 and the upper support plate 2 when adjusting the height of the fusion device;

[0066] At the same time, due to the extrusion of the movable plate on the arched top plate 4 and the connection between the arched top plate 4 and the jacking plate to form a scissor structure, the size of the scissor jacking mechanism inside the fusion device is relatively small when the height of the fusion device is not adjusted, and thus the overall size of the fusion device is relatively reduced;

[0067] Meanwhile, due to the height limitation of the patient's intervertebral space, the height of the arched top plate 4 after being pressed and lifted can meet the requirement of adjusting the height of the fusion device. That is to say, the scissor lifting mechanism applying the arched top plate 4 can equivalently replace the scissor structure composed of multiple connecting rods used in the prior art, such as the patent with the application number CN201921108172.5 and the name "Scissor-Type Intervertebral Fusion Device" in terms of height adjustment. At the same time, the scissor lifting mechanism applying the arched top plate 4 has relatively fewer components compared to the scissor structure composed of multiple connecting rods. The arched structure of the arched top plate 4 has a relatively high structural stability with a dispersed force. And there is no need to reserve a part of the space below for the scissor lifting mechanism to deform when adjusting the height, so that the height of the space inside the base 1 can be used as much as possible to adjust the height of the fusion device, reducing the height of the fusion device when not in use. At the same time, multiple groups of arched top plates 4 are provided, so that there will be multiple force points when the upper support plate 2 rises, ensuring the horizontal and stable state of the upper support plate 2;

[0068] Since the arched top plates 4 are symmetrically arranged on both sides of the movable block 3, the upward acting forces received by the upper support plate 2 are evenly distributed, making the rising action of the upper support plate 2 stable. At the same time, due to the provision of multiple groups of arched top plates 4 and the symmetrical arrangement of the arched top plates 4, there are relatively more and evenly distributed fulcrums between the upper support plate 2 and the arched top plates 4, further ensuring the horizontal and stable state of the upper support plate 2 during movement;

[0069] Since multiple groups of arched top plates 4 are provided, one end of each arched top plate 4 is installed on the fixed plate 41, making all the arched top plates 4 on the same side of the movable plate form a whole, thus ensuring the stability of the position and structure of the arched top plates 4 inside the base 1. At the same time, since the arched top plates 4 become a whole through the fixed plate 41, it is also convenient for the staff to install the arched top plates 4 when assembling the fusion device;

[0070] Since one end of the locking plate 222 away from the base 1 is fixed in the installation groove 221 and the end of the locking plate 222 close to the base 1 is in a free state, the lower end of the locking plate 222 will closely adhere to the inner wall of the limiting groove 12 under its own elastic force. When the limiting block 22 moves upward with the lifting block 21 and the upper support plate 2, the lower end of the locking plate 222 can move upward along the inner wall of the limiting groove 12 by passing over the convex block under the elastic force. At the same time, after the height of the fusion device is adjusted, when the upper support plate 2 is subjected to a downward pressure, the lower end of the locking plate 222 will be stuck on the convex block on the inner wall of the limiting groove 12, thereby preventing the locking plate 222, the limiting block 22 and the lifting block 21 from moving downward, that is, locking the downward movement of the fusion device;

[0071] By installing a shielding plate 51 on the base 1 and the upper support plate 2, the shielding plate 51 shields the protruding teeth 5 on the surface of the fusion device, so that when the fusion device is implanted into the patient's body or adjusted in position between the vertebral bodies after implantation, the surface of the fusion device is relatively smooth, which is convenient for the implantation and use of the fusion device, and avoids the friction and interference between the protruding teeth 5 on the fusion device and the surgical incision on the patient's body and the vertebral end plate;

[0072] At the same time, after the fusion device is implanted into the patient's body and the position adjustment is completed, the doctor adjusts the scissor jacking mechanism in the fusion device to gradually raise the upper support plate 2. Since the hardness of the protruding teeth 5 is greater than that of the shielding plate 51, when the upper support plate 2 is gradually raised, the tip of the protruding teeth 5 will squeeze and pierce through the shielding plate 51, and then, the protruding teeth 5 will abut against the vertebral end plate;

[0073] By providing a weakening groove 512 on the shielding plate 51 to reduce the thickness at the contact between the shielding plate 51 and the protruding teeth 5, and in combination with the fact that the hardness of the protruding teeth 5 is greater than that of the shielding plate 51, it is convenient for the protruding teeth 5 to pierce through the shielding plate 51;

[0074] By providing an arc-shaped groove on the connecting plate 511, when the shielding plate 51 is squeezed and the protruding teeth 5 pierce through the shielding plate 51, the connecting plate 511 is less difficult to deform and bend, which is convenient for the protruding teeth 5 to penetrate through the shielding plate 51;

[0075] At the same time, since the arc-shaped groove is located on the side of the connecting plate 511 away from the protruding teeth 5, when the shielding plate 51 is pressed and the connecting plate 511 deforms, the connecting plate 511 is prone to bend towards the direction of the protruding teeth 5;

[0076] After the height of the fusion device is adjusted, the doctor injects the filled aggregate into the fusion device through the connection hole on the push rod 31 with a tool, so that the aggregate enters the injection hole 33 and fills the space inside the fusion device. After that, the aggregate that fills the space inside the fusion device overflows again from the through hole 6 on the fusion device, so that the aggregate fills the space between the upper and lower vertebral bodies, which is convenient for bone fusion between the upper and lower vertebral bodies.

[0077] 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 scissor-type intervertebral fusion device, comprising a base (1) and an upper support plate (2). A scissor-type jacking mechanism is installed inside the base (1), and the upper support plate (2) is connected to the upper end of the scissor-type jacking mechanism. Protruding teeth (5) are provided on the lower surface of the base (1) and the upper surface of the upper support plate (2), and through holes (6) are provided on the base (1) and the upper support plate (2). It is characterized in that: A sliding groove (11) is provided on the bottom surface inside the base (1), a movable block (3) is installed in the sliding groove (11), a push rod (31) is rotatably installed on the movable block (3), and one end of the push rod (31) far from the movable block (3) penetrates through the outer surface of the base (1). An arched top plate (4) is installed on the inner wall of the base (1). An inclined groove (32) is provided on the side surface of the movable block (3), and one end of the arched top plate (4) far from the inner wall of the base (1) is inserted into the inclined groove (32). Multiple groups of the arched top plates (4) are provided. A jacking block (21) is installed on the lower surface of the upper support plate (2), a shaft rod (211) is installed on the jacking block (21), the arched top plate (4) passes through the gap between the shaft rod (211) and the jacking block (21), a limiting block (22) is installed on the jacking block (21), a limiting groove (12) is provided on the inner wall of the base (1), and the limiting block (22) and the limiting groove (12) are mutually matched. The scissor-type jacking mechanism includes a jacking block (21), a shaft rod (211), an arched top plate (4), a movable block (3) and a push rod (31). An installation groove (221) is provided on the side surface of the limiting block (22), a locking plate (222) is installed in the installation groove (221), one end of the locking plate (222) far from the base (1) is fixed in the installation groove (221), one end of the locking plate (222) close to the base (1) is upturned and abuts against the inner wall of the limiting groove (12), and convex blocks are uniformly arranged in the area where the inner wall of the limiting groove (12) contacts the locking plate (222).

2. The scissors type intervertebral fusion device according to claim 1, characterized in that: The movable block (3) is located at the middle position inside the base (1), the arched top plates (4) are uniformly arranged along the length direction of the base (1), and the arched top plates (4) are symmetrically arranged on both sides of the movable block (3).

3. The scissors-type intervertebral fusion device according to claim 1, characterized in that: A fixing groove (13) is provided on the inner wall of the base (1), and one end of each arched top plate (4) close to the inner wall of the base (1) is installed on a fixing plate (41), and the fixing plate (41) is installed in the fixing groove (13).

4. The scissors-type intervertebral fusion device according to claim 1, wherein: A shielding plate (51) is installed on the surfaces of the base (1) and the upper support plate (2) through a connecting plate (511), and the protruding teeth (5) are located on the side of the shielding plate (51) close to the base (1) and the upper support plate (2). The hardness of the protruding teeth (5) is greater than the hardness of the shielding plate (51).

5. The scissors-type intervertebral fusion device according to claim 4, characterized in that: Weakening grooves (512) are provided on the side surface of the shielding plate (51) close to the base (1) and the upper support plate (2), and the tip of the protruding tooth (5) is in contact with the bottom surface of the weakening groove (512).

6. The scissors-type intervertebral fusion device according to claim 4, wherein: An arc-shaped groove is formed on the surface of the connecting plate (511), and the arc-shaped groove is located on the side of the connecting plate (511) away from the protruding teeth (5).

7. The scissors-type intervertebral fusion device according to claim 1, characterized in that: A connecting hole is formed in the push rod (31), and an injection hole (33) is formed in the movable block (3). The connecting hole communicates with the injection hole (33).

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