Scissor type interbody fusion cage

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a scissor type interbody fusion cage which comprises a base and an upper supporting plate, the base is connected with the upper supporting plate through a scissor type jacking mechanism, and protruding teeth are arranged on the base and the upper supporting plate; the shear type jacking mechanism comprises a jacking block, a shaft rod, an arched top plate, a movable block and a push rod; a movable block is installed on the bottom face in 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 connected with the upper supporting plate; the fusion cage is simple in structure, the arched top plate and the movable block are combined into a relatively flat scissor type structure, the size of the fusion cage is further reduced, the fusion cage can be conveniently implanted and used, the thickness can be conveniently adjusted, meanwhile, the freedom degree of movable parts in the fusion cage is reduced and limited, and the stability of the fusion cage after the thickness is adjusted is guaranteed.

Description

Technical Field

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

[0002] In daily life, cases of vertebral damage due to tumors, fractures, infections, etc. occur from time to time. When treating these patients, a fusion device is implanted between the damaged vertebrae to allow bone tissue to creep and replace, thereby repairing the damaged vertebrae. However, the height of traditional vertebral fusion devices is fixed, while the intervertebral height of the human body varies from person to person. Therefore, the height of the vertebral fusion device cannot be adjusted during surgery to adapt to the intervertebral height of different patients, affecting the versatility and applicability of treatment.

[0003] Most of the existing intervertebral fusion devices need to be equipped with supporting equipment, bone material filling equipment in the supporting equipment and self-locking equipment to prevent the supporting equipment from falling off, among which the self-locking devices are mostly self-locking claws. At the same time, the existing adjustable fusion devices are relatively flexible and have multiple active inclined surfaces, which are prone to deformation and displacement in the later rehabilitation process, affecting the patient's postoperative rehabilitation. In addition, the size of the existing fusion devices is relatively small, and the size of the adjustment mechanism contained in the fusion device is also limited, which makes the adjustment operation space of the fusion device in a specific operation small and the adjustment operation relatively difficult. Summary of the invention

[0004] In order to make up for the shortcomings of the existing technology, the present invention proposes a scissors-type intervertebral fusion device by combining an arched top plate and a movable block into a relatively flat scissors-type structure, further reducing the size of the fusion device, facilitating the implantation and use of the fusion device and adjusting the thickness. At the same time, the freedom of the movable parts in the fusion device is reduced and restricted to ensure the stability of the fusion device after the thickness is adjusted.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: the scissor-type intervertebral fusion device described in the present invention comprises a base and an upper support plate, a scissor-type lifting mechanism is installed in the base, the upper support plate is connected to the upper end of the scissor-type lifting mechanism, protruding teeth are arranged on the lower surface of the base and the upper surface of the upper support plate, and through holes are opened on the base and the upper support plate; A slide groove is provided on the bottom surface of the base, a movable block is installed in the slide groove, a push rod is rotatably installed on the movable block, and one end of the push rod away from the movable block passes through the outer surface of the base; An arched top plate is installed on the inner wall of the base, an inclined groove is opened on the side of the movable block, and one end of the arched top plate away from the inner wall of the base is inserted into the inclined groove, and the arched top plate is provided in multiple groups; A lifting block is installed on the lower surface of the upper support plate, a shaft is installed on the lifting block, the arched top plate passes through the gap between the shaft and the lifting block, a limit block is installed on the lifting block, a limit groove is provided on the inner wall of the base, and the limit block and the limit groove match each other; The scissor-type lifting mechanism comprises a lifting block, a shaft rod, an arched top plate, a movable block and a push rod.

[0006] Preferably, the movable block is located in the middle of the base, the arched top plates are evenly arranged along the length direction of the base, and the arched top plates are symmetrically arranged on both sides of the movable block.

[0007] Preferably, a fixing groove is provided on the inner wall of the base, and one end of the arched top plate close to the inner wall of the base is mounted on a fixing plate, and the fixing plate is mounted in the fixing groove.

[0008] Preferably, an installation groove is opened on the side of the limit block, and a locking plate is installed in the installation groove. The end of the locking plate away from the base is fixed in the installation groove, and the end of the locking plate close to the base is tilted and abuts against the inner wall of the limit groove. The area on the inner wall of the limit groove that contacts the locking plate is provided with evenly distributed protrusions.

[0009] Preferably, a shielding plate is installed on the surface of the base and the upper support plate through a connecting plate, and the protruding teeth are located below the shielding plate; The hardness of the protruding teeth is greater than the hardness of the shielding plate.

[0010] Preferably, a weakening groove is provided on the lower surface of the shielding plate, and the tip of the protruding tooth contacts the bottom surface of the weakening groove.

[0011] Preferably, an arc-shaped groove is provided on the surface of the connecting plate, and the arc-shaped groove is located on the side of the connecting plate away from the protruding teeth.

[0012] Preferably, a connecting hole is provided in the push rod, an injection hole is provided on the movable block, and the connecting hole and the injection hole are communicated with each other.

[0013] The beneficial effects of the present invention are as follows: 1. The scissors-type intervertebral fusion device described in the present invention is composed of a lifting block, a shaft, an arched top plate, a movable block, a bevel groove and a push rod to form a relatively flat scissors-type structure, so that the height and size of the scissors-type lifting mechanism in the fusion device are relatively small, thereby further reducing the size of the fusion device and facilitating the implantation and use of the fusion device. At the same time, the scissors-type structure is used to facilitate the adjustment of the height of the fusion device and reduce the degree of freedom of the movable parts in the fusion device. The locking plate is used to ensure the stability of the fusion device after the thickness is adjusted, thereby avoiding deformation, displacement and slippage of the fusion device.

[0014] 2. The scissors-type intervertebral fusion device described in the present invention, by providing a baffle plate, a connecting plate, a weak groove, a through hole and an injection hole, utilizes the baffle plate to cover the protruding teeth before the fusion device is used, so that the surface of the fusion device is relatively smooth, which facilitates the implantation of the fusion device into the patient's body and avoids the protruding teeth on the fusion device from scraping and rubbing against the vertebral end plate, the protruding teeth and the surgical incision, which affects the fixation of the fusion device between the vertebrae and increases the patient's pain. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 1 is a front view of the fusion device of the present invention; Figure 2 is a partial cross-sectional view of the fusion device of the present invention; Figure 3 It is a schematic diagram of the structure of the protruding teeth on the fusion device of the present invention; Figure 4 It is a schematic diagram of the structure of the shielding plate in the fusion device of the present invention; Figure 5 It is a structural schematic diagram of a base in the fusion device of the present invention; Figure 6 It is a schematic structural diagram of an upper support plate in a fusion device of the present invention; Figure 7 It is a structural schematic diagram of the arched top plate in the fusion device of the present invention; Figure 8 It is a schematic diagram of the structure of the movable block in the fusion device of the present invention; Fig. 9 It is a schematic diagram of the positions of the movable block and the arched top plate in the fusion device of the present invention; Fig.10 yes Figure 2 A partial enlarged view of the middle part; Fig.11 yes Figure 2 A partial enlarged view of point B in the middle; Fig.12 yes Figure 2 A partial enlarged view of point C in the middle; Fig.13 yes Figure 6 A partial enlarged view of point D in the middle; In the figure: base 1, slide groove 11, limit groove 12, fixing groove 13, upper support plate 2, lifting block 21, shaft 211, limit block 22, mounting groove 221, locking plate 222, movable block 3, push rod 31, inclined 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. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0018] like Figures 1 to 13 As shown, the scissor-type intervertebral fusion device of the present invention comprises a base 1 and an upper support plate 2, wherein 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, and protruding teeth 5 are arranged on the lower surface of the base 1 and the upper surface of the upper support plate 2, and through holes 6 are opened on the base 1 and the upper support plate 2; A slide groove 11 is provided on the bottom surface of the base 1, a movable block 3 is installed in the slide groove 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; An arched top plate 4 is installed on the inner wall of the base 1, and an inclined groove 32 is opened on the side 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 groove 32. The arched top plate 4 is provided in multiple groups; A lifting block 21 is installed on the lower surface of the upper support plate 2, and a shaft 211 is installed on the lifting block 21. The arched top plate 4 passes through the gap between the shaft 211 and the lifting block 21. A limiting block 22 is installed on the lifting block 21. A limiting groove 12 is provided on the inner wall of the base 1, and the limiting block 22 matches the limiting groove 12. The scissor-type lifting mechanism comprises a lifting block 21, a shaft rod 211, an arched top plate 4, a movable block 3 and a push rod 31; After the fusion device is implanted into the patient's body, the doctor uses a special tool to screw the push rod 31 on the base 1, and the push rod 31 moves into the base 1 under the action of the thread. Then, the push rod 31 will push the movable block 3 to move in the slide groove 11. At the same time, since one end of the arched top plate 4 is inserted into the inclined groove 32, the movable block 3 will squeeze the arched top plate 4 when it moves. In this process, the arched top plate 4, the movable block 3 and the lifting block 21 are combined with each other to form a scissor structure, so that the two ends of the arched top plate 4 are squeezed and approached to each other, and the highest point on the arched top plate 4, that is, the contact point between the arched top plate 4 and the shaft 211 on the lifting block 21 will further rise upward, thereby driving the upper support plate 2 to gradually rise, so that the height of the fusion device is increased, which can adapt to the intervertebral height of different patients and has a good treatment effect. At the same time, a shaft rod 211 is installed on the lifting block 21, so that a gap is formed between the shaft rod 211 and the lifting block 21, so that the arched top plate 4 can pass through the gap. Under the condition that the arched top plate 4 is pressed and deformed upward, the lifting block 21 can be fully fixed and limited by the arched top plate 4. At the same time, the mutual matching between the limiting block 22 and the limiting groove 12 can further reduce the freedom of the lifting block 21 and the upper support plate 2 when adjusting the height of the fusion device, thereby ensuring the stability of the fusion device in the later stage of the patient's rehabilitation process, avoiding deformation and displacement of the fusion device, and affecting the patient's postoperative rehabilitation. At the same time, since the arched top plate 4 is squeezed by the movable plate, and the arched top plate 4 is connected with the lifting plate to form a scissor-type structure, the size of the scissor-type lifting mechanism inside the fusion device is relatively small when the height of the fusion device is not adjusted, thereby reducing the size of the entire fusion device, making it easier for doctors to implant the fusion device into the patient's body; At the same time, due to the patient's intervertebral height limitation, the height of the arched top plate 4 after being compressed can meet the need to adjust the height of the fusion device, that is, the scissor-type lifting mechanism using the arched top plate 4 can be equivalent to the scissor-type structure composed of multiple connecting rods used in the patent with application number CN201921108172.5 and the name of the scissor-type intervertebral fusion device in terms of height adjustment. At the same time, the scissor-type lifting mechanism using the arched top plate 4 uses a relatively small number of parts compared to the scissor structure composed of multiple connecting rods, and the arched structure of the arched top plate 4 disperses the force. The structural stability is relatively high, and there is no need to reserve a part of the space at the bottom for the scissor-type 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, reduce the height of the fusion device when not in use, facilitate the use of the fusion device and improve the applicability of the fusion device. At the same time, multiple groups of arched top plates 4 are set, so that the upper support plate 2 will have multiple force points when it is raised, ensuring that the upper support plate 2 is horizontal and stable, avoiding the connection points of the scissor-type structure composed of multiple links and the top plate are all located in the middle of the top plate, which is prone to skewing and offset.

[0019] As an embodiment of the present invention, the movable block 3 is located in the middle of the base 1, the arched top plate 4 is evenly arranged along the length direction of the base 1, and the arched top plate 4 is symmetrically arranged on both sides of the movable block 3; Since the arched top plate 4 is symmetrically arranged on both sides of the movable block 3, when the movable block 3 moves and drives the arched top plate 4 to push up, the upward force applied to the upper support plate 2 is evenly distributed, so that the lifting action of the upper support plate 2 is stable, and the upper support plate 2 is prevented from sliding or deflecting when the height of the fusion device is adjusted. At the same time, since there are multiple groups of arched top plates 4 and the arched top plates 4 are symmetrically arranged, the fulcrums between the upper support plates 2 and the arched top plates 4 are relatively more and evenly distributed, which further ensures that the upper support plate 2 is level and stable during movement, and ensures the applicability of the fusion device and good treatment effect.

[0020] As an embodiment of the present invention, a fixing groove 13 is provided on the inner wall of the base 1, and one end of the arched top plate 4 close to the inner wall of the base 1 is mounted on a fixing plate 41, and the fixing plate 41 is mounted in the fixing groove 13; Since there are multiple groups of arched top plates 4, one end of the arched top plates 4 is installed on the fixed plate 41, so that all the arched top plates 4 on the same side of the movable plate become a whole, thereby ensuring the position of the arched top plates 4 in the base 1 and the stability of the structure, and avoiding the arched top plates 4 from being skewed, offset, or misaligned due to external vibration and shaking before the fusion device adjusts its height and when the arched top plates 4 are not squeezed, thereby affecting the normal use and treatment effect of the fusion device. At the same time, since the arched top plates 4 become a whole through the fixed plate 41, it can also facilitate the installation of the arched top plates 4 by the staff when assembling the fusion device, thereby improving the efficiency of assembly.

[0021] As an embodiment of the present invention, a mounting groove 221 is provided on the side of the limit block 22, a locking plate 222 is installed in the mounting groove 221, one end of the locking plate 222 away from the base 1 is fixed in the mounting groove 221, one end of the locking plate 222 close to the base 1 is tilted and abuts against the inner wall of the limit groove 12, and the area on the inner wall of the limit groove 12 that contacts the locking plate 222 is provided with evenly distributed protrusions; Since the end of the locking plate 222 away from the base 1 is fixed in the mounting 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 be tightly attached to the inner wall of the limiting groove 12 under its own elastic action. Therefore, 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 pass over the protrusion under the elastic action, and then slide upward along the inner wall of the limiting groove 12, ensuring that the limiting 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 downward pressure, the lower end of the locking plate 222 will be stuck on the protrusion 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, thereby ensuring that the fusion device supports the upper and lower vertebral bodies stably and avoiding the problems of loosening, deformation and displacement of the fusion device.

[0022] As an embodiment of the present invention, a shielding plate 51 is installed on the surface 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; The hardness of the protruding teeth 5 is greater than the hardness of the shielding plate 51; 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 in the patient's body or when the position is adjusted between the vertebrae after implantation, the surface of the fusion device is relatively smooth, which is convenient for implantation and use of the fusion device, and avoids friction and interference between the protruding teeth 5 on the fusion device and the surgical incision and vertebral end plate on the patient, thereby reducing the wear of the protruding teeth 5 on the surface of the fusion device and reducing the pain of the patient; At the same time, after the fusion device is implanted in the patient's body and its position is adjusted, the doctor adjusts the scissor-type lifting mechanism in the fusion device to gradually raise the upper support plate 2, thereby completing the height adjustment of the fusion device and making the height of the fusion device adapt to the patient's intervertebral height, thereby improving the applicability and therapeutic effect of the fusion device. At the same time, since the hardness of the protruding tooth 5 is greater than the hardness of the baffle plate 51, when the upper support plate 2 gradually rises, the tip of the protruding tooth 5 will squeeze and pierce the baffle plate 51, and then the protruding tooth 5 will abut against the vertebral end plate, thereby ensuring the fixation effect of the fusion device between the vertebrae, avoiding the fusion device from falling out or shifting after installation, and affecting the patient's postoperative rehabilitation effect.

[0023] As an embodiment of the present invention, a weakening groove 512 is provided 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; By opening a weak groove 512 on the baffle plate 51, the thickness of the contact between the baffle plate 51 and the protruding tooth 5 is reduced. If the hardness of the protruding tooth 5 is greater than that of the baffle plate 51, the protruding tooth 5 can easily pierce and pass through the baffle plate 51, thereby preventing the tip of the protruding tooth 5 from being squeezed and damaged by the baffle plate 51, which would affect the fixation effect of the fusion device between the vertebrae.

[0024] 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 of the connecting plate 511 away from the protruding teeth 5; The connecting plate 511 is provided with an arc-shaped groove, so that when the shielding plate 51 is squeezed and the protruding teeth 5 pierce through the shielding plate 51, the connecting plate 511 is less likely to be deformed and bent, thereby further facilitating the protruding teeth 5 to pass through the shielding plate 51, thereby preventing the connecting plate 511 from being too strong, causing the protruding teeth 5 to be difficult to pass through the shielding plate 51 or the tip of the protruding teeth 5 to be damaged during the piercing process; At the same time, since the arc-shaped groove is located on the side of the connecting plate 511 away from the protruding tooth 5, when the shielding plate 51 is compressed and the connecting plate 511 is deformed, the connecting plate 511 is easy to bend toward the protruding tooth 5, thereby preventing the connecting plate 511 from bending and protruding away from the fusion device, causing additional damage to the patient.

[0025] As an embodiment of the present invention, a connecting hole is provided in the push rod 31, and an injection hole 33 is provided on the movable block 3, and the connecting hole and the injection hole 33 are connected to each other; After the height of the fusion device is adjusted, the doctor uses a tool to inject the filled aggregate into the fusion device from the connecting hole on 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 has filled the space in the fusion device overflows from the through hole 6 on the fusion device again, so that the aggregate is filled between the upper and lower vertebrae, facilitating bone fusion between the upper and lower vertebrae.

[0026] The specific workflow is as follows: After the fusion device is implanted into the patient's body, the doctor uses a special tool to screw the push rod 31 on the base 1, and 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 slide groove 11. At the same time, since one end of the arched top plate 4 is inserted into the inclined groove 32, the movable block 3 will squeeze the arched top plate 4 when it moves. In this process, the arched top plate 4, the movable block 3 and the lifting block 21 are combined with each other to form a scissor structure, so that the two ends of the arched top plate 4 are squeezed and approached to each other, and the highest point on the arched top plate 4, that is, the contact point between the arched top plate 4 and the shaft 211 on the lifting block 21 will further rise upward, thereby driving the upper support plate 2 to gradually rise, so that the height of the fusion device is increased; At the same time, a shaft rod 211 is installed on the lifting block 21, so that a gap is formed between the shaft rod 211 and the lifting block 21, so that the arched top plate 4 can pass through the gap, fully fixing and limiting the lifting block 21, and at the same time, reducing the freedom of the lifting block 21 and the upper support plate 2 when adjusting the height of the fusion device; At the same time, since the arched top plate 4 is squeezed by the movable plate, and the arched top plate 4 is connected with the lifting plate to form a scissor-type structure, the size of the scissor-type lifting mechanism inside the fusion device is relatively small when the height of the fusion device is not adjusted, thereby reducing the size of the entire fusion device relatively. At the same time, due to the patient's intervertebral height limitation, the height of the arched top plate 4 after being compressed can meet the demand for adjusting the height of the fusion device, that is, the scissor-type lifting mechanism using the arched top plate 4 can be equivalent to the existing technology such as the scissor-type structure composed of multiple connecting rods used in the patent with application number CN201921108172.5 and the name of the scissor-type intervertebral fusion device in terms of height adjustment. At the same time, the scissor-type lifting mechanism using the arched top plate 4 uses a relatively small number of components compared to the scissor-type structure composed of multiple connecting rods, and the arched structure of the arched top plate 4 has a relatively high stability in terms of dispersed force, and there is no need to reserve a part of the space below for the scissor-type 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. At the same time, multiple groups of arched top plates 4 are set, so that the upper support plate 2 will have multiple force points when it is raised, ensuring that the upper support plate 2 is level and stable; Since the arched top plates 4 are symmetrically arranged on both sides of the movable block 3, the upward force on the upper support plate 2 is evenly distributed, so that the lifting action of the upper support plate 2 is stable. At the same time, since there are multiple groups of arched top plates 4 and the arched top plates 4 are symmetrically arranged, the fulcrums between the upper support plates 2 and the arched top plates 4 are relatively more and evenly distributed, further ensuring that the upper support plate 2 is horizontal and stable during movement; Since multiple groups of arched top plates 4 are provided, one end of each of the arched top plates 4 is mounted on the fixed plate 41, so that all the arched top plates 4 on the same side of the movable plate become a whole, thereby ensuring the position of the arched top plates 4 in the base 1 and the stability of the structure. 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; Since the 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 be tightly attached to the inner wall of the limiting groove 12 under its own elastic action. 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 pass over the protrusion under the elastic action, and then slide upward along the inner wall of the limiting groove 12. At the same time, after the height of the fusion device is adjusted, when the upper support plate 2 is subjected to downward pressure, the lower end of the locking plate 222 will be stuck on the protrusion 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; 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 in the patient's body or when the position is adjusted between the vertebrae after implantation, the surface of the fusion device is relatively smooth, which is convenient for implantation and use of the fusion device, and avoids friction and interference between the protruding teeth 5 on the fusion device and the surgical incision and vertebral end plates on the patient's body; At the same time, after the fusion device is implanted in the patient's body and the position is adjusted, the doctor adjusts the scissor-type lifting mechanism in the fusion device to gradually raise the upper support plate 2. Since the hardness of the protruding teeth 5 is greater than the hardness 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 the shielding plate 51, and then the protruding teeth 5 will abut against the vertebral end plate; By providing a weak groove 512 on the shielding plate 51, the thickness of the contact between the shielding plate 51 and the protruding teeth 5 is reduced, and the hardness of the protruding teeth 5 is greater than the hardness of the shielding plate 51, so that the protruding teeth 5 can easily pierce and pass through the shielding plate 51; An arc-shaped groove is provided on the connecting plate 511, so that when the shielding plate 51 is squeezed and the protruding teeth 5 pierce through the shielding plate 51, it is less difficult for the connecting plate 511 to be deformed and bent, which facilitates the protruding teeth 5 to pass through the shielding plate 51; 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 is deformed, the connecting plate 511 is easy to bend toward the protruding teeth 5; After the height of the fusion device is adjusted, the doctor uses a tool to inject the filled aggregate into the fusion device from the connecting hole on 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 has filled the space in the fusion device overflows from the through hole 6 on the fusion device again, so that the aggregate is filled between the upper and lower vertebrae, facilitating bone fusion between the upper and lower vertebrae.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A scissor-type intervertebral fusion device, comprising a base (1) and an upper support plate (2), wherein 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 arranged on the lower surface of the base (1) and the upper surface of the upper support plate (2), and through holes (6) are opened on the base (1) and the upper support plate (2); Features: A slide groove (11) is provided on the bottom surface of the base (1), a movable block (3) is installed in the slide groove (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); An arched top plate (4) is installed on the inner wall of the base (1), an inclined groove (32) is opened on the side of the movable block (3), and one end of the arched top plate (4) away from the inner wall of the base (1) is inserted into the inclined groove (32), and the arched top plate (4) is provided in multiple groups; A lifting block (21) is installed on the lower surface of the upper support plate (2), a shaft (211) is installed on the lifting block (21), the arched top plate (4) passes through the gap between the shaft (211) and the lifting block (21), a limiting block (22) is installed on the lifting 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) match each other; The scissor-type lifting mechanism comprises a lifting block (21), a shaft rod (211), an arched top plate (4), a movable block (3) and a push rod (31).

2. The scissor-type intervertebral fusion cage according to claim 1, characterized in that: The movable block (3) is located in the middle of the base (1), the arched top plate (4) is evenly arranged along the length direction of the base (1), and the arched top plate (4) is symmetrically arranged on both sides of the movable block (3).

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

4. The scissor-type intervertebral fusion cage according to claim 1, characterized in that: A mounting groove (221) is provided on the side of the limiting block (22), a locking plate (222) is installed in the mounting groove (221), one end of the locking plate (222) away from the base (1) is fixed in the mounting groove (221), one end of the locking plate (222) close to the base (1) is tilted and abuts against the inner wall of the limiting groove (12), and the area on the inner wall of the limiting groove (12) that contacts the locking plate (222) is provided with evenly distributed protrusions.

5. The scissor-type intervertebral fusion cage according to claim 1, characterized in that: A shielding plate (51) is installed on the surface of the base (1) and the upper support plate (2) via a connecting plate (511), and the protruding teeth (5) are located below the shielding plate (51); The hardness of the protruding teeth (5) is greater than the hardness of the shielding plate (51).

6. The scissor-type intervertebral fusion cage according to claim 5, characterized in that: A weakening groove (512) is provided 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).

7. The scissor-type intervertebral fusion cage according to claim 5, characterized in that: An arc-shaped groove is provided 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).

8. The scissor-type intervertebral fusion cage according to claim 1, characterized in that: A connecting hole is provided in the push rod (31), an injection hole (33) is provided on the movable block (3), and the connecting hole and the injection hole (33) are communicated with each other.

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