Anti-migration monolithic expandable intervertebral fusion device
By designing an expandable intervertebral fusion device that forms a sealed cavity with a deformable outer shell and an inner shell, the problems of fusion device collapse and spinal misalignment were solved, achieving stability and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI CHANGZHENG HOSPITAL
- Filing Date
- 2022-03-22
- Publication Date
- 2026-06-05
AI Technical Summary
Existing spinal fusion devices are prone to sinking and collapsing during long-term use, resulting in poor stability, stress concentration, and spinal misalignment, requiring frequent replacement.
The anti-displacement integral expansion intervertebral fusion device adopts a sealed cavity formed by the deformation outer shell and the deformation inner shell. Combined with the connecting device and the clamping device, it achieves surface contact support between the deformation outer shell and the spine, reduces stress concentration, and ensures stable installation of the device through wedge blocks and limiting plates.
It improves the stability of the fusion device, prevents collapse and spinal misalignment, reduces patient pain, simplifies the operation process, and enhances the long-term support effect of the device between the vertebrae.
Smart Images
Figure CN114587721B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of interbody fusion devices, specifically to an expandable interbody fusion device. Background Technology
[0002] Spinal fusion is one of the main treatment methods for various spinal disorders. However, conventional spinal fusion devices have the following shortcomings: During prolonged use, the patient's body weight can cause the fusion device installed between the vertebrae to sink and collapse, resulting in poor stability. Furthermore, the contact points between the fusion device and the vertebrae are often supported at several points. Over time, stress concentration at these points can lead to collapse and breakage. A collapsed fusion device can also cause displacement between the vertebrae, resulting in misalignment, pain for the patient, and the need for replacement of the fusion device, which is quite troublesome. Summary of the Invention
[0003] To address the problems of existing technologies where the fusion device and spine only make contact at various points and the fusion device breaks and collapses, this invention provides an anti-displacement integral expansion intervertebral fusion device.
[0004] The technical solution of the present invention is as follows: it includes a support plate installed between the vertebrae, and a deformable outer shell is provided on the end face of the support plate corresponding to the vertebrae, and the deformable outer shell is in contact with the vertebrae; the feature is that a deformable inner shell is provided between the deformable outer shell and the support plate, and a sealed cavity is formed between the deformable inner shell and the deformable outer shell; a connecting device is provided between the two deformable outer shells, and a clamping device is provided inside the connecting device, which can clamp the support plate.
[0005] Furthermore, the opposing end faces of the deformable outer shell and the corresponding deformable inner shell are both concave, and the concave surfaces of the deformable outer shell and the deformable inner shell are sealed together to form a cavity.
[0006] Furthermore, the connecting device includes a first sleeve, with an arc-shaped plate provided at the end face of the first sleeve corresponding to the position of the deformable shell, and an extension plate provided at the side face of the deformable shell corresponding to the end face of the arc-shaped plate. A first through groove is opened on the end face of the arc-shaped plate, and the extension plate is connected to the first through groove.
[0007] Furthermore, a second through groove is formed on the end face of the first sleeve, a support plate is provided in the second through groove, and a clamping device is provided in the first sleeve.
[0008] Furthermore, the clamping device includes a gripping rod, an extension rod is provided inside the first sleeve, a gripping rod is provided on the end face of the extension rod, and the gripping rod is connected to the support plate.
[0009] Furthermore, a pivot is provided on the end face of the support plate, and a limiting plate is rotatably connected to the pivot. A countersunk hole is provided on the limiting plate at the position corresponding to the gripper, and the end of the gripper is located in the countersunk hole.
[0010] Furthermore, a second sleeve is installed inside the first sleeve, and an extension rod is installed inside the second sleeve. The grab rod is rotatably connected to the extension rod, and a torsion spring is installed at the rotatable part. A third through groove is opened on the end face of the second sleeve at the position corresponding to the grab rod.
[0011] Furthermore, a rotating rod is installed inside the second sleeve, and the rotating rod is rotatably connected to the extension rod. A handle is provided at the outer end of the rotating rod.
[0012] Furthermore, a protrusion is provided on the side of the rotating rod, and a fourth through groove is opened on the end face of the second sleeve at the position corresponding to the protrusion. A disc is provided on the side of the second sleeve near the position of the fourth through groove.
[0013] Furthermore, the support plate is provided with multiple wedge-shaped blocks at the positions corresponding to the deformable inner shell.
[0014] The beneficial effects achieved by this invention are as follows: By having two deformable outer shells contact the spine, a cavity is formed between the outer and inner deformable shells. When the spine compresses the outer shells, the deformation of the outer shells is controlled, without affecting the inner deformable shell. This ensures proper contact between the inner deformable shell and the support plate, preventing collapse and avoiding direct pressure on the support plate. It only increases the pressure within the cavity. Even if the deformable shells fuse with the spine, the cavity remains unaffected, thus providing long-term spinal support. The deformable shells gradually adapt to the shape of the spine, changing from "point contact" to "surface contact," reducing stress concentration and ensuring the stability of the invention. The device allows two deformable outer shells to be inserted between two vertebrae via a hand handle. A support plate is then inserted between the two deformable inner shells, causing the deformable outer shells to compress the vertebrae and provide support. A clamping device facilitates both the transport of the support plate and the rotation of the limiting plate, enabling faster operation by the doctor and reducing patient discomfort. The limiting plate connects to the vertebrae, ensuring stable installation. Wedge-shaped blocks prevent the support blocks from detaching during long-term use and also cause deformation of the inner shells, increasing pressure within the cavity. This enhances the support strength of the deformable outer shells, preventing vertebral collapse and protecting the patient's body. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of this embodiment;
[0016] Figure 2 This is a three-dimensional schematic diagram of the first installation scenario in this embodiment;
[0017] Figure 3 This is a schematic diagram of the installation of the deformable outer shell and the deformable inner shell in this embodiment;
[0018] Figure 4This is a three-dimensional structural diagram of the connecting device in this embodiment;
[0019] Figure 5 This is an exploded view of the clamping device in this embodiment;
[0020] Figure 6 This is a three-dimensional structural diagram of the second installation configuration in this embodiment. Detailed Implementation
[0021] To facilitate understanding of the present invention by those skilled in the art, specific embodiments of the present invention will be described below with reference to the accompanying drawings.
[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0024] It should be noted that when a component is said to be "attached" to another component, it can be directly on the other component or it can be in the middle of another component. When a component is said to be "set" to another component, it can be directly set to the other component or it may also be in the middle of another component. When a component is said to be "fixed" to another component, it can be directly fixed to the other component or it may also be in the middle of another component.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.
[0026] This invention provides an anti-displacement integral expansion interbody fusion device, such as... Figure 1 and Figure 3As shown, it includes two deformable outer shells 1, one above the other, located between two vertebrae 2. The outer end face of the deformable outer shell 1 fits against the end of the human spine 2. During use, due to the compression of the spine, the deformable outer shell 1 gradually deforms into a shape that matches the spine 2, changing from "point support" to "surface support" to better support the spine 2. In order to ensure that the deformable outer shell 1 can gradually deform into a shape that fits the spine 2 during use, one end face of the deformable outer shell 1 is concave. The concave surfaces of the two deformable outer shells 1 face each other. Deformable inner shells 3 are fixedly installed on the concave surfaces of the deformable outer shells 1. In order to ensure that the installation in this embodiment is more stable and that the deformable outer shell 1 fits the spine 2 better, the end face of the deformable inner shell 3 near the corresponding deformable outer shell 1 is concave, and a sealed cavity 4 is formed between the deformable outer shell 1 and the deformable inner shell 3. Two extension edges 5 are symmetrically installed on the side of the deformable outer shell 1 for easy clamping and installation between the spine 2.
[0027] In daily life, the spine 2 supports the user's body. The two spines 2 support part of the weight. When the upper and lower spines 2 are compressed, because there is a cavity 4 between the deformable outer shell 1 and the deformable inner shell 3, when the spine 2 is compressed on the deformable outer shell 1, the deformable outer shell 1 slowly deforms, so that the deformable outer shell 1 becomes a shape that matches the spine 2, ensuring better support for the spine 2. The space inside the cavity 4 is compressed, so there is a certain pressure against the deformable outer shell 1, preventing the deformable outer shell 1 from being compressed further and causing collapse.
[0028] like Figure 1 and Figure 4 As shown, in order to simultaneously install two deformable shells 1 between two spines 2, an arc-shaped plate 6 is provided at the position corresponding to the deformable shell 1. The end face of the arc-shaped plate 6 and the position of the corresponding extension edge 5 are provided with a first through groove 7 that is adapted to each other. The extension edge 5 and the first through groove 7 can be interlocked. A first sleeve 8 is provided between the two deformable shells 1. The end of the first sleeve 8 is fixedly connected to the outer side of the two arc-shaped plates 6. By inserting the extension edge 5 of the deformable shell 1 into the middle of the corresponding first through groove 7, the two deformable shells 1 can be simultaneously inserted between the two spines 2 through the first sleeve 8.
[0029] like Figure 1As shown, a support block 9 is provided between the two deformable inner shells 3. A second through slot 10 is formed at the end face of the first sleeve 8 corresponding to the position of the support block 9, extending radially through the first sleeve 8. The support block 9 is located within the second through slot 10. After the two deformable outer shells 1 are inserted between the two spines 2, the support block 9 is then inserted between the two deformable inner shells 3. At this time, the support block 9 compresses the two deformable inner shells 3, thereby tightly pressing the two deformable outer shells 1 against the end face of the spine 2. To prevent the support block 9 from sliding out between the two deformable inner shells 3, in this embodiment, the contact surfaces between the support block 9 and the deformable inner shells 3 are provided with... Several evenly distributed wedge-shaped blocks 11, with the inclined surfaces of the wedge-shaped blocks 11 facing the deformable inner shell 3, have the advantage of making it easy to insert the support block 9 between the two deformable inner shells 3. During long-term use, the wedge-shaped blocks 11 slowly compress the deformable inner shell 3, causing the deformable inner shell 3 to gradually fit into the wedge-shaped blocks 11. This prevents the support block 9 from sliding out between the two deformable inner shells 3. Furthermore, the deformable inner shell 3 deforms, causing the volume of the cavity 4 between the deformable outer shell 1 and the deformable inner shell 3 to change and decrease. At this time, the air pressure in the cavity 4 increases, which more effectively prevents the deformable outer shell 1 from collapsing.
[0030] To facilitate the doctor's operation, the deformable outer shell 1 is inserted into the middle of the patient's spine 2, such as... Figure 1 and Figure 5 As shown, the first sleeve 8 is inserted into the second sleeve 12. The end of the second sleeve 12 away from the support plate 9 is inserted into the rotating rod 13. The inner end of the rotating rod 13 is rotatably connected to the extension rod 14. The end of the extension rod 14 near the support plate 9 is provided with a gripping rod 15. In this embodiment, it is preferable that there are two gripping rods 15. The gripping rods 15 can grasp the support plate 9 and push the rotating rod 13 through the extension rod 14 and the gripping rods 15 to insert the support block 9 into the two deformable inner shells 3. This helps to facilitate the doctor's operation.
[0031] like Figure 5 As shown, the ends of the gripping rod 15 and the extension rod 14 are rotatably connected, and a torsion spring is installed at the rotatable part so that the gripping rod 15 is in an open state under normal conditions. The support block 9 is fixedly installed with the rotating shaft 16 near the end face of the gripping rod 15. The limiting plate 17 is rotatably connected to the rotating shaft 16. The side of the limiting plate 17 is provided with countersunk holes 18 near both ends. The end of the gripping rod 15 extends into the corresponding countersunk hole 18. Pulling the rotating rod 13 backward drives the extension rod 14 to move, so that the side of the gripping rod 15 contacts the end of the second sleeve 12. The action of the end face of the second sleeve 12 causes the gripping rod 15 to rotate and retract. The action of the side of the countersunk hole 18 causes the gripping rod 15 to grip the limiting plate 17. At this time, the synchronous movement of the rotating rod 13 and the second sleeve 12 can drive the support block 9 to move, so that the support rod 9 can be easily inserted between the two deformable inner shells 3.
[0032] To make this embodiment more stable and reliable in use, such as Figure 5As shown, a third through groove 18 is opened at the end face of the second sleeve 12 corresponding to the position of the gripping rod 15. When the gripping rod 15 grips the limiting plate 17, the side of the gripping rod 15 extends into the third through groove 18, making the gripping rod 15 grip more stably. At the same time, several protrusions 19 are installed on the side of the rotating rod 13 in the circumferential direction. In this embodiment, the number of protrusions 19 is preferably two. When the gripping rod 15 grips the limiting plate 17, the side of the protrusions 19 contacts the end face of the second sleeve 12, thereby fixing the rotating rod 13, the extension rod 14 and the second sleeve 12 relative to each other. In order to make the gripping rod 15 and the limiting plate... 17. Separate the second sleeve 12 and open the fourth through groove 20 at the position corresponding to the protrusion 19. Rotate the rotating rod 13 to align the protrusion 19 with the fourth through groove 20. At this time, the rotating rod 13 can be pushed inward, and the gripping rod 15 also moves out from the third through groove 18. At this time, the gripping rod 15 slowly opens under the action of the torsion spring and can be moved out from the countersunk hole 18, so that the gripping rod 15 is separated from the support plate 9, and the fusion device is installed between the spine 2. When the protrusion 19 is in the fourth through groove 20, the gripping rod 15 is in an open state. When the protrusion 19 is located at the end face of the second sleeve 12, the gripping rod 15 is in a closed state.
[0033] For ease of operation, such as Figure 5 As shown, a handle 21 is fixedly installed at the outer end of the rotating rod 13, and a disc 22 is fixedly installed on the side of the second sleeve 12 near the fourth through slot 20.
[0034] like Figure 2 As shown, the doctor places the support plate 9 into the second through slot 10, allowing the end of the grabbing rod 15 to extend into the countersunk hole 18. Then, the doctor grasps the handle 21 and pulls it outwards. After the protrusion 19 moves out of the fourth through slot 20, the doctor rotates the handle 21, causing the rotating rod 13 to rotate, so that the side of the protrusion 20 contacts the end face of the second sleeve 12. At this point, the grabbing rod 15 can grip the limiting plate 17. Then, the deformable outer shell 1 is installed on the arc plate 6 via the extension edge 5. The two deformable outer shells 1 are then inserted into the spine 2. Pushing the handle 21 moves the second sleeve 12 and the grabbing rod 15, thus inserting the support plate 9 into the two deformable inner shells 3. At this point, pulling the first sleeve 8 outwards causes the end of the second sleeve 12 to extend from the inner end of the first sleeve 8. Rotating the second sleeve 12, under the action of the grabbing rod 15, causes the limiting plate 17 to rotate around the rotating shaft 16. Figure 6 As shown, at this time, both ends of the limiting plate 17 are in contact with the spine 2. Then, rotate the rotating rod 13 to align the protrusion 19 with the fourth through groove 20. The protrusion 19 enters the fourth through groove 20. After the grab rod 15 separates, it separates from the limiting plate 17. The limiting plate 17 can be fixed to the spine 2 by the countersunk screw 23, and the fusion device can be installed. In order to facilitate installation, both ends of the limiting plate 17 are bent, so that the limiting plate 17 and the spine 2 can make it easier for the doctor to turn the countersunk screw 23.
[0035] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A displacement-preventing integral expansion intervertebral fusion device, comprising a support plate (9) installed between vertebrae (2), wherein each end face of the support plate (9) corresponding to the vertebrae (2) is provided with a deformable shell (1), and the deformable shell (1) contacts the vertebrae (2); characterized in that: A deformable inner shell (3) is provided between the deformable outer shell (1) and the support plate (9). A sealed cavity (4) is formed between the deformable inner shell (3) and the deformable outer shell (1). A connecting device is provided between the two deformable outer shells (1). The connecting device connects the two deformable outer shells (1). A clamping device is provided inside the connecting device. The clamping device can clamp the support plate (9). The opposing end faces of the deformable outer shell (1) and the corresponding deformable inner shell (3) are concave, and the concave surfaces of the deformable outer shell (1) and the deformable inner shell (3) are sealed together to form a cavity (4).
2. The anti-displacement integral expansion interbody fusion device according to claim 1, characterized in that: The connecting device includes a first sleeve (8), an arc plate (6) is provided at the end face of the first sleeve (8) corresponding to the position of the deformable shell (1), an extension plate (5) is provided at the side face of the deformable shell (1) corresponding to the end face of the arc plate (6), a first through groove (7) is opened at the end face of the arc plate (6), and the extension plate (5) is connected to the first through groove (7).
3. The anti-displacement integral expansion interbody fusion device according to claim 2, characterized in that: The first sleeve (8) has a second through groove (10) on its end face, a support plate (9) is provided in the second through groove (10), and a clamping device is provided in the first sleeve (8).
4. The anti-displacement integral expansion interbody fusion device according to claim 1 or 3, characterized in that: The clamping device includes a gripping rod (15), an extension rod (14) is provided inside the first sleeve (8), the end face of the extension rod (14) is provided with the gripping rod (15), and the gripping rod (15) is connected to the support plate (9).
5. The anti-displacement integral expansion interbody fusion device according to claim 4, characterized in that: The support plate (9) is provided with a rotating shaft (16) on its end face. A limiting plate (17) is rotatably connected to the rotating shaft (16). A countersunk hole (18) is opened on the limiting plate (17) at the position corresponding to the gripping rod (15). The end of the gripping rod (15) is located in the countersunk hole (18).
6. The anti-displacement integral expansion interbody fusion device according to claim 5, characterized in that: The first sleeve (8) is fitted with a second sleeve (12), and the second sleeve (12) is fitted with an extension rod (14). The grab rod (15) is rotatably connected to the extension rod (14), and a torsion spring is installed at the rotatable part. A third through groove (18) is opened at the end of the second sleeve (12) corresponding to the position of the grab rod (15).
7. The anti-displacement integral expansion interbody fusion device according to claim 6, characterized in that: The second sleeve (12) is fitted with a rotating rod (13), which is rotatably connected to the extension rod (14). A handle (21) is provided at the outer end of the rotating rod (13).
8. The anti-displacement integral expansion interbody fusion device according to claim 7, characterized in that: The rotating rod (13) has a protrusion (19) on its side, and the end face of the second sleeve (12) has a fourth through groove (20) at the position corresponding to the protrusion (19). A disc (22) is provided on the side of the second sleeve (12) near the fourth through groove (20).
9. A transposition-resistant integral expansion interbody fusion device according to any one of claims 1-8, characterized in that: The support plate (9) is provided with multiple wedge blocks (11) at the position corresponding to the deformable inner shell (3).