Distraction interbody fusion cage

Abstract

The utility model discloses a strutting intervertebral fusion cage which comprises two sets of supporting seats, the two sets of supporting seats are movably installed through a plane detachable hinge, a protection pipe is installed at the center of the plane detachable hinge in a penetrating mode, a threaded pipe is rotatably installed at the outer end of the protection pipe, and a threaded rod is installed at the outer end of the threaded pipe. And a rotating rod is fixedly mounted at one end of the threaded pipe. The internal hexagonal wrench extends into the protection pipe to rotate the hexagonal column to control the threaded pipe to rotate, so that the internal threaded pipe is pushed to move, the two sets of supporting rods are controlled to support outwards, supporting between the supporting rods and a cone is completed, meanwhile, after the using angles of the two sets of supporting bases are fixed, the internal hexagonal wrench is pulled out from the interior of the protection pipe, and the supporting rods are pulled out. The supporting force reduction caused by direct control over the threaded pipe is avoided, the use position of the positioning plate is positioned through the arranged connecting bolts, and the control and adjustment over the centrum lateral protrusion are completed by locking the two sets of side stress plates installed at the two ends of the positioning plate through the adjusting bolts.

Description

Technical Field

[0001] This utility model relates to the field of orthopedic implant technology, specifically to an expandable intervertebral fusion device. Background Technology

[0002] Lumbar interbody fusion is an effective treatment for lumbar degeneration and instability. It fuses the upper and lower vertebrae, maintains the intervertebral space height, reduces nerve root pressure, and maintains spinal stability. It has satisfactory clinical results, minimal surgical trauma, and is easy to perform.

[0003] In recent years, with the promotion of clinical application and the progress of theoretical research, it has been gradually discovered that conventional fusion devices still have certain shortcomings, such as poor self-stabilizing performance of intervertebral implants and unsatisfactory recovery of lumbar lordosis after vertebral fusion surgery.

[0004] To address these issues, a type of expandable interbody fusion device is currently being used. While existing expandable interbody fusion devices on the market can effectively maintain the intervertebral space height and alleviate symptoms caused by vertebral compression, they are mostly expandable anteroposteriorly and laterally, which is insufficient for treating conditions such as scoliosis. Therefore, there is a need for expandable interbody fusion devices. Utility Model Content

[0005] The purpose of this invention is to provide an expandable intervertebral fusion device that supports the vertebrae by means of two sets of expandable support seats. After the support is completed, a positioning plate can be installed, and the lateral force plates on both sides of the positioning plate can improve scoliosis symptoms, thereby solving the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an interbody fusion device that can be opened includes a support base, wherein two sets of support bases are provided, and the two sets of support bases are movably installed by a planar release hinge. A protective tube is installed through the center of the planar release hinge, and a threaded tube is rotatably installed at the outer end of the protective tube. A rotating rod is fixedly installed at one end of the threaded tube. The rotating rod is rotatably installed inside the protective tube, and a hexagonal column is installed at the end of the rotating rod. An internal threaded tube is installed on the external thread of the threaded tube, and two sets of support rods for supporting the support base are symmetrically installed on the outer arc surface of the internal threaded tube.

[0007] A set of positioning plates is installed on the outside of the protective tube by connecting bolts, and two sets of side force plates are symmetrically installed at both ends of the positioning plates.

[0008] Preferably, the two sets of support seats are installed opposite to each other, and the two sets of support seats are respectively provided with mounting platforms. The mounting platforms are provided with a certain tilt angle, and the surface of the mounting platforms is provided with sliding grooves.

[0009] Preferably, each of the two sets of support seats has a first positioning platform on its corresponding side, and a positioning frame is installed on the surface of each first positioning platform.

[0010] Preferably, a set of protective pads is glued to the outside of both sets of support seats, and anti-slip protrusions are provided on the side of each set of protective pads that are glued to the support seat.

[0011] Preferably, the rotating rod is fixedly installed on the outer arc surface inside the protective tube with a limiting plate, the limiting plate is rotatably installed against the inner wall of the protective tube, the hexagonal column does not contact the inner wall of the protective tube, and the rotating rod is rotatably installed against the protective tube.

[0012] Preferably, the outer arc surface of the internally threaded pipe is symmetrically provided with two sets of second positioning platforms. Each set of second positioning platforms is equipped with a set of mounting brackets. One end of each set of support rods is rotatably installed inside the mounting bracket, and the other end of each set of support rods is rotatably installed inside the corresponding positioning bracket.

[0013] Preferably, a first storage tray is fixedly installed in the middle of the positioning plate, and the connecting bolt nuts are completely stored inside the first storage tray. A second storage tray is installed in the middle of the side force plate corresponding to the plane detachment hinge position. A set of adjusting bolts is installed inside each set of second storage trays, and the end of the adjusting bolt is threaded to one end of the plane detachment hinge.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] By inserting an Allen wrench into the protective tube and rotating the hexagonal column, the threaded tube is rotated, thereby moving the internal threaded tube to adjust the operating angle of the two sets of mounting brackets. This, in turn, controls the two sets of mounting brackets to extend outward, thus providing support between the vertebral body and the support rods. After the operating angle of the two sets of support rods is fixed, the Allen wrench is pulled out from the protective tube to avoid a decrease in support force caused by directly controlling the threaded tube. The position of the positioning plate is located by the connecting bolts, and the two sets of side force plates installed at both ends of the positioning plate are locked by the adjusting bolts to control and adjust the lateral curvature of the vertebral body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram showing the disassembled installation structure of the positioning plate of this utility model;

[0018] Figure 3 This is a disassembled schematic diagram of the internal threaded pipe installation structure of this utility model;

[0019] Figure 4 This is a schematic diagram showing the disassembled installation structure of the protective pad of this utility model;

[0020] Figure 5 This is a schematic diagram of the overall structure of the positioning plate of this utility model.

[0021] In the diagram: 1. Support base; 2. Protective pad; 3. Anti-slip protrusions; 4. Mounting platform; 5. Slide groove; 6. First positioning platform; 7. Positioning frame; 8. Flat detachment hinge; 9. Protective tube; 10. Threaded tube; 11. Rotating rod; 12. Limiting plate; 13. Hexagonal column; 14. Internally threaded tube; 15. Second positioning platform; 16. Mounting frame; 17. Support rod; 18. Positioning plate; 19. First storage tray; 20. Connecting bolt; 21. Side force plate; 22. Second storage tray; 23. Adjusting bolt. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figures 1-5 As shown, this utility model provides an interbody fusion device that can be opened, including a support base 1. The support base 1 is provided in two sets, and the two sets of support base 1 are movably installed by a planar release hinge 8. A protective tube 9 is installed through the center of the planar release hinge 8. A threaded tube 10 is rotatably installed at the outer end of the protective tube 9. A rotating rod 11 is fixedly installed at one end of the threaded tube 10. The rotating rod 11 is rotatably installed inside the protective tube 9, and a hexagonal column 13 is installed at the end of the rotating rod 11. An internal threaded tube 14 is installed on the external thread of the threaded tube 10. Two sets of support rods 17 for supporting the support base 1 are symmetrically installed on the outer arc surface of the internal threaded tube 14. The planar release hinge 8 is provided with threaded grooves at both ends. The support base 1 is connected by the planar release hinge 8. By rotating the hexagonal column 13 at the end of the rotating rod 11, the control of the threaded tube 10 is ensured, thereby better controlling the rotation of the internal threaded tube 14 and changing the use angle of the support rod 17 to complete the support of the support base 1.

[0024] A set of positioning plates 18 is locked to the outside of the protective tube 9 by connecting bolts 20. Two sets of side force plates 21 are symmetrically installed at both ends of the positioning plates 18. The positioning plates 18 are positioned by the connecting bolts 20, and the side force plates 21 are positioned by the positioning plates 18 to complete the protection of the lateral bending vertebra.

[0025] Two sets of support seats 1 are installed opposite each other, and the two sets of support seats 1 are respectively provided with mounting platforms 4. The mounting platforms 4 are set with a certain tilt angle, and the surface of the mounting platforms 4 is provided with sliding grooves 5. The mounting platforms 4 on the surface of the support seats 1 enable the two sets of support seats 1 to complete the opening operation during the force process, thereby improving the support of the vertebral body.

[0026] Two sets of support bases 1 are respectively provided with a set of first positioning platforms 6 on their corresponding sides. Each set of first positioning platforms 6 is equipped with a set of positioning frames 7. The first positioning platforms 6 limit the positioning frames 7. The positioning frames 7 are used to support one end of the support rod 17, ensuring the rotation of the support rod 17.

[0027] Each of the two sets of support bases 1 has a set of protective pads 2 glued to its exterior. Each set of protective pads 2 has anti-slip protrusions 3 on the side where it is glued to the support base 1. The anti-slip protrusions 3 can improve the adhesion between the protective pads 2 and the support base 1, so as to better protect the vertebral body.

[0028] It is worth noting that the rotating rod 11 is fixedly installed with a limiting plate 12 on the outer arc surface inside the protective tube 9. The limiting plate 12 is installed in contact with the inner wall of the protective tube 9 and rotates. The hexagonal column 13 does not contact the inner wall of the protective tube 9, and the rotating rod 11 is installed in contact with the protective tube 9 and rotates through the protective tube 9. The limiting plate 12 on the outside of the installed rotating rod 11 rotates in contact with the inner wall of the protective tube 9, which can limit the position of the rotating rod 11 and the threaded tube 10. Thus, when the protective tube 9 is subjected to force and rotates, the position of the threaded tube 10 will not move. During the rotation, the threaded tube 10 exerts force on the internal threaded tube 14, causing the internal threaded tube 14 to move, thereby pushing the two sets of support rods 17 to support the support seat 1.

[0029] Specifically, two sets of second positioning platforms 15 are symmetrically provided on the outer arc surface of the internally threaded tube 14. Each set of second positioning platforms 15 is equipped with a set of mounting brackets 16. One end of each set of support rods 17 is rotatably installed inside the mounting bracket 16, and the other end of each set of support rods 17 is rotatably installed inside the corresponding positioning bracket 7. The second positioning platforms 15 provided on the outer arc surface of the internally threaded tube 14 enable the mounting brackets 16 to be installed and used symmetrically and stably. This allows the use angle of the support rods 17 to be changed during the movement of the internally threaded tube 14, thereby better changing the opening angle of the support seat 1.

[0030] In addition, a first storage tray 19 is fixedly installed in the middle of the positioning plate 18, and the nuts of the connecting bolts 20 are completely stored inside the first storage tray 19. A second storage tray 22 is installed in the middle of the side force plate 21 corresponding to the position of the plane detachment hinge 8. Each set of second storage trays 22 has a set of adjusting bolts 23 installed inside, and the end of the adjusting bolts 23 is threaded and installed at one end of the plane detachment hinge 8. The first storage tray 19 installed in the middle of the positioning plate 18 can store the connecting bolts 20. The positioning plate 18 is positioned by the connecting bolts 20, and the protective tube 9 is covered at the same time. In addition, the positioning plate 18 limits the side force plate 21. The two sets of side force plates 21 limit the lateral bending vertebra. The angle of use of the side force plate 21 can be adjusted by locking the adjusting bolts 23 with the plane detachment hinge 8 to ensure its adjustment of the vertebra.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A retractable interbody fusion device, characterized in that: Includes a support base (1), which is provided in two sets, and the two sets of support bases (1) are movably installed by a plane detachment hinge (8). A protective tube (9) is installed through the center of the plane detachment hinge (8), and a threaded tube (10) is rotatably installed at the outer end of the protective tube (9). A rotating rod (11) is fixedly installed at one end of the threaded tube (10). The rotating rod (11) is rotatably installed inside the protective tube (9), and a hexagonal column (13) is installed at the end of the rotating rod (11). An internal threaded tube (14) is installed on the external thread of the threaded tube (10), and two sets of support rods (17) for supporting the support base (1) are symmetrically installed on the outer arc surface of the internal threaded tube (14). The protective tube (9) is fitted with a set of positioning plates (18) by connecting bolts (20), and two sets of side force plates (21) are symmetrically installed at both ends of the positioning plates (18).

2. The expandable interbody fusion device according to claim 1, characterized in that: The two sets of support bases (1) are installed opposite each other, and the two sets of support bases (1) are respectively provided with mounting platforms (4). The mounting platforms (4) are provided with a certain tilt angle, and the surface of the mounting platforms (4) is provided with sliding grooves (5).

3. The expandable interbody fusion device according to claim 2, characterized in that: Each of the two sets of support bases (1) has a first positioning platform (6) on its corresponding side, and a positioning frame (7) is installed on the surface of each first positioning platform (6).

4. The expandable interbody fusion device according to claim 3, characterized in that: Both sets of support bases (1) are fitted with a set of protective pads (2) on the outside. Each set of protective pads (2) has anti-slip protrusions (3) on the side where they are bonded to the support base (1).

5. The expandable interbody fusion device according to claim 4, characterized in that: The rotating rod (11) is fixedly installed on the outer arc surface inside the protective tube (9) with a limiting plate (12). The limiting plate (12) is installed in contact with the inner wall of the protective tube (9) and rotates. The hexagonal column (13) does not contact the inner wall of the protective tube (9), and the rotating rod (11) is installed in contact with the protective tube (9) and rotates.

6. The expandable interbody fusion device according to claim 5, characterized in that: The inner threaded tube (14) has two sets of second positioning platforms (15) symmetrically opened on the outer arc surface. Each set of second positioning platforms (15) has a set of mounting brackets (16) installed on its surface. One end of each set of support rods (17) is rotatably installed inside the mounting bracket (16), and the other end of each set of support rods (17) is rotatably installed inside the corresponding positioning bracket (7).

7. The expandable interbody fusion device according to claim 6, characterized in that: The positioning plate (18) is fixedly installed with a first storage tray (19) in the middle. The nuts of the connecting bolts (20) are completely stored inside the first storage tray (19). The side force plate (21) is installed with a second storage tray (22) in the middle corresponding to the plane detachment hinge (8). Each set of the second storage trays (22) is installed with a set of adjusting bolts (23), and the end of the adjusting bolts (23) is threaded onto one end of the plane detachment hinge (8).

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