An expandable interconical fusion device

Abstract

This utility model discloses a telescopic intervertebral fusion device, including a first vertebral positioning plate and a second vertebral positioning plate. The outer end surface of the first vertebral positioning plate is provided with a positioning protrusion plate segment, and the side of the second vertebral positioning plate is provided with a recessed groove. The outer surface of the positioning protrusion plate segment of the first vertebral positioning plate is slidably connected to the inner surface of the recessed groove of the second vertebral positioning plate. The inner end surface of the sliding part of the second vertebral positioning plate is provided with a positioning protrusion. The outer surfaces of the upper and lower parts of the positioning protrusion plate segment are provided with positioning grooves. The outer surface of the positioning protrusion plate segment is slidably connected to the inner surface of the positioning groove. A positioning adjustment rod is fixedly connected to the outer end face of the positioning protrusion plate segment. Through the two-section structure of the first vertebral positioning plate and the second vertebral positioning plate, the device can be positioned and slidably supported by the positioning adjustment rod during installation, and the telescopic adjustment can be performed by twisting the locking nut. The adjustment structure is stable and the adjustment mechanism has low cost.

Description

Technical Field

[0001] This utility model relates to the field of telescopic intercondylar fusion devices, and more specifically, to a telescopic intercondylar fusion device. Background Technology

[0002] Interbody fusion cages are primarily used in spinal interbody fusion surgery, suitable for treating spinal diseases such as lumbar disc herniation, spinal stenosis, and congenital spinal disorders. They are implanted into the intervertebral space and filled with bone material to promote fusion and stability between the vertebrae, thereby helping patients recover. An interbody fusion cage is typically a hollow implant with central cavities on its sides, upper part, and lower part, which can be filled with autologous, allogeneic, or osteogenic materials. Currently, the most commonly used material is polyetheretherketone (PEEK), although carbon fiber reinforced polymers, titanium, and their alloys are also used. These materials have good biocompatibility and stability, making them safe for use in the human body.

[0003] Intervertebral fusion surgery is one of the most commonly used surgical procedures for treating this type of disease. The procedure is as follows: First, the intervertebral disc is removed to relieve spinal cord compression, i.e., "decompression"; then, intervertebral fusion material is implanted into the intervertebral space to restore intervertebral stability, i.e., "reconstruction". The clinical outcome of "reconstruction" mainly depends on the intervertebral fusion material. Common intervertebral fusion materials include ① autologous bone, ② allogeneic bone, and ③ intervertebral fusion cages. Using autologous bone inevitably leads to complications in the bone harvesting area (with an incidence rate as high as 25%), while using allogeneic bone avoids these complications but carries risks such as immune rejection and disease transmission.

[0004] Existing intercondylar fusion devices employ either an integrated fixed structure or a complex adjustment mechanism. For example, in the prior art, patent publication number CN1 12674916A discloses an intercondylar fusion device. This invention provides a large bone graft, achieves initial stability without the need for screws or plates, and has a higher probability of subsidence at the center of the vertebral body than at the edges. The center is filled with bone, and the surrounding area is supported by the fusion device, ensuring height, providing mechanical support, and reducing the probability of subsidence. This application employs a method of first implanting the fusion device, adjusting its size, shape, and position to match the lesion resection site, and then filling the U-shaped area with bone. This method allows for adjustment of different resection sizes and shapes.

[0005] The aforementioned patents employ a hinged structure, which is prone to damage at the hinge point when used in implants in the human body. The structure is unstable and the adjustment mechanism is costly. Utility Model Content

[0006] To address the problems existing in the prior art, the purpose of this utility model is to provide a telescopic intervertebral fusion device. It has a two-section structure with a first vertebral positioning plate and a second vertebral positioning plate. During installation, it can be positioned and slidably supported by a positioning adjustment rod, and its telescopic adjustment can be achieved by twisting the locking nut. Its adjustment structure is stable and the adjustment mechanism has low cost.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A telescopic intervertebral fusion device includes a first vertebral positioning plate and a second vertebral positioning plate. The outer surface of the first vertebral positioning plate has a positioning protrusion. The side of the second vertebral positioning plate has a recessed groove. The outer surface of the positioning protrusion of the first vertebral positioning plate is slidably connected to the inner surface of the recessed groove of the second vertebral positioning plate. The inner surface of the sliding part of the second vertebral positioning plate has a positioning protrusion. The upper and lower outer surfaces of the positioning protrusion have positioning grooves. The outer surface of the positioning protrusion is slidably connected to the inner surface of the positioning groove. A positioning adjustment rod is fixedly connected to the outer end face of the positioning protrusion. The positioning adjustment rod passes through the inner surface of the second vertebral positioning plate. The outer surface of the positioning adjustment rod is threaded with a first locking nut and a second locking nut. Through the two-section structure of the first and second vertebral positioning plates, during installation, positioning and sliding support can be achieved through the positioning adjustment rod, and telescopic adjustment can be performed by twisting the locking nut. The adjustment structure is stable and the adjustment mechanism has low cost.

[0009] Furthermore, the first locking nut is pressed and fixed to the inner end surface of one side of the second spinal positioning plate, and the second locking nut is pressed and fixed to the inner end surface of the other side of the second spinal positioning plate.

[0010] Furthermore, the outer surface of the second spinal positioning plate is provided with a first through hole, which is distributed at the four corners of the front of the outer surface of the second spinal positioning plate.

[0011] Furthermore, the outer surface of the second spinal positioning plate is provided with a second through hole, which is distributed at the four corners of the outer surface of the second spinal positioning plate.

[0012] Furthermore, the outer surface of the positioning protrusion is tightly fitted to the inner surface of the positioning groove.

[0013] Furthermore, the outer end face of the positioning adjustment rod is provided with a chamfered edge.

[0014] Furthermore, the first spinal positioning plate, the second spinal positioning plate, and the positioning adjustment rod are made of TC ELI titanium alloy material.

[0015] Compared with existing technologies, the advantages of this utility model are:

[0016] (1) With the two-section structure of the first vertebral positioning plate and the second vertebral positioning plate, during installation, the positioning adjustment rod can be used for positioning and sliding support, and the extension and retraction can be adjusted by twisting the locking nut. The adjustment structure is stable and the adjustment mechanism has low cost. Attached Figure Description

[0017] Figure 1 This is a first schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a second schematic diagram of the overall structure of this utility model;

[0019] Figure 3 This is a third schematic diagram of the overall structure of this utility model;

[0020] Figure 4 This is a schematic cross-sectional view of the overall structure of this utility model;

[0021] Figure 5 This is a partial structural diagram of the first spinal positioning plate of this utility model.

[0022] Explanation of the labels in the diagram:

[0023] 1 First spinal positioning plate, 2 Second spinal positioning plate, 3 Positioning protrusion plate section, 4 Positioning protrusion, 5 Positioning slide groove, 6 Positioning adjustment rod, 7 First locking nut, 8 Second locking nut, 9 First through hole, 10 Second through hole. Detailed Implementation

[0024] 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.

[0025] Example 1

[0026] Please see Figure 1-5A telescopic intervertebral fusion device includes a first spinal positioning plate 1 and a second spinal positioning plate 2. The outer surface of the first spinal positioning plate 1 is provided with a positioning protrusion plate segment 3. The side of the second spinal positioning plate 2 has a recessed groove. The outer surface of the positioning protrusion plate segment 3 of the first spinal positioning plate 1 is slidably connected to the inner surface of the recessed groove of the second spinal positioning plate 2. The inner surface of the sliding joint of the second spinal positioning plate 2 is provided with a positioning protrusion 4. Positioning grooves 5 are formed on the upper and lower outer surfaces of the positioning protrusion plate segment 3. The outer surface is slidably connected to the inner surface of the positioning groove 5. The outer end face of the positioning protrusion plate 3 is fixedly connected to the positioning adjustment rod 6. The positioning adjustment rod 6 is inserted through the inner surface of the second spine positioning plate 2. The outer surface of the positioning adjustment rod 6 is connected to the first locking nut 7 and the second locking nut 8 by thread. With the two-section structure of the first spine positioning plate and the second spine positioning plate, it can be positioned and slidably supported by the positioning adjustment rod during installation, and the extension and retraction can be adjusted by twisting the locking nut. Its adjustment structure is stable and the adjustment mechanism has low cost.

[0027] The first locking nut 7 is pressed and fixed to the inner end surface of one side of the second spine positioning plate 2, and the second locking nut 8 is pressed and fixed to the inner end surface of the other side of the second spine positioning plate 2; this facilitates the locking of the second spine positioning plate by the locking nuts on both sides, and it can be fixed to the first spine positioning plate 1. After adjustment, the fixing is convenient and firm, the adjustment is convenient, and the adjustment mechanism is simple.

[0028] The outer surface of the second spinal positioning plate 2 is provided with a first through hole 9, which is distributed at the four corners of the front of the outer surface of the second spinal positioning plate 2; this facilitates front fixation to the spine, and the spine is fixed by steel nails along the first through hole 9.

[0029] The outer surface of the second spinal positioning plate 2 is provided with a second through hole 10, which is distributed at the four corners of the outer surface of the second spinal positioning plate 2; this facilitates lateral fixation to the spine, and the spine is fixed by steel nails along the first through hole 9; the outer surface of the positioning protrusion 4 is tightly fitted to the inner surface of the positioning groove 5; the fit is tight; the engagement is tight, and when it slides, it can slide through the positioning protrusion 4 tightly fitted to the positioning groove 5, which can be positioned and adjusted;

[0030] The outer end face of the positioning adjustment rod 6 is provided with a chamfered ring; when the first locking nut 7 and the second locking nut 8 are sleeved on the positioning adjustment rod 6, they are sleeved through the chamfered ring, which facilitates the sleeved connection.

[0031] The first vertebral positioning plate 1, the second vertebral positioning plate 2, and the positioning adjustment rod 6 are made of TC4 ELI titanium alloy. TC4 ELI titanium alloy, also known as Ti-6Al-4V ELI, is an optimized version of TC4 titanium alloy. By reducing the content of impurity elements and strictly controlling the oxygen content, it has been developed into a damage-tolerant titanium alloy with high fracture toughness and low crack propagation rate. TC4 ELI titanium alloy is characterized by its simple composition and excellent forging and forming properties.

[0032] In use, a recessed groove is provided on the side of the second spinal positioning plate 2. The outer surface of the positioning protrusion plate segment 3 of the first spinal positioning plate 1 is slidably connected to the inner surface of the recessed groove of the second spinal positioning plate 2. A positioning protrusion 4 is provided on the inner end surface of the sliding part of the second spinal positioning plate 2. Positioning grooves 5 are provided on the outer surfaces of the upper and lower parts of the positioning protrusion plate segment 3. The outer surface of the positioning protrusion 4 is slidably connected to the inner surface of the positioning groove 5, which facilitates the positioning and sliding installation of the first spinal positioning plate 1 and the second spinal positioning plate 2. It can be telescopically slidably adjusted. A positioning adjustment rod 6 is fixedly connected to the end face of the second spine positioning plate 2. The positioning adjustment rod 6 passes through the inner surface of the second spine positioning plate 2. The outer surface of the positioning adjustment rod 6 is connected to a first locking nut 7 and a second locking nut 8 by threads. The first locking nut 7 is pressed and fixed to the inner end surface of one side of the second spine positioning plate 2, and the second locking nut 8 is pressed and fixed to the inner end surface of the other side of the second spine positioning plate 2. This facilitates the locking of the second spine positioning plate by the locking nuts on both sides. It can be fixed to the first spine positioning plate 1. After adjustment, the fixation is convenient and firm, and the adjustment mechanism is simple.

Claims

1. A telescopic intervertebral fusion device, comprising a first spinal positioning plate (1) and a second spinal positioning plate (2), characterized in that: The outer end surface of the first spinal positioning plate (1) is provided with a positioning protrusion plate section (3), and the side of the second spinal positioning plate (2) is provided with a recessed groove. The outer surface of the positioning protrusion plate section (3) of the first spinal positioning plate (1) is slidably connected to the inner surface of the recessed groove of the second spinal positioning plate (2). The inner end surface of the sliding part of the second spinal positioning plate (2) is provided with a positioning protrusion (4). The upper and lower outer surfaces of the positioning protrusion plate section (3) are provided with positioning grooves (5). The outer surface of the positioning protrusion (4) is slidably connected to the inner surface of the positioning groove (5). The outer end face of the positioning protrusion plate section (3) is fixedly connected with a positioning adjustment rod (6). The positioning adjustment rod (6) is inserted through the inner surface of the second spinal positioning plate (2). The outer surface of the positioning adjustment rod (6) is connected with a first locking nut (7) and a second locking nut (8) by thread.

2. The telescopic intercone fusion device according to claim 1, characterized in that: The first locking nut (7) is pressed and fixed on one side of the inner end surface of the second spine positioning plate (2), and the second locking nut (8) is pressed and fixed on the other side of the inner end surface of the second spine positioning plate (2).

3. The telescopic intercone fusion device according to claim 1, characterized in that: The second spinal positioning plate (2) has a first through hole (9) on its outer surface. The first through hole (9) is distributed at the four corners of the front of the outer surface of the second spinal positioning plate (2).

4. A telescopic intercone fusion device according to claim 1, characterized in that: The second spinal positioning plate (2) has a second through hole (10) on its outer surface. The second through holes (10) are distributed at the four corners of the outer surface of the second spinal positioning plate (2).

5. A telescopic intercone fusion device according to claim 1, characterized in that: The outer surface of the positioning protrusion (4) is closely attached to the inner surface of the positioning groove (5).

6. A telescopic intercone fusion device according to claim 1, characterized in that: The outer end face of the positioning adjustment rod (6) is provided with a chamfer.

7. A telescopic intercone fusion device according to claim 1, characterized in that: The first spinal positioning plate (1), the second spinal positioning plate (2), and the positioning adjustment rod (6) are made of TC4 ELI titanium alloy.

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