Atlantoaxial lateral mass joint fusion cage

Abstract

The application belongs to the technical field of medical equipment, and discloses a atlantoaxial lateral mass joint fusion cage, which comprises a fusion cage shell, the inner wall of the fusion cage shell is slidably connected with a supporting block, the inner wall of the supporting block is rotatably connected with a rotating rod, the outer wall of the rotating rod is fixedly connected with a threaded rod, the outer wall of the fusion cage shell is threadedly connected with a positioning bolt, the outer wall of the supporting block is provided with a supporting mechanism, the supporting mechanism comprises a sliding block, the inner wall of the sliding block is hingedly connected with a supporting rod, and the outer wall of the fusion cage shell is fixedly connected with a fixed plate. Through cooperation of the fusion cage shell, the supporting block and other structures, the right side of the fusion cage shell can be kept in a closed state before the fusion cage shell is installed, the volume is small, the fusion cage shell is convenient to insert and install between atlantoaxial lateral mass joints, the overall structure is simple, the adaptability is high, use is convenient, and the process of installation of the fusion cage shell by medical staff is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically an atlantoaxial lateral mass joint fusion device. Background Technology

[0002] The atlantoaxial lateral mass fusion device is a medical device used in spinal surgery. It is specifically designed to stabilize the joint between the atlas and axis. Its main function is to help these vertebrae fuse properly after surgery by providing fixation and support, so as to restore the stability and function of the spine. The design of the fusion device allows the bones to grow and fuse together in a fixed position, thereby promoting healing and reducing postoperative instability.

[0003] Because patients' conditions vary during surgery, surgeons usually adjust the support angle of the atlantoaxial lateral mass fusion device before surgery to ensure that the device can accurately fit the lateral mass of the atlantoaxial joint and improve the success rate of bone fusion. However, the support angle of some existing atlantoaxial lateral mass fusion devices is generally fixed, and because part of them is in an open state, they are generally large in size, which makes it inconvenient to install and insert them between the lateral mass joints of the atlantoaxial joint. Therefore, the atlantoaxial lateral mass fusion device was proposed to address the above problems. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides an atlantoaxial lateral mass joint fusion device, which solves the problem of the existing technology being too bulky and inconvenient to install.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an atlantoaxial lateral mass joint fusion device, comprising a fusion device housing, a support block slidably connected to the inner wall of the fusion device housing, a rotating rod rotatably connected to the inner wall of the support block, a threaded rod fixedly connected to the outer wall of the rotating rod, a positioning bolt threadedly connected to the outer wall of the fusion device housing, and a support mechanism provided on the outer wall of the support block;

[0006] The support mechanism includes a slider, a support rod is hinged to the inner wall of the slider, a fixing plate is fixedly connected to the outer wall of the fusion device housing, a groove is opened on the outer wall of the fixing plate, and a fixing bolt is threaded to the inner wall of the slider.

[0007] Preferably, the threaded rod is threadedly connected to the inner wall of the fusion chamber housing, and the slider is fixedly connected to the outer wall of the support block.

[0008] Preferably, the threaded rod penetrates the outer wall of the fusion chamber housing, and the support rod is hinged to the inner wall of the fusion chamber housing.

[0009] Preferably, the slider contacts the inner wall of the fusion chamber housing, and the fixing bolt contacts the inner wall of the groove.

[0010] Preferably, the fixing plate contacts the outer wall of the slider, and the positioning bolt penetrates the outer wall of the fusion chamber housing.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] This invention, through the combination of structures such as the fusion device housing and the support block, allows the right side of the fusion device housing to remain closed before installation. Its small size facilitates insertion between the atlantoaxial lateral mass joints. After installation, the support block can be moved by rotating the threaded rod to open the right side of the fusion device housing vertically. It can be opened to multiple positions and fixed. The overall structure is simple, highly adaptable, and easy to use, thus facilitating the installation process of the fusion device housing for medical personnel.

[0013] This invention, through the combination of a slider and a support rod, allows the support rod to rotate during the movement of the support block. The position of the support rod is then fixed by a fixing bolt, providing auxiliary support to the upper and lower right side of the fusion chamber shell, making it more stable after being opened, thereby improving the strength and stability of the fusion chamber shell. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0015] Figure 2 This is a cross-sectional view of the fusion device housing, a schematic diagram of the threaded rod, and a support block structure of the present invention;

[0016] Figure 3 This is a cross-sectional view of the fusion device housing, a schematic diagram of the fixing plate and the support rod structure of the present invention;

[0017] Figure 4 This is a cross-sectional view of the fusion device housing, a schematic diagram of the support mechanism, and a schematic diagram of the positioning bolt structure of the present invention;

[0018] Figure 5 This is a cross-sectional view of the fusion device housing and a schematic diagram of the support mechanism structure of the present invention;

[0019] Figure 6 This is a cross-sectional view of the fusion device housing and a schematic diagram of the positioning bolt structure of the present invention;

[0020] Figure 7 This is a schematic diagram of the fusion device housing, positioning bolts, and threaded rod of the present invention.

[0021] In the diagram: 1. Fusion housing; 2. Positioning bolt; 3. Support mechanism; 301. Slider; 302. Support rod; 303. Fixing plate; 304. Slide groove; 305. Fixing bolt; 4. Rotating rod; 5. Threaded rod; 6. Support block. Detailed Implementation

[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] like Figures 1 to 7 As shown, the present invention provides an atlantoaxial lateral mass joint fusion device, including a fusion device housing 1. A support block 6 is slidably connected to the inner wall of the fusion device housing 1. A rotating rod 4 is rotatably connected to the inner wall of the support block 6. A threaded rod 5 is fixedly connected to the outer wall of the rotating rod 4. A positioning bolt 2 is threadedly connected to the outer wall of the fusion device housing 1. A support mechanism 3 is provided on the outer wall of the support block 6. The support mechanism 3 includes a slider 301. A support rod 302 is hinged to the inner wall of the slider 301. A fixing plate 303 is fixedly connected to the outer wall of the fusion device housing 1. A groove 304 is opened on the outer wall of the fixing plate 303. A fixing bolt 305 is threadedly connected to the inner wall of the slider 301.

[0024] The above-mentioned scheme employs the following: The fusion device housing 1 serves as the main body of the atlantoaxial lateral mass joint fusion device, made of polyetheretherketone (PEEK). PEEK possesses both toughness and elasticity to a certain extent, exhibits minimal interaction with human tissue, and its elastic modulus is close to that of human bone. After implantation, it better adapts to physiological activities, reduces stress shielding, and promotes bone growth and fusion. During the atlantoaxial lateral mass joint fusion surgery, the surgeon places the fusion device housing 1 at a suitable position between the atlantoaxial lateral mass joints. Then, two sets of positioning bolts 2 are used to fix the fusion device housing 1 to the lateral mass of the atlantoaxial joint. Next, the front opening of the fusion device housing 1 is opened from both the top and bottom sides to ensure that the angle of the fusion device housing 1 precisely matches the lateral mass of the atlantoaxial joint. The support mechanism 3, after the front opening of the fusion device housing 1 is completed, aligns the top and bottom sides from the middle, providing auxiliary support and making it more stable.

[0025] like Figures 1 to 7 As shown, the threaded rod 5 is threadedly connected to the inner wall of the fusion chamber housing 1, and the slider 301 is fixedly connected to the outer wall of the support block 6; the threaded rod 5 penetrates the outer wall of the fusion chamber housing 1, and the support rod 302 is hinged to the inner wall of the fusion chamber housing 1; the slider 301 contacts the inner wall of the fusion chamber housing 1, and the fixing bolt 305 contacts the inner wall of the slide groove 304; the fixing plate 303 contacts the outer wall of the slider 301, and the positioning bolt 2 penetrates the outer wall of the fusion chamber housing 1.

[0026] Using the above scheme: Before installing the fusion housing 1, its initial state is as follows: Figure 1As shown, the front end of the fusion device housing 1 is in a closed state. Its small overall size makes it easy to place between the atlantoaxial lateral mass joints. At this point, the positioning bolts 2 can be removed to place the fusion device housing 1, which can then be fixed in place using the positioning bolts 2. After fixing, when it is necessary to adjust the opening and closing angle of the front end of the fusion device housing 1 to correct the atlantoaxial kyphosis, the threaded rod 5 can be rotated, causing the rotating rod 4 to rotate synchronously, thus moving the support block 6. Because the support block 6 is slidably connected to the inner wall of the fusion device housing 1, it can only move laterally, allowing the support block 6 to move to the right. The oblique front end of the support block 6 presses against the opening of the fusion device housing 1, pushing it open vertically. Through the self-locking property of the threaded connection between the threaded rod 5 and the left inner wall of the fusion device housing 1, the position of the support block 6 can be fixed, keeping the right side of the fusion device housing 1 in an open state, thus supporting the patient's atlantoaxial joint. Furthermore, by rotating the threaded rod 5, the support block 6 can be moved to multiple positions and fixed, thereby adjusting the angle of the right side of the fusion device housing 1 to accommodate different patients' needs, providing greater flexibility.

[0027] Before rotating the threaded rod 5 to move the support block 6 to the right, the fixing bolt 305 needs to be loosened to disengage it from the slider 301, releasing the limiting position of the slider 301 against the fixing plate 303. This allows the slider 301 to move synchronously when the support block 6 moves, driving the support rod 302 to move synchronously. Since one end of the support rod 302 is hinged to the inner wall of the fusion chamber housing 1, when the right side of the fusion chamber housing 1 is pushed open by the support block 6, both sets of support rods 302 flip simultaneously. During the movement of the support block 6, the threaded hole of the slider 301 always corresponds to the position of the slide groove 304. When the slider reaches the appropriate position, the fixing bolt 305 can be passed through the slide groove 304 and tightened into the threaded hole of the slider 301 to limit the slider 301, thereby limiting the support rod 302 and maintaining the inclined support state. Figure 5 As shown, this provides auxiliary support, making the right side of the fusion device housing 1 more stable when it is opened. The device is small in size before installation and can be adjusted after being fixed to the atlantoaxial joint. It is convenient to install and adjust the angle, making it easy for medical staff to operate.

[0028] Working principle and usage process of this invention:

[0029] The fusion device housing 1 is made of polyetheretherketone (PEEK), which has both toughness and elasticity to a certain extent. It has less interaction with human tissues and its elastic modulus is close to that of human bones. After implantation, it can better adapt to the physiological activities of the human body, reduce stress shielding, and promote bone tissue growth and fusion. During the atlantoaxial lateral mass joint fusion surgery, the doctor places the fusion device housing 1 in a suitable position between the atlantoaxial lateral mass joints and then uses two sets of upper and lower positioning bolts 2 to fix the fusion device housing 1 to the lateral mass of the atlantoaxial joint.

[0030] Before installing the fusion cage housing 1, the right front end of the fusion cage housing 1 is in a closed state. Its overall volume is small and easy to place between the atlantoaxial lateral mass joints. At this time, the positioning bolt 2 can be removed to place the fusion cage housing 1. Then, the fusion cage housing 1 can be fixed by the positioning bolt 2. After fixing, when it is necessary to adjust the opening and closing tilt angle of the front end of the fusion cage housing 1 to correct the atlantoaxial joint kyphosis, the fixing bolt 305 can be loosened to disengage it from the slider 301, releasing the limitation between the slider 301 and the fixing plate 303. Then, the threaded rod 5 is rotated, which drives the rotating rod 4 to rotate synchronously, causing the support block 6 to move to the right. The right front end of the support block 6 is inclined to press against the opening of the fusion cage housing 1, pushing it open up and down. The self-locking property of the threaded rod 5 and the threaded connection with the left inner wall of the fusion cage housing 1 can fix the position of the support block 6, keeping the right side of the fusion cage housing 1 in an open state, thereby supporting the patient's atlantoaxial joint. By rotating the threaded rod 5, the support block 6 can be moved to multiple positions and fixed, thereby adjusting the right tilt angle of the fusion cage housing 1 to adapt to patients with different needs.

[0031] As the support block 6 moves, the slider 301 moves synchronously. When the right side of the fusion device housing 1 is pushed open by the support block 6, the upper and lower sets of support rods 302 flip simultaneously. When the support block 6 moves to the appropriate position, the fixing bolt 305 is passed through the slide groove 304 and tightened in the threaded hole of the slider 301 to limit the slider 301, thereby limiting the support rod 302 and maintaining the inclined support state. This can provide auxiliary support for the front end of the right side of the fusion device housing 1, making the right side of the fusion device housing 1 more stable when pushed open, thus completing the overall installation operation. The device has a small overall size before installation, which makes it easy for medical staff to insert it between the atlantoaxial lateral mass joints and then fix it. The angle can be adjusted after fixation. The operation of fixing and adjusting the angle is convenient, highly adaptable, more stable, and the convenient operation also improves the efficiency of the operation.

[0032] When the device needs to be reset to the corrected angle, medical staff can loosen the fixing bolt 305 to disengage it from the slider 301, releasing the limiting position between the slider 301 and the fixing plate 303. Then, rotate the threaded rod 5 in the opposite direction to drive the rotating rod 4 to rotate synchronously, causing the support block 6 to move to the left. During the movement, the upper and lower sides of the right side of the fusion chamber housing 1 remain in contact with the inclined plane and move towards the center simultaneously as the inclined plane moves. The support rod 302 flips, and the right side of the fusion chamber housing 1 gradually moves to the initial closed state. Then, through the self-locking property of the threaded connection between the threaded rod 5 and the inner wall of the left side of the fusion chamber housing 1, the support block 6 is fixed, keeping the right side of the fusion chamber housing 1 in the closed state. Figure 1 In the initial state shown, the fixing bolt 305 can be tightened to fix the slider 301 to the fixing plate 303, thereby resetting its correction angle.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An atlantoaxial lateral mass fusion cage, comprising a fusion cage housing (1), characterized in that: The fusion device housing (1) is the main body of the atlantoaxial lateral mass joint fusion device, and its material is polyetheretherketone. The inner wall of the fusion device housing (1) is slidably connected to a support block (6), and the inner wall of the support block (6) is rotatably connected to a rotating rod (4). The outer wall of the rotating rod (4) is fixedly connected to a threaded rod (5). Rotating the threaded rod (5) causes the rotating rod (4) to rotate synchronously, so that the support block (6) moves. The front end of the support block (6) is inclined to press against the opening of the fusion device housing (1) and push it open up and down. The outer wall of the fusion housing (1) is threaded with positioning bolts (2), and the outer wall of the support block (6) is provided with a support mechanism (3). The support mechanism (3) includes a slider (301), the inner wall of the slider (301) is hinged with a support rod (302), the outer wall of the fusion housing (1) is fixedly connected with a fixing plate (303), the outer wall of the fixing plate (303) is provided with a sliding groove (304), and the inner wall of the slider (301) is threaded with a fixing bolt (305).

2. The atlantoaxial lateral mass fusion device according to claim 1, characterized in that: The threaded rod (5) is threadedly connected to the inner wall of the fusion housing (1), and the slider (301) is fixedly connected to the outer wall of the support block (6).

3. The atlantoaxial lateral mass fusion device according to claim 1, characterized in that: The threaded rod (5) penetrates the outer wall of the fusion chamber housing (1), and the support rod (302) is hinged to the inner wall of the fusion chamber housing (1).

4. The atlantoaxial lateral mass fusion device according to claim 1, characterized in that: The slider (301) contacts the inner wall of the fusion housing (1), and the fixing bolt (305) contacts the inner wall of the groove (304).

5. The atlantoaxial lateral mass fusion device according to claim 1, characterized in that: The fixing plate (303) contacts the outer wall of the slider (301), and the positioning bolt (2) penetrates the outer wall of the fusion housing (1).

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