Atlantoaxial lateral mass joint fusion cage

Abstract

The invention belongs to the technical field of medical equipment, and discloses an atlantoaxial lateral mass joint fusion cage which comprises a fusion cage shell, a supporting block is slidably connected to the inner wall of the fusion cage shell, a rotating rod is rotatably connected to the inner wall of the supporting block, and a threaded rod is fixedly connected to the outer wall of the rotating rod. A positioning bolt is in threaded connection with the outer wall of the fusion cage shell, a supporting mechanism is arranged on the outer wall of the supporting block and comprises a sliding block, a supporting rod is hinged to the inner wall of the sliding block, and a fixing plate is fixedly connected to the outer wall of the fusion cage shell. 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 size is small, the fusion cage is conveniently inserted between atlantoaxial lateral mass joints to be installed, the overall structure is simple, adaptability is high, use is convenient, and the fusion cage is suitable for popularization and application. And therefore, the process of mounting the fusion cage shell by medical staff is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of medical equipment, in particular to an atlantoaxial lateral mass arthrodesis device. Background Art

[0002] The atlantoaxial lateral mass arthrodesis cage is a medical device used in spinal surgery, 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 to restore the stability and function of the spine. The design of the fusion cage allows the bones to grow and fuse into one in a fixed position, thereby promoting healing and reducing postoperative instability.

[0003] Since the conditions of each patient vary during surgery, surgeons usually adjust the support angle of the device before using the atlantoaxial lateral mass arthrodesis device for surgery to ensure that the device can accurately fit the lateral masses of the atlantoaxial vertebrae and improve the success rate of bone fusion. However, the support angle of some existing atlantoaxial lateral mass arthrodesis devices is generally fixed, and since a portion of the device is in an expanded state, the device is generally large in size, which makes it inconvenient to install and insert the device between the patient's atlantoaxial lateral mass joints. Therefore, an atlantoaxial lateral mass arthrodesis device is proposed to address the above problems. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides an atlantoaxial lateral mass arthrodesis device, which solves the problem that the prior art is large in size and inconvenient to install.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an atlantoaxial lateral mass arthrodesis device, comprising a device shell, the inner wall of which is slidably connected to a support block, the inner wall of which is rotatably connected to a rotating rod, the outer wall of which is fixedly connected to a threaded rod, the outer wall of which is threadedly connected to a positioning bolt, and the outer wall of which is provided with a supporting mechanism;

[0006] The support mechanism comprises a slider, the inner wall of the slider is hinged with a support rod, the outer wall of the fusion device shell is fixedly connected with a fixing plate, the outer wall of the fixing plate is provided with a sliding groove, and the inner wall of the slider is threadedly connected with a fixing bolt.

[0007] Preferably, the threaded rod is threadedly connected to the inner wall of the fusion device shell, and the sliding block is fixedly connected to the outer wall of the support block.

[0008] Preferably, the threaded rod passes through the outer wall of the fusion device shell, and the support rod is hinged to the inner wall of the fusion device shell.

[0009] Preferably, the sliding block contacts the inner wall of the fusion device shell, and the fixing bolt contacts the inner wall of the sliding groove.

[0010] Preferably, the fixing plate contacts the outer wall of the sliding block, and the positioning bolt passes through the outer wall of the fusion device shell.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention cooperates with the fusion device shell and the support block, so that before installing the fusion device shell, the right side of the fusion device shell can be kept in a closed state, and the volume is small, so it is convenient to insert between the atlantoaxial lateral mass joints for installation. After installation, the support block can be driven to move by rotating the threaded rod to push the right side of the fusion device shell up and down, and it can be pushed to multiple positions and fixed. The overall structure is simple, the adaptability is high, and the use is relatively convenient, thereby facilitating the process of medical staff to install the fusion device shell.

[0013] The present invention cooperates with structures such as a slider and a support rod. During the movement of the support block, the slider can drive the support rod to flip, and the position of the support rod is fixed by a fixing bolt, which has an auxiliary supporting effect on the upper and lower sides of the right side of the fusion device shell, making it more stable after being pushed open, thereby improving the strength and stability of the fusion device shell. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 It is a schematic diagram of the cross section of the fusion device shell, the threaded rod, and the support block structure of the present invention;

[0016] Figure 3 It is a schematic diagram of the cross section of the fusion device shell, the fixing plate and the support rod structure of the present invention;

[0017] Figure 4 It is a schematic diagram of the cross section of the fusion device shell, the supporting mechanism, and the positioning bolt structure of the present invention;

[0018] Figure 5 It is a schematic diagram of the cross section of the fusion device shell and the supporting mechanism structure of the present invention;

[0019] Figure 6 It is a schematic diagram of the cross section of the fusion device shell and the positioning bolt structure of the present invention;

[0020] Figure 7 It is a schematic diagram of the structure of the fusion device shell, positioning bolts and threaded rods of the present invention.

[0021] In the figure: 1. fusion device shell; 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 DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 shell 1, the inner wall of the fusion device shell 1 is slidably connected to a support block 6, 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, the outer wall of the fusion device shell 1 is threadedly connected to a positioning bolt 2, the outer wall of the support block 6 is provided with a supporting mechanism 3, the supporting mechanism 3 includes a slider 301, the inner wall of the slider 301 is hinged to a support rod 302, the outer wall of the fusion device shell 1 is fixedly connected to 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 threadedly connected to a fixing bolt 305.

[0024] The above scheme is adopted: the fusion device shell 1 is the main body of the atlantoaxial lateral mass joint fusion device, and its material is polyetheretherketone, which has both toughness and elasticity to a certain extent, and has little interaction with human tissue. 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 is conducive to the growth and fusion of bone tissue; when performing atlantoaxial lateral mass joint fusion surgery, the doctor will place the fusion device shell 1 at a suitable position between the atlantoaxial lateral mass joints, and then use the upper and lower sets of positioning bolts 2 to fix the fusion device shell 1 and the atlantoaxial lateral mass, and then push open the upper and lower sides of the front end opening of the fusion device shell 1 to ensure that the angle of the fusion device shell 1 can accurately adapt to the atlantoaxial lateral mass; through the support mechanism 3, after the front end of the fusion device shell 1 is pushed open, the upper and lower sides can be aligned from the middle to play an auxiliary support effect, 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 device shell 1, and the slider 301 is fixedly connected to the outer wall of the support block 6; the threaded rod 5 passes through the outer wall of the fusion device shell 1, and the support rod 302 is hinged to the inner wall of the fusion device shell 1; the slider 301 contacts the inner wall of the fusion device shell 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 passes through the outer wall of the fusion device shell 1.

[0026] Adopting the above scheme: before installing the fusion device shell 1, its initial state is as follows: Figure 1As shown, the front end of the fusion device shell 1 is in a closed state, and the overall volume is small, which is easy to be placed between the atlantoaxial lateral mass joints. At this time, the positioning bolt 2 can be removed to place the fusion device shell 1, and then the fusion device shell 1 can be fixed by the positioning bolt 2; after the fixation is completed, when it is necessary to adjust the opening and closing inclination angle of the front end of the fusion device shell 1 to correct the kyphosis of the atlantoaxial joint, the threaded rod 5 can be rotated to drive the rotating rod 4 to rotate synchronously, so that the support block 6 moves. Since the support block 6 is slidably connected to the inner wall of the fusion device shell 1, it can only move laterally, so that the support block 6 can be moved to the right side, and the front end of the support block 6 is pressed against the opening of the fusion device shell 1 by the inclined surface, and it is pushed up and down. The self-locking property of the threaded connection between the threaded rod 5 and the left inner wall of the fusion device shell 1 can fix the position of the support block 6, so that the right side of the fusion device shell 1 is kept in an open state, and the atlantoaxial joint of the patient can be supported; and the support block 6 can be moved to multiple positions and fixed by rotating the threaded rod 5, so that the angle of the right side inclination of the fusion device shell 1 can be adjusted to adapt to patients with different needs, which is more flexible.

[0027] The fixing bolt 305 is required to be loosened to make it disengage from the slider 301, and the limit of the slider 301 and the fixing plate 303 is released, so that the slider 301 can move synchronously when the support block 6 moves, thereby 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 device shell 1, when the right side of the fusion device shell 1 is squeezed and pushed open by the support block 6, the upper and lower groups of support rods 302 flip over at the same time, and the threaded hole of the slider 301 always corresponds to the position of the slide groove 304 during the movement of the support block 6; when it moves to a suitable position, the fixing bolt 305 can be 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. Figure 5 As shown, it can play an auxiliary supporting role, making the right side of the fusion device shell 1 more stable, and the device is small in size before installation, and the angle can be adjusted after being fixed to the atlantoaxial joint. It is convenient to install and adjust the angle, and is easy for medical staff to operate.

[0028] The working principle and use process of the present invention:

[0029] The fusion device shell 1 is made of polyetheretherketone, which has both toughness and elasticity to a certain extent, has little interaction with human tissue, and has an elastic modulus close to that of human bones. After implantation, it can better adapt to the physiological activities of the human body, reduce stress shielding, and is conducive to the growth and fusion of bone tissue; when performing atlantoaxial lateral mass joint fusion surgery, the doctor places the fusion device shell 1 at 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 shell 1 to the atlantoaxial lateral mass.

[0030] Before installing the fusion device shell 1, the front end of the right side of the fusion device shell 1 is in a closed state, and the overall volume is small, which is easy to be placed between the atlantoaxial lateral mass joints. At this time, the positioning bolt 2 can be removed to place the fusion device shell 1, and then the fusion device shell 1 can be fixed by the positioning bolt 2; after the fixation is completed, when it is necessary to adjust the opening and closing inclination angle of the front end of the fusion device shell 1 to correct the kyphosis of the atlantoaxial joint, the fixing bolt 305 can be loosened to make it disengage from the slider 301, release the limit of the slider 301 and the fixing plate 303, and then rotate the threaded rod 5 to drive the rotating rod 4 to rotate synchronously, so that the support block 6 moves to the right side, and the front end of the right side of the support block 6 is inclined to squeeze the opening of the fusion device shell 1 to push it up and down, and the self-locking property of the threaded connection between the threaded rod 5 and the left inner wall of the fusion device shell 1 can fix the position of the support block 6, so that the right side of the fusion device shell 1 remains in a pushed-open state, thereby supporting the patient's atlantoaxial joint, and the support block 6 can be moved to multiple positions and fixed by rotating the threaded rod 5, so that the angle of the right side inclination of the fusion device shell 1 can be adjusted to adapt to patients with different needs.

[0031] When the support block 6 moves, the slider 301 moves synchronously. When the right side of the fusion device shell 1 is squeezed and pushed open by the support block 6, the upper and lower support rods 302 are flipped at the same time. When the support block 6 moves to a suitable 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 an inclined support state. This can provide auxiliary support for the front end of the right side of the fusion device shell 1, making the right side of the fusion device shell 1 more stable, and the overall installation operation can be completed. The overall volume of the device is small before installation, which is convenient for medical staff to insert between the atlantoaxial lateral mass joints and then fix them, and the angle can be adjusted after fixation. The operations of fixing and adjusting the angles are relatively convenient, highly adaptable, more stable, and convenient operation also improves the efficiency of the operation.

[0032] When it is necessary to reset the device to correct the angle, the medical staff can loosen the fixing bolt 305 to disengage the slider 301, release the limit of the slider 301 and the fixing plate 303, and then rotate the threaded rod 5 in the opposite direction to drive the rotating rod 4 to rotate synchronously, so that the support block 6 moves to the left. During the movement, the upper and lower sides of the right side of the fusion shell 1 keep in contact with the inclined surface and move toward the middle at the same time as the inclined surface moves. The support rod 302 flips over, and the right side of the fusion shell 1 gradually moves to the initial closed state. After that, the threaded rod 5 is self-lockingly connected to the inner wall of the left side of the fusion shell 1 through the threaded connection, so that the support block 6 is fixed to keep the right side of the fusion shell 1 closed. When it is closed to Figure 1 In the initial state shown, the fixing bolt 305 can be tightened to fix the slider 301 and the fixing plate 303, so that the angle can be corrected and reset.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An atlantoaxial lateral mass arthrodesis device, comprising a device shell (1), characterized in that: The inner wall of the fusion device shell (1) is slidably connected to a support block (6), 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), the outer wall of the fusion device shell (1) is threadedly connected to a positioning bolt (2), and the outer wall of the support block (6) is provided with a supporting mechanism (3); The support mechanism (3) comprises a slider (301), the inner wall of the slider (301) is hinged with a support rod (302), the outer wall of the fusion device shell (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 threadedly connected with a fixing bolt (305).

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

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

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

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

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