Multi-directional adjusting double-head spine fixing mechanism
By designing a multi-directional adjustment double-headed spinal fixation mechanism, the lack of multi-angle adjustment requirement of existing laminar hooks in complex spinal deformity surgery is solved, and multi-directional adjustment in the sagittal plane and the coronal plane is achieved, which improves the surgical Flexibility and success rate.
Patent Information
- Application Number
- CN202411742487.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-01-10
AI Technical Summary
The existing laminar hooks are difficult to meet the multi-angle adjustment needs in complex spinal deformities surgery during internal spinal fixation surgery, and are single-headed structures, which are difficult to fix and cannot flexibly anchor the laminar.
A multi-directional adjustment double-headed spinal fixation mechanism is designed, including a first nail sleeve, a second nail sleeve and a positioning member, which is capable of rotating about a first axis, sliding in the direction of extension of the first axis, and perpendicular to the first axis. The second axis of the second axis slides in the extension direction, and achieves multi-directional adjustment through the connecting shaft and the widening part, adapting to different spinal fixation scenarios.
Multi-directional adjustment in the sagittal and coronal planes is achieved, which improves the flexibility and accuracy of spinal fixation surgery, reduces damage to surrounding tissues, improves the success rate and quality of surgery, and is suitable for complex spinal deformities surgery.
Smart Images
Figure CN119279736A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of medical devices, and in particular to a multi-directional adjustable double-head spinal fixation mechanism. Background Art
[0002] Spinal fixation technology is a frequently used surgical technique in the clinical treatment of spinal diseases. Early spinal fixation surgery generally adopted a relatively simple method, such as cervical fusion with silver wire to fix the cervical spine. The development of spinal fixation technology is mainly to meet the needs of spinal correction, such as correction of scoliosis deformity through anterior or posterior approaches, multi-stage reduction of spinal deformity, etc. Commonly used fixation instruments in spinal fixation technology include lamina screws or lamina hooks.
[0003] The inventors found in their research that the lamina hooks in the prior art have at least the following disadvantages:
[0004] Laminar hooks are widely used in spinal fixation surgery. On the one hand, they can be used as an alternative fixation method for the slender cone of the pedicle, and on the other hand, they can flexibly anchor the lamina. However, the existing lamina hooks can generally only achieve limited adjustment in one direction, which is difficult to meet the multi-angle adjustment requirements in complex spinal deformity surgery; in addition, the existing lamina hooks are all short-arm structures, which are difficult to connect and fix with nail rods in the case of deformity. In addition, the existing lamina hooks are single-head structures and can only be fixed with a single rod. Summary of the invention
[0005] The objectives of the present invention include, for example, providing a multi-directionally adjustable double-head spinal fixation mechanism that can achieve multi-directional adjustment and meet the multi-angle adjustment requirements in complex spinal deformity surgery.
[0006] The embodiments of the present invention can be implemented as follows:
[0007] In a first aspect, the present invention provides a multi-directionally adjustable double-head spinal fixation mechanism, comprising:
[0008] A first nail sleeve, a second nail sleeve and a positioning piece, the first nail sleeve and the second nail sleeve are rotatably matched around a first axis, the first nail sleeve and the second nail sleeve are slidably matched in the extension direction of the first axis, and the first nail sleeve and the second nail sleeve are slidably matched in the extension direction of a second axis perpendicular to the first axis; the positioning piece is rotatably mounted on the first nail sleeve.
[0009] In an optional embodiment, the first nail sleeve includes a connected nail sleeve body and a connecting shaft, the second nail sleeve is rotatably matched with the connecting shaft, and the axis of the connecting shaft is parallel to the first axis; the positioning member is rotatably mounted on the nail sleeve body.
[0010] Based on the above solution, the second nail sleeve is positioned by the connecting shaft, the first nail sleeve and the second nail sleeve are convenient to assemble and fit tightly, and the connecting shaft also guides the second nail sleeve to move relative to the nail sleeve body, and the first nail sleeve and the second nail sleeve can be adjusted in multiple directions within a reasonable range. The adjustment is flexible and reliable.
[0011] In an optional embodiment, a widened portion is provided on the connecting shaft, and the widened portion is used to contact the second nail sleeve to limit the second nail sleeve from detaching from the connecting shaft along the extension direction of the first axis.
[0012] Based on the above scheme, when the first nail sleeve and the second nail sleeve slide in the axial direction of the connecting shaft, the second nail sleeve can contact the widened part, and the widened part limits the sliding distance of the second nail sleeve away from the first nail sleeve, thereby preventing the second nail sleeve from sliding off the connecting shaft when it is away from the first nail sleeve, and making adjustment more reliable.
[0013] In an optional embodiment, the widened portion is configured as a ball head and is located at the end of the connecting shaft.
[0014] Based on the above solution, the widened part is a ball head, the surface is spherical, there are no edges and corners, it is not easy to scratch the tissue, and it is safe and reliable when used.
[0015] In an optional embodiment, the nail sleeve body and the connecting shaft are configured as an integral structure.
[0016] Based on the above scheme, the nail sleeve body and the connecting shaft have high structural strength, long service life, and are easy to process and manufacture, eliminating the steps of separate processing and then assembling them together, reducing assembly errors and improving the accuracy of the cooperation between the two.
[0017] In an optional embodiment, the second nail sleeve is provided with a guide hole, the connecting shaft is inserted into the guide hole, the connecting shaft is rotatably matched with the guide hole, the connecting shaft is slidably matched with the guide hole in the extension direction of the first axis, and the connecting shaft is slidably matched with the guide hole in the extension direction of the second axis.
[0018] Based on the above scheme, by passing the connecting shaft through the guide hole, the connecting shaft can adaptively adjust its position relative to the guide hole under the guidance and limitation of the guide hole, and the adjustment range is controllable, making it more convenient to adjust the position of the first nail sleeve and the second nail sleeve.
[0019] In an optional embodiment, the positioning member is provided with a spherical joint, the first nail sleeve is provided with a spherical assembly hole, and the spherical joint is rotatably embedded in the spherical assembly hole.
[0020] Based on the above solution, the positioning member and the first nail sleeve have a wide rotation range and strong adaptability, which is conducive to the implementation of spinal internal fixation operations.
[0021] In an optional embodiment, the positioning member is configured as a lamina hook or a pedicle screw.
[0022] Based on the above scheme, the type of positioning parts can be flexibly selected to adapt to different spinal fixation scenarios. Among them, the function of the multi-directional adjustable double-head spinal fixation mechanism is to fix the nail rod to the vertebral body. There is a difference in the way the lamina hook and pedicle screw are used to fix the nail rod to the vertebral body. The pedicle screw can only be implanted in the pedicle of the vertebral body, while the lamina hook can be fixed in the lamina, transverse process and other bony parts. For deformed patients with narrow pedicles, pedicle screws cannot complete the fixation and need to be fixed with lamina hooks. In addition, compared with pedicle fixation, lamina hook fixation is a semi-rigid fixation method, which will have better clinical benefits for patients in some cases.
[0023] In an optional embodiment, both the first nail sleeve and the second nail sleeve are provided with a threaded fixing groove.
[0024] Based on the above solution, by providing a threaded fixing groove, it is convenient to fix the nail rod in the threaded fixing groove through a screw connection member, thereby achieving fixed cooperation between the first nail sleeve or the second nail sleeve and the nail rod.
[0025] In an optional embodiment, the multi-directional adjustable double-head spinal fixation mechanism further includes a pressure cover, which is fixed to the threaded fixing groove and contacts the positioning member to limit the positioning member from escaping from the first nail sleeve from the notch of the threaded fixing groove.
[0026] Based on the above scheme, after the positioning piece is installed on the first nail sleeve, the pressure cover is fixed in the threaded fixing groove. The positioning piece can rotate relative to the first nail sleeve, but will not fall out of the notch of the threaded fixing groove upward. The position of the positioning piece relative to the first nail sleeve is stable and reliable.
[0027] The beneficial effects of the embodiments of the present invention include, for example:
[0028] In summary, in the multi-directionally adjustable double-head spinal fixation mechanism provided by the present embodiment, the first nail sleeve and the second nail sleeve can both rotate around the first axis, and can also slide in the extension direction of the first axis, and can also slide in the extension direction of the second axis perpendicular to the first axis. In this way, when the first nail sleeve and the second nail sleeve are used for spinal fixation, they can rotate in the sagittal plane and can also slide left and right and up and down in the coronal plane. The first nail sleeve and the second nail sleeve can achieve multi-directional adjustment, thereby meeting the multi-angle adjustment requirements in complex spinal deformity surgery, facilitating the implementation of spinal fixation surgery, and improving the quality and success rate of the surgery. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0030] Figure 1 A cross-sectional schematic diagram of a first-angle view of the multi-directionally adjustable double-head spinal fixation mechanism provided by the present application;
[0031] Figure 2 A lateral schematic diagram of the multi-directionally adjustable double-head spinal fixation mechanism provided in the present application;
[0032] Figure 3 A cross-sectional schematic diagram of a second viewing angle of the multi-directionally adjustable double-head spinal fixation mechanism provided by the present application;
[0033] Figure 4 A schematic diagram of a first viewing angle of a first nail sleeve provided in the present application;
[0034] Figure 5 A schematic diagram of a second viewing angle of the first nail sleeve provided in the present application;
[0035] Figure 6 A schematic diagram of a first viewing angle of a second nail sleeve provided in the present application;
[0036] Figure 7 A schematic diagram of a second viewing angle of the second nail sleeve provided in the present application.
[0037] icon:
[0038] 001-first axis; 002-second axis; 100-first nail sleeve; 110-nail sleeve body; 111-first threaded fixing groove; 112-spherical assembly hole; 120-connecting shaft; 121-widening part; 130-pressure cover; 200-second nail sleeve; 201-second threaded fixing groove; 202-guide hole; 300-positioning piece; 310-spherical joint. DETAILED DESCRIPTION
[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.
[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0042] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0043] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.
[0044] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.
[0045] In the prior art, lamina hooks and lamina nails are frequently used in spinal fixation surgery. The lamina hook can be positioned at different positions of the spine. Compared with the lamina nail, the lamina hook has a more flexible fixation position and a wider range of applications. However, in the prior art, the lamina hook can only be adjusted in one direction, and the adjustment direction of the lamina hook is single, which cannot meet the multi-angle adjustment requirements in complex spinal deformity surgery.
[0046] In view of this, the designer provides a multi-directional adjustable double-head spinal fixation mechanism, which can achieve multi-directional and multi-angle adjustment, thereby meeting the multi-angle adjustment needs in complex spinal deformity surgery, and the surgery is flexible and reliable.
[0047] Please combine Figure 1-Figure 7 In this embodiment, the multi-directional adjustable double-head spinal fixation mechanism includes a first nail sleeve 100, a second nail sleeve 200 and a positioning member 300. The first nail sleeve 100 and the second nail sleeve 200 are rotatably matched around a first axis 001, the first nail sleeve 100 and the second nail sleeve 200 are slidably matched in the extension direction of the first axis 001, and the first nail sleeve 100 and the second nail sleeve 200 are slidably matched in the extension direction of a second axis 002 perpendicular to the first axis 001; the positioning member 300 is rotatably mounted on the first nail sleeve 100.
[0048] As described above, the use of the multi-directional adjustable double-head spinal fixation mechanism provided in this embodiment includes, for example:
[0049] Please combine Figure 1 It should be understood that as the second nail sleeve 200 rotates around the first nail sleeve 100, the extension direction of the second axis 002 will also change. When the insertion position needs to be adjusted, the second nail sleeve 200 can be rotated around the first axis 001 to adjust the angle of the second nail sleeve 200 in the sagittal plane. Then, according to the surgical requirements, the second nail sleeve 200 is translated in the extension direction of the first axis 001 and in the extension direction of the second axis system to achieve the best fixed position and support effect. In this way, the multi-directional adjustment function can greatly improve the flexibility and accuracy of the operation, reduce the damage to the surrounding tissues during the operation, and improve the success rate and quality of the operation.
[0050] That is to say, in the spinal fixation mechanism provided by the present embodiment, the first nail sleeve 100 and the second nail sleeve 200 can both rotate around the first axis 001, and can both slide in the extension direction of the first axis 001, and can both slide in the extension direction of the second axis 002 which is perpendicular to the first axis 001. In this way, when the first nail sleeve 100 and the second nail sleeve 200 are used for spinal fixation, they can rotate in the sagittal plane and can also slide left and right and up and down in the coronal plane. The first nail sleeve 100 and the second nail sleeve 200 can be adjusted in multiple directions, thereby meeting the multi-angle adjustment requirements in complex spinal deformity surgery, facilitating the implementation of spinal fixation surgery, and improving the quality and success rate of the surgery.
[0051] The following embodiments illustrate the details of the multi-directional adjustable double-head spinal fixation mechanism of the present application by way of examples.
[0052] Please combine Figure 1 , Figure 4 and Figure 5 In this embodiment, optionally, the first nail sleeve 100 includes a nail sleeve body 110, a connecting shaft 120 and a pressure cover 130. The nail sleeve body 110 and the connecting shaft 120 are connected, and the two can be set as an integrated structure. The pressure cover 130 is detachably connected to the nail sleeve body 110, and the pressure cover 130 cooperates with the nail sleeve body 110 to limit the position of the positioning member 300 and allow the positioning member 300 to rotate relative to the nail sleeve body 110.
[0053] It should be understood that the nail sleeve body 110 and the connecting shaft 120 are designed as an integrated structure, which has high structural strength and is easy to process and manufacture. It also eliminates the step of separately processing the nail sleeve body 110 and the connecting shaft 120 and then assembling them together, thereby improving manufacturing efficiency, reducing assembly errors, and improving processing and manufacturing accuracy.
[0054] Optionally, the nail sleeve body 110 is provided with a first threaded fixing groove 111, and the first threaded fixing groove 111 is a U-shaped groove. The two opposite groove walls of the first threaded fixing groove 111 are provided with threaded grooves. When the nail rod is fixed in the first threaded fixing groove 111, a screw connection can be used to screw the first threaded fixing groove 111 to press the nail rod in the first threaded fixing groove 111 to achieve the connection between the nail rod and the nail sleeve body 110.
[0055] At the same time, the nail sleeve body 110 is provided with a spherical assembly hole 112 connected to the first threaded fixing groove 111, the spherical assembly hole 112 penetrates the groove bottom wall of the first threaded fixing groove 111, and the spherical assembly hole 112 extends in a direction perpendicular to the horizontal plane. Wherein, the sagittal plane, the coronal plane and the horizontal plane are perpendicular to each other. The gland 130 is connected to the first threaded fixing groove 111, and the gland 130 can close the port of the spherical assembly hole 112 connected to the first threaded fixing groove 111, so as to avoid the positioning member 300 from the notch of the first threaded fixing groove 111. It should be understood that when installing the nail rod, the positioning member 300 is first fixed in the spherical assembly hole 112 by the gland 130, and then the nail rod is placed in the first threaded fixing groove 111, and then connected to the first threaded fixing groove 111 by a screw connector, and the nail rod is pressed in the first threaded fixing groove 111.
[0056] It should be noted that the connecting shaft 120 is located on one side of the groove side wall of the nail sleeve body 110 corresponding to the U-shaped groove. In addition, the end of the connecting shaft 120 away from the nail sleeve body 110 is provided with a widened portion 121, and the widened portion 121 can be a ball head, and the diameter of the widened portion 121 is greater than the diameter of the remaining position of the connecting shaft 120. It should be understood that the widened portion 121 can be integrally formed at the end of the connecting shaft 120, or the widened portion 121 can be set as a split structure with the connecting shaft 120, and the widened portion 121 can be removed from the connecting shaft 120 or fixed on the connector. Since the widened portion 121 is a ball head, the surface is smooth and it is not easy to scratch the tissue, thereby improving the safety of the operation.
[0057] In the present embodiment, optionally, the positioning member 300 can be set as a lamina hook or a pedicle screw. The lamina hook and the pedicle screw have different ways of fixing the nail rod on the vertebral body when used. The pedicle screw can only be implanted in the pedicle of the vertebral body, while the lamina hook can be fixed in the bony parts such as the lamina and the transverse process. For deformed patients with narrow pedicles, the pedicle screw cannot be fixed and needs to be fixed with the lamina hook. In addition, the lamina hook fixation is a semi-rigid fixation method relative to the pedicle fixation, which has better clinical benefits for patients in some cases.
[0058] It should be understood that the connection method of the lamina hook and the pedicle screw is consistent with the screw sleeve body 110. In this embodiment, the lamina hook is used as an example for description. A spherical joint 310 is provided at one end of the positioning member 300, and the spherical joint 310 is embedded in the spherical assembly hole 112. The spherical joint 310 and the spherical assembly hole 112 form a ball joint. The positioning member 300 has a wide range of rotation relative to the screw sleeve body 110 and is flexible to adjust.
[0059] It is worth noting that when assembling the lamina hook or the pedicle screw, the tip of the positioning member 300 can be inserted into the first threaded fixing groove 111 and out of the spherical assembly hole 112, so that the spherical joint 310 is embedded in the spherical assembly hole 112, and then the pressure cap 130 is connected to the first threaded fixing groove 111, and the pressure cap 130 contacts the top of the spherical joint 310 to limit the spherical joint 310 from coming out of the spherical assembly hole 112, thereby completing the installation of the positioning member 300 and the nail sleeve body 110. It should be understood that in other embodiments, the pressure cap 130 can be connected to other structures provided on the nail sleeve body 110, instead of being directly screwed to the first threaded fixing groove 111.
[0060] Please combine Figure 1 , Figure 6 and Figure 7 In this embodiment, optionally, the second nail sleeve 200 is provided with a second threaded fixing groove 201 and a guide hole 202. The guide hole 202 is located at one side of the groove bottom of the second threaded fixing groove 201, and the second threaded fixing groove 201 and the guide hole 202 are arranged at intervals. The second threaded fixing groove 201 is used to position the nail rod, and a screw connection member can be installed in the second threaded fixing groove 201, and the nail rod is fixed in the second threaded fixing groove 201 through the screw connection member. The guide hole 202 passes through the second nail sleeve 200 in the extension direction of the first axis 001, and the guide hole 202 is a strip hole, that is, the cross-sectional profile of the guide hole 202 is a rectangle. When the connecting shaft 120 is inserted into the guide hole 202, the connecting shaft 120 can not only rotate in the guide hole 202, but also slide on the first axis 001 and the second axis 002. The connecting shaft 120 is positioned by the guide hole 202 and guided by the guide hole 202, so that the first nail sleeve 100 and the second nail sleeve 200 can be adjusted within a reasonable range, and the adjustment operation is flexible and reliable.
[0061] In addition, a widened portion 121 is provided at the end of the connecting shaft 120. The widened portion 121 is located outside the guide hole 202 and on the side of the second nail sleeve 200 away from the first nail sleeve 100. The widened portion 121 can contact the second nail sleeve 200 when the second nail sleeve 200 moves away from the nail sleeve body 110 along the first axis 001, thereby limiting the second nail sleeve 200 from being separated from the connecting shaft 120 and improving the stability of the cooperation between the first nail sleeve 100 and the second nail sleeve 200.
[0062] The multi-directional adjustable double-head spinal fixation mechanism provided in this embodiment, the first nail sleeve 100 and the second nail sleeve 200 can be adjusted in multiple directions, with flexible adjustment and a wide adjustment range, and can adapt to the multi-angle adjustment requirements in complex spinal deformity surgery. The spinal fixation mechanism can adapt to various complex spinal surgeries, including but not limited to scoliosis correction, intervertebral disc replacement, spinal tumor resection, etc. At the same time, through multi-directional adjustment and precise positioning during the operation, the surgeon can better avoid important nerves and vascular structures during the operation and reduce damage to surrounding tissues. In addition, the diversity of the adjustment function may also reduce the repeated adjustment of the patient's posture during the operation, thereby shortening the operation time and reducing the intraoperative risk. Furthermore, the multi-directional adjustment function in the sagittal plane and the coronal plane ensures the stability of the lamina hook during the operation, which is not easy to loosen or shift. This is crucial for the stability of the spine during the postoperative rehabilitation stage, which can reduce the occurrence of postoperative complications and improve the quality of rehabilitation of patients.
[0063] It should be noted that at least one of the first nail sleeve 100, the second nail sleeve 200 and the positioning member 300 can be made of a biocompatible material such as titanium alloy or stainless steel, which not only ensures the long-term stability and safety of the lamina hook in the human body, but also has excellent corrosion resistance and mechanical strength. The lamina hook can withstand long-term biomechanical stress without deformation or damage, thereby extending the service life of the implant.
[0064] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims
1. A multi-directional adjustable double-head spinal fixation mechanism, characterized in that: include: A first nail sleeve (100), a second nail sleeve (200) and a positioning member (300), wherein the first nail sleeve (100) and the second nail sleeve (200) are rotatably matched around a first axis (001), the first nail sleeve (100) and the second nail sleeve (200) are slidably matched in the extension direction of the first axis (001), and the first nail sleeve (100) and the second nail sleeve (200) are slidably matched in the extension direction of a second axis (002) perpendicular to the first axis (001); and the positioning member (300) is rotatably mounted on the first nail sleeve (100).
2. The multi-directional adjustable double-head spinal fixation mechanism according to claim 1, characterized in that: The first nail sleeve (100) comprises a connected nail sleeve body (110) and a connecting shaft (120); the second nail sleeve (200) is rotatably matched with the connecting shaft (120); the axis of the connecting shaft (120) is parallel to the first axis (001); and the positioning member (300) is rotatably mounted on the nail sleeve body (110).
3. The multi-directional adjustable double-head spinal fixation mechanism according to claim 2, characterized in that: The connecting shaft (120) is provided with a widened portion (121), and the widened portion (121) is used to contact the second nail sleeve (200) to limit the second nail sleeve (200) from detaching from the connecting shaft (120) along the extension direction of the first axis (001).
4. The multi-directional adjustable double-head spinal fixation mechanism according to claim 3 is characterized in that: The widened portion (121) is configured as a ball head and is located at the end of the connecting shaft (120).
5. The multi-directional adjustable double-head spinal fixation mechanism according to claim 2, characterized in that: The nail sleeve body (110) and the connecting shaft (120) are arranged as an integral structure.
6. The multi-directional adjustable double-head spinal fixation mechanism according to claim 2, characterized in that: The second nail sleeve (200) is provided with a guide hole (202), the connecting shaft (120) is inserted into the guide hole (202), the connecting shaft (120) and the guide hole (202) are rotatably matched, the connecting shaft (120) and the guide hole (202) are slidably matched in the extension direction of the first axis (001), and the connecting shaft (120) and the guide hole (202) are slidably matched in the extension direction of the second axis (002).
7. The multi-directional adjustable double-head spinal fixation mechanism according to claim 1, characterized in that: The positioning member (300) is provided with a spherical joint (310), the first nail sleeve (100) is provided with a spherical assembly hole (112), and the spherical joint (310) is rotatably embedded in the spherical assembly hole (112).
8. The multi-directional adjustable double-head spinal fixation mechanism according to claim 1, characterized in that: The positioning member (300) is configured as a lamina hook or a pedicle screw.
9. The multi-directional adjustable double-head spinal fixation mechanism according to claim 1, characterized in that: The first nail sleeve (100) and the second nail sleeve (200) are both provided with a thread fixing groove.
10. The multi-directional adjustable double-head spinal fixation mechanism according to claim 9, characterized in that: The multi-directionally adjustable double-head spinal fixation mechanism also includes a pressure cover (130), which is fixed to the threaded fixing groove. The pressure cover (130) contacts the positioning member (300) to limit the positioning member (300) from escaping from the first nail sleeve (100) from the notch of the threaded fixing groove.