Multi-directional adjusting double-head spine fixing mechanism

Abstract

The utility model provides a multi-directional adjusting double-head spine fixing mechanism, which relates to the field of medical instruments and comprises 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 extending direction of the first axis, and the first nail sleeve and the second nail sleeve are slidably matched in the extending direction of a second axis perpendicular to the first axis; the positioning piece is rotatably installed on the first nail sleeve. According to the spine fixing mechanism, through the reasonable design of the first nail sleeve and the second nail sleeve, multi-direction adjustment can be achieved, and the multi-angle adjustment requirement in a complex spine malformation operation can be met.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and more specifically, to a multi-directional adjustable double-headed spinal fixation mechanism. Background Technology

[0002] Spinal internal fixation is a frequently used surgical technique in the clinical treatment of spinal diseases. Early spinal internal fixation surgeries generally employed simpler methods, such as cervical fusion surgery using silver wire to fix the cervical spine. The development of spinal internal fixation techniques has primarily been driven by the need for spinal correction, such as the correction of scoliosis via anterior or posterior approaches, and multi-stage reduction of spinal deformities. Commonly used fixation devices in spinal internal fixation include laminectomy screws or laminectomy hooks.

[0003] The inventors discovered in their research that existing laminar hooks have at least the following drawbacks:

[0004] Lamina hooks are widely used in spinal internal fixation surgery. On one hand, they serve as an alternative fixation method for the slender pedicle screws; on the other hand, they allow for flexible anchoring of the lamina. However, existing lamina hooks generally only allow for limited adjustment in one direction, making it difficult to meet the multi-angle adjustment needs in complex spinal deformity surgeries. Furthermore, existing lamina hooks are all short-arm structures, making connection and fixation with screws / rods difficult in deformity cases. Additionally, existing lamina hooks are single-headed structures, allowing fixation only with a single rod. Utility Model Content

[0005] The purpose of this invention includes, for example, providing a multi-directional adjustable double-headed spinal fixation mechanism that can achieve multi-directional adjustment and meet the multi-angle adjustment needs in complex spinal deformity surgery.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, this utility model provides a multi-directional adjustable double-headed spinal fixation mechanism, comprising:

[0008] A first nail sleeve, a second nail sleeve, and a positioning element are provided. The first nail sleeve and the second nail sleeve are rotatably engaged about a first axis, slidably engaged in the extension direction of the first axis, and slidably engaged in the extension direction of a second axis perpendicular to the first axis. The positioning element 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 engaged 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 scheme, the second nail sleeve is positioned by relying on the connecting shaft. The first and second nail sleeves are easy to assemble and fit tightly. Furthermore, the connecting shaft also guides the movement of the second nail sleeve relative to the nail sleeve body. The first and second nail sleeves can be adjusted in multiple directions within a reasonable range. The adjustment is flexible and reliable.

[0011] In an optional embodiment, the connecting shaft is provided with a widening portion for contacting the second nail sleeve to restrict the second nail sleeve from disengaging from the connecting shaft along the extension direction of the first axis.

[0012] Based on the above solution, when the first and second nail sleeves slide axially on the connecting shaft, the second nail sleeve can contact the widened part. The widened part limits the distance the second nail sleeve can slide away from the first nail sleeve, preventing the second nail sleeve from slipping off the connecting shaft when it moves away from the first nail sleeve, making the adjustment more reliable.

[0013] In an optional embodiment, the widened portion is configured as a ball head and located at the end of the connecting shaft.

[0014] Based on the above solution, the widened part is a ball head with a spherical surface, without sharp edges, making it less likely to scratch tissues and ensuring safe and reliable use.

[0015] In an optional embodiment, the nail sleeve body and the connecting shaft are configured as an integral structure.

[0016] Based on the above solution, the nail sleeve body and the connecting shaft have high structural strength, long service life, and are easy to process and manufacture. This eliminates the step of processing them separately and then assembling them together, reduces assembly errors, and improves the accuracy of their fit.

[0017] In an optional embodiment, the second nail sleeve is provided with a guide hole, the connecting shaft passes through the guide hole, the connecting shaft and the guide hole are rotatably engaged, the connecting shaft and the guide hole are slidably engaged in the extension direction of the first axis, and the connecting shaft and the guide hole are slidably engaged in the extension direction of the second axis.

[0018] Based on the above solution, by inserting the connecting shaft into 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 and second nail sleeves.

[0019] In an optional embodiment, the positioning member is provided with a spherical connector, and the first nail sleeve is provided with a spherical assembly hole, wherein the spherical connector is rotatably embedded in the spherical assembly hole.

[0020] Based on the above scheme, the positioning component and the first nail sleeve have a wide range of rotation and strong adaptability, which is conducive to carrying out spinal internal fixation operations.

[0021] In an optional embodiment, the positioning element is configured as a laminar hook or a pedicle screw.

[0022] Based on the above scheme, the type of positioning device can be flexibly selected to adapt to different spinal fixation scenarios. The multi-directional adjustable dual-head spinal fixation mechanism serves to fix the pedicle screw to the vertebral body. The methods of fixing the pedicle screw to the vertebral body differ between laminae and pedicle screws. Pedicle screws can only be implanted at the pedicle of the vertebral body, while laminae can be fixed to bony locations such as the lamina and transverse processes. For patients with deformities and narrowed pedicles, pedicle screws cannot achieve fixation, requiring the use of laminae. Furthermore, laminae fixation, compared to pedicle fixation, is a semi-rigid fixation method, which may offer better clinical benefits for some patients.

[0023] In an optional embodiment, both the first nail sleeve and the second nail sleeve are provided with threaded fixing grooves.

[0024] Based on the above scheme, by setting a threaded fixing groove, it is convenient to fix the nail bar in the threaded fixing groove through the screw connector, so as to achieve a fixed fit between the first nail sleeve or the second nail sleeve and the nail bar.

[0025] In an optional embodiment, the multi-directional adjustable dual-head spinal fixation mechanism further includes a pressure cap, which is fixed to the threaded fixing groove and contacts the positioning member to restrict the positioning member from dislodging from the opening of the threaded fixing groove and exiting the first nail sleeve.

[0026] Based on the above scheme, after the positioning component is installed on the first nail sleeve, the pressure cap is fixed in the threaded fixing groove. The positioning component can rotate relative to the first nail sleeve, but will not come out of the groove opening of the threaded fixing groove upwards. The position of the positioning component relative to the first nail sleeve is stable and reliable.

[0027] The beneficial effects of this utility model embodiment include, for example:

[0028] In summary, the multi-directional adjustable dual-head spinal fixation mechanism provided in this embodiment allows both the first and second nail sleeves to rotate around a first axis, slide along the extension direction of the first axis, and slide along the extension direction of a second axis perpendicular to the first axis. Thus, when the first and second nail sleeves are applied to spinal fixation, they can rotate in the sagittal plane and slide left and right and up and down in the coronal plane. The first and second nail sleeves can achieve multi-directional adjustment, thereby meeting the multi-angle adjustment needs in complex spinal deformity surgery, facilitating spinal fixation surgery, and improving surgical quality and success rate. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A first-view sectional schematic diagram of the multi-directional adjustable double-headed spinal fixation mechanism provided in this application;

[0031] Figure 2 A lateral schematic diagram of the multi-directional adjustable double-headed spinal fixation mechanism provided in this application;

[0032] Figure 3 A cross-sectional schematic diagram from a second perspective of the multi-directional adjustable double-headed spinal fixation mechanism provided in this application;

[0033] Figure 4 A schematic diagram of the first view of the first nail sleeve provided in this application;

[0034] Figure 5 A schematic diagram of the second perspective of the first nail sleeve provided in this application;

[0035] Figure 6 A schematic diagram from a first-view perspective of the second nail sleeve provided in this application;

[0036] Figure 7 A schematic diagram of the second view of the second nail sleeve provided in this application.

[0037] icon:

[0038] 001-First axis; 002-Second axis; 100-First nail sleeve; 110-Nailing sleeve body; 111-First threaded fixing groove; 112-Spherical assembly hole; 120-Connecting shaft; 121-Wide section; 130-Pressure cap; 200-Second nail sleeve; 201-Second threaded fixing groove; 202-Guide hole; 300-Positioning component; 310-Spherical joint. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0044] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0045] In existing technologies, laminectomy hooks and laminectomy screws are frequently used in spinal fixation surgery. Laminectomy hooks can be positioned at different locations on the spine, offering greater flexibility in fixation and a wider range of applications compared to laminectomy screws. However, existing technologies only allow for adjustment in one direction, limiting their adjustment capabilities and making them unsuitable for the multi-angle adjustment needs of complex spinal deformity surgeries.

[0046] In view of this, the designers have provided a multi-directional adjustable dual-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, making the surgery flexible and reliable.

[0047] Please combine Figures 1-7In this embodiment, the multi-directional adjustable double-headed 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 engaged around a first axis 001, slidably engaged in the extension direction of the first axis 001, and slidably engaged 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 multi-directional adjustable dual-head spinal fixation mechanism provided in this embodiment can be used in the following ways, 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 also changes. When it is necessary to adjust the insertion position, the second nail sleeve 200 can first be rotated around the first axis 001 to adjust its angle in the sagittal plane. Then, according to the surgical requirements, the second nail sleeve 200 can be translated in the extension direction of the first axis 001 and in the extension direction of the second axis system to achieve the best fixation position and support effect. In this way, the multi-directional adjustment function can greatly improve the flexibility and accuracy of the operation, reduce damage to surrounding tissues during the operation, and improve the success rate and quality of the operation.

[0050] In other words, the spinal fixation mechanism provided in this embodiment allows the first nail sleeve 100 and the second nail sleeve 200 to rotate around the first axis 001, slide in the extension direction of the first axis 001, and slide in the extension direction of the second axis 002 perpendicular to the first axis 001. Thus, when the first nail sleeve 100 and the second nail sleeve 200 are applied to spinal fixation, they can rotate in the sagittal plane and slide left and right and up and down in the coronal plane. The first nail sleeve 100 and the second nail sleeve 200 can achieve multi-directional adjustment, thereby meeting the multi-angle adjustment requirements in complex spinal deformity surgery, facilitating spinal fixation surgery, and improving surgical quality and success rate.

[0051] The following embodiments illustrate the details of the multi-directional adjustable dual-head spinal fixation mechanism of this application by way of example.

[0052] Please combine Figure 1 , Figure 4 and Figure 5In this embodiment, optionally, the first nail sleeve 100 includes a nail sleeve body 110, a connecting shaft 120, and a pressure cap 130. The nail sleeve body 110 and the connecting shaft 120 are connected and can be configured as a single unit. The pressure cap 130 is detachably connected to the nail sleeve body 110, and the pressure cap 130 cooperates with the nail sleeve body 110 to restrict the position of the positioning member 300 while allowing 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 integral structure, which has high structural strength, is easy to process and manufacture, and eliminates the step of processing the nail sleeve body 110 and the connecting shaft 120 separately and then assembling them together, thereby improving manufacturing efficiency, reducing assembly errors, and improving the precision of processing and manufacturing.

[0054] Optionally, the nail sleeve body 110 is provided with a first threaded fixing groove 111. 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 is fixed in the first threaded fixing groove 111, it can be screwed into the first threaded fixing groove 111 using a screw connector to press the nail into the first threaded fixing groove 111, thereby realizing the connection between the nail and the nail sleeve body 110.

[0055] Meanwhile, the nail sleeve body 110 is provided with a spherical assembly hole 112 communicating with the first threaded fixing groove 111. The spherical assembly hole 112 penetrates the bottom wall of the first threaded fixing groove 111 and extends in a direction perpendicular to the horizontal plane. The sagittal plane, coronal plane, and horizontal plane are mutually perpendicular. The pressure cap 130 is connected to the first threaded fixing groove 111. The pressure cap 130 can close the port of the spherical assembly hole 112 communicating with the first threaded fixing groove 111, thereby preventing the positioning member 300 from coming out of the opening of the first threaded fixing groove 111 from exiting the nail sleeve body 110. It should be understood that when installing the nail bar, the pressure cap 130 is first used to fix the positioning member 300 in the spherical assembly hole 112, then the nail bar is placed in the first threaded fixing groove 111, and then connected to the first threaded fixing groove 111 by a screw connector to press the nail bar tightly into the first threaded fixing groove 111.

[0056] It should be noted that the connecting shaft 120 is located on one side of the groove sidewall of the staple sleeve body 110 corresponding to the U-shaped groove. Furthermore, a widened portion 121 is provided at the end of the connecting shaft 120 away from the staple sleeve body 110. The widened portion 121 can be a ball head, and its diameter is larger than the diameter of the rest of the connecting shaft 120. It should be understood that the widened portion 121 can be integrally formed on the end of the connecting shaft 120, or it can be a separate structure from the connecting shaft 120, allowing it to be detached from the connecting shaft 120 or fixed to the connector. Because the widened portion 121 is a ball head with a smooth surface, it is less likely to scratch tissue, improving surgical safety.

[0057] In this embodiment, optionally, the positioning element 300 can be a laminar hook or a pedicle screw. The laminar hook and pedicle screw differ in how they fix the rod to the vertebral body. Pedicle screws can only be implanted in the pedicle region of the vertebral body, while laminar hooks can be fixed to bony locations such as the lamina and transverse processes. For patients with deformities and narrowed pedicles, pedicle screws cannot achieve fixation, requiring the use of a laminar hook. Furthermore, laminar hook fixation is a semi-rigid fixation method compared to pedicle fixation, which may offer better clinical benefits for some patients.

[0058] It should be understood that the connection method between the laminae hook and the pedicle screw and the nail sleeve body 110 is the same. In this embodiment, the laminae hook is used as an example for explanation. One end of the positioning member 300 is provided with a ball joint 310, which is embedded in the ball assembly hole 112. The ball joint 310 and the ball assembly hole 112 form a ball joint. The positioning member 300 has a wide range of rotation relative to the nail sleeve body 110 and is flexible in adjustment.

[0059] It is worth noting that when assembling the lamina hook or pedicle screw, the tip of the positioning member 300 can be inserted through the first threaded fixing groove 111 and exit through the spherical mounting hole 112, so that the spherical connector 310 is embedded in the spherical mounting hole 112. 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 connector 310, preventing the spherical connector 310 from dislodging from the spherical mounting hole 112, thus 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 may be connected to the nail sleeve body 110 by other structures, instead of being directly screwed to the first threaded fixing groove 111.

[0060] Please combine Figure 1 , Figure 6 and Figure 7In 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 on one side of the 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 bar, and a screw connector can be installed in the second threaded fixing groove 201 to fix the nail bar in the second threaded fixing groove 201. The guide hole 202 extends through the second nail sleeve 200 in the extension direction of the first axis 001. The guide hole 202 is a strip-shaped hole, that is, the cross-sectional profile of the guide hole 202 is rectangular. When the connecting shaft 120 passes through 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] Furthermore, the end of the connecting shaft 120 is provided with a widened portion 121. 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 is away from the nail sleeve body 110 along the first axis 001, thereby restricting the second nail sleeve 200 from disengaging from the connecting shaft 120 and improving the stability of the engagement between the first nail sleeve 100 and the second nail sleeve 200.

[0062] The multi-directional adjustable dual-head spinal fixation mechanism provided in this embodiment allows for multi-directional adjustment of the first nail sleeve 100 and the second nail sleeve 200. This flexible adjustment range adapts to the multi-angle adjustment needs in complex spinal deformity surgeries. This spinal fixation mechanism can accommodate various complex spinal surgeries, including but not limited to scoliosis correction, intervertebral disc replacement, and spinal tumor resection. Simultaneously, the multi-directional adjustment enables precise positioning during surgery, allowing surgeons to better avoid important nerves and blood vessels, reducing damage to surrounding tissues. Furthermore, the versatility of the adjustment function may reduce repeated adjustments to the patient's posture during surgery, thereby shortening surgical time and reducing intraoperative risks. Moreover, the multi-directional adjustment function in the sagittal and coronal planes ensures the stability of the laminar hooks during surgery, preventing loosening or displacement. This is crucial for spinal stability during postoperative rehabilitation, reducing postoperative complications and improving the quality of patient recovery.

[0063] It should be noted that at least one of the first nail sleeve 100, the second nail sleeve 200, and the positioning element 300 can be made of biocompatible materials such as titanium alloy or stainless steel. This not only ensures the long-term stability and safety of the laminectomy hook in the human body, but also provides excellent corrosion resistance and mechanical strength. The laminectomy hook can withstand long-term biomechanical stress without deformation or damage, extending the service life of the implant.

[0064] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A multi-directional adjustable double-headed spinal fixation mechanism, characterized in that, include: The device comprises a first nail sleeve (100), a second nail sleeve (200), and a positioning element (300). The first nail sleeve (100) and the second nail sleeve (200) are rotatably engaged around a first axis (001), and the first nail sleeve (100) and the second nail sleeve (200) are slidably engaged in the extension direction of the first axis (001). The first nail sleeve (100) and the second nail sleeve (200) are slidably engaged in the extension direction of a second axis (002) perpendicular to the first axis (001). The positioning element (300) is rotatably mounted on the first nail sleeve (100).

2. The multi-directional adjustable double-headed spinal fixation mechanism according to claim 1, characterized in that: The first nail sleeve (100) includes a connected nail sleeve body (110) and a connecting shaft (120), the second nail sleeve (200) is rotatably engaged with the connecting shaft (120), and the axis of the connecting shaft (120) is parallel to the first axis (001); the positioning member (300) is rotatably mounted on the nail sleeve body (110).

3. The multi-directional adjustable double-headed spinal fixation mechanism according to claim 2, characterized in that: The connecting shaft (120) is provided with a widening portion (121) for contacting the second nail sleeve (200) to restrict the second nail sleeve (200) from disengaging from the connecting shaft (120) along the extension direction of the first axis (001).

4. The multi-directional adjustable double-headed spinal fixation mechanism according to claim 3, 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-headed spinal fixation mechanism according to claim 2, characterized in that: The nail sleeve body (110) and the connecting shaft (120) are configured as an integral structure.

6. The multi-directional adjustable double-headed spinal fixation mechanism according to claim 2, characterized in that: The second nail sleeve (200) is provided with a guide hole (202), and the connecting shaft (120) passes through the guide hole (202). The connecting shaft (120) and the guide hole (202) are rotatably engaged. The connecting shaft (120) and the guide hole (202) are slidably engaged in the extension direction of the first axis (001). The connecting shaft (120) and the guide hole (202) are slidably engaged in the extension direction of the second axis (002).

7. The multi-directional adjustable double-headed spinal fixation mechanism according to claim 1, characterized in that: The positioning component (300) is provided with a ball joint (310), and the first nail sleeve (100) is provided with a ball assembly hole (112). The ball joint (310) is rotatably embedded in the ball assembly hole (112).

8. The multi-directional adjustable double-headed spinal fixation mechanism according to claim 1, characterized in that: The positioning element (300) is configured as a laminar hook or a pedicle screw.

9. The multi-directional adjustable double-headed spinal fixation mechanism according to claim 1, characterized in that: Both the first nail sleeve (100) and the second nail sleeve (200) are provided with threaded fixing grooves.

10. The multi-directional adjustable double-headed spinal fixation mechanism according to claim 9, characterized in that: The multi-directional adjustable dual-head spinal fixation mechanism further includes a pressure cap (130), which is fixed to the threaded fixing groove. The pressure cap (130) contacts the positioning member (300) to restrict the positioning member (300) from dislodging from the opening of the threaded fixing groove from the first nail sleeve (100).

Images