Lumbar anterior fusion cage

Abstract

The utility model provides an anterior lumbar fusion cage, which is characterized by comprising a mounting main body provided with three mounting holes; the three locking screws are respectively and correspondingly mounted in the three mounting holes, and the three locking screws are arranged in the three mounting holes; and a triangle is defined by the tip ends of the locking screws. According to the lumbar anterior fusion cage, the number of the locking screws on the mounting body is reduced, so that the assembling time of the mounting body and the locking screws is shortened, the operation time is shortened, and then the locking screws are arranged to be triangular, so that the stability of the whole device is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to anterior lumbar fusion device. Background Technology

[0002] Degenerative lumbar spine diseases are common and frequently occurring orthopedic conditions that severely impact patients' lives and work. Anterior lumbar fusion is a commonly used and effective treatment method. The anterior lumbar fusion device, as an important tool in this procedure, primarily functions to restore intervertebral disc height and physiological curvature, achieving immediate postoperative stability, reducing pedicle screw breakage, promoting intervertebral bony fusion, and to some extent reducing the amount of autologous bone used, thereby minimizing a series of complications.

[0003] Most existing anterior lumbar fusion cages are four-screw structures, meaning each cage includes four locking screws. Therefore, these four screws need to be installed into the cage during surgery. Because installing the locking screws takes time, the surgery time is prolonged. And the longer the surgery, the more detrimental it is to the patient's safety. Utility Model Content

[0004] This invention provides an anterior lumbar fusion device to solve the problem in the prior art that four locking screws need to be installed in the anterior lumbar fusion device.

[0005] This utility model provides an anterior lumbar fusion device, comprising:

[0006] The mounting body has three mounting holes;

[0007] Three locking screws are respectively installed in the three mounting holes;

[0008] The tips of each locking screw form a triangle.

[0009] According to the present invention, an anterior lumbar fusion device has three mounting holes located on the same side of the mounting body, wherein the two mounting holes on both sides have the same orientation, and the mounting hole in the middle has a different orientation than the two mounting holes on both sides.

[0010] According to the present invention, an anterior lumbar fusion device is provided, wherein the mounting hole is a threaded hole, and the locking screw is threadedly connected to the mounting hole.

[0011] According to the present invention, an anterior lumbar fusion device is provided, wherein the locking screw includes a nut, a snap-fit ​​section and a threaded section, the threaded section is threadedly connected to the mounting hole, and the snap-fit ​​section is located between the nut and the threaded section.

[0012] According to the present invention, in an anterior lumbar fusion device, the diameter of the snap-fit ​​section is smaller than the diameter of the nut, and the diameter of the snap-fit ​​section is smaller than the diameter of the threaded section.

[0013] According to the present invention, an anterior lumbar fusion device is provided, wherein the snap-fit ​​section snaps into the mounting hole.

[0014] According to the present invention, an anterior lumbar fusion device is provided in which the shape of the mounting body corresponds to the shape of the vertebral body.

[0015] According to the present invention, an anterior lumbar fusion device is provided, wherein the mounting body has at least two bone graft windows.

[0016] According to the present invention, an anterior lumbar fusion device is provided, wherein the mounting body is further provided with anti-slip teeth, the anti-slip teeth are provided on the end face of the mounting body where the bone graft window is opened, and the orientation of the anti-slip teeth is opposite to the implantation direction of the mounting body.

[0017] According to the present invention, an anterior lumbar fusion device is provided, wherein the mounting body is provided with at least two clamping holes, and the two clamping holes are respectively located at both ends of the mounting body.

[0018] This utility model provides an anterior lumbar fusion device with only three mounting holes on the main body, corresponding to three locking screws, with one locking screw in each mounting hole. Compared to the four-screw structure of existing anterior lumbar fusion devices, this utility model only has three locking screws, thus reducing the time required to install one locking screw. Furthermore, in this embodiment, the three locking screws are arranged in a triangle, improving the stability of the anterior lumbar fusion device while reducing the number of locking screws. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the anterior lumbar fusion device provided by this utility model.

[0021] Figure 2 This is a cross-sectional view of the anterior lumbar fusion device provided by this utility model.

[0022] Figure 3This is a schematic diagram of the locking screw provided by this utility model.

[0023] Figure 4 This is a schematic diagram of the anterior direction of the lumbar anterior fusion device provided by this utility model.

[0024] Figure label:

[0025] 1. Mounting body; 11. Mounting hole; 12. Bone graft window; 13. Anti-slip teeth; 14. Clamping hole;

[0026] 2. Locking screw; 21. Nut; 22. Snap-fit ​​section; 23. Threaded section. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] The following is combined Figure 1 This invention describes an anterior lumbar fusion device, comprising a mounting body 1 and three locking screws 2. The mounting body 1 has three mounting holes 11, and the three locking screws 2 are respectively installed in the three mounting holes 11. The tips of each locking screw 2 form a triangle.

[0029] This application Figure 1 The example shown is only one example of the assembly of the locking screw 2 and the mounting body 1. In different embodiments, it is necessary to select the corresponding size of the locking screw 2 according to the actual surgical requirements before assembling it with the mounting body 1.

[0030] like Figure 1 As shown, three mounting holes 11 are provided at the top of the mounting body 1. In this embodiment... Figure 1 The top of the mounting body 1 is in the middle, but in different embodiments, it can also be in different directions. Correspondingly, the anterior lumbar fusion device also includes three locking screws 2, each inserted into a mounting hole 11, with the three locking screws 2 corresponding to the three mounting holes 11. For example... Figure 1 As shown, each mounting hole 11 contains a corresponding locking screw 2.

[0031] Because the anterior lumbar fusion device provided in this embodiment only has three locking screws 2, during the operation, only these three locking screws 2 need to be assembled onto the mounting body 1. Compared to the four-screw structure of the existing anterior lumbar fusion device, which requires the installation of four screws during the operation, the operation time of the four-screw structure is affected by the installation of four screws, resulting in a longer operation time. Under the same other surgical conditions, the anterior lumbar fusion device provided in this embodiment only requires the assembly of three locking screws 2. Therefore, compared to the operation time of the existing technology that requires the installation of four screws, the anterior lumbar fusion device provided in this embodiment can save operation time and improve patient safety during the operation.

[0032] Furthermore, in this embodiment, the three locking screws 2 are arranged in the shape of a triangular pyramid, and the extensions of the three locking screws 2 have the same intersection point. For example... Figure 1 As shown, the tips of each locking screw 2 form a triangle. Therefore, in this embodiment, by arranging the three locking screws 2 in the shape of a triangular pyramid, the three locking screws 2 form a triangle. Because triangles have stability, this embodiment can improve the overall structural stability while reducing the number of locking screws 2, ensuring the performance of the anterior lumbar fusion device meets requirements. In this embodiment, the arrangement of the three locking screws 2 in the form of a triangular pyramid is used as an example. In different embodiments, the arrangement position of the three locking screws 2 can also be adjusted, but the tips of the three locking screws 2 need to be located at the three vertices of the same triangle to improve stability.

[0033] In this embodiment, the number of locking screws 2 is reduced firstly to shorten the operation time. Secondly, the stability of the overall structure is improved by arranging the three locking screws 2 in the form of a triangular pyramid.

[0034] In one embodiment, three mounting holes 11 are provided on the same side of the mounting body 1, wherein the two mounting holes 11 located on both sides have the same orientation, and the mounting hole 11 located in the middle has a different orientation than the two mounting holes 11 on both sides. In one embodiment, the mounting holes 11 are threaded holes, and the locking screw 2 is threadedly connected to the mounting holes 11.

[0035] like Figure 1 As shown, in this embodiment, three mounting holes 11 are formed at the top of the mounting body 1, and all three mounting holes 11 are angled holes. The three mounting holes 11 are arranged along the same straight line. In this embodiment, the two mounting holes 11 on both sides face left, and the middle mounting hole 11 faces right. When the three locking screws 2 are inserted into the three mounting holes 11 respectively, the triangular structure formed by the three locking screws 2 is more stable and can make the overall force distribution more uniform. Figure 2As shown, the mounting hole 11 is threaded, which makes the connection between the locking screw 2 and the mounting hole 11 more secure and also makes the assembly process simpler and more convenient.

[0036] In one embodiment, the locking screw 2 includes a nut 21, a snap-fit ​​section 22, and a threaded section 23. The threaded section 23 is threadedly connected to the mounting hole 11, and the snap-fit ​​section 22 is located between the nut 21 and the threaded section 23.

[0037] like Figure 3 As shown, the locking screw 2 has a nut 21 and a threaded section 23 at its two ends. The nut 21 provides the force point for rotating the entire locking screw 2. The locking screw 2 is aligned with the mounting hole 11 through one end of the threaded section 23, and then the nut 21 is driven. The nut 21 drives the threaded section 23 to align and connect with the thread in the mounting hole 11, and then the screw is tightened through thread engagement during rotation.

[0038] When the threaded section 23 is screwed into the mounting hole 11, the snap-fit ​​section 22 is aligned with the threaded section in the mounting hole 11. The snap-fit ​​section 22 engages with the mounting hole 11, thereby ensuring the stability of the locking screw 2 in the mounting hole 11.

[0039] In one embodiment, the diameter of the snap-fit ​​section 22 is smaller than the diameter of the nut 21, and the diameter of the snap-fit ​​section 22 is smaller than the diameter of the threaded section 23. In another embodiment, the length of the snap-fit ​​section 22 corresponds to the length of the threaded portion in the mounting hole 11, and the diameter of the thread in the mounting hole 11 corresponds to the diameter of the snap-fit ​​section 22.

[0040] Please refer to the above as well. Figure 2 and Figure 3 When the threaded section 23 of the locking screw 2 is fully screwed into the mounting hole 11, because the diameter of the retaining section 22 is smaller than the diameter of the threaded section 23, the retaining section 22 can enter the mounting hole 11, and the retaining section 22 on the locking screw 2 aligns with the thread inside the mounting hole 11. At this time, because the diameter of the nut 21 is larger than the diameter of the retaining section 22, the nut 21 cannot enter the mounting hole 11, and the nut 21 will abut against the thread inside the mounting hole 11. At the same time, because the threaded section 23 has already engaged with the thread inside the mounting hole 11, if the threaded section 23 rotates through the threaded section inside the mounting hole 11 and is not aligned with the thread inside the mounting hole 11, the threaded section 23 will also abut against the thread inside the mounting hole 11.

[0041] Therefore, in this embodiment, the diameter of the snap-fit ​​segment 22 is designed to be smaller than the diameters of both ends, so that the snap-fit ​​segment 22 forms an inwardly recessed structure on the locking screw 2. Then, the mounting hole 11 is a threaded hole, and the thread inside the mounting hole 11 protrudes towards the center, so that the mounting hole 11 forms an outwardly protruding structure. When the snap-fit ​​segment 22 is aligned with the threaded section of the mounting hole 11, the protruding thread of the mounting hole 11 precisely engages with the inwardly recessed snap-fit ​​segment 22. Along the axial direction of the mounting hole 11, the protruding thread of the mounting hole 11 abuts against the nuts 21 at both ends and the threaded section 23, achieving a limiting effect.

[0042] Furthermore, in this embodiment, the length of the snap-fit ​​segment 22 is designed to correspond to the length of the threaded portion within the mounting hole 11. This correspondence means that, without considering external factors such as tolerances, the length of the snap-fit ​​segment 22 is equal to the length of the threaded portion within the mounting hole 11. This ensures that after the protruding thread of the mounting hole 11 engages with the concave snap-fit ​​segment 22, the protruding thread of the mounting hole 11 precisely abuts against the nuts 21 at both ends and the threaded segment 23. At this point, the forward and backward movement of the locking screw 2 along the axial direction is resisted, preventing the locking screw 2 from moving and ensuring the stability of the locking screw 2 within the mounting hole 11.

[0043] Meanwhile, in existing surgical procedures, after assembling the screws with the four-screw anterior lumbar fusion device, an additional step of tightening the screws to prevent them from slipping out during use. In this embodiment, the protruding thread of the mounting hole 11 precisely abuts against the nuts 21 at both ends and the threaded section 23, preventing the locking screw 2 from slipping back. This reduces the need for a single tightening step, further shortening the surgical time and improving safety during the procedure.

[0044] In one embodiment, the shape of the mounting body 1 corresponds to the shape of the vertebral body. In another embodiment, the mounting body 1 has at least two bone graft windows 12.

[0045] Please refer to the above as well. Figure 1 and Figure 4 The overall shape of the mounting body 1 is approximately elliptical, and its anatomical shape closely resembles that of the vertebral body. Therefore, using this structural form of the mounting body 1 allows for a more precise fit to the actual lumbar vertebrae. Figure 1 As shown, two through holes are also provided on the mounting body 1, which are the bone graft windows 12. The provision of at least two bone graft windows 12 on the mounting body 1 can further increase the effective bone graft area and promote bone fusion.

[0046] In one embodiment, the mounting body 1 is further provided with anti-slip teeth 13, which are located on the end face of the mounting body 1 where the bone graft window 12 is provided, and the orientation of the anti-slip teeth 13 is opposite to the implantation direction of the mounting body 1. In one embodiment, the mounting body 1 is further provided with at least two clamping holes 14, which are respectively located at both ends of the mounting body 1.

[0047] Please refer to the above as well. Figure 1 and Figure 2 The two end faces of the mounting body 1 are provided with multiple protrusions arranged in the same direction, which are anti-slip teeth 13, and the anti-slip teeth 13 are arranged at an angle. Because the orientation of the anti-slip teeth 13 is opposite to the implantation direction of the mounting body 1, after the mounting body 1 is implanted, when the mounting body 1 moves in the opposite direction to the implantation direction, it will be supported by the anti-slip teeth 13, thereby preventing the mounting body 1 from moving. For example, if the implantation direction of the mounting body 1 is forward, then the orientation of the anti-slip teeth 13 is tilted backward. In this embodiment, on the surface of the mounting body 1 where the mounting hole 11 is opened, a clamping hole 14 is also opened, and a clamping hole 14 is provided at each end of the surface, so as to facilitate clamping.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lumbar anterior fusion device, characterized in that, include: The mounting body (1) has three mounting holes (11). Three locking screws (2) are respectively installed in the three mounting holes (11); The tips of each of the locking screws (2) form a triangle.

2. The anterior lumbar fusion device according to claim 1, characterized in that, The three mounting holes (11) are provided on the same side of the mounting body (1), wherein the two mounting holes (11) on both sides have the same orientation, and the mounting hole (11) in the middle has a different orientation than the two mounting holes (11) on both sides.

3. The anterior lumbar fusion device according to claim 1, characterized in that, The mounting hole (11) is a threaded hole, and the locking screw (2) is threadedly connected to the mounting hole (11).

4. The anterior lumbar fusion device according to claim 3, characterized in that, The locking screw (2) includes a nut (21), a snap-fit ​​section (22) and a threaded section (23), the threaded section (23) being threadedly connected to the mounting hole (11), and the snap-fit ​​section (22) being located between the nut (21) and the threaded section (23).

5. The anterior lumbar fusion device according to claim 4, characterized in that, The diameter of the snap-fit ​​section (22) is smaller than the diameter of the nut (21), and the diameter of the snap-fit ​​section (22) is smaller than the diameter of the threaded section (23).

6. The anterior lumbar fusion device according to claim 4, characterized in that, The snap-fit ​​section (22) snaps into the mounting hole (11).

7. The anterior lumbar fusion device according to claim 1, characterized in that, The shape of the mounting body (1) corresponds to the shape of the cone.

8. The anterior lumbar fusion device according to claim 1, characterized in that, The mounting body (1) has at least two bone graft windows (12).

9. The anterior lumbar fusion device according to claim 8, characterized in that, The mounting body (1) is also provided with anti-slip teeth (13), which are provided on the end face of the mounting body (1) where the bone graft window (12) is opened, and the orientation of the anti-slip teeth (13) is opposite to the implantation direction of the mounting body (1).

10. The anterior lumbar fusion device according to claim 1, characterized in that, The mounting body (1) is also provided with at least two clamping holes (14), which are respectively located at both ends of the mounting body (1).

Images