Lumbar vertebra posterior fixing system

Abstract

The utility model discloses a lumbar vertebra posterior fixing system which comprises at least two pedicle screws and a connecting rod, the connecting rod is connected with the two pedicle screws, the side wall of the connecting rod is provided with at least one avoiding space, and the avoiding space is located between the two pedicle screws. The receding space is arranged on the side wall of the connecting rod, after a pedicle screw and the connecting rod are installed, the connecting rod does not need to be dismantled, the fusion cage can be directly implanted through the receding space, operation is simplified, efficiency is improved, operation time is shortened, and damage is small.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic medical devices, in particular to a lumbar posterior fixation system. Background Technique

[0002] Lumbar fusion surgery is a common surgery for treating lumbar instability caused by various diseases such as joint degeneration and intervertebral disc herniation. The key to the surgery is to implant internal fixation devices to ensure the stability of the diseased lumbar vertebra, thereby providing necessary conditions for bone graft fusion.

[0003] Currently, during the treatment process, the pedicle screw system is first fixed on the adjacent lumbar vertebrae of the diseased lumbar vertebra. After using auxiliary tools to assist in positioning the distance between the two pedicle screws, the thickness of the fusion cage can be determined. Since the connecting rod blocks the installation path of the fusion cage, after removing the connecting rod, the determined fusion cage is implanted. The operation is cumbersome, and auxiliary tools are required to position the adjacent distance, resulting in too long operation time, low efficiency, and relatively large damage. Summary of the Invention

[0004] Aiming at the above problems existing in the existing lumbar posterior fixation system, the present invention aims to provide a lumbar posterior fixation system that does not require removing the connecting rod, can directly implant the fusion cage, simplifies the operation, improves the efficiency, reduces the operation time, and causes less damage.

[0005] The specific technical solutions are as follows:

[0006] A lumbar posterior fixation system includes: at least two pedicle screws and a connecting rod. The connecting rod is connected to the two pedicle screws, and at least one avoidance space is provided on the side wall of the connecting rod, and the avoidance space is located between the two pedicle screws.

[0007] In the above lumbar posterior fixation system, the connecting rod includes: at least two connecting parts and at least one avoidance part. The two connecting parts are respectively connected to the two ends of the avoidance part, and the side wall of the avoidance part has the avoidance space.

[0008] In the above lumbar posterior fixation system, the two connecting parts and the avoidance part are of an integral structure.

[0009] In the above lumbar posterior fixation system, the avoidance part is arc-shaped or "several"-shaped.

[0010] In the above lumbar posterior fixation system, the cross-section of the connecting rod is circular.

[0011] In the above lumbar posterior fixation system, the connecting rod is made of titanium alloy or nitinol alloy.

[0012] The above lumbar posterior fixation system further includes: at least two plug screws, which are respectively installed on the two pedicle screws for locking the connecting rod.

[0013] The above lumbar posterior fixation system, wherein the pedicle screw includes a screw head and a screw base. The screw base has a receiving cavity. The screw head axially penetrates the receiving cavity along the screw base, and the end of the screw head is limited within the screw base. Notches communicating with the receiving cavity are formed on both sides of the screw base, and the connecting rod transversely penetrates the two notches and the receiving cavity along the screw base.

[0014] The above lumbar posterior fixation system, wherein the inner wall of the receiving cavity has internal threads, and at least part of the plug screw is installed in the receiving cavity and connected to the internal threads.

[0015] The above lumbar posterior fixation system, wherein the width of the notch is not less than the diameter of the cross-section of the connecting rod.

[0016] The positive effects of the above technical solution compared with the prior art are as follows:

[0017] In the utility model, an avoidance space is provided on the side wall of the connecting rod. After the pedicle screw and the connecting rod are installed, it is not necessary to remove the connecting rod, and the fusion device can be directly implanted through the avoidance space, which simplifies the operation, improves the efficiency, reduces the operation time, and causes less damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of a lumbar posterior fixation system of the utility model;

[0019] Figure 2 is a schematic diagram of the structure of the second embodiment of a lumbar posterior fixation system of the utility model;

[0020] Figure 3 is a schematic diagram of the structure of the pedicle screw of a lumbar posterior fixation system of the utility model;

[0021] In the drawings: 1, pedicle screw; 2, connecting rod; 3, avoidance space; 4, plug screw; 5, fusion device; 11, screw head; 12, screw base; 13, notch; 21, connecting part; 22, avoidance part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further illustrates the utility model with reference to the drawings and specific embodiments, but is not a limitation of the utility model.

[0023] As Figures 1 to 3As shown in the figure, a lumbar posterior fixation system of a preferred embodiment is shown, including: at least two pedicle screws 1 and a connecting rod 2. The connecting rod 2 is connected to the two pedicle screws 1, and at least one avoidance space 3 is provided on the side wall of the connecting rod 2. The avoidance space 3 is located between the two pedicle screws 1.

[0024] Furthermore, as a preferred embodiment, the connecting rod 2 includes: at least two connecting parts 21 and at least one avoidance part 22. The two connecting parts 21 are respectively connected to both ends of the avoidance part 22, and the side wall of the avoidance part 22 has the avoidance space 3.

[0025] Furthermore, as a preferred embodiment, the two connecting parts 21 and the avoidance part 22 are of an integral structure.

[0026] Furthermore, as a preferred embodiment, the avoidance part 22 is arc-shaped or "several" shaped.

[0027] In the present utility model, an avoidance space 3 is provided on the side wall of the connecting rod 2. After the pedicle screw 1 and the connecting rod 2 are installed, the connecting rod does not need to be removed, and the fusion device 5 can be directly implanted through the avoidance space 3, simplifying the operation, improving the efficiency, reducing the operation time, and causing less damage.

[0028] The above is only a preferred embodiment of the present utility model, and does not limit the implementation manner and protection scope of the present utility model accordingly.

[0029] The present utility model further has the following implementation manners on the above basis:

[0030] In a further embodiment of the present utility model, please continue to refer to Figures 1 to 3 As shown, the cross-section of the connecting rod 2 is circular.

[0031] In a further embodiment of the present utility model, the connecting rod 2 is made of titanium alloy or nitinol alloy.

[0032] In a further embodiment of the present utility model, the lumbar posterior fixation system further includes: at least two plugs 4, and the two plugs 4 are respectively installed on the two pedicle screws 1 for locking the connecting rod 2.

[0033] In a further embodiment of the present utility model, the pedicle screw 1 includes: a screw head 11 and a screw seat 12. The screw seat 12 has a receiving cavity, the screw head 11 axially penetrates through the receiving cavity along the screw seat 12, and the end of the screw head 11 is limited within the screw seat 12. Notches 13 communicating with the receiving cavity are provided on both sides of the screw seat 12, and the connecting rod 2 transversely penetrates through the two notches 13 and the receiving cavity along the screw seat 12.

[0034] In a further embodiment of the present utility model, the inner wall of the receiving cavity has internal threads, and at least part of the plug 4 is installed in the receiving cavity and connected to the internal threads.

[0035] In a further embodiment of the present utility model, the width of the notch 13 is not less than the diameter of the cross-section of the connecting rod 2.

[0036] Embodiment 1:

[0037] The lumbar posterior fixation system of the present utility model includes: two pedicle screws 1 and a connecting rod 2. The two ends of the connecting rod 2 are fixed on the two pedicle screws 1. The side wall of the middle part of the connecting rod 2 has an avoidance space 3. The two pedicle screws 1 are respectively installed on two adjacent lumbar vertebrae.

[0038] Embodiment 2:

[0039] The lumbar posterior fixation system of the present utility model includes: three pedicle screws 1 and a connecting rod 2. The two ends and the middle part of the connecting rod 2 are respectively fixed on the three pedicle screws 1. The side wall of the connecting rod 2 has two avoidance spaces 3. Each avoidance space 3 is located between two adjacent pedicle screws 1.

[0040] In addition, the lumbar posterior fixation system of the present utility model further includes: four pedicle screws 1 and a connecting rod 2. The side wall of the connecting rod 2 has three avoidance spaces 3. The avoidance spaces 3 are arranged at intervals with the pedicle screws 1.

[0041] The present utility model is not limited to Embodiments 1, 2, and 3, and further includes embodiments with more than four pedicle screws.

[0042] The above are only the preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model. For those skilled in the art, it should be able to realize that all the equivalent replacements and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A posterior lumbar fixation system, characterized in that: include: At least two pedicle screws and a connecting rod are provided, wherein the connecting rod is connected to the two pedicle screws, and the side wall of the connecting rod has at least one escape space, and the escape space is located between the two pedicle screws.

2. The posterior lumbar fixation system according to claim 1, characterized in that: The connecting rod comprises: at least two connecting parts and at least one avoiding part, the two connecting parts are respectively connected to two ends of the avoiding part, and the side wall of the avoiding part has the avoiding space.

3. The posterior lumbar fixation system according to claim 2, characterized in that: The two connecting parts and the avoiding part are an integrated structure.

4. The posterior lumbar fixation system according to claim 2, characterized in that: The avoidance portion is in an arc shape or a "J" shape.

5. The posterior lumbar fixation system according to claim 1, characterized in that: The cross section of the connecting rod is circular.

6. The posterior lumbar fixation system according to claim 1, characterized in that: The connecting rod is made of titanium alloy or nickel-titanium alloy.

7. The posterior lumbar fixation system according to claim 5, characterized in that: Also includes: At least two screw plugs are respectively installed on the two pedicle screws and are used to lock the connecting rod.

8. The posterior lumbar fixation system according to claim 7, characterized in that: The pedicle screw includes: a screw head and a screw seat, the screw seat is provided with a accommodating cavity, the screw head passes through the accommodating cavity along the axial direction of the screw seat, and the end of the screw head is limited in the screw seat, and slots connected to the accommodating cavity are provided on both sides of the screw seat, and the connecting rod passes through the two slots and the accommodating cavity along the transverse direction of the screw seat.

9. The posterior lumbar fixation system according to claim 8, characterized in that: The inner wall of the accommodating cavity has an internal thread, and at least a portion of the screw plug is installed in the accommodating cavity and connected to the internal thread.

10. The posterior lumbar fixation system according to claim 8, characterized in that: The width of the notch is not less than the diameter of the cross section of the connecting rod.

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