Fixing screw in lumbar vertebra body

Abstract

The utility model relates to the technical field of orthopedic implants, and discloses a lumbar vertebra internal fixing screw which comprises a rod body, the outer wall of the bottom of the rod body is fixedly connected with a tip end, the outer wall of the side face of the rod body is connected with a stud in a sliding mode, a fixing mechanism is arranged on the rod body, an adjusting mechanism is arranged on the fixing mechanism, and the adjusting mechanism is connected with the tip end. The fixing mechanism comprises a straight rod, the two ends of the straight rod are rotationally connected to the inner walls of the two sides of the rod body through bearings, a barb is fixedly connected to the straight rod, a torsional spring is fixedly connected to the straight rod, and an arc-shaped groove is formed in the inner wall of the side, close to the barb, of the stud. According to the utility model, the barb, the torsion spring and other structures are arranged, so that the outer surfaces of the two ends are attached, clamped and supported while the two vertebral bodies of the lumbar vertebra are hit and supported, and the problems that the steel nail is in the barb shape when hit and is inconvenient to take out from the hit position, so that the steel nail needs to be detached from the vertebral bodies, and the operation difficulty is increased are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic implants, in particular to a lumbar vertebral body fixation screw. Background Art

[0002] Anterior thoracolumbar fixation surgery is a basic technique for treating thoracolumbar spondylosis. The conventional method is to use an anterior thoracolumbar approach and implant a thoracolumbar fixation system to treat the patient. This technology can effectively solve diseases such as thoracolumbar tuberculosis, lumbar fractures, and degenerative spinal deformation. It can also perform spinal correction well, has a great effect on reconstructing the patient's spinal stability, and greatly improves the patient's cure rate.

[0003] After searching, Chinese patent announcement number: CN213406249U discloses a lumbar lateral vertebral body fixation screw, including a combination of several rods connected in sequence, a tip arranged at the bottom of the combination, and a bolt arranged at the top of the combination. The utility model adopts a triangular pyramid shape to make the device firmly fixed; by adopting a combination of several rods, the length can be easily adjusted, which is suitable for different groups of people; by designing the stud as an eccentric stud and the threaded hole as a perfect circular threaded hole, the fixation between the rods, between the rods and the tip, and between the bolts and the rods is very firm.

[0004] The above device has the following defects: the main method of lumbar screw-rod system internal fixation is to drive steel nails into the upper and lower vertebrae of the diseased segment, thereby maintaining the stability of the steel cone and playing a supporting and fixing role. However, the steel nails are in a hook shape when driven in, which is inconvenient to remove from the driven position, resulting in the need to disassemble them from the vertebral body, increasing the difficulty of the operation. Therefore, a lumbar vertebral body fixation screw is proposed to solve the above problem. Utility Model Content

[0005] In order to remedy the above deficiencies, the utility model provides a lumbar vertebral intravertebral fixation screw, which aims to improve the prior art of driving steel nails into the upper and lower vertebrae of the diseased segment, thereby maintaining the stability of the steel cone and playing a supporting and fixing role. However, the steel nail is in a hook shape when driven in, which is inconvenient to remove from the driven position, resulting in the need to disassemble it from the vertebral body, increasing the difficulty of the operation.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a lumbar vertebral body fixation screw, comprising a rod body, the bottom outer wall of the rod body is fixedly connected with a tip, the side outer wall of the rod body is slidably connected with a stud, the rod body is provided with a fixing mechanism, the fixing mechanism is provided with an adjusting mechanism, the fixing mechanism comprises a straight rod, the two ends of the straight rod are rotatably connected to the inner walls of the two sides of the rod body through bearings, the straight rod is fixedly connected with a barb, the straight rod is fixedly connected with a torsion spring, an arc groove is provided on the inner wall of the stud on the side close to the barb, a threaded groove is provided on the end of the rod body away from the tip, the inner ring of the threaded groove is threadedly connected with a threaded barrel, the side outer wall of the threaded barrel is fixedly connected with a movable disk, the side outer wall of the threaded barrel is rotatably connected with a fixing plate, and the bottom outer wall of the fixing plate is fixedly connected with a resist plate.

[0007] As a further description of the above technical solution: the adjustment mechanism includes an installation groove, which is opened on the top inner wall of the stud, the inner circle of the installation groove is threadedly connected to a connecting column, the inner circle of the threaded groove is threadedly connected to an extension rod, the top inner wall of the connecting column is provided with a connecting groove, and the top inner wall of the extension rod is provided with an expansion groove.

[0008] As a further description of the above technical solution: one end of the torsion spring away from the straight rod is fixedly connected to an inner wall of one side of the rod body.

[0009] As a further description of the above technical solution: a groove is provided on the side outer wall of the movable disk.

[0010] As a further description of the above technical solution: a wear-resistant pad is fixedly connected to the outer wall of one side of the abutment plate close to the stud.

[0011] As a further description of the above technical solution: the expansion groove is threadedly connected to the threaded barrel.

[0012] As a further description of the above technical solution: the connecting column is slidably connected to the side outer wall of the extension rod, and the connecting column is clamped on the top outer wall of the stud.

[0013] As a further description of the above technical solution: the outer diameter of the tip is adapted to the outer diameter of the stud.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, by providing structures such as barbs, torsion springs, and threaded tubes, the two vertebral bodies of the lumbar spine are supported while the outer surfaces of both ends are attached and supported, thereby improving the problem that the steel nails are in a barbed shape when driven in, which makes it inconvenient to remove them from the driven position, resulting in the need to disassemble them from the vertebral body, increasing the difficulty of the operation. At the same time, the problem of loosening and detachment caused by ordinary thread fixation, which requires re-operation and replacement, is improved.

[0016] 2. In the utility model, by setting structures such as connecting columns, connecting grooves, and expansion grooves, the support length of the rod body and the stud can be adjusted according to the length and thickness of the lumbar vertebrae of different patients and the support position, thereby improving the traditional rod body length in an integrated manner and with a relatively single size. When the length is insufficient, additional cutting or replacement of the corresponding length is required, which increases the difficulty of fixed support between vertebrae during surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall front view of a lumbar vertebral body fixation screw proposed by the utility model;

[0018] Figure 2 This is a schematic side view of the entirety of a lumbar vertebral body fixation screw proposed by the utility model;

[0019] Figure 3 A cross-sectional schematic diagram of a lumbar vertebral body fixation screw proposed by the utility model;

[0020] Figure 4 A schematic diagram of a fixing mechanism for a lumbar vertebral body fixing screw proposed by the utility model;

[0021] Figure 5 The utility model is a schematic diagram of an adjustment mechanism of a lumbar vertebral body fixation screw.

[0022] Legend:

[0023] 1. Rod body; 2. Tip; 3. Stud; 4. Fixing mechanism; 41. Straight rod; 42. Barb; 43. Torsion spring; 44. Arc groove; 45. Threaded groove; 46. Threaded barrel; 47. Movable disk; 48. Fixing plate; 49. Abutment plate; 5. Adjusting mechanism; 50. Mounting groove; 51. Connecting column; 52. Extension rod; 53. Connecting groove; 54. Expansion groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference Figure 1-Figure 3The utility model provides an embodiment: a lumbar vertebral body fixation screw, comprising a rod body 1, a tip 2 is fixedly connected to the bottom outer wall of the rod body 1, and the two vertebrae are penetrated by setting the tip 2, a stud 3 is slidably connected to the side outer wall of the rod body 1, and the two vertebrae are auxiliaryly connected by setting the stud 3, a fixing mechanism 4 is arranged on the rod body 1, and an adjusting mechanism 5 is arranged on the fixing mechanism 4, and the fixing mechanism 4 comprises a straight rod 41, and the two ends of the straight rod 41 are rotatably connected to the inner walls of the two sides of the rod body 1 through bearings, a barb 42 is fixedly connected to the straight rod 41, and a torsion spring 43 is fixedly connected to the barb 42 by setting the torsion spring 43 A torque is generated toward the outer wall of the rod body 1. An arc groove 44 is provided on the inner wall of the side of the stud 3 close to the hook 42. The hook 42 is pushed out and unfolded by setting the arc groove 44. A threaded groove 45 is provided on the end of the rod body 1 away from the tip 2. The inner circle of the threaded groove 45 is threadedly connected to a threaded barrel 46. The side outer wall of the threaded barrel 46 is fixedly connected to a movable disk 47. The movable disk 47 is provided to facilitate personnel to rotate the threaded barrel 46 in different directions. The side outer wall of the threaded barrel 46 is rotatably connected to a fixed plate 48. The bottom outer wall of the fixed plate 48 is fixedly connected to a resist plate 49. The resist plate 49 is provided to press the connecting column 51 or the stud 3 downward.

[0026] Reference Figure 2-Figure 4 The end of the torsion spring 43 away from the straight rod 41 is fixedly connected to the inner wall of one side of the rod body 1, a groove is provided on the side outer wall of the movable disk 47, and a wear-resistant pad is fixedly connected to the outer wall of the side of the abutment plate 49 close to the stud 3. The wear-resistant pad is provided to reduce the wear and damage of the abutment plate 49, the expansion groove 54 is threadedly connected to the threaded barrel 46, and the outer diameter of the tip 2 is adapted to the outer diameter of the stud 3.

[0027] Reference Figure 4-Figure 5 The adjusting mechanism 5 includes a mounting groove 50, which is provided on the top inner wall of the stud 3. The inner circle of the mounting groove 50 is threadedly connected with a connecting column 51. The stud 3 is extended by setting the connecting column 51. When the two vertebrae are auxiliary connected, the length of the stud 3 is not enough, and the stud 3 of the corresponding length needs to be replaced during the replacement operation, which makes the operation difficult and time prolonged. The inner circle of the threaded groove 45 is threadedly connected with an extension rod 52. A connecting groove 53 is provided on the top inner wall of the connecting column 51. An expansion groove 54 is provided on the top inner wall of the extension rod 52. The length of the rod body 1 is adjusted by setting the extension rod 52, so as to facilitate the perforation and fixing the length between the two lumbar vertebrae of different patients. The connecting column 51 is slidably connected to the side outer wall of the extension rod 52, and the connecting column 51 is clamped on the top outer wall of the stud 3.

[0028] Working principle: The rod body 1 drives the tip 2 to penetrate the two vertebrae, and then the stud 3 is inserted to connect and support the two vertebrae, and then the movable plate 47 is rotated to rotate the threaded tube 46, and the threaded tube 46 rotates and is threadedly fixed with the thread groove 45, so that the fixing plate 48 is attached to one side before the vertebrae penetrate, and at the same time, the support plate 49 is pressed against the stud 3, so that when the rod body 1 is moved upward by the threaded tube 46, the barb 42 moves to contact the arc groove 44, so that the barb 42 is squeezed and expanded to make the straight rod 41 rotate, and the rotation of the straight rod 41 drives the torsion spring 4 3 is rotated, and the two ends of the two vertebrae are attached and clamped by the barb 42 and the fixing plate 48 for fixing the support. The rod body 1 and the stud 3 penetrate different vertebrae of different patients, and the length of the supporting connector needs to be adjusted. The connecting column 51 is threadedly connected to the mounting groove 50 for threaded fixation, and the extension rod 52 is threadedly fixed and extended with the thread groove 45 by rotating, and then the expansion groove 54 is threadedly connected with the threaded cylinder 46, so that the fixing plate 48 is clamped on the outer wall of one end of the vertebrae.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lumbar vertebral intrabody fixation screw, comprising a rod body (1), characterized in that: The bottom outer wall of the rod body (1) is fixedly connected to a tip (2), the side outer wall of the rod body (1) is slidably connected to a stud (3), the rod body (1) is provided with a fixing mechanism (4), the fixing mechanism (4) is provided with an adjustment mechanism (5), the fixing mechanism (4) comprises a straight rod (41), the two ends of the straight rod (41) are rotatably connected to the inner walls of both sides of the rod body (1) through bearings, the straight rod (41) is fixedly connected to a barb (42), and the straight rod (41) is fixedly connected to A torsion spring (43), an arc groove (44) is provided on the inner wall of one side of the stud (3) close to the barb (42), a thread groove (45) is provided on the end of the rod body (1) away from the tip (2), the inner circle of the thread groove (45) is threadedly connected to a threaded barrel (46), the side outer wall of the threaded barrel (46) is fixedly connected to a movable disk (47), the side outer wall of the threaded barrel (46) is rotatably connected to a fixed plate (48), and the bottom outer wall of the fixed plate (48) is fixedly connected to a stop plate (49).

2. A lumbar vertebral body fixation screw according to claim 1, characterized in that: The adjusting mechanism (5) comprises a mounting groove (50), wherein the mounting groove (50) is provided on the top inner wall of the stud (3), the inner circle of the mounting groove (50) is threadedly connected to a connecting column (51), the inner circle of the threaded groove (45) is threadedly connected to an extension rod (52), a connecting groove (53) is provided on the top inner wall of the connecting column (51), and an expansion groove (54) is provided on the top inner wall of the extension rod (52).

3. The lumbar vertebral body fixation screw according to claim 1, characterized in that: One end of the torsion spring (43) away from the straight rod (41) is fixedly connected to an inner wall of one side of the rod body (1).

4. The lumbar vertebral body fixation screw according to claim 1, characterized in that: The outer side wall of the movable plate (47) is provided with a groove.

5. The lumbar vertebral body fixation screw according to claim 1, characterized in that: A wear-resistant pad is fixedly connected to the outer wall of one side of the abutment plate (49) close to the stud (3).

6. The lumbar vertebral body fixation screw according to claim 2, characterized in that: The expansion groove (54) is threadedly connected to the threaded barrel (46).

7. The lumbar vertebral body fixation screw according to claim 2, characterized in that: The connecting column (51) is slidably connected to the side outer wall of the extension rod (52), and the connecting column (51) is clamped on the top outer wall of the stud (3).

8. The lumbar vertebral body fixation screw according to claim 1, characterized in that: The outer diameter of the tip (2) is adapted to the outer diameter of the stud (3).

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