Artificial vertebral prosthesis assembly

Abstract

The utility model relates to the field of medical instruments, and discloses an artificial vertebral prosthesis component which comprises a head end thread sleeve and a tail end bolt, an inner thread groove is formed in the inner wall of the head end thread sleeve, the head end thread sleeve is of a hollow structure, the outer wall of the tail end bolt is arranged on the inner wall of the inner thread groove, the outer wall of the tail end bolt is fixedly connected with a steel plate, and the steel plate is fixedly connected with the head end thread sleeve. A transverse plate is fixedly connected to the lower surface of the steel plate, the position of the steel plate is perpendicular to the position of the transverse plate, an open groove is formed in the transverse plate, and two screw containing grooves are formed in the open groove. According to the utility model, when the prosthesis is applied to the upper cervical vertebra, the head end screw head is placed through the inclined groove and the connecting groove to avoid the lower jaw blocking, the tail end screw is vertically placed through the open groove to avoid the lower jaw blocking, and when the prosthesis is applied to the lower cervical vertebra, the prosthesis is rotated by 180 degrees to avoid the blocking of the sternum and the like, so that the screws are smoothly placed and fixed; and the effect of stably mounting the prosthesis at different parts is ensured.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to an artificial vertebral prosthesis assembly. Background Art

[0002] Currently, the most commonly used instrument in anterior cervical corpectomy and fusion is the titanium mesh combined with the anterior cervical plate. This method has been proven to provide sufficient stability for postoperative reconstruction of the cervical segment, thereby promoting fusion and preventing the titanium mesh from shifting or collapsing. It is widely used by spinal surgeons. The titanium mesh is a simple cylindrical structure, and during the operation, the operator's experience is relied on to trim both ends of it.

[0003] However, in the prior art, the end face of the titanium cage after trimming the titanium mesh cannot fit with the adjacent segment vertebrae, and the contact area is small, which affects the speed and quality of bone fusion. Moreover, the length cannot be adjusted, and at the same time, the nail insertion direction is blocked by the tissue structure, bringing great difficulties to nail insertion. Summary of the Utility Model

[0004] In order to make up for the above deficiencies, the utility model provides an artificial vertebral prosthesis assembly, aiming to improve the problems that the contact area of the prosthesis is small, affecting the speed and quality of bone fusion, the length of the prosthesis cannot be adjusted, and it is difficult to ensure the smooth insertion and fixation of the screw.

[0005] To achieve the above object, the utility model provides the following technical solutions:

[0006] An artificial vertebral prosthesis assembly includes a head-end screw sleeve and a tail-end bolt. The inner wall of the head-end screw sleeve is provided with an internal thread groove. The head-end screw sleeve is a hollow structure. The tail-end bolt is a hollow structure. A second U-shaped groove is opened inside the right side of the tail-end bolt. A through groove is opened inside the left side of the tail-end bolt. The outer wall of the tail-end bolt is arranged inside the inner wall of the internal thread groove. A steel plate is fixedly connected to the outer wall of the tail-end bolt. A cross plate is fixedly connected to the lower surface of the steel plate. The position of the steel plate is perpendicular to the position of the cross plate. A slot is opened inside the cross plate. Two screw placement grooves are arranged inside the slot.

[0007] Preferably, two inclined grooves are opened on the outer side of the head-end screw sleeve, and the inside of the head-end screw sleeve is communicated with the inclined grooves.

[0008] Preferably, two connecting grooves are opened at the upper end of the head-end screw sleeve, and the positions of the connecting grooves at the upper end of the head-end screw sleeve are inclined and corresponding to the positions of the inclined grooves.

[0009] Preferably, a first U-shaped groove is opened on the left side of the head-end screw sleeve, and the inside of the head-end screw sleeve is communicated with the first U-shaped groove.

[0010] Preferably, a fixing bolt is arranged inside the right side of the head-end screw sleeve. The outer wall of the fixing bolt communicates with the inner wall of the internal thread groove, and the outer wall of the fixing bolt is arranged on the inner wall of the second U-shaped groove.

[0011] The utility model has the following beneficial effects:

[0012] 1. In the utility model, when the prosthesis is applied to the upper cervical vertebra, the head inclination angle of the head-end screw is adjusted through the inclined groove and the connecting groove to avoid the obstruction of the mandible. The tail-end screw is vertically inserted through the slotted hole, and the obstruction of the mandible can also be avoided. When applied to the lower cervical vertebra, the prosthesis is rotated 180 degrees to avoid the obstruction of the sternum and the like, so as to achieve the smooth insertion and fixation of the screw, and ensure the stable installation of the prosthesis at different positions.

[0013] 2. In the utility model, based on the minimum sagittal length of the cervical vertebra body of Chinese people, the tail-end bolt is rotated to adjust its height position inside the head-end screw sleeve through the internal thread groove, and the fixing bolt locks the tail-end bolt to adjust the up-and-down length of the whole prosthesis to adapt to the length of the patient's vertebra body. That is, every time it is rotated one circle, a fixed length can be increased, achieving the effect of avoiding repeatedly selecting titanium meshes or supports of different lengths and saving the stocking cost of the prosthesis.

[0014] 3. In the utility model, the first U-shaped groove on the left side of the head-end screw sleeve increases the contact area to improve the speed and quality of bone fusion. At the same time, the hollow structure of the prosthesis provides a space for bone grafting, so as to enable the patient to recover the stability and function of the cervical vertebra earlier.

[0015] 4. In the utility model, only the steel plate on the side of the tail-end bolt protrudes from the vertebra body. Compared with the conventional steel plate, the length is greatly shortened, and the stimulation of the steel plate to the esophagus is reduced. Description of the Drawings

[0016] Figure 1 is a perspective view of an artificial vertebral body prosthesis assembly proposed by the utility model;

[0017] Figure 2 is a schematic diagram of the tail-end bolt of an artificial vertebral body prosthesis assembly proposed by the utility model;

[0018] Figure 3 is a schematic diagram of the fixing bolt of an artificial vertebral body prosthesis assembly proposed by the utility model.

[0019] Legend:

[0020] 1. Head-end screw sleeve; 2. Internal thread groove; 3. Tail-end bolt; 4. Steel plate; 5. Cross plate; 6. Slotted hole; 7. Inclined groove; 8. Connecting groove; 9. First U-shaped groove; 10. Fixing bolt; 11. Second U-shaped groove; 12. Through groove. Detailed Embodiment

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings of the specification of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0022] Referring to Figure 1 - Figure 3 , an embodiment provided by the present utility model: an artificial vertebral body prosthesis assembly, including a head-end screw sleeve 1 and a tail-end bolt 3. An internal thread groove 2 is provided on the inner wall of the head-end screw sleeve 1. The head-end screw sleeve 1 is of a hollow structure, and the tail-end bolt 3 is of a hollow structure. A second U-shaped groove 11 is provided inside the right side of the tail-end bolt 3, and a through groove 12 is provided inside the left side of the tail-end bolt 3. The outer wall of the tail-end bolt 3 is arranged on the inner wall of the internal thread groove 2. A steel plate 4 is fixedly connected to the outer wall of the tail-end bolt 3. A cross plate 5 is fixedly connected to the lower surface of the steel plate 4. The position of the steel plate 4 is perpendicular to the position of the cross plate 5. A slot 6 is provided inside the cross plate 5, and two screw placement grooves are provided inside the slot 6.

[0023] Specifically, by rotating the tail-end bolt 3, the tail-end bolt 3 can rotate through the internal thread groove 2 to adjust the length of the tail-end bolt 3 on the inner wall of the head-end screw sleeve 1, so as to adjust the overall up-and-down length of the prosthesis to adapt to the length of the patient's vertebral body.

[0024] Referring to Figure 1 - Figure 3 , two inclined grooves 7 are provided on the outer side of the head-end screw sleeve 1, and the inside of the head-end screw sleeve 1 communicates with the inclined grooves 7;

[0025] Specifically, the head-end screw sleeve 1 can provide the required space when the head-end screw is screwed into the inclined groove 7 at an inclination angle.

[0026] Referring to Figure 1 - Figure 3 , two connecting grooves 8 are provided at the upper end of the head-end screw sleeve 1, and the positions of the connecting grooves 8 at the upper end of the head-end screw sleeve 1 are inclined corresponding to the positions of the inclined grooves 7;

[0027] Specifically, the connecting grooves 8 cooperate with the inclined grooves 7 screwed in at an inclination angle to jointly achieve more stable fixation of the head-end screw.

[0028] Referring to Figure 1 - Figure 3 , a first U-shaped groove 9 is provided on the left side of the head-end screw sleeve 1, and the inside of the head-end screw sleeve 1 communicates with the first U-shaped groove 9;

[0029] Specifically, the head-end screw sleeve 1 is part of the prosthesis. The first U-shaped groove 9 on its side can create more favorable conditions for bone fusion. The through groove 12 corresponds to the position of the first U-shaped groove 9. Through the through groove 12, the contact area between the inner bone graft and the outer vertebral body is increased, which helps to guide the growth of bone tissue towards the opening and accelerate the fusion process.

[0030] Refer to Figure 1 - Figure 3 Inside the right side of the head-end screw sleeve 1, a fixing bolt 10 is provided. The outer wall of the fixing bolt 10 communicates with the inner wall of the internal thread groove 2, and the outer wall of the fixing bolt 10 is arranged on the inner wall of the second U-shaped groove 11.

[0031] Specifically, after turning the tail-end bolt 3 to rotate inside the inner wall of the internal thread groove 2 to a suitable position, then turn the fixing bolt 10 to perform thread rotation inside the head-end screw sleeve 1 until it contacts the inner wall of the second U-shaped groove 11 opened by the tail-end bolt 3, so as to fix the position of the tail-end bolt 3 on the inner wall of the internal thread groove 2 and ensure the overall stability of the prosthesis.

[0032] Working principle: When the prosthesis assembly is needed, first, the technician can rotate the tail-end bolt 3 to perform thread rotation inside the inner wall of the internal thread groove 2. Then, the tail-end bolt 3 can adjust its height position inside the head-end screw sleeve 1 through the internal thread groove 2. Then turn the fixing bolt 10 to contact the inner wall of the second U-shaped groove 11 opened by the tail-end bolt 3 to fix the position of the tail-end bolt 3. Furthermore, for each rotation, the fixed length can be increased to adjust the up and down length of the entire prosthesis to adapt to the length of the patient's vertebra. After that, when the prosthesis is placed on the patient's upper cervical vertebra, the screw head can be obliquely screwed into the inner wall of the connecting groove 8 through the inclined groove 7 after passing through the inner wall of the head-end screw sleeve 1, which can avoid the obstruction of the mandible when screwing the screw head. And then, by screwing the vertical screw through the slotted opening 6 opened by the cross plate 5, the obstruction of the mandible can also be avoided. When the prosthesis is applied to the lower vertebra, the entire prosthesis is rotated 180 degrees. By screwing in the screw, the obstruction of the sternum and other parts can be avoided, so that the screw can be smoothly inserted and effectively fixed, ensuring the stable installation of the prosthesis in different parts. After the prosthesis is implanted, the first U-shaped groove 9 on the left side of the head-end screw sleeve 1 can increase the contact area with the outer vertebral body through the through groove 12 to improve the speed and quality of bone fusion. At the same time, the hollow structure of the prosthesis can provide a space for bone grafting to enable the patient to recover the stability and function of the cervical vertebra earlier.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An artificial vertebral prosthesis assembly, comprising a head end screw sleeve (1) and a tail end bolt (3), characterized in that: The inner wall of the head end screw sleeve (1) is provided with an internal thread groove (2), the head end screw sleeve (1) is a hollow structure, the tail end bolt (3) is a hollow structure, a second U-shaped groove (11) is provided inside the right side of the tail end bolt (3), a through groove (12) is provided inside the left side of the tail end bolt (3), the outer wall of the tail end bolt (3) is arranged on the inner wall of the internal thread groove (2), the outer wall of the tail end bolt (3) is fixedly connected to a steel plate (4), the lower surface of the steel plate (4) is fixedly connected to a transverse plate (5), the position of the steel plate (4) is perpendicular to the position of the transverse plate (5), and the interior of the transverse plate (5) is provided with a groove (6).

2. An artificial vertebral prosthesis assembly according to claim 1, characterized in that: Two oblique grooves (7) are provided on the outer side of the head end screw sleeve (1), and the interior of the head end screw sleeve (1) is communicated with the oblique grooves (7).

3. The artificial vertebral prosthesis assembly according to claim 2, characterized in that: Two connecting grooves (8) are provided at the upper end of the head end screw sleeve (1), and the positions of the connecting grooves (8) at the upper end of the head end screw sleeve (1) are inclined correspondingly to the positions of the inclined grooves (7).

4. The artificial vertebral prosthesis assembly according to claim 3, characterized in that: A first U-shaped groove (9) is provided on the left side of the head end screw sleeve (1), and the interior of the head end screw sleeve (1) is communicated with the first U-shaped groove (9).

5. The artificial vertebral prosthesis assembly according to claim 1, characterized in that: A fixing bolt (10) is arranged inside the right side of the head end screw sleeve (1), the outer wall of the fixing bolt (10) is communicated with the inner wall of the internal thread groove (2), and the outer wall of the fixing bolt (10) is arranged on the inner wall of the second U-shaped groove (11).

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