CN210408576U

CN210408576U - Anterior cervical internal fixation system

Info

Publication number: CN210408576U
Application number: CN201920701322.7U
Authority: CN
Inventors: 曹庆宏; 房友飞; 金航军; 乔晗; 刘雪萍; 宋风霞; 陈帅帅; 李学忠; 刘铁箭; 梁刚; 闫驰辉; 陈秋亮; 刘瑜; 张玉; 袁黎明
Original assignee: Shandong Xinhua Joint Orthopaedics Equipment Co ltd
Current assignee: Shandong Xinhua Joint Orthopaedics Equipment Co ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-04-28
Anticipated expiration: 2029-05-15

Abstract

The utility model provides a cervical vertebra way of escape internal fixation system abstract the utility model discloses a way of escape internal fixation system for way of escape discectomy or centrum time excision postoperative, carry out the internal fixation mode treatment to the way of escape internal fixation, belong to medical instrument technical field. The fixation system includes a bone plate and a screw, characterized by: the bone plate is provided with an axe-shaped cover plate in advance, and the tail part of the screw can be locked and covered in one step; this anterior cervical spine internal fixation system utilizes the screw to pass the fixed neck centrum of hole diameter on the hone lamella, reaches the effect of fixed and stable centrum immediately after the postoperative, can share load with the bone grafting piece, promotes the bone grafting and fuses. Bone plates and screws come in a variety of different sizes to meet the needs of various patients.

Description

Anterior cervical internal fixation system

Technical Field

The utility model relates to an anterior cervical internal fixation system for the anterior intervertebral discectomy or the inferior total excision of centrum postoperative, carry out the internal fixation mode treatment to the anterior cervical, belong to medical instrument technical field.

Background

The internal fixation operation of the anterior cervical steel plate is a better method for stabilizing the cervical vertebra in the anterior cervical operation, and the internal fixation is carried out by reducing the pressure of the anterior way (intervertebral disc excision or vertebral body secondary excision), implanting self bones, and then using the steel plate and screws on the anterior edge of the vertebral body to obtain the purposes of stabilizing the cervical vertebra, fixing bone grafting blocks, promoting the fusion of the bone grafting area and recovering the normal intervertebral height, physiological curvature and vertebral canal volume.

The anterior internal fixation operation is just fixed on the loading area of the motion segment in terms of biomechanics, and creates favorable conditions for bone grafting fusion and deformity correction. The anterior cervical internal fixation has the advantages of simple anatomy, low risk, complete decompression, load sharing and the like, has small damage to the stability of a spinal motion unit, can reconstruct the middle and anterior columns of the spinal column to the maximum extent, enables the spinal column to recover the normal sequence, and has larger spinal cord and nerve function recovery, so the anterior cervical internal fixation is more effective and is widely applied in recent years.

Although the function of the anterior cervical steel plate is well established, the related complications are not negligible, and the anterior cervical steel plate can cause screw loosening and fracture. Loosening and breaking of the screw not only poses a potential risk to surrounding vital soft tissue, but also makes internal fixation susceptible to failure, thereby affecting the healing of the bone graft. Loosening and displacement of the screw is often the result of the weak force of the screw engaging the bone, especially in osteoporotic patients. The local mechanical instability is the fundamental factor, the force of the screw for engaging with the bone is gradually weakened, and finally the screw is loosened and withdrawn.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an anterior cervical vertebra bone plate fixing system which is simple in operation and reliable in fixation.

The utility model provides a technical scheme that above-mentioned problem adopted is: an anterior cervical internal fixation system comprising a bone plate and a screw, wherein: the thickness of the bone plate is 2.0mm, the axe-shaped cover plate is arranged on the bone plate in advance, the tail of the screw is covered and locked through radial rotating extrusion, the bone plate can be matched with an angle-adjustable screw or an angle-fixed screw, and the screw penetrates through the hole diameter of the bone plate to fix the cervical vertebra.

Further, the screw is a self-tapping and self-drilling adjustable angle screw or a fixed angle screw.

Further, the outer diameter of the screw is kept consistent, and the thread of the cortical bone at the proximal end of the screw is double-thread.

Further, the inner diameter of the screw is in a double-core mode, the far end of the screw is cylindrical, and the near end of the screw is conical.

Furthermore, the bone plate is pre-bent according to the physiological curvature of a human body, the sagittal plane is pre-bent by 170 degrees, and the cross section is pre-bent by 30 degrees.

Furthermore, the adjustable range of the axis of the angle-adjustable screw in the sagittal plane of the bone plate can reach 17 degrees, and the adjustable range of the angle in the transverse plane of the bone plate can reach 15 degrees; the fixed angle screw axis is 10 ° flared in the sagittal plane of the plate and 6 ° cohesive in the transverse plane of the plate.

Compared with the prior art, the utility model, following beneficial effect has: 1. the fixing system is simple to operate and reliable in fixing, the pre-bending degree of the bone plate can be well attached to a vertebral body, the screws are arranged in screw holes of the bone plate, the screws with fixed angles or adjustable angles can be selected according to bone of a patient and different conditions, when the nail plate moves relatively, the effect of dynamically pressurizing a bone grafting block can be achieved, load sharing is improved, and bone grafting fusion is promoted; 2. the inner diameter of the screw adopts a double-core type, the cylindrical inner core can provide strong bone holding force for the screw, the screw is prevented from withdrawing, the conical inner core provides strong load bearing capacity for the screw, and the fatigue fracture resistance of the screw is enhanced. The outer diameter of the screw is kept consistent, the cortical bone thread at the near end of the screw adopts a double-thread design, the screw holding force is enhanced by the double-thread design, and the mechanical stability of the screw is improved. 3. The abduction angle and the cohesion angle of the fixed angle screw accord with the fixed 'tension band principle', the fixed angle screw is not easy to loosen or withdraw, and meanwhile, the adaptability of the adjustable angle screw is enhanced due to the wide angle range of the adjustable angle screw. 4. The thickness of the bone plate is closely related to the strength of the bone plate, the anterior cervical bone plate is provided with an observation window according to the anatomical form of each vertebral body, the thickness of the bone plate is 2.0mm, the stimulation to the esophagus is effectively reduced, the rigidity of the bone plate can be reduced, the stress distribution is uniform, and meanwhile, a wide observation visual field is provided.

Drawings

Fig. 1 is a perspective view of an anterior cervical internal fixation system.

Fig. 2 is a top view of a plate of an anterior cervical internal fixation system.

Fig. 3 is a schematic view of an axe-shaped cover plate of an anterior cervical internal fixation system.

Fig. 4 is a sagittal plane screw angle view of an anterior cervical fixation system.

Fig. 5 is a cross-sectional screw angle schematic view of an anterior cervical internal fixation system.

Fig. 6 is a schematic view of an adjustable angle screw of an anterior cervical internal fixation system.

Fig. 7 is a schematic view of a fixed angle screw of an anterior cervical internal fixation system.

In the figure: 1. the bone plate 11, a screw hole 12, a matching spherical surface 13, a boss 14, a concave hole 2, a screw 21, an adjustable angle screw extrusion surface 22, a screw spherical surface 23, an adjustable angle screw neck diameter 24, a double thread 25, a conical inner core 26, a cylindrical inner core 27, a fixed angle screw extrusion surface 28, a fixed angle neck diameter 3, an axe-shaped cover plate 31, a rotating notch 32, a cylindrical hole 33, an inclined plane 4 and an observation window.

Detailed Description

Fig. 1 to 7 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 7.

The utility model provides a cervical spine way of escape internal fixation system includes hone lamella 1 and screw 2, is equipped with axe type apron 3 in advance on the hone lamella 1, and axe type apron 3 is installed in the shrinkage pool 14 on the hone lamella 1, through the steel ball with boss 13 on the hone lamella 1 and the riveting of the cylindrical hole 32 on the axe type apron 3, fixes axe type apron 3 on hone lamella 1, through the instrument with hold rotatory notch 31, radial rotation covers the tail of screw 2 to through inclined plane 33 and adjustable angle screw extrusion face 21 or fixed angle extrusion face 27 locking screw. The adjustable angle screw neck diameter 23 or the fixed angle neck diameter 28 can pass through the screw hole 11 of the bone plate 1, and the matching spherical surface 12 of the bone plate 1 is respectively matched with the screw spherical surface 22, so that the screw 2 can realize the functions of adjusting the angle or fixing the angle.

The screw 2 is arranged in the screw hole 11 of the bone plate 1, the fixed angle or the adjustable angle screw can be selected according to the bone quality of a patient and different conditions, and the cervical vertebra is fixed by the screw 2 through the screw hole 11 of the bone plate. When the nail plate moves relatively, the effect of dynamic pressurization on the bone grafting block can be achieved, load sharing is improved, and bone grafting fusion is promoted. The thickness and the intensity of bone plate 1 are closely related, and the anterior cervical vertebra bone plate is equipped with observation window 4 according to the anatomical form of every centrum, and bone plate thickness is 2.0mm, can effectively reduce the stimulation to the esophagus to can reduce bone plate rigidity, provide wide observation visual field when guaranteeing that stress distribution is even.

As shown in fig. 4 and 5, the adjustable angle of the axis of the screw can reach 17 degrees in the sagittal plane of the bone plate 1 and 15 degrees in the transverse plane of the bone plate 1; the fixed angle screw axis is 10 deg. flared in the sagittal plane of the plate 1 and 6 deg. cohesive in the transverse plane of the plate 1. The abduction angle and the cohesion angle of the fixed angle screw accord with the fixed 'tension band principle', the fixed angle screw is not easy to loosen or withdraw, and meanwhile, the adaptability of the adjustable angle screw is enhanced due to the wide angle range of the adjustable angle screw.

As shown in fig. 6 and 7, the adjustable angle screw or fixed angle inner diameter is of the dual core type, with a cylindrical inner core 26 at the distal end of the screw and a conical inner core 25 at the proximal end. The outer diameter of the screw 2 is kept consistent, and the screw proximal cortical bone thread adopts double threads 24. The cylindrical inner core 26 can provide strong holding force for the screw 2, the screw 2 is prevented from being withdrawn, the conical inner core 25 provides strong load bearing capacity for the screw 2, the fatigue fracture resistance of the screw 2 is enhanced, the outer diameter of the screw 2 is kept consistent, the holding force of the screw 2 is enhanced by the double threads 24, and the mechanical stability of the screw 2 is improved.

Claims

1. An anterior cervical internal fixation system comprising a bone plate (1) and a screw (2), characterized in that: the axe-shaped cover plate (3) is arranged on the bone plate (1) in advance, the tail part of the screw (2) can be locked and covered in one step, and the screw (2) penetrates through a screw hole (11) on the bone plate (1) to fix the cervical vertebra.

2. An anterior cervical internal fixation system according to claim 1, wherein: the screw (2) is an adjustable angle screw or a fixed angle screw which is self-tapping and self-drilling.

3. An anterior cervical internal fixation system according to claim 1, wherein: the outer diameter of the screw (2) is kept consistent, and the thread of the near-end cortical bone of the screw (2) adopts double threads (24).

4. An anterior cervical internal fixation system according to claim 1, wherein: the inner diameter of the screw (2) adopts a double-core type, the far end of the screw adopts a cylindrical inner core (26), and the near end of the screw adopts a conical inner core (25).

5. An anterior cervical internal fixation system according to claim 1, wherein: the bone plate (1) is pre-bent according to the physiological curvature of a human body, the sagittal plane is pre-bent by 170 degrees, and the cross section is pre-bent by 30 degrees.

6. An anterior cervical internal fixation system according to claim 1, wherein: when the screw (2) is an angle-adjustable screw, the axial line adjustable range of the angle-adjustable screw can reach 17 degrees in the sagittal plane of the bone plate (1), and the axial line adjustable range of the angle-adjustable screw can reach 15 degrees in the cross section of the bone plate (1); when the screw (2) is a fixed angle screw, the fixed angle screw axis extends 10 degrees out of the sagittal plane of the bone plate (1) and is 6 degrees cohesive in the transverse plane of the bone plate (1).

7. An anterior cervical internal fixation system according to claim 1, wherein: the bone plate (1) is provided with an observation window (4), and the observation window (4) can provide a wider observation field in operation.

8. An anterior cervical internal fixation system according to claim 1, wherein: the thickness of the bone plate (1) is 2.0 mm.