A cervical vertebrae steel plate with a self-locking structure

Abstract

The present invention relates to a cervical vertebra steel plate with a self-locking structure, a steel plate body, a backstop sliding block and an elastic component, a plurality of pairs of countersunk holes are arranged on the steel plate body, and a mounting groove is arranged between two pairs of countersunk holes, and a sink groove is arranged in the mounting groove; the elastic component is installed in the sink groove; in the two pairs of countersunk holes, the backstop sliding block can slide from one of the countersunk holes toward the other countersunk hole and be installed in the mounting groove in cooperation; the backstop sliding block covers the elastic component, and in the state of not being subjected to external force, the elastic component can lock the backstop sliding block in the middle position of the mounting groove. The present invention has a simple structure, is easy to operate in surgical use, can automatically prevent the bone screw from withdrawing, and is safe and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of orthopedic medical devices, and particularly relates to a cervical vertebrae steel plate with a self-locking structure. Background Art

[0002] Due to the complex anatomical structure of the human cervical spine and its surroundings, the esophagus and trachea are distributed in front of the cervical spine, and there are abundant blood vessels and nerves distributed around it. At the same time, the cervical vertebrae move frequently and with a large range of motion. How to effectively fix the cervical plate on the cervical vertebrae for a long time to prevent the bone screws from loosening and withdrawing has always been a major clinical problem; if the bone screws that fix the cervical plate loosen and withdraw from the plate, it will cause internal fixation failure. In mild cases, the patient will need a second repair surgery. In severe cases, the esophagus and blood vessels will be scratched by the withdrawn screws, leading to a series of complications.

[0003] Although the cervical vertebrae plates currently used in clinical practice are equipped with anti-withdrawal structures for bone screws, most of them are locked by screwing in other screws or slots after the bone screws are fixed. Screwing in other screws not only increases the surgical operation time, but also makes the locking unreliable. There is still a safety hazard of screw withdrawal, and the locking device has a short service life. The structure of the slot is mostly a disposable mechanism. After the bone screw is screwed in, it cannot be removed again. If the patient's cervical spine is diseased again, the difficulty of re-operation is increased because the bone screw is not easy to remove. Summary of the invention

[0004] The purpose of the present invention is to provide a cervical vertebrae steel plate with a self-locking structure to solve the problem that bone screws are easy to withdraw.

[0005] The cervical vertebrae steel plate with a self-locking structure of the present invention is realized as follows:

[0006] A cervical vertebrae steel plate with a self-locking structure, comprising

[0007] A steel plate body is provided with a plurality of pairs of countersunk holes, and a mounting groove is provided between each pair of countersunk holes, and a countersunk groove is provided in each mounting groove;

[0008] An elastic component capable of being cooperatively mounted in the sink;

[0009] A stop sliding block, which can slide from one of the two countersunk holes in the pair toward the other countersunk hole, and then cover the elastic component to be matched and installed in the installation groove;

[0010] Among them, after the steel plate body, the elastic component and the anti-retraction sliding block are assembled in place, the elastic component locks the anti-retraction sliding block in the installation groove without being subjected to external force, thereby preventing the bone screws on the cervical vertebrae steel plate from loosening.

[0011] Furthermore, concave sliding guide rails are respectively provided on both sides of the installation groove, and side wings cooperating with the sliding guide rails are provided on both sides of the anti-retraction sliding block.

[0012] Furthermore, the mounting groove is communicated with the countersunk parts of the countersunk holes at both ends thereof.

[0013] Furthermore, the length of the anti-retraction sliding block is greater than the length of the installation groove.

[0014] Furthermore, both ends of the anti-retraction sliding block are provided with inwardly concave arc-shaped notches.

[0015] Furthermore, the elastic component is an outwardly convex arc structure;

[0016] The arc height of the elastic component is greater than 0.1-1 mm of the depth of the sinking groove.

[0017] Furthermore, a locking groove is provided on the inner side surface of the anti-retraction sliding block, and the arc top of the elastic component is stuck in the locking groove.

[0018] Furthermore, the width of the locking recessed groove differs from the width of the recessed groove by no more than ±2 mm;

[0019] The width of the elastic component is not less than the width of the locking recess and the width of the recess.

[0020] Furthermore, strip-shaped notches are sequentially staggered on both side edges of the elastic component.

[0021] Furthermore, an inwardly concave arc-shaped notch is arranged on the periphery of the steel plate body.

[0022] After adopting the above technical solution, the present invention has the following beneficial effects:

[0023] The present invention can realize automatic locking of bone screws by installing a stop-retraction sliding block and an elastic component on the cervical vertebrae steel plate. The stop-retraction effect is firm and reliable, and the bone screws and the cervical vertebrae steel plate can be removed as needed, which is convenient for cervical vertebrae repair surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is an exploded view of a cervical vertebrae steel plate with a self-locking structure according to a preferred embodiment of the present invention;

[0026] Figure 2 It is a structural diagram of a steel plate body of a cervical vertebrae steel plate with a self-locking structure according to a preferred embodiment of the present invention;

[0027] Figure 3It is a structural diagram of a thrust sliding block of a cervical vertebrae steel plate with a self-locking structure according to a preferred embodiment of the present invention;

[0028] Figure 4 yes Figure 3 Cross-section view in the AA direction;

[0029] Figure 5 It is a structural diagram of an elastic component of a cervical vertebrae steel plate with a self-locking structure according to a preferred embodiment of the present invention;

[0030] Figure 6 This is a diagram of the use state of the cervical vertebrae steel plate with a self-locking structure according to a preferred embodiment of the present invention;

[0031] Figure 7 is a cross-sectional view of the use process of the cervical vertebrae steel plate with a self-locking structure according to a preferred embodiment of the present invention;

[0032] In the figure: the steel plate body 1, the countersunk hole 11, the mounting groove 12, the sink groove 13, the arc-shaped notch 14, the window 15, the sliding guide rail 16, the anti-retraction sliding block 2, the side wing 21, the arc-shaped notch 22, the locking sink groove 23, the elastic component 3, the strip notch 31, and the bone screw 4. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-7 As shown, a cervical vertebra steel plate with a self-locking structure comprises a steel plate body 1, a backstop sliding block 2 and an elastic component 3. A plurality of pairs of countersunk holes 11 are arranged on the steel plate body 1, and mounting grooves 12 are arranged between two pairs of countersunk holes 11, and countersunk grooves 13 are arranged in the mounting grooves 12; the elastic component 3 can be fitted in the countersunk grooves 13; the backstop sliding block 2 can slide from one of the two pairs of countersunk holes 11 toward the other countersunk hole 11, and then cover the elastic component 3, so as to be fitted in the mounting grooves 12; after the steel plate body 1, the elastic component 3 and the backstop sliding block 2 are assembled in place, the elastic component 3 locks the backstop sliding block 2 in the mounting grooves 12 when no external force is applied, thereby preventing the bone screws of the cervical vertebra steel plate from loosening.

[0036] In order to prevent the anti-retraction sliding block 2 from falling off from the installation groove 12 , concave sliding guide rails 16 are respectively provided on both sides of the installation groove 12 , and side wings 21 cooperating with the sliding guide rails 16 are provided on both sides of the anti-retraction sliding block 2 .

[0037] In this embodiment, the sliding guide rail 16 is arranged on the upper and lower sides of the mounting groove 12, and its cross-section is triangular. It is directly connected with the mounting groove 12 to form a groove body structure with a bottom surface size larger than the opening size, and the side wings 21 also extend to the upper and lower sides of the anti-retraction sliding block 2, and cooperate with the structure of the sliding guide rail 16, so as to prevent the anti-retraction sliding block 2 from falling directly outward from the mounting groove 12 and lock it in the mounting groove 12.

[0038] The structure of the sliding guide rail 16 is not limited to the above-mentioned triangular cross-section shape. The cross-section can be a regular shape such as a rectangle, trapezoid or other irregular shapes. It only needs to ensure that the sliding guide rail 16 is a concave structure and can prevent the anti-retraction sliding block 2 from falling off.

[0039] In order to facilitate the installation and removal of the anti-retraction sliding block 2, the installation groove 12 is communicated with the countersunk parts of the countersunk holes 11 at both ends thereof.

[0040] During installation, the anti-retraction sliding block 2 is installed from the countersunk part of one of the countersunk holes 11 so that the side wings 21 cooperate with the sliding guide rails 16 , and the anti-retraction sliding block 2 is slid toward the other countersunk hole 11 , thereby installing it into the installation groove 12 .

[0041] The countersunk hole 11 is used to install the bone screw 4, which passes through the steel plate body 1 and is fixed on the vertebral body. In order to use the anti-retraction sliding block 2 to prevent the bone screw 4 from withdrawing, the length of the anti-retraction sliding block 2 is greater than the length of the installation groove 12.

[0042] After the anti-retraction sliding block 2 is installed in the installation groove 12 and placed in the middle position, both ends of the anti-retraction sliding block 2 can be pressed tightly against the nail tail of the bone screw 4, thereby preventing the bone screw 4 from withdrawing.

[0043] The nail tail of the bone screw 4 is provided with an inner hexagonal operating groove. In order to facilitate the disassembly and assembly of the bone screw 4, both ends of the anti-retraction sliding block 2 are provided with inwardly concave arc-shaped grooves 22.

[0044] The arc-shaped notch 22 can avoid the operation slot structure such as the hexagonal socket, so that it is convenient to cooperate with the screwdriver. When installing the bone screw 4 on one side, the arc-shaped notch 22 can also make the anti-retraction sliding block 2 cooperate with the bone screw 4, so that it is convenient to push the anti-retraction sliding block 2 to the other side, which is convenient for the disassembly and assembly of the bone screw 4.

[0045] In order to lock the anti-retraction sliding block 2 through the elastic component 3, the elastic component 3 is an outwardly convex arc structure.

[0046] The arc height of the elastic component 3 is greater than the depth of the groove 13 by 0.1-1 mm.

[0047] In order to achieve the cooperation between the anti-retraction sliding block 2 and the elastic component 3 , a locking groove 23 is provided on the inner side surface of the anti-retraction sliding block 2 , and the arc top of the elastic component 3 is stuck in the locking groove 23 .

[0048] The arc height of the elastic component 3 is higher than the depth of the groove 13, so that when the elastic component 3 is placed in the groove 13, the arc top of the elastic component 3 can extend from the groove 13 and abut against the locking groove 23 of the anti-retraction sliding block 2, thereby fixing the side wings 21 of the anti-retraction sliding block 2 in the sliding guide rail 16, preventing the anti-retraction sliding block 2 from moving in any direction in the installation groove 12, thereby locking the anti-retraction sliding block 2.

[0049] In order to ensure that the elastic component 2 fits in both the locking recess 23 and the recess 13 at the same time, the difference between the width of the locking recess 23 and the width of the recess 13 does not exceed ±2 mm.

[0050] Preferably, the width of the locking recessed groove 23 is equal to the width of the recessed groove 13 , so that the elastic component 3 can be fixed in both the locking recessed groove 23 and the recessed groove 13 at the same time.

[0051] The width here refers to the left and right width in the parallel direction of the two countersunk holes 11. The elastic component 3 is used to fix the anti-retraction sliding block 2. When the elastic component 3 is installed in the sink groove 13 and cooperates with the locking sink groove 23, the elastic component 3 will not move left and right without external force.

[0052] In order to ensure the fixation of the elastic component 3 , the width of the elastic component 3 is not less than the width of the locking recess 23 and the width of the recess 13 .

[0053] When the elastic component 3 is installed in the groove 13 and the locking groove 23, it is in a transverse pre-compression state, and its two ends are respectively against the inner walls of the groove 13 and the inner walls of the locking groove 23. Only when an external force is applied to the left or right on the anti-retraction sliding block 2, can the elastic component 3 be compressed in the same direction of the force, thereby realizing the sliding of the anti-retraction sliding block 2 to the left or right.

[0054] In order to ensure that the anti-retraction sliding block 2 can slide left and right when subjected to force but cannot separate from the steel plate body 1, strip-shaped notches 31 are sequentially staggered on both side edges of the elastic component 3.

[0055] Specifically, the strip-shaped slot 31 is a longitudinal slot, that is, its length direction is perpendicular to the moving direction of the anti-retraction sliding block 2 .

[0056] When the bone screw 4 on one side needs to be removed, the anti-retraction sliding block 2 is pressed by its tail end to move the anti-retraction sliding block 2 to the other side, thereby avoiding the bone screw 4 to be removed and removing it from the steel plate body 1. The provision of the strip-shaped notch 31 can facilitate the elastic component 3 to produce lateral deformation, that is, to facilitate the movement of the anti-retraction sliding block 2 between the two paired bone screws 4.

[0057] In order to reduce the weight of the entire steel plate body 1 and to better fit the cervical spine, an inwardly concave arc-shaped notch 14 is provided on the periphery of the steel plate body 1 .

[0058] Preferably, a viewing window 15 is provided between two adjacent pairs of countersunk holes 11 to facilitate observation of the fit between the steel plate body 1 and the cervical vertebrae, as well as the installation of the bone screws 4 .

[0059] When assembling the cervical vertebrae steel plate, first place the elastic component 3 in the sink groove 13, then insert the anti-retraction sliding block 2 from the countersunk part of one of the countersunk holes 11 into the installation groove 12 in the direction of the other countersunk hole 11, and at the same time press the elastic component 3 into the sink groove 13 so that the anti-retraction sliding block 2 can continue to be inserted. After the anti-retraction sliding block 2 is installed in place, the elastic component 3 will automatically bounce up due to its own elasticity, and the arc top of the elastic component 3 will be stuck in the locking sink groove 23 of the anti-retraction sliding block 2, preventing the anti-retraction sliding block 2 from being separated from the steel plate body 1. At this point, the cervical vertebrae steel plate is assembled.

[0060] In the initial state, the elastic component 3 causes the anti-retraction sliding block 2 to be located in the middle position of the cervical vertebrae steel plate, that is, its locking position.

[0061] During the operation, the bone screw 4 is screwed into the bone screw 4 along the countersunk hole 11 on the steel plate body 1. As the bone screw 4 is screwed into the vertebral body, the tail end of the bone screw 4 will squeeze the anti-retraction sliding block 2 to make it move to one end so that the bone screw 4 can continue to be screwed into the vertebral body. At the same time, the squeezed anti-retraction sliding block 2 will compress the elastic component 3 toward the other end. When the bone screw 4 is installed in place, the compressed elastic component 3 will automatically rebound and bounce the anti-retraction sliding block 2 back to the initial locking state, thereby jamming the bone screw 4. The implantation of the bone screws 4 in the opposite nail holes is completed in sequence. After all the bone screws 4 are installed in place, the elastic component 3 will automatically drive the anti-retraction sliding block 2 to the initial locking position, thereby completing the locking of the bone screw 4 and preventing it from withdrawing.

[0062] The spinal plate disclosed in the present invention is easy to operate during surgery, easy to install, automatically locks the bone screw 4, and has a firm and reliable anti-retraction effect. If the patient's fixed vertebral body is diseased again, the anti-retraction sliding block 2 can be pushed toward the bone screw 4 at one end by a tool to expose the bone screw 4 at the other end, and then the bone screw 4 and the cervical plate can be removed by a bone screw driver, so as to facilitate the repair of the cervical spine.

[0063] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A cervical vertebrae steel plate with a self-locking structure, characterized in that: include A steel plate body (1) is provided with a plurality of pairs of countersunk holes (11), and a mounting groove (12) is provided between two pairs of countersunk holes (11), and a countersunk groove (13) is provided in the mounting groove (12); An elastic component (3) capable of being mounted in the sink (13); A stop sliding block (2) capable of sliding from one of the two countersunk holes (11) in a pair toward the other countersunk hole (11), thereby covering the elastic component (3) to be mounted in the mounting groove (12); Wherein, after the steel plate body (1), the elastic component (3) and the anti-retraction sliding block (2) are assembled in place, the elastic component (3) locks the anti-retraction sliding block (2) in the installation groove (12) in the absence of external force, thereby preventing the bone screws on the cervical vertebra steel plate from loosening; The elastic component (3) is an outwardly convex arc-shaped structure; The arc height of the elastic component (3) is greater than the depth of the sink groove (13), and the difference between the arc height and the depth of the sink groove (13) is 0.1-1 mm; The inner side surface of the anti-retraction sliding block (2) is provided with a locking recessed groove (23), and the arc top of the elastic component (3) is clamped in the locking recessed groove (23).

2. The cervical vertebrae steel plate with a self-locking structure according to claim 1, characterized in that: Inwardly concave sliding guide rails (16) are respectively provided on both sides of the installation groove (12), and side wings (21) cooperating with the sliding guide rails (16) are provided on both sides of the stop sliding block (2).

3. The cervical vertebrae steel plate with a self-locking structure according to claim 1, characterized in that: The mounting groove (12) is in communication with the countersunk portions of the countersunk holes (11) at both ends thereof.

4. The cervical vertebrae steel plate with a self-locking structure according to claim 1, characterized in that: The length of the anti-retraction sliding block (2) is greater than the length of the installation groove (12).

5. The cervical vertebrae steel plate with a self-locking structure according to claim 1, characterized in that: Both ends of the stop sliding block (2) are provided with inwardly concave arc-shaped notches (22).

6. The cervical vertebrae steel plate with a self-locking structure according to claim 1, characterized in that: The difference between the width of the locking recess (23) and the width of the recess (13) does not exceed ±2 mm; The width of the elastic component (3) is not less than the width of the locking recess (23) and the width of the recess (13).

7. The cervical vertebrae steel plate with a self-locking structure according to claim 1, characterized in that: Strip-shaped notches (31) are sequentially staggered on both side edges of the elastic component (3).

8. The cervical vertebrae steel plate with a self-locking structure according to claim 1, characterized in that: An inwardly concave arc-shaped notch (14) is provided on the periphery of the steel plate body (1).

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