Anterior cervical self-locking plate

Abstract

The utility model discloses a cervical anterior self-locking steel plate, including a butterfly-shaped fixed steel plate, a plurality of mutually symmetrical limiting holes are opened downwardly at the edge of the upper end of the fixed steel plate, a mounting hole penetrating the fixed steel plate is opened downwardly at the limiting hole, a self-locking plate is arranged between every two adjacent limiting holes of the fixed steel plate, a movable groove is opened downwardly at the self-locking plate, and two inner walls of the movable groove are provided with limiting card slots inwardly, and an elastic locking steel wire is arranged in the movable groove, and the elastic locking steel wire includes a limiting steel wire strip extending into one of the limiting card slots, a self-locking steel wire connected to both ends of the limiting steel wire strip and extending to the top of the corresponding limiting hole, a limiting hook connected to the free end of the self-locking steel wire and bent inwardly to form a limiting hook, and a steel wire strip for preventing loosening connected to the free end of the limiting hook and extending into another limiting card slot. The utility model limits the screws by elastic self-locking, and eliminates the hidden danger of the screws loosening and falling off.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic instruments, in particular to an anterior cervical vertebra self-locking steel plate. Background Art

[0002] Anterior cervical plates play a key role in spinal surgery, used to fix cervical fractures, dislocations or herniations, and to restore cervical stability. However, bone screws may become loose or even fall out during plate fixation due to a variety of reasons (such as insufficient friction, uneven force, premature postoperative activity, etc.), which not only affects the surgical effect, but may also cause secondary injuries to patients.

[0003] In order to solve this problem, the patent with publication number CN208659527U proposes a spiral groove locking device for anterior cervical vertebrae plate. The device sets a spiral locking cap on the anterior cervical vertebrae plate. The spiral locking cap and the screw can effectively prevent the screw from loosening or falling. At the same time, the device also takes into account the physiological curvature of the cervical spine and sets a groove for the physiological curvature of the cervical spine, so that the steel plate can better fit the physiological structure of the cervical spine and improve the stability of fixation.

[0004] However, although the device reduces the risk of screw loosening to a certain extent, the spiral locking nut itself is also likely to loosen. Once the spiral locking nut is loose, the fixing effect of the screw will be affected, and there is still a risk of screw loosening. Utility Model Content

[0005] The utility model aims to provide a self-locking steel plate for the anterior cervical spine, which limits the screws by elastic self-locking and prevents the hidden dangers of the screws loosening and falling off.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions: a self-locking steel plate for anterior cervical spine, comprising a butterfly-shaped fixed steel plate, wherein the edge of the upper end of the fixed steel plate is downwardly provided with a plurality of mutually symmetrical limiting holes, each limiting hole is downwardly provided with a mounting hole penetrating the fixed steel plate, the fixed steel plate is provided with a self-locking plate between every two adjacent limiting holes, each self-locking plate is downwardly provided with a movable groove, each movable groove is open toward both ends of the limiting hole, and each movable groove is Both inner walls are provided with limit slots inwardly, and each limit slot is sealed at both ends facing the corresponding limit hole. An elastic locking steel wire is arranged in each movable groove, and each elastic locking steel wire includes a limit steel wire strip extending into one of the limit slots, a self-locking steel wire connected to both ends of the limit steel wire strip and extending above the corresponding limit hole, a limit hook connected to the free end of each self-locking steel wire and bent inwardly to form a limit hook, and an anti-loosening steel wire strip connected to the free end of each limit hook and extending to the other limit slot.

[0007] By adopting the above technical solution, in anterior cervical spine surgery, after the fixed steel plate is placed at the corresponding cervical vertebrae position, first use a tool to pull the limit hook to retract the self-locking wire into the movable groove, use the tool to pass the bone screw through the mounting hole and connect it to the cervical vertebrae, so that the butterfly steel plate is fixed on the cervical vertebrae, and after fixation is completed, release the limit hook to allow the limit protrusion to reset under the elastic action, so that the self-locking wire presses the limit ring of the bone screw under the elastic action to prevent it from loosening.

[0008] The utility model is further configured as follows: two limiting protrusions cooperating with the limiting hooks are arranged at the upper end of each movable groove; after each limiting hook is connected to the corresponding limiting protrusion, the corresponding self-locking steel wire does not extend above the corresponding limiting hole.

[0009] The utility model is further configured as follows: a side of each limiting protrusion facing the corresponding limiting hole is an inclined surface.

[0010] The utility model is further configured as follows: it also includes a bone screw, which includes a screw column matched with the mounting hole, a screw cap connected to the upper end of the screw column, and a limiting ring arranged on the lower end edge of the screw cap and matched with the inner diameter of the limiting hole.

[0011] In summary, the utility model has the following beneficial effects:

[0012] First, the utility model presses the screw by the elastic action of the self-locking wire, so that the screw will not loosen, and the self-locking wire uses the elastic action of the wire to extend above the screw, and will not automatically retract from above the screw when not acted upon by external force, ensuring that the self-locking wire can always press above the screw, eliminating the hidden danger of the screw loosening and falling off;

[0013] Secondly, the utility model adopts the shape design of the elastic locking wire so that the elastic locking wire is elastically clamped in the two limit clamping grooves on the self-locking plate and will not loosen, thereby eliminating the hidden danger of the screw loosening and falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the overall structure of the elastic locking steel wire;

[0016] Figure 3 It is a usage state diagram of the utility model.

[0017] In the figure: 1. fixed steel plate; 11. limiting hole; 12. mounting hole; 2. self-locking plate; 21. movable groove; 22. limiting slot; 23. limiting protrusion; 3. elastic locking wire; 31. limiting steel wire strip; 32. self-locking steel wire; 33. limiting hook; 34. anti-loosening steel wire strip; 4. bone screw; 41. screw column; 42. screw cap; 43. limiting ring. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Example, see Figure 1-3 A self-locking steel plate for anterior cervical vertebrae comprises a butterfly-shaped fixing steel plate 1, and four mutually symmetrical limiting holes 11 are opened downwardly at the edge of the upper end of the fixing steel plate 1, and each limiting hole 11 is opened downwardly with a mounting hole 12 penetrating the fixing steel plate 1, and a self-locking plate 2 is arranged between every two adjacent limiting holes 11 of the fixing steel plate 1, and each self-locking plate 2 is opened downwardly with a movable groove 21, and each movable groove 21 is open toward both ends of the limiting hole 11, and both inner walls of each movable groove 21 are opened inwardly with a limiting card groove 22, and the limiting card groove 22 is sealed toward both ends of the limiting hole 11.

[0021] Each movable groove 21 is provided with an elastic locking steel wire 3, and each elastic locking steel wire 3 includes a limiting steel wire strip 31 extending into one of the limiting card slots 22, two self-locking steel wires 32 respectively connected to both ends of the limiting steel wire strip 31 and extending to the top of the corresponding limiting hole 11, two limiting hooks 33 respectively connected to the free end of each self-locking steel wire 32 and bent inwardly to form, and two limiting hooks 33 respectively connected to the free end of each limiting hook 33 and extending to the other limiting card slot 22. The anti-loosening steel wire strip 34 extends into the two limiting slots 22 respectively through the limiting steel wire strip 31 and the anti-loosening steel wire strip 34, so that the elastic locking steel wire 3 will not fall off. The upper end of each movable slot 21 is provided with two limiting protrusions 23 that cooperate with the limiting hooks 33. Each limiting protrusion 23 has an inclined surface on one side facing the corresponding limiting hole 11. After each limiting hook 33 is connected to the corresponding limiting protrusion 23, the corresponding self-locking steel wire 32 does not extend to the top of the corresponding limiting hole 11.

[0022] It also includes a bone screw 4, which includes a screw column 41 that matches the mounting hole 12, a screw cap 42 connected to the upper end of the screw column 41, and a limiting ring 43 that is arranged on the lower edge of the screw cap 42 and matches the inner diameter of the limiting hole 11. The self-locking steel wire 32 extends into the upper part of the limiting hole 11 and presses the limiting ring 43 to prevent it from loosening.

[0023] Usage: During anterior cervical spine surgery, after placing the fixed steel plate 1 at the corresponding cervical vertebrae position, first use a tool to pull the limiting hook 33 to make it hang on the limiting protrusion 23, so that the self-locking wire 32 retracts into the movable groove 21, and use a tool to pass the bone screw 4 through the mounting hole 12 to connect it to the cervical vertebrae, so that the butterfly steel plate is fixed on the cervical vertebrae. After the fixation is completed, use a tool to pry the limiting hook 33 to loosen it from the limiting protrusion 23, so that the self-locking wire 32 presses the limiting ring 43 of the bone screw 4 under the elastic action to prevent it from loosening.

[0024] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A self-locking steel plate for anterior cervical spine, comprising a butterfly-shaped fixing steel plate (1), wherein the upper edge of the fixing steel plate (1) is provided with a plurality of mutually symmetrical limiting holes (11) downwardly, and each limiting hole (11) is provided with a mounting hole (12) penetrating the fixing steel plate (1) downwardly, characterized in that: The fixed steel plate (1) is provided with a self-locking plate (2) between each two adjacent limiting holes (11), each self-locking plate (2) is provided with a movable groove (21) downwardly, each movable groove (21) is open towards both ends of the limiting hole (11), both inner walls of each movable groove (21) are provided with a limiting card groove (22) inwardly, each limiting card groove (22) is sealed towards both ends of the corresponding limiting hole (11), and each movable groove (21) is provided with an elastic locking steel wire. (3), each elastic locking steel wire (3) comprises a limiting steel wire strip (31) extending into one of the limiting slots (22), a self-locking steel wire (32) connected to both ends of the limiting steel wire strip (31) and extending to the top of the corresponding limiting hole (11), a limiting hook (33) connected to the free end of each self-locking steel wire (32) and bent inward to form an anti-loosening steel wire strip (34) connected to the free end of each limiting hook (33) and extending into another limiting slot (22).

2. The anterior cervical self-locking plate according to claim 1, characterized in that: The upper end of each movable groove (21) is provided with two limiting protrusions (23) matched with the limiting hooks (33). After each limiting hook (33) is connected with the corresponding limiting protrusion (23), the corresponding self-locking steel wire (32) does not extend above the corresponding limiting hole (11).

3. The anterior cervical self-locking steel plate according to claim 2, characterized in that: The side of each limiting protrusion (23) facing the corresponding limiting hole (11) is an inclined surface.

4. The anterior cervical self-locking plate according to claim 1, characterized in that: It also includes a bone screw (4), which includes a screw column (41) that matches the mounting hole (12), a screw cap (42) connected to the upper end of the screw column (41), and a limiting ring (43) arranged on the lower edge of the screw cap (42) and matching the inner diameter of the limiting hole (11).

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