Anterior cervical anti-loose locking device

Abstract

The utility model discloses an anterior cervical anti-loosing locking device, which relates to the technical field of orthopedic surgery and comprises an anterior cervical steel plate and screws for connecting the anterior cervical steel plate with the cervical vertebra, stepped holes are formed in four corners of the anterior cervical steel plate in a penetrating manner and comprise counter bores and through holes, and the tails of the screws penetrate through the through holes to be connected with the cervical vertebra. The heads of the screws are located in the counter bores, cross star grooves are formed in the heads of the screws, two locking grooves are symmetrically formed in the anterior cervical steel plate, the two screws on the same side correspond to the locking grooves, locking holes communicated with the locking grooves are formed in the side walls of the counter bores, locking plates are arranged in the locking grooves in a sliding mode, and two locking teeth are fixed to the locking plates. The two lock teeth correspond to the two screws respectively, the lock teeth penetrate through the lock holes to be inserted into the cross-shaped star groove, the anti-loosening effect of the screws is achieved by limiting rotation of the screws, and the connection tightness between the screws and the cervical vertebra is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to orthopedic surgery technical field, concretely is a kind of cervical vertebra front road anti-loose locking device. BACKGROUND

[0002] At present, in the surgical treatment of cervical spondylolisthesis, cervical intervertebral disc degenerative lesions, tumor, trauma, cervical vertebra front road locking steel plate is needed to be used to internal fixation recovery, and for cervical vertebra front road locking steel plate to meet low incision, prevent locking, width narrow, less compression blood vessels and other composite internal fixation treatment principle. The current cervical vertebra front road plate will screw into cervical vertebra, with the movement of human body, screw will constantly produce compression to surrounding cervical vertebra, after long-term work, the connection between screw and cervical vertebra becomes loose, at this time, it will be easy to fall off. CONTENT OF UTILITY MODEL

[0003] The utility model aims at overcoming the insufficient of prior art, provide a kind of cervical vertebra front road anti-loose locking device, prevent screw loose and fall off, enhance the connection tightness between screw and cervical vertebra.

[0004] The utility model aims at overcoming the insufficient of prior art, provide a kind of cervical vertebra front road anti-loose locking device, prevent screw loose and fall off, enhance the connection tightness between screw and cervical vertebra.

[0005] Further, the lock slot is provided with a lock rod, the lock rod is slidably arranged in the cervical vertebra front road plate, the lock rod has the freedom of movement along the axial direction of the stepped hole, and the end face of the lock plate close to the lock rod is provided with a limiting slot.

[0006] Further, the bottom wall of the lock slot is provided with a mounting slot, the mounting slot is provided with a spring, one end of the lock rod is slidably fitted in the mounting slot, and the two ends of the spring are connected with the lock rod and the cervical vertebra front road plate respectively.

[0007] Further, the bottom surface of the lock plate close to one end of the screw is provided with a wedge surface, and the wedge surface is located above the lock rod.

[0008] Further, the lock plate is fixed with sliding blocks on both sides, and the side wall of the lock slot is provided with a sliding groove along the moving direction of the lock plate.

[0009] The utility model discloses the beneficial effect is:

[0010] After the screw is screwed into the cervical vertebra, the lock plate is moved, and the lock tooth of the lock plate is clamped in the cross star groove of the screw, thereby limiting the rotation of the screw, achieving the effect of screw anti-loosening, and enhancing the connection tightness between the screw and the cervical vertebra. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the structure schematic view of a cervical vertebra front road anti-loosening locking device of the utility model;

[0012] Figure 2 It is the structure schematic view of a cervical vertebra front road steel plate in a cervical vertebra front road anti-loosening locking device of the utility model;

[0013] Figure 3 It is Figure 1 It is the section view of A-A direction;

[0014] In the drawing, 1 is a cervical vertebra front road steel plate, 2 is a screw, 3 is a counterbore, 4 is a through hole, 5 is a cross star groove, 6 is a lock slot, 7 is a lock hole, 8 is a lock plate, 9 is a lock tooth, 10 is a lock rod, 11 is a limiting slot, 12 is an installation slot, 13 is a spring, 14 is a wedge surface, and 15 is a sliding groove. DETAILED DESCRIPTION

[0015] For example, Figures 1 to 3As shown, a cervical vertebra anterior path anti-loose locking device, including a cervical vertebra anterior path steel plate 1, a screw 2 for connecting the cervical vertebra anterior path steel plate 1 to the cervical vertebra, a stepped hole is provided in the four corners of the cervical vertebra anterior path steel plate 1, the stepped hole includes a counterbore 3 and a through hole 4, the tail of the screw 2 passes through the through hole 4 to connect the cervical vertebra, the head of the screw 2 is located in the counterbore 3, the head of the screw 2 is provided with a cross star groove 5, two lock grooves 6 are symmetrically provided on the cervical vertebra anterior path steel plate 1, the two screws 2 on the same side correspond to one lock groove 6, the side wall of the counterbore 3 is provided with a lock hole 7 communicating with the lock groove 6, a lock plate 8 is slidably arranged in the lock groove 6, the lock plate 8 is fixed with two lock teeth 9, the two lock teeth 9 correspond to the two screws 2 respectively, the lock tooth 9 is inserted into the cross star groove 5 through the lock hole 7, the cervical vertebra anterior path steel plate 1 is locked at the cervical spondylosis position by the screw 2, after the screw 2 is screwed into the cervical vertebra, the lock plate 8 is moved, the lock tooth 9 of the lock plate 8 is clamped in the cross star groove 5 of the screw 2, the cross star groove 5 is provided from the side of the screw 2, so that the lock tooth 9 can be smoothly clamped into the cross star groove 5 from the side wall of the screw 2, thereby limiting the rotation of the screw 2, achieving the effect of anti-loose of the screw 2, and enhancing the connection tightness between the screw 2 and the cervical vertebra; the cross star groove 5 of the screw 2 is used for screwdriver to drive its rotation, completing installation and disassembly, the anti-loose design of the screw 2 is completed by using the structure of the cross star groove 5, without changing the structure of the screw 2, so that the screw 2 still has universality.

[0016] Further, the two sides of the lock plate 8 are fixed with sliding blocks, the side wall of the lock groove 6 is provided with a sliding groove 15 along the moving direction of the lock plate 8, the sliding blocks are slidably fitted in the sliding groove 15, through the cooperation of the lock block and the lock groove 6, on one hand, the movement of the lock plate 8 is guided, on the other hand, the lock plate 8 cannot be separated from the cervical vertebra anterior path steel plate 1.

[0017] Further, as Figure 1 and Figure 3As shown, the lock slot 6 is provided with a lock rod 10, the lock rod 10 slides through the cervical spine anterior plate 1, the lock rod 10 has the freedom of axial movement along the stepped hole, the end face of the lock plate 8 close to the lock rod 10 is provided with a limiting slot 11, when the lock teeth 9 is inserted into the cross star slot 5, the lock rod 10 is fitted in the limiting slot 11, the bottom wall of the lock slot 6 is provided with a mounting slot 12, the mounting slot 12 is provided with a spring 13, one end of the lock rod 10 is slidably fitted in the mounting slot 12, the both ends of the spring 13 are connected with the lock rod 10 and the cervical spine anterior plate 1, when the spring 13 is in normal state, the other end of the lock rod 10 is fitted in the limiting slot 11, the bottom surface of the lock plate 8 close to one end of the screw 2 is provided with a wedge surface 14, the wedge surface 14 is above the lock rod 10, after the screw 2 is screwed into the cervical spine, the lock plate 8 is moved close to the screw 2, the wedge surface 14 of the lock plate 8 is first contacted with the lock rod 10, under the action of the inclined surface of the wedge surface 14, the lock plate 8 is extruded to move the lock rod 10, the lock rod 10 compresses the spring 13 to move into the mounting slot 12, so that the lock plate 8 can smoothly pass through the lock rod 10, the lock rod 10 is abutted on the bottom of the lock plate 8 under the reaction force of the spring 13, when the lock teeth 9 of the lock plate 8 is inserted into the cross star slot 5, the limiting slot 11 is located on the movement path of the lock rod 10, at this time, the lock rod 10 is inserted into the limiting slot 11 under the reaction force of the spring 13, so as to lock the lock plate 8, so that the lock teeth 9 can be stably inserted into the cross star slot 5 to limit the rotation of the screw 2; when the cervical spine anterior plate 1 is disassembled, because the limiting slot 11 is provided through, a rod which can be inserted into the limiting slot 11 is used to move the lock plate 8, the rod is inserted into the limiting slot 11 to push the lock rod 10 to move into the mounting slot 12, after losing the limiting of the lock rod 10, the rod can drive the lock plate 8 to move away from the screw 2, so that the lock teeth 9 is separated from the cross star slot 5, the smooth disassembly of the cervical spine anterior plate 1 is completed.

Claims

1. A cervical vertebra anterior anti-loosening locking device, comprising a cervical vertebra anterior steel plate (1) and screws (2) for connecting the cervical vertebra anterior steel plate (1) to the cervical vertebra, characterized in that: The four corners of the anterior cervical vertebra steel plate (1) are penetrated by stepped holes, the stepped holes include countersunk holes (3) and through holes (4), the tail of the screw (2) passes through the through holes (4) to connect to the cervical vertebra, the head of the screw (2) is located in the countersunk hole (3), the head of the screw (2) is provided with a cross star slot (5), two locking slots (6) are symmetrically provided on the anterior cervical vertebra steel plate (1), the two screws (2) on the same side each correspond to one locking slot (6), the side wall of the countersunk hole (3) is provided with a locking hole (7) connected to the locking slot (6), a locking plate (8) is slidably provided in the locking slot (6), two locking teeth (9) are fixed on the locking plate (8), the two locking teeth (9) respectively correspond to the two screws (2), and the locking teeth (9) pass through the locking hole (7) and are inserted into the cross star slot (5).

2. The anterior cervical anti-loosening locking device according to claim 1, characterized in that: A locking rod (10) is provided in the locking groove (6), and the locking rod (10) is slidably penetrated in the anterior cervical vertebra steel plate (1). The locking rod (10) has the freedom to move axially along the stepped hole. A limiting groove (11) is provided through the end surface of the locking plate (8) close to the locking rod (10). When the locking tooth (9) is inserted into the cross star groove (5), the locking rod (10) is adapted to be in the limiting groove (11).

3. The anterior cervical anti-loosening locking device according to claim 2, characterized in that: The bottom wall of the locking slot (6) is provided with a mounting slot (12), a spring (13) is provided in the mounting slot (12), one end of the locking rod (10) is slidably adapted in the mounting slot (12), and the two ends of the spring (13) are respectively connected to the locking rod (10) and the anterior cervical vertebrae steel plate (1), and when the spring (13) is in a normal state, the other end of the locking rod (10) is adapted in the limiting slot (11).

4. The anterior cervical vertebra anti-loosening locking device according to claim 3, characterized in that: A wedge-shaped surface (14) is provided on the bottom surface of the locking plate (8) close to one end of the screw (2), and the wedge-shaped surface (14) is located above the locking rod (10).

5. The anterior cervical anti-loosening locking device according to claim 1, characterized in that: Slide blocks are fixed on both sides of the lock plate (8), and a slide block (15) is provided on the side wall of the lock slot (6) along the moving direction of the lock plate (8), and the slide block is slidably fitted in the slide block (15).

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