Spine internal fixing device with changeable angle

Abstract

The utility model relates to the technical field of medical instruments, in particular to an angle-changeable spinal internal fixing device which comprises a pedicle screw, a fixed plate and a movable plate. The fixed plate is fixedly connected with the movable plate in an inserted mode. The upper end of the pedicle screw is inserted into the fixed plate and the movable plate, and the upper end of the pedicle screw is fixed through a nut; the end part of the connecting rod is hinged with the incomplete gear; the shell is welded to the end, close to the incomplete gear, of the connecting rod. The locking screw is connected with the shell in a threaded rotation mode, and the lower end of the locking screw abuts against the incomplete gear. By improving the angle-changeable spinal internal fixing device, the angle-changeable spinal internal fixing device has the advantages that the direction of the pedicle screw can be set as required, the pedicle screw is firmly and reliably connected with the connecting rod after being fixed, the angle is not easy to change, and the connecting rod is conveniently connected with the pedicle screw; therefore, the problems and defects in the prior art and equipment are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and more specifically, to an angle-changeable spinal internal fixation device. Background Art

[0002] When accidents or diseases such as spinal fractures, tumor lesions, lumbar spondylolisthesis and scoliosis occur, the spine needs to be corrected, and one of the means is spinal fixation. The development of spinal fixation technology has played a huge role in the treatment of many diseases such as spinal trauma, correction and degeneration, and marks the level of development of spinal surgery.

[0003] In patent CN103800059A, an adjustable transverse connection device for spinal internal fixation is used to fix the pedicle screws by tightening the expansion ring with a compression nut. The connection strength is relatively low, which affects the reliability of use. Moreover, after the pedicle screws are driven in, the pedicle screws have an inclined angle, which is not convenient for the installation of the connecting rod.

[0004] In view of this, research and improvement are conducted on the existing problems, and a spinal internal fixation device with adjustable angle is provided, aiming to solve the problems and improve the practical value through this technology. Utility Model Content

[0005] The purpose of the utility model is to provide a spinal internal fixation device with adjustable angles to solve the problems and shortcomings of the above-mentioned background technology.

[0006] To achieve the above purpose, the utility model provides a spinal internal fixation device with adjustable angle, which is achieved by the following specific technical means:

[0007] A spinal internal fixation device with adjustable angle, comprising: a cone arch root screw, a fixing plate, a movable plate, a nut, a fixing column, an incomplete gear, a connecting rod, a shell, a locking screw, a bidirectional screw, and an adjusting nut; the fixing plate is plugged and fixedly connected with the movable plate; the upper end of the cone arch root screw is plugged into the fixing plate and the movable plate, and the upper end of the cone arch root screw is fixed by a nut; one end of the fixing column is welded and fixed to the outer wall of the fixing plate, and the incomplete gear is welded and fixed to the other end of the fixing column; the end of the connecting rod is hingedly connected to the incomplete gear; the shell is welded to one end of the connecting rod close to the incomplete gear; the locking screw is connected to the shell by a threaded rotation method, and the lower end of the locking screw abuts against the incomplete gear; the two ends of the bidirectional screw are connected to the connecting rod by a threaded rotation method; the adjusting nut is fixedly set in the middle position of the bidirectional screw.

[0008] As a further optimization of the technical solution, in a spinal internal fixation device with an adjustable angle of the present utility model, the fixing plate is a plate-shaped structure with a semicircular arc cross-section, and two dovetail-shaped protrusions are provided on the side surface of the fixing plate opposite to the movable plate.

[0009] As a further optimization of the technical solution, in a spinal internal fixation device with an adjustable angle of the present utility model, the movable plate is a plate-shaped structure with a semicircular arc cross-section, and two dovetail grooves for connecting with the fixing plate are provided on the movable plate.

[0010] As a further optimization of the technical solution, in a spinal internal fixation device with an adjustable angle of the present utility model, the connecting rod is a rectangular strip-shaped structure, a through groove for accommodating an incomplete gear is provided at one end of the connecting rod, and a threaded hole for connecting a bidirectional screw is provided at the other end of the connecting rod.

[0011] As a further optimization of the technical solution, in a spinal internal fixation device with an adjustable angle of the present utility model, the housing is a plate-shaped structure in the shape of the Chinese character "冂".

[0012] As a further optimization of the technical solution, in a spinal internal fixation device with an adjustable angle of the present utility model, the bidirectional screw is a screw with opposite threads at both ends.

[0013] As a further optimization of the technical solution, in a spinal internal fixation device with an adjustable angle of the present utility model, the lower end of the locking screw is a conical structure.

[0014] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0015] 1. The fixing plate of the present utility model is a plate-shaped structure with a semicircular arc cross-section, and two dovetail-shaped protrusions are provided on the side surface of the fixing plate opposite to the movable plate. The movable plate is a plate-shaped structure with a semicircular arc cross-section, and two dovetail grooves for connecting with the fixing plate are provided on the movable plate. The separate setting of the fixing plate and the movable plate facilitates the fixed connection between the connecting rod and the pedicle screw, and the operation is simple.

[0016] 2. The end of the connecting rod of the present utility model is hinged to the incomplete gear, the locking screw is connected to the housing by means of threaded rotation, and the lower end of the locking screw abuts against the incomplete gear. By rotating the incomplete gear, the inclination angle of the fixing plate is changed to adapt to pedicle screws with different slopes, and the locking screw firmly fixes the incomplete gear, preventing the pedicle screw from rotating relative to the connecting rod.

[0017] 3. The utility model improves the spinal internal fixation device with adjustable angles, and has the advantages that the direction of the pedicle screw can be set as needed, and after fixation, the connection between the pedicle screw and the connecting rod is firm and reliable, the angle is not easy to change, and the connection between the connecting rod and the pedicle screw is convenient, thereby effectively solving the problems and shortcomings in the existing technology and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a partial cross-sectional structural schematic diagram of the utility model;

[0021] Figure 3 It is a schematic diagram of the exploded structure of the utility model.

[0022] In the figure: a pedicle screw 1, a fixing plate 2, a movable plate 3, a nut 4, a fixing column 5, an incomplete gear 6, a connecting rod 7, a housing 8, a locking screw 9, a bidirectional screw 10, and an adjusting nut 11. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely 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, rather than all of the embodiments.

[0024] See also Figures 1 to 3 The utility model provides a specific technical implementation scheme of a spinal internal fixation device with adjustable angle:

[0025] A spinal internal fixation device with adjustable angles comprises: a pedicle screw 1, a fixing plate 2, a movable plate 3, a nut 4, a fixing column 5, an incomplete gear 6, a connecting rod 7, a housing 8, a locking screw 9, a bidirectional screw 10, and an adjusting nut 11; the fixing plate 2 is a plate-like structure with a semicircular arc cross section, and two dovetail-shaped protrusions are provided on the sides opposite to the fixing plate 2 and the movable plate 3; the movable plate 3 is a plate-like structure with a semicircular arc cross section, and two dovetail grooves connected to the fixing plate 2 are provided on the movable plate 3; the movable plate 3 is arranged separately from the fixing plate 2, which facilitates the fixed connection between the connecting rod 7 and the pedicle screw 1 and is easy to operate; the fixing plate 2 and the movable plate 3 are plugged and fixedly connected; the upper end of the pedicle screw 1 is plugged into the fixing plate 2 and the movable plate 3, and the upper end of the pedicle screw 1 is fixed by the nut 4.

[0026] One end of the fixed column 5 is fixedly welded to the outer wall of the fixed plate 2, and the incomplete gear 6 is fixedly welded to the other end of the fixed column 5; the connecting rod 7 is a rectangular strip structure, and a through groove for accommodating the incomplete gear 6 is opened at one end of the connecting rod 7, and a threaded hole for connecting the bidirectional screw 10 is opened at the other end of the connecting rod 7; the end of the connecting rod 7 is hingedly connected to the incomplete gear 6; by rotating the incomplete gear 6, the inclination angles of the fixed plate 2 and the pedicle screw 1 are made the same; the housing 8 is welded to one end of the connecting rod 7 close to the incomplete gear 6; the housing 8 is a plate-shaped structure in the shape of the Chinese character "冂"; the lower end of the locking screw 9 is a conical structure; the locking screw 9 is connected to the housing 8 by means of threaded rotation, and the lower end of the locking screw 9 abuts against the incomplete gear 6; the locking screw 9 firmly fixes the incomplete gear 6 to prevent the pedicle screw 1 from rotating relative to the connecting rod 7; both ends of the bidirectional screw 10 are connected to the connecting rod 7 by means of threaded rotation; the bidirectional screw 10 is a screw with opposite threads at both ends; the adjusting nut 11 is fixedly arranged at the middle position of the bidirectional screw 10.

[0027] Specific implementation steps:

[0028] During use, the pedicle screw 1 is driven into the vertebral body of the spine at the required angle. After two pedicle screws 1 are driven in, the fixed plate 2 and the movable plate 3 are inserted and fixed together, sleeved on the upper end of one of the pedicle screws 1, and fixed by the nut 4. The adjusting nut 11 is screwed, the incomplete gear 6 is rotated, so that the surface of the fixed plate 2 fits against the end of the other pedicle screw 1. The movable plate 3 is inserted into the fixed plate 2 and fixed by the nut 4. The locking screw 9 is screwed into the housing 8 to fix the incomplete gear 6, and the installation of the fixing device is completed.

[0029] In summary: For this spine internal fixation device with adjustable angle, the fixed plate is a plate-shaped structure with a semi-circular arc cross-section, and there are two dovetail-shaped protrusions on the side of the fixed plate opposite to the movable plate. The movable plate is a plate-shaped structure with a semi-circular arc cross-section, and there are two dovetail grooves connected to the fixed plate on the movable plate. The separate setting of the fixed plate and the movable plate facilitates the fixed connection between the connecting rod and the pedicle screw, and the operation is simple; through the hinged connection between the end of the connecting rod and the incomplete gear, the locking screw is connected to the housing by means of threaded rotation, and the lower end of the locking screw abuts against the incomplete gear. By rotating the incomplete gear, the inclination angle of the fixed plate is changed to suit pedicle screws with different slopes, and the locking screw firmly fixes the incomplete gear, preventing the pedicle screw from rotating relative to the connecting rod; through the improvement of the spine internal fixation device with adjustable angle, the present invention has the advantages that the direction of the pedicle screw can be set according to needs, and the connection between the pedicle screw and the connecting rod is firm and reliable after fixation, the angle is not easy to change, and the connection between the connecting rod and the pedicle screw is convenient, thus effectively solving the problems and deficiencies in the prior art and equipment.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spinal internal fixation device with adjustable angle, comprising: Pedicle screw (1), fixing plate (2), movable plate (3), nut (4), fixing column (5), incomplete gear (6), connecting rod (7), housing (8), locking screw (9), bidirectional screw (10), adjusting nut (11); characterized in that: the fixing plate (2) is fixedly connected to the movable plate (3) by insertion; the upper end of the pedicle screw (1) is inserted into the fixing plate (2) and the movable plate (3), and the upper end of the pedicle screw (1) is fixed by the nut (4); one end of the fixing column (5) is fixedly welded to the outer wall of the fixing plate (2), and the incomplete gear (6) is fixedly welded to the other end of the fixing column (5); the end of the connecting rod (7) is hinged to the incomplete gear (6); the housing (8) is welded to one end of the connecting rod (7) close to the incomplete gear (6); the locking screw (9) is connected to the housing (8) by means of threaded rotation, and the lower end of the locking screw (9) abuts against the incomplete gear (6); both ends of the bidirectional screw (10) are connected to the connecting rod (7) by means of threaded rotation; the adjusting nut (11) is fixedly arranged at the middle position of the bidirectional screw (10).

2. The angle-adjustable spinal internal fixation device according to claim 1, characterized in that: The fixing plate (2) is a plate-like structure with a semi-circular cross-section, and two dovetail-shaped protrusions are provided on the side surface of the fixing plate (2) opposite to the movable plate (3).

3. The angle-adjustable spinal internal fixation device according to claim 1, characterized in that: The movable plate (3) is a plate-like structure with a semi-circular cross-section, and two dovetail grooves for connecting with the fixing plate (2) are provided on the movable plate (3).

4. The angle-adjustable spinal internal fixation device according to claim 1, characterized in that: The connecting rod (7) is a rectangular strip structure, and a through groove for accommodating the incomplete gear (6) is provided at one end of the connecting rod (7), and a threaded hole for connecting the bidirectional screw (10) is provided at the other end of the connecting rod (7).

5. The angle-adjustable spinal internal fixation device according to claim 1, characterized in that: The housing (8) is a plate-like structure in the shape of the Chinese character "冂".

6. The spinal internal fixation device with adjustable angle according to claim 1, characterized in that: The bidirectional screw (10) is a screw with opposite threads at both ends.

7. The spinal internal fixation device with adjustable angle according to claim 1, characterized in that: The lower end of the locking screw (9) is a conical structure.

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