Spinal fixation nail plate system

Abstract

The utility model discloses a spinal fixation nail plate system. The spine fixing nail plate system comprises a first plate body and a second plate body, wherein the first plate body is provided with a first bending groove extending in the width direction of the first plate body; the first mounting screw and the second mounting screw are arranged on the first plate body in a spaced mode in the length direction of the first plate body, and both the first mounting screw and the second mounting screw can be connected with the vertebral body; the first anti-back screw is arranged on the first plate body or the first mounting screw and can be connected with the vertebral body, and a first preset included angle is formed between the first anti-back screw and the first mounting screw; and the second anti-back screw is arranged on the first plate body or the second mounting screw and can be connected with the vertebral body, and a second preset included angle is formed between the second anti-back screw and the second mounting screw. The spine fixing nail plate system has the advantages of being high in applicability, wide in application range, stable in installation, simple in structure, low in manufacturing cost and manufacturing difficulty, low in incisura and the like.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a spinal fixation plate system. Background Technology

[0002] With the development of science and technology, the accelerated pace of life and work, and the increasingly serious problem of population aging, spinal diseases of the cervical and thoracic-lumbar spine are showing an upward trend year by year. Cervical fractures and thoracic-lumbar spine fractures are the most common types of spinal injuries. Spinal fixation plate systems are widely used in cervical, thoracic, and lumbar spine surgeries, and these systems are fixed to the vertebral bodies with screws. However, with postoperative activity and movement, the screws in the spinal fixation plate system are prone to loosening or even falling out, leading to loosening or displacement of the fixation plate and causing damage near the incision site. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of this invention propose a spinal fixation plate system.

[0004] The spinal fixation plate system of this utility model includes: a first plate, the first plate having a first bending groove extending along the width direction of the first plate; a first mounting screw and a second mounting screw, the first mounting screw and the second mounting screw being disposed at a distance from each other along the length direction of the first plate, both the first mounting screw and the second mounting screw being capable of connecting to a vertebral body; a first anti-retraction screw, the first anti-retraction screw being disposed on one of the first plate and the first mounting screw and being capable of connecting to the vertebral body, the first anti-retraction screw and the first mounting screw forming a first preset angle; and a second anti-retraction screw, the second anti-retraction screw being disposed on one of the first plate and the second mounting screw and being capable of connecting to the vertebral body, the second anti-retraction screw and the second mounting screw forming a second preset angle.

[0005] The first plate of this spinal fixation plate system is provided with a first bending groove, which facilitates bending of the left and right first plates during surgery, making the inner side of the first plate more conform to the shape of the surrounding vertebral body. It has strong applicability and a wide range of applications. At the same time, through the cooperation of anti-retraction screws and installation screws, it can ensure that the installation screws will not retract or loosen after being driven into the vertebral body, ensuring a stable installation. In addition, compared with the existing technology that uses locking structures and other structures to cooperate with the installation screws to achieve anti-retraction, this spinal fixation plate system simplifies the structure of the first plate, improves the production and processing efficiency of the first plate, reduces manufacturing costs and manufacturing difficulty, and has the advantage of low notch, reducing irritation to the soft tissues and muscles near the plate, alleviating pain for patients and reducing surgical risks.

[0006] Optionally, the first bending groove is provided in multiples and is spaced apart along the length direction of the first plate; and / or, the first bending groove is an arc-shaped groove or a V-shaped groove; and / or, the multiple first bending grooves are all located between the first mounting screw and the second mounting screw in the length direction of the first plate, and the multiple first bending grooves are located between the first anti-reverse screw and the second anti-reverse screw in the length direction of the first plate; and / or, it further includes a second plate, the second plate being cross-connected to the first plate; and / or, the first plate is provided with an observation window; and / or, the first plate is arc-shaped; and / or, the first preset included angle is greater than 10 degrees and less than or equal to 19 degrees; and / or, the second preset included angle is greater than 10 degrees and less than or equal to 19 degrees.

[0007] Optionally, the second plate is provided with a second bending groove extending along the width direction of the second plate; and / or, the second plate and the first plate are integrally formed; and / or, the second plate is arc-shaped; and / or, a step groove is provided in the observation window.

[0008] Optionally, the first anti-reverse screw includes a first threaded portion, wherein the rake angle of the first threaded portion is greater than or equal to 20 degrees and less than or equal to 50 degrees, and / or the clearance angle of the first threaded portion is greater than or equal to 3 degrees and less than or equal to 10 degrees; and / or, the second anti-reverse screw includes a second threaded portion, wherein the rake angle of the second threaded portion is greater than or equal to 20 degrees and less than or equal to 50 degrees, and / or the clearance angle of the second threaded portion is greater than or equal to 3 degrees and less than or equal to 10 degrees.

[0009] Optionally, the rake angle of the first threaded portion is greater than or equal to 24 degrees and less than or equal to 36 degrees or greater than or equal to 44 degrees and less than or equal to 46 degrees; and / or, the rake angle of the second threaded portion is greater than or equal to 24 degrees and less than or equal to 36 degrees or greater than or equal to 44 degrees and less than or equal to 46 degrees; and / or, the clearance angle of the first threaded portion is greater than or equal to 4 degrees and less than or equal to 6 degrees or greater than or equal to 8 degrees and less than or equal to 10 degrees; and / or, the clearance angle of the second threaded portion is greater than or equal to 4 degrees and less than or equal to 6 degrees or greater than or equal to 8 degrees and less than or equal to 10 degrees.

[0010] Optionally, the first anti-reverse screw includes a first shank and a first threaded portion, the first threaded portion being disposed on the first shank, the first threaded portion having a first surface and a second surface opposite to each other in the length direction of the first shank, the first surface including a first arcuate portion connected to the first shank, and the second surface including a second arcuate portion connected to the first shank; and / or, the second anti-reverse screw includes a second shank and a second threaded portion, the second threaded portion being disposed on the second shank, the second threaded portion having a third surface and a fourth surface opposite to each other in the length direction of the second shank, the third surface including a third arcuate portion connected to the second shank, and the fourth surface including a fourth arcuate portion connected to the second shank.

[0011] Optionally, the radius of the first arc portion is greater than or equal to 0.6 mm and less than or equal to 1.5 mm; and / or, the radius of the second arc portion is greater than or equal to 0.3 mm and less than or equal to 1 mm; and / or, the radius of the third arc portion is greater than or equal to 0.6 mm and less than or equal to 1.5 mm; and / or, the radius of the fourth arc portion is greater than or equal to 0.3 mm and less than or equal to 1 mm; and / or, the profile of the first threaded portion is a shuttle-shaped structure, the first threaded portion includes a first tapered segment near the tip of the first anti-return screw, a first straight segment in the middle, and a second tapered segment away from the tip of the first anti-return screw, the first tapered segment and the second tapered segment both gradually widening from the tip away from the tip; and / or, the profile of the second threaded portion is a shuttle-shaped structure, the second threaded portion includes a third tapered segment near the tip of the second anti-return screw, a second straight segment in the middle, and a fourth tapered segment away from the tip of the second anti-return screw, the third tapered segment and the fourth tapered segment both gradually widening from the tip away from the tip.

[0012] Optionally, the radius of the first arc portion is greater than or equal to 0.8 mm and less than or equal to 1.2 mm; or the radius of the second arc portion is greater than or equal to 0.5 mm and less than or equal to 0.8 mm; or the radius of the third arc portion is greater than or equal to 0.8 mm and less than or equal to 1.2 mm; or the radius of the fourth arc portion is greater than or equal to 0.5 mm and less than or equal to 0.8 mm.

[0013] Optionally, the first plate body is provided with a first mounting hole, the first mounting hole including a first ball-and-socket section, a first cylindrical section and a first expansion section arranged sequentially along the thickness direction of the first plate body, the first mounting screw including a first ball head, a first arc transition portion and a third shank portion connected in sequence, the cross-sectional area of ​​the first arc transition portion decreasing along the direction from the first ball head to the third shank portion, wherein the first ball head is rotatably fitted in the first ball-and-socket section, the diameter of the first cylindrical section is greater than the maximum diameter of the first arc transition portion, and the diameter of the first cylindrical section is smaller than the diameter of the first ball head; and / or, the first plate body is provided with a second mounting hole, the second mounting hole including a second ball-and-socket section, a second cylindrical section and a second expansion section arranged sequentially along the thickness direction of the first plate body, the second mounting screw including a second ball head, a second arc transition portion and a fourth shank portion connected in sequence, the cross-sectional area of ​​the second arc transition portion decreasing along the direction from the second ball head to the fourth shank portion, wherein the second ball head is rotatably fitted in the second ball-and-socket section, and the diameter of the second cylindrical section is greater than the maximum diameter of the first arc transition portion and the diameter of the first ball head is smaller than the maximum diameter of the first arc transition portion and the diameter of the first cylindrical section is smaller than the maximum diameter of the first ball head; and / or, the first plate body is provided with a second mounting hole, the second mounting hole including a second ball head, a second arc transition portion and a fourth shank portion arranged in sequence along the thickness direction of the first plate body, the second mounting hole including a second ball head, a second arc transition portion and a fourth shank portion, the cross-sectional area of ​​the second arc transition portion decreasing along the direction from the second ball head to the fourth shank portion, wherein the second ball head is rotatably fitted in the second ball-and-socket section, and the diameter of the second cylindrical section is larger than the maximum diameter of the first arc transition portion and the diameter of the first ball head is smaller than The maximum diameter of the two arc transition portions, the diameter of the second cylindrical segment is smaller than the diameter of the second spherical head; and / or, the first mounting screw is provided with a first mounting groove, the first part of the first anti-return screw is fitted in the first mounting groove, wherein the wall surface of the first mounting groove is provided with one of a first protrusion and a first groove, the first part of the first anti-return screw is provided with the other of the first protrusion and the first groove, and the first protrusion engages in the first groove; and / or, the second mounting screw is provided with a second mounting groove, the first part of the second anti-return screw is fitted in the second mounting groove, wherein the wall surface of the second mounting groove is provided with one of a second protrusion and a second groove, the first part of the second anti-return screw is provided with the other of the second protrusion and the second groove, and the second protrusion engages in the second groove; and / or, the end of the first mounting screw is provided with a drive groove; and / or, the side of the end of the first mounting screw shaft is provided with a self-tapping groove; and / or, the end of the second mounting screw is provided with a drive groove; and / or, the side of the end of the second mounting screw shaft is provided with a self-tapping groove.

[0014] Optionally, the first anti-return screw is a self-tapping screw, with a self-tapping dowel at the end of the shank; or, the first anti-return screw is a self-drilling screw, with a self-drilling tip at the end of the shank; and / or, the first anti-return screw has a self-tapping groove on the side of the shank end away from its first portion; and / or, the first anti-return screw has a drive groove at the end of its first portion; and / or, the second anti-return screw is a self-tapping screw, with a self-tapping dowel at the end of the shank; or, the second anti-return screw is a self-drilling screw, with a self-drilling tip at the end of the shank; and / or, the second anti-return screw has a self-tapping groove on the side of the shank end away from its first portion; and / or, the second anti-return screw has a drive groove at the end of its first portion. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a spinal fixation plate system according to an embodiment of the present invention;

[0016] Figure 2 This is a partial structural schematic diagram of a spinal fixation plate system according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the use of a spinal fixation plate system according to an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of a spinal fixation plate system according to another embodiment of the present invention;

[0019] Figure 5 This is a partial structural schematic diagram of a spinal fixation plate system according to another embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of the use of a spinal fixation plate system according to another embodiment of the present invention;

[0021] Figure 7 This is a cross-sectional view of the spinal fixation plate system according to an embodiment of the present invention;

[0022] Figure 8 This is a partial structural schematic diagram of the spinal fixation plate system according to an embodiment of the present utility model;

[0023] Figure 9 This is a structural schematic diagram of the first mounting screw (second mounting screw) of the spinal fixation plate system according to an embodiment of the present utility model;

[0024] Figure 10This is a cross-sectional view of the first mounting screw (second mounting screw) of the spinal fixation plate system according to an embodiment of the present invention;

[0025] Figure 11 This is a structural schematic diagram of the first anti-removal screw (second anti-removal screw) of the spinal fixation plate system according to an embodiment of the present utility model;

[0026] Figure 12 This is a partial sectional view of the first anti-removal screw (second anti-removal screw) of the spinal fixation plate system according to an embodiment of the present invention. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The spinal fixation plate system 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings. Figures 1-12 As shown, the spinal fixation plate system 100 according to an embodiment of the present invention includes a first plate 1, a first mounting screw 5, a second mounting screw 6, a first anti-retraction screw 7, and a second anti-retraction screw 8.

[0029] The first plate 1 is provided with a first bending groove 11, which extends along the width direction of the first plate 1. A first mounting screw 5 and a second mounting screw 6 are provided on the first plate 1 at intervals along the length direction of the first plate 1. Both the first mounting screw 5 and the second mounting screw 6 can be connected to the cone.

[0030] The first anti-retraction screw 7 is disposed on one of the first plate 1 and the first mounting screw 5, and the first anti-retraction screw 7 and the first mounting screw 5 form a first preset angle. The second anti-retraction screw 8 is disposed on one of the first plate 1 and the second mounting screw 6, and the second anti-retraction screw 8 and the second mounting screw 6 form a second preset angle. Both the first anti-retraction screw 7 and the second anti-retraction screw 8 can be connected to the vertebral body.

[0031] The spinal fixation plate system 100 according to an embodiment of the present invention provides a first bending groove 11 extending along its width on a first plate 1, thereby facilitating and easily bending the first plate 1 in the vertical direction so that the first plate 1 can better conform to the upper and lower vertebrae of different sizes. This effectively enhances the applicability and expands the scope of application of the spinal fixation plate system 100, enabling it to be used for patients of different heights, weights, and ages.

[0032] According to an embodiment of the present invention, the spinal fixation plate system 100 is provided with a first mounting screw 5 and a first anti-removal screw 7 at a first preset angle, and a second mounting screw 6 and a second anti-removal screw 8 at a second preset angle. This allows the first mounting screw 5 and the first anti-removal screw 7 to be cross-fixed to the vertebral body, and the second mounting screw 6 and the second anti-removal screw 8 to be cross-fixed to the vertebral body, effectively preventing the first mounting screw 5, the first anti-removal screw 7, the second mounting screw 6 and the second anti-removal screw 8 from loosening, removing, or even falling off.

[0033] This allows the spinal fixation plate system 100 to be more securely fixed to the vertebral body, effectively preventing loosening or displacement, and thus effectively avoiding damage near the patient's incision. Furthermore, it eliminates the need for locking mechanisms and locking screws, simplifying the structure of the spinal fixation plate system 100, reducing manufacturing costs and complexity, and improving manufacturing efficiency. In addition, the elimination of locking screws reduces the notch area of ​​the spinal fixation plate system 100, thereby minimizing stimulation to surrounding soft tissues and muscles, alleviating patient pain, and lowering surgical risks.

[0034] Therefore, the spinal fixation plate system 100 according to the present utility model has the advantages of strong applicability, wide application range, stable installation, simple structure, low manufacturing cost and manufacturing difficulty, and low notch depth.

[0035] In this embodiment, the first plate 1 can be used in conjunction with the fusion device 200. For example, when performing thoracolumbar fusion, it is often necessary to first remove the intervertebral disc to create a space that can be implanted into the fusion device 200. Usually, the removed intervertebral disc is cut into pieces and filled into the fusion device 200. Then, the fusion device 200 is implanted into the remaining space. The surrounding gaps of the fusion device 200 are also filled with bone fragments or bone graft material as much as possible.

[0036] like Figures 1-12 As shown, the first plate 1 has an observation window 15 at its midpoint along its length to allow observation of the implantation of the fusion device 200 and to perform procedures such as supplementary bone grafting around the fusion device 200. The observation window 15 has a stepped groove 151, which is used to fix the first plate 1 (spinal fixation plate system 100) and the fusion device 200 externally to form a self-stabilizing fusion device. The stepped groove 151 also prevents the screw caps connected to the fusion device 200 from protruding from the first plate 1, thereby reducing the overall notch of the spinal fixation plate system 100 and the fusion device 200.

[0037] The first plate 1 is provided with a plurality of first bending grooves 11, which are spaced apart along the length direction of the first plate 1. Optionally, the first plate 1 has a first surface 161 and a second surface 162 opposite to each other in its thickness direction, and the plurality of first bending grooves 11 are provided on the first surface 161. When the spinal fixation plate system 100 is installed on the vertebral body, the first surface 161 is adjacent to the vertebral body relative to the second surface 162.

[0038] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown, the first bending groove 11 extends along the width direction of the first plate 1. This not only makes it easier and more convenient to bend the first plate 1 in the vertical direction, but also increases the bending range of the first plate 1 in the vertical direction, so as to further enhance the applicability of the spinal fixation plate system 100 and further expand the scope of application of the spinal fixation plate system 100.

[0039] Optionally, the first bending groove 11 extends through the first plate 1 along its width. This not only makes it easier and more convenient to bend the first plate 1 vertically, but also increases the bending range of the first plate 1 in the vertical direction, thereby further enhancing the applicability of the spinal fixation plate system 100 and expanding its application scope. The first bending groove 11 is an arc-shaped groove or a V-shaped groove.

[0040] like Figure 1 , Figure 4 and Figure 7 As shown, multiple first bending grooves 11 are located between the first mounting screw 5 and the second mounting screw 6 along the length of the first plate 1, and multiple first bending grooves 11 are located between the first anti-retraction screw 7 and the second anti-retraction screw 8 along the length of the first plate 1. This makes the structure of the spinal fixation plate system 100 more reasonable.

[0041] like Figure 4 and Figure 5 As shown, the spinal fixation plate system 100 further includes a second plate 2, which is cross-connected to the first plate 1. By providing the second plate 2, the second plate 2 can be used to fit the fusion device 200 and the surrounding vertebral bodies, so that more bone fragments, bone filling materials, etc. can be filled in the fusion device 200 and the gaps around the fusion device 200, thereby promoting the fusion of the fusion device 200 and the vertebral bodies.

[0042] like Figure 5As shown, the second plate 2 is provided with a second bending groove 21, which extends along the width direction of the second plate 2 (the length direction of the first plate 1). This allows for convenient and easy bending of the second plate 2, enabling it to better fit the fusion device 200 and the surrounding vertebral bodies. This allows for the filling of more bone fragments and bone filling materials within and around the fusion device 200, thereby promoting fusion between the fusion device 200 and the vertebral bodies. For example, by bending the second plate 2, it can cover the operating hole 210 of the fusion device 200, preventing bone fragments and bone filling materials filled within the fusion device 200 from falling out or detaching from the operating hole 210 before fusion.

[0043] Optionally, the second bending groove 21 is an arc-shaped groove or a V-shaped groove, and the second bending groove 21 extends through the second plate 2 along the width direction of the second plate 2. This can make the structure of the spinal fixation plate system 100 more reasonable.

[0044] Both the first plate 1 and the second plate 2 can be curved, which allows the spinal fixation plate system 100 to fit more closely to the vertebral surface. The second plate 2 and the first plate 1 are integrally formed, which can improve the structural strength of the spinal fixation plate system 100 and reduce the manufacturing difficulty and cost of the spinal fixation plate system 100.

[0045] like Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the first mounting screw 5 and the second mounting screw 6 are spaced apart along the length of the first plate 1. The first plate 1 is provided with a first mounting hole 13 and a second mounting hole 14. A portion of the first mounting screw 5 is provided in the first mounting hole 13, and a portion of the second mounting screw 6 is provided in the second mounting hole 14.

[0046] like Figures 8-10 As shown, the first mounting screw 5 includes a first ball head 51, a first arc transition portion 52, and a third shank portion 53 connected in sequence. The cross-sectional area of ​​the first arc transition portion 52 decreases along the direction from the first ball head 51 to the third shank portion 53. This effectively increases the structural strength of the first arc transition portion 52, thereby effectively increasing the structural strength at the neck of the first mounting screw 5, so as to avoid the first mounting screw 5 from breaking during or after surgery, helping patients reduce pain and recover their health as soon as possible.

[0047] The first mounting hole 13 includes a first ball-and-socket section 131, a first cylindrical section 132, and a first expansion section 133 arranged sequentially along the thickness direction of the first plate 1. The first ball head 51 is rotatably fitted within the first ball-and-socket section 131. The diameter of the first cylindrical section 132 is larger than the maximum diameter of the first arc transition portion 52, and the diameter of the first cylindrical section 132 is smaller than the diameter of the first ball head 51.

[0048] By making the diameter of the first cylindrical segment 132 larger than the maximum diameter of the first arc transition portion 52 and smaller than the diameter of the first ball head 51, not only can the third rod portion 53 and the first arc transition portion 52 pass through the first cylindrical segment 132, but the first plate 1 also has sufficient strength to support the first mounting screw 5. By providing the first expansion segment 133, the first plate 1 will not interfere with the first mounting screw 5 when it rotates relative to the first plate 1.

[0049] like Figures 8-10 As shown, the second mounting screw 6 includes a second ball head 61, a second arcuate transition portion 62, and a fourth shank portion 63 connected in sequence. The cross-sectional area of ​​the second arcuate transition portion 62 decreases along the direction from the second ball head 61 to the fourth shank portion 63. This effectively increases the structural strength of the second arcuate transition portion 62, thereby effectively increasing the structural strength at the neck of the second mounting screw 6, so as to avoid the second mounting screw 6 from breaking during or after surgery, helping patients reduce pain and recover their health as soon as possible.

[0050] The second mounting hole 14 includes a second ball-and-socket section 141, a second cylindrical section 142, and a second expansion section 143 arranged sequentially along the thickness direction of the first plate 1. The second ball head 61 is rotatably fitted within the second ball-and-socket section 141. The diameter of the second cylindrical section 142 is larger than the maximum diameter of the second arc transition portion 62, and the diameter of the second cylindrical section 142 is smaller than the diameter of the second ball head 61.

[0051] By making the diameter of the second cylindrical segment 142 larger than the maximum diameter of the second arc transition portion 62 and smaller than the diameter of the second ball head 61, not only can the fourth rod portion 63 and the second arc transition portion 62 pass through the second cylindrical segment 142, but the first plate 1 also has sufficient strength to support the second mounting screw 6. By providing the second expansion segment 143, the first plate 1 will not interfere with the second mounting screw 6 when it rotates relative to the first plate 1.

[0052] Specifically, the third rod portion 53 is provided with a threaded portion 57, and the fourth rod portion 63 is provided with a threaded portion 67, which facilitates implantation into the vertebral body.

[0053] like Figure 1 , Figure 4 and Figure 8As shown, the first anti-retraction screw 7 is disposed in one of the first plate 1 and the first mounting screw 5, and the second anti-retraction screw 8 is disposed in one of the first plate 1 and the second mounting screw 6. For example, the first mounting screw 5 and the first anti-retraction screw 7 can be screwed into the upper vertebral body, and the second mounting screw 6 and the second anti-retraction screw 8 can be screwed into the lower vertebral body.

[0054] like Figure 8 and Figure 10 As shown, the first mounting screw 5 has a first mounting groove 54, and the first portion 75 of the first anti-reverse screw 7 fits into the first mounting groove 54. The second mounting screw 6 has a second mounting groove 64, and the first portion 85 of the second anti-reverse screw 8 fits into the second mounting groove 64. This allows for easier and more compact installation of the first anti-reverse screw 7 onto the first mounting screw 5 and the second anti-reverse screw 8 onto the second mounting screw 6.

[0055] like Figure 10 and Figure 11 As shown, the wall surface of the first mounting groove 54 is provided with one of a first locking protrusion 751 and a first locking groove 541, and the first portion 75 of the first anti-removal screw 7 is provided with the other of the first locking protrusion 751 and the first locking groove 541. The first locking protrusion 751 engages within the first locking groove 541. The wall surface of the second mounting groove 64 is provided with one of a second locking protrusion 851 and a second locking groove 641, and the first portion 75 of the second anti-removal screw 8 is provided with the other of the second locking protrusion 851 and the second locking groove 641. The second locking protrusion 851 engages within the second locking groove 641. This can further improve the anti-removal capability of the first anti-removal screw 7 and the second anti-removal screw 8, and further improve the pull-out resistance of the first anti-removal screw 7 and the second anti-removal screw 8.

[0056] Specifically, the first mounting groove 54 is provided with a first retaining groove 541, the first portion 75 of the first anti-reverse screw 7 is provided with a first retaining protrusion 751, the second mounting groove 64 is provided with a second retaining groove 641, and the first portion 85 of the second anti-reverse screw 8 is provided with a second retaining protrusion 851. It can be understood that the cooperation of the retaining protrusion and the retaining groove effectively prevents the mounting screw and the anti-reverse screw from coming loose, while also ensuring simple and convenient installation. In other embodiments, other anti-reverse structures can also be used between the mounting screw and the anti-reverse screw, such as a threaded connection.

[0057] In this embodiment, the first part 75 of the first anti-return screw 7 and the first part 85 of the second anti-return screw 8 are both smooth rod structures, with a locking protrusion at one end of the smooth rod. At the same time, the mounting groove is set as a cylindrical channel to cooperate with the smooth rod. The smooth rod and cylindrical channel structure facilitates installation.

[0058] Specifically, the first anti-reverse screw 7 and the first mounting screw 5 form a first preset angle, which is greater than 10 degrees and less than or equal to 30 degrees. The second anti-reverse screw 8 and the second mounting screw 6 form a second preset angle, which is greater than 10 degrees and less than or equal to 30 degrees.

[0059] This not only avoids excessive length of the first anti-removal screw 7 and the second anti-removal screw 8, preventing a reduction in thread strength, but also ensures a larger contact area between the first and second anti-removal screws 7 and 8 and the vertebral body, thereby improving their anti-removal capability and resulting in a more stable installation of the spinal fixation plate system 100. When the first anti-removal screw 7 is located on the first mounting screw 5 and the second anti-removal screw 8 is located on the second mounting screw 6, the dimensions of the first mounting groove 54 of the first mounting screw 5 and the second mounting groove 64 of the second mounting screw 6 can be reduced, thus ensuring that the first mounting screw 5 and the second mounting screw 6 have sufficiently high structural strength.

[0060] In this embodiment, the anti-reverse screw and the mounting screw are installed at a preset angle by setting the axis of the mounting groove and the axis of the mounting screw to form a preset angle.

[0061] Optionally, the first preset angle is greater than 10 degrees and less than or equal to 19 degrees, and the second preset angle is greater than 10 degrees and less than or equal to 19 degrees.

[0062] This not only avoids the first anti-retraction screw 7 and the second anti-retraction screw 8 from being too long, thus preventing a reduction in the thread strength of the first anti-retraction screw 7 and the second anti-retraction screw 8, but also ensures that the first anti-retraction screw 7 and the second anti-retraction screw 8 have a large contact area with the vertebral body, so as to improve the anti-retraction ability of the first anti-retraction screw 7 and the second anti-retraction screw 8, thereby more stably installing the spinal fixation plate system 100.

[0063] Specifically, when the first preset angle is greater than 19 degrees and the second preset angle is greater than 19 degrees, the dimensions of the first mounting groove 54 and the second mounting groove 64 will be larger, thereby reducing the structural strength of the first mounting screw 5 and the second mounting screw 6. When the first preset angle is less than 10 degrees and the second preset angle is less than 10 degrees, the lengths of the first anti-retraction screw 7 and the second anti-retraction screw 8 will be too large to allow them to be driven into the vertebral body, thereby reducing the thread strength of the first anti-retraction screw 7 and the second anti-retraction screw 8. Furthermore, the contact area between the first anti-retraction screw 7 and the second anti-retraction screw 8 and the vertebral body will be smaller, thereby reducing the anti-retraction capability of the first anti-retraction screw 7 and the second anti-retraction screw 8.

[0064] like Figure 1 , Figure 4 , Figure 8 , Figure 11 and Figure 12 As shown, the first anti-return screw 7 includes a first rod portion 71 and a first threaded portion 72, with the first threaded portion 72 disposed on the first rod portion 71. The second anti-return screw 8 includes a second rod portion 81 and a second threaded portion 82, with the second threaded portion 82 disposed on the second rod portion 81.

[0065] Optionally, the rake angle α1 of the first threaded portion 72 is greater than or equal to 20 degrees and less than or equal to 50 degrees, and the rake angle α2 of the second threaded portion 82 is greater than or equal to 20 degrees and less than or equal to 50 degrees. This not only makes it easier for the first anti-removal screw 7 and the second anti-removal screw 8 to be screwed into the vertebral body, but also effectively ensures the volume of the first threaded portion 72 and the second threaded portion 82 screwed into the vertebral body, thereby effectively ensuring that the first anti-removal screw 7 and the second anti-removal screw 8 have excellent anti-removal ability, so as to more securely install the spinal fixation plate system 100.

[0066] In other words, when the rake angle α1 of the first threaded portion 72 is less than 20 degrees and the rake angle α2 of the second threaded portion 82 is less than 20 degrees, it increases the difficulty of screwing the first anti-removal screw 7 and the second anti-removal screw 8 into the vertebral body. The larger the rake angle α1 of the first threaded portion 72 and the rake angle α2 of the second threaded portion 82, the easier it is for the first anti-removal screw 7 and the second anti-removal screw 8 to screw into the vertebral body. However, when the rake angle α1 of the first threaded portion 72 is greater than 50 degrees and the rake angle α2 of the second threaded portion 82 is greater than 50 degrees, it will result in the first threaded portion 72 and the second threaded portion 82 being too small in size when screwed into the vertebral body, thereby reducing the anti-removal ability of the first anti-removal screw 7 and the second anti-removal screw 8, and reducing the pull-out resistance of the first anti-removal screw 7 and the second anti-removal screw 8.

[0067] Optionally, the rake angle α1 of the first threaded portion 72 is greater than or equal to 24 degrees and less than or equal to 36 degrees, or greater than or equal to 44 degrees and less than or equal to 46 degrees, and the rake angle α2 of the second threaded portion 82 is greater than or equal to 24 degrees and less than or equal to 36 degrees, or greater than or equal to 44 degrees and less than or equal to 46 degrees. This not only makes it easier for the first anti-removal screw 7 and the second anti-removal screw 8 to be screwed into the vertebral body, but also effectively ensures the volume of the first threaded portion 72 and the second threaded portion 82 screwed into the vertebral body, thereby effectively ensuring that the first anti-removal screw 7 and the second anti-removal screw 8 have excellent anti-removal capability, so as to more securely install the spinal fixation plate system 100.

[0068] Optionally, the rake angle α1 of the first threaded portion 72 is greater than or equal to 24 degrees and less than or equal to 26 degrees, or greater than or equal to 34 degrees and less than or equal to 36 degrees, or greater than or equal to 44 degrees and less than or equal to 46 degrees, and the rake angle α2 of the second threaded portion 82 is greater than or equal to 24 degrees and less than or equal to 26 degrees, or greater than or equal to 34 degrees and less than or equal to 36 degrees, or greater than or equal to 44 degrees and less than or equal to 46 degrees. This not only makes it easier for the first anti-removal screw 7 and the second anti-removal screw 8 to be screwed into the vertebral body, but also effectively ensures the volume of the first threaded portion 72 and the second threaded portion 82 screwed into the vertebral body, thereby effectively ensuring that the first anti-removal screw 7 and the second anti-removal screw 8 have excellent anti-removal capability, so as to more securely install the spinal fixation plate system 100.

[0069] Optionally, the thread clearance angle β1 of the first threaded portion 72 is greater than or equal to 3 degrees and less than or equal to 10 degrees, and the thread clearance angle β2 of the second threaded portion 82 is greater than or equal to 3 degrees and less than or equal to 10 degrees. This not only improves the structural strength of the first threaded portion 72 and the second threaded portion 82, but also gives the first anti-removal screw 7 and the second anti-removal screw 8 excellent anti-removal capability, so as to more securely install the spinal fixation plate system 100.

[0070] In other words, when the thread clearance angle β1 of the first threaded portion 72 is greater than 10 degrees and the thread clearance angle β2 of the second threaded portion 82 is greater than 10 degrees, although the thread profile angles of the first threaded portion 72 and the second threaded portion 82 can be increased to improve their structural strength, it will reduce the anti-removal capability of the first anti-removal screw 7 and the second anti-removal screw 8, that is, reduce their pull-out resistance. When the thread clearance angle β1 of the first threaded portion 72 is less than 3 degrees and the thread clearance angle β2 of the second threaded portion 82 is less than 3 degrees, the thread profile angles of the first anti-removal screw 7 and the second anti-removal screw 8 will be too small, resulting in insufficient structural strength of the first threaded portion 72 and the second threaded portion 82.

[0071] Optionally, the thread clearance angle β1 of the first threaded portion 72 is greater than or equal to 4 degrees and less than or equal to 6 degrees, or greater than or equal to 8 degrees and less than or equal to 10 degrees, and the thread clearance angle β2 of the second threaded portion 82 is greater than or equal to 4 degrees and less than or equal to 6 degrees, or greater than or equal to 8 degrees and less than or equal to 10 degrees. This not only improves the structural strength of the first threaded portion 72 and the second threaded portion 82, but also gives the first anti-removal screw 7 and the second anti-removal screw 8 excellent anti-removal capability, so as to more securely install the spinal fixation plate system 100.

[0072] like Figure 12As shown, the first threaded portion 72 has a first surface 73 and a second surface 74 opposite to each other along the length of the first rod portion 71. The first surface 73 includes a first arcuate portion 731 connected to the first rod portion 71, and the second surface 74 includes a second arcuate portion 741 connected to the first rod portion 71. The second threaded portion 82 has a third surface 83 and a fourth surface 84 opposite to each other along the length of the second rod portion 81. The third surface 83 includes a third arcuate portion 831 connected to the second rod portion 81, and the fourth surface 84 includes a fourth arcuate portion 841 connected to the second rod portion 81. This allows for a more rational structure for the first anti-return screw 7 and the second anti-return screw 8.

[0073] Optionally, the first surface 73 is farther away from the first plate 1 relative to the second surface 74 in the length direction of the first rod portion 71, and the third surface 83 is farther away from the first plate 1 relative to the fourth surface 84 in the length direction of the first rod portion 71.

[0074] Optionally, the radius r1 of the first arc portion 731 is greater than or equal to 0.6 mm and less than or equal to 1.5 mm, and the radius r3 of the third arc portion 831 is greater than or equal to 0.6 mm and less than or equal to 1.5 mm. This avoids stress concentration at the root of the first thread portion 72 and the second thread portion 82 due to the small angle, which would reduce the thread strength of the first thread portion 72 and the second thread portion 82. Furthermore, it avoids the situation where the radius r1 of the first arc portion 731 and the radius r3 of the third arc portion 831 are too large, resulting in an excessively small thread portion of the first thread portion 72 and the second thread portion 82, thereby reducing the anti-removal capability of the first anti-removal screw 7 and the second anti-removal screw 8, and reducing their pull-out resistance.

[0075] In other words, when the radius r1 of the first arc portion 731 is less than 0.6 mm and the radius r3 of the third arc portion 831 is less than 0.6 mm, the root angles of the first thread portion 72 and the second thread portion 82 will be too small, resulting in stress concentration and thus reducing the thread strength of the first thread portion 72 and the second thread portion 82. When the radius r1 of the first arc portion 731 is greater than 1.5 mm and the radius r3 of the third arc portion 831 is greater than 1.5 mm, the thread portions of the first thread portion 72 and the second thread portion 82 will be too small, thus reducing the anti-removal capability of the first anti-removal screw 7 and the second anti-removal screw 8, that is, reducing the pull-out resistance of the first anti-removal screw 7 and the second anti-removal screw 8.

[0076] Optionally, the radius r1 of the first arc portion 731 is greater than or equal to 0.8 mm and less than or equal to 1.2 mm, and the radius r3 of the third arc portion 831 is greater than or equal to 0.8 mm and less than or equal to 1.2 mm. This not only further eliminates stress concentration to further improve the thread strength of the first thread portion 72 and the second thread portion 82, but also increases the size of the threaded portion of the first thread portion 72 and the second thread portion 82, thereby further improving the anti-removal capability and pull-out resistance of the first anti-removal screw 7 and the second anti-removal screw 8.

[0077] Optionally, the radius r2 of the second arc portion 741 is greater than or equal to 0.3 mm and less than or equal to 1 mm, and the radius r4 of the fourth arc portion 841 is greater than or equal to 0.3 mm and less than or equal to 1 mm. This avoids stress concentration at the root of the first thread portion 72 and the second thread portion 82 due to the small angle, which would reduce the thread strength of the first thread portion 72 and the second thread portion 82. Furthermore, it avoids the thread portions of the first thread portion 72 and the second thread portion 82 becoming too small due to excessively large radii r2 of the second arc portion 741 and r4 of the fourth arc portion 841, thereby reducing the anti-retraction capability of the first anti-retraction screw 7 and the second anti-retraction screw 8, and reducing their pull-out resistance.

[0078] In other words, when the radius r2 of the second arc portion 741 is less than 0.3 mm and the radius r4 of the fourth arc portion 841 is less than 0.3 mm, the root angles of the first thread portion 72 and the second thread portion 82 will be too small, resulting in stress concentration and thus reducing the thread strength of the first thread portion 72 and the second thread portion 82. When the radius r2 of the second arc portion 741 is greater than 1 mm and the radius r4 of the fourth arc portion 841 is greater than 1 mm, the thread portions of the first thread portion 72 and the second thread portion 82 will be too small, thus reducing the anti-removal capability of the first anti-removal screw 7 and the second anti-removal screw 8, that is, reducing the pull-out resistance of the first anti-removal screw 7 and the second anti-removal screw 8.

[0079] Optionally, the radius r2 of the second arc portion 741 is greater than or equal to 0.5 mm and less than or equal to 0.8 mm, and the radius r4 of the fourth arc portion 841 is greater than or equal to 0.5 mm and less than or equal to 0.8 mm. This not only further eliminates stress concentration to further improve the thread strength of the first thread portion 72 and the second thread portion 82, but also increases the size of the threaded portion of the first thread portion 72 and the second thread portion 82, thereby further improving the anti-removal capability and pull-out resistance of the first anti-removal screw 7 and the second anti-removal screw 8.

[0080] Optionally, the first surface 73 further includes a first planar portion 732, the second surface 74 further includes a second planar portion 742, the third surface 83 further includes a third planar portion 832, and the fourth surface 84 further includes a fourth planar portion 842. Specifically, it also has a first plane perpendicular to the length direction of the first anti-return screw 7 and a second plane perpendicular to the length direction of the second anti-return screw 8. In this embodiment, the first planar portion 732 and the second planar portion 742 are connected by an arc in a direction away from the first rod portion 71 to form the threads of the first threaded portion 72. The third planar portion 832 and the fourth planar portion 842 are similar and will not be described in detail here.

[0081] In this embodiment, the rake angle α1 of the first threaded portion 72 is the angle between the first planar portion 732 and the first plane, and the clearance angle β1 of the first threaded portion 72 is the angle between the second planar portion 742 and the first plane. The rake angle α2 of the second threaded portion 82 is the angle between the third planar portion 832 and the second plane, and the clearance angle β2 of the second threaded portion 82 is the angle between the fourth surface 84 and the second plane.

[0082] Optionally, the end of the first mounting screw 5 is provided with a drive groove 56, and the side of the end of the shank of the first mounting screw 5 is provided with a self-tapping groove 55. The end of the second mounting screw 6 is provided with a drive groove 66, and the side of the end of the shank of the second mounting screw 6 is provided with a self-tapping groove 65. By providing the self-tapping grooves 55 and 65, the first mounting screw 5 and the second mounting screw 6 can be easily and quickly screwed into the vertebral body, while strengthening the pull-out resistance of the first mounting screw 5 and the second mounting screw 6.

[0083] By providing drive slots 56 and 66, it is easier to use tools to screw the first mounting screw 5 and the second mounting screw 6 into the cone body. For example, drive slot 56 is shaped like a star or a hexagon, and drive slot 66 is shaped like a star or a hexagon.

[0084] Optionally, the first anti-removal screw 7 has a self-tapping groove 76 on the side of its shank end away from its first portion 75, and a drive groove 77 is provided at the end of its first portion 75. The second anti-removal screw 8 has a self-tapping groove 86 on the side of its shank end away from its first portion 85, and a drive groove 87 is provided at the end of its first portion 85. By providing the self-tapping grooves 76 and 86, the first anti-removal screw 7 and the second anti-removal screw 8 can be easily and quickly screwed into the vertebral body, while strengthening the pull-out resistance of the first anti-removal screw 7 and the second anti-removal screw 8.

[0085] By providing drive slots 77 and 87, it is easier to use tools to screw the first anti-retraction screw 7 and the second anti-retraction screw 8 into the vertebral body. For example, drive slot 77 is shaped like a star or a hexagon, and drive slot 87 is shaped like a star or a hexagon.

[0086] Optionally, the first anti-removal screw 7 is a self-tapping screw, with a self-tapping dowel at the end of its shank. The second anti-removal screw 8 is also a self-tapping screw, with a self-tapping dowel at the end of its shank. This allows the first and second anti-removal screws 7 and 8 to be easily and quickly screwed into the vertebral body, while simultaneously enhancing their pull-out resistance. In other embodiments, the first anti-removal screw 7 may also be a self-drilling screw, with a self-drilling tip at the end of its shank. The second anti-removal screw 8 may also be a self-drilling screw, with a self-drilling tip at the end of its shank.

[0087] Optionally, the major diameter of the threaded portion 57 of the first mounting screw 5 is shaped like a shuttle from the tip of the first mounting screw 5 to the first ball head 51. Specifically, the major diameter of the threaded portion 57 gradually increases from the tip of the first mounting screw 5 to a gentler area in the middle, and then gradually increases again from the gentler area in the middle until it approaches the first arc transition portion 52. This not only allows the first mounting screw 5 to be easily and quickly screwed into the cone body, but also increases the pull-out resistance of the first mounting screw 5.

[0088] Optionally, the major diameter of the threaded portion 67 of the second mounting screw 6 is shaped like a shuttle from the tip of the second mounting screw 6 to the second ball head 61. Specifically, the major diameter of the threaded portion 67 gradually increases from the tip of the second mounting screw 6 to a gentler area in the middle, and then gradually increases again from the gentler area in the middle until it approaches the second arc transition portion 62. This not only allows the second mounting screw 6 to be easily and quickly screwed into the cone body, but also increases the pull-out resistance of the second mounting screw 6.

[0089] The first threaded portion 72 of the first anti-removal screw 7 has a spindle-shaped profile. The first threaded portion 72 includes a first tapered section 721 near the tip of the first anti-removal screw 7, a first straight section 722 in the middle, and a second tapered section 723 away from the tip of the first anti-removal screw 7. Both the first tapered section 721 and the second tapered section 723 gradually widen from the tip away from the tip. This not only allows the first anti-removal screw 7 to be easily and quickly screwed into the vertebral body, but also increases the pull-out resistance of the first anti-removal screw 7.

[0090] The second threaded portion 82 of the second anti-removal screw 8 has a spindle-shaped profile. The second threaded portion 82 includes a third tapered section 821 near the tip of the second anti-removal screw 8, a second straight section 822 in the middle, and a fourth tapered section 823 away from the tip of the second anti-removal screw 8. Both the third tapered section 821 and the fourth tapered section 823 gradually widen from the tip away from the tip. This not only allows the second anti-removal screw 8 to be easily and quickly screwed into the cone body, but also increases the pull-out resistance of the second anti-removal screw 8.

[0091] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0094] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0095] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0096] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A spinal fixation plate system, characterized in that, include: A first plate, wherein the first plate is provided with a first bending groove extending along the width direction of the first plate; A first mounting screw and a second mounting screw are provided on the first plate body at a distance from each other along the length direction of the first plate body, and both the first mounting screw and the second mounting screw can be connected to the cone body. A first anti-retraction screw, wherein the first anti-retraction screw is disposed on one of the first plate and the first mounting screw and is capable of being connected to the cone body, and the first anti-retraction screw forms a first preset angle with the first mounting screw; and The second anti-retraction screw is disposed on one of the first plate and the second mounting screw and can be connected to the cone. The second anti-retraction screw and the second mounting screw form a second preset angle.

2. The spinal fixation plate system according to claim 1, characterized in that, The first bending groove is provided in multiple parts and is spaced apart along the length direction of the first plate. And / or, the first bending groove is an arc-shaped groove or a V-shaped groove; And / or, a plurality of the first bending grooves are located between the first mounting screw and the second mounting screw in the length direction of the first plate body, and a plurality of the first bending grooves are located between the first anti-retraction screw and the second anti-retraction screw in the length direction of the first plate body; And / or, it also includes a second plate body, which is cross-connected to the first plate body; And / or, an observation window is provided on the first plate; And / or, the first plate is arc-shaped; And / or, the first preset included angle is greater than 10 degrees and less than or equal to 19 degrees; And / or, the second preset included angle is greater than 10 degrees and less than or equal to 19 degrees.

3. The spinal fixation plate system according to claim 2, characterized in that, The second plate is provided with a second bending groove extending along the width direction of the second plate; And / or, the second plate and the first plate are integrally formed; And / or, the second plate is arc-shaped; And / or, the observation window is provided with a stepped groove.

4. The spinal fixation plate system according to claim 1, characterized in that, The first anti-reverse screw includes a first threaded portion, wherein the rake angle of the first threaded portion is greater than or equal to 20 degrees and less than or equal to 50 degrees, and / or the clearance angle of the first threaded portion is greater than or equal to 3 degrees and less than or equal to 10 degrees; and / or, The second anti-reverse screw includes a second threaded portion, wherein the thread rake angle of the second threaded portion is greater than or equal to 20 degrees and less than or equal to 50 degrees, and / or the thread clearance angle of the second threaded portion is greater than or equal to 3 degrees and less than or equal to 10 degrees.

5. The spinal fixation plate system according to claim 4, characterized in that, The thread rake angle of the first threaded portion is greater than or equal to 24 degrees and less than or equal to 36 degrees, or greater than or equal to 44 degrees and less than or equal to 46 degrees. And / or, the rake angle of the second threaded portion is greater than or equal to 24 degrees and less than or equal to 36 degrees or greater than or equal to 44 degrees and less than or equal to 46 degrees; And / or, the thread clearance angle of the first threaded portion is greater than or equal to 4 degrees and less than or equal to 6 degrees or greater than or equal to 8 degrees and less than or equal to 10 degrees; And / or, the thread clearance angle of the second threaded portion is greater than or equal to 4 degrees and less than or equal to 6 degrees or greater than or equal to 8 degrees and less than or equal to 10 degrees.

6. The spinal fixation plate system according to claim 1, characterized in that, The first anti-return screw includes a first shank and a first threaded portion. The first threaded portion is disposed on the first shank. The first threaded portion has a first surface and a second surface that are opposite to each other in the length direction of the first shank. The first surface includes a first arc portion connected to the first shank, and the second surface includes a second arc portion connected to the first shank. And / or, the second anti-reverse screw includes a second shank portion and a second threaded portion, the second threaded portion being disposed on the second shank portion, the second threaded portion having a third surface and a fourth surface opposite to each other in the length direction of the second shank portion, the third surface including a third arc portion connected to the second shank portion, and the fourth surface including a fourth arc portion connected to the second shank portion.

7. The spinal fixation plate system according to claim 6, characterized in that, The radius of the first arc portion is greater than or equal to 0.6 mm and less than or equal to 1.5 mm; And / or, the radius of the second arc portion is greater than or equal to 0.3 mm and less than or equal to 1 mm; And / or, the radius of the third arc portion is greater than or equal to 0.6 mm and less than or equal to 1.5 mm; And / or, the radius of the fourth arc portion is greater than or equal to 0.3 mm and less than or equal to 1 mm; And / or, the outline of the first threaded portion is a shuttle-shaped structure, the first threaded portion includes a first tapered section near the tip of the first anti-return screw, a first straight section in the middle, and a second tapered section away from the tip of the first anti-return screw, the first tapered section and the second tapered section both gradually widen from the tip of the screw away from the tip of the screw; And / or, the profile of the second threaded portion is a shuttle-shaped structure, the second threaded portion includes a third tapered section near the tip of the second anti-return screw, a second straight section in the middle, and a fourth tapered section away from the tip of the second anti-return screw, the third tapered section and the fourth tapered section gradually widening from the tip of the screw away from the tip of the screw.

8. The spinal fixation plate system according to claim 7, characterized in that, The radius of the first arc portion is greater than or equal to 0.8 mm and less than or equal to 1.2 mm; or The radius of the second arc portion is greater than or equal to 0.5 mm and less than or equal to 0.8 mm; or The radius of the third arc portion is greater than or equal to 0.8 mm and less than or equal to 1.2 mm; or The radius of the fourth arc portion is greater than or equal to 0.5 mm and less than or equal to 0.8 mm.

9. The spinal fixation plate system according to claim 1, characterized in that, The first plate is provided with a first mounting hole, which includes a first ball-and-socket section, a first cylindrical section and a first expansion section arranged sequentially along the thickness direction of the first plate. The first mounting screw includes a first ball head, a first arc transition portion and a third rod portion connected in sequence. The cross-sectional area of ​​the first arc transition portion decreases along the direction from the first ball head to the third rod portion. The first ball head is rotatably fitted in the first ball-and-socket section. The diameter of the first cylindrical section is greater than the maximum diameter of the first arc transition portion and the diameter of the first cylindrical section is smaller than the diameter of the first ball head. And / or, the first plate is provided with a second mounting hole, the second mounting hole including a second ball socket section, a second cylindrical section and a second expansion section arranged sequentially along the thickness direction of the first plate, the second mounting screw including a second ball head, a second arc transition portion and a fourth rod portion connected in sequence, the cross-sectional area of ​​the second arc transition portion decreasing along the direction from the second ball head to the fourth rod portion, wherein the second ball head is rotatably fitted in the second ball socket section, the diameter of the second cylindrical section is greater than the maximum diameter of the second arc transition portion, and the diameter of the second cylindrical section is smaller than the diameter of the second ball head; And / or, the first mounting screw is provided with a first mounting groove, the first part of the first anti-return screw is fitted in the first mounting groove, wherein the wall surface of the first mounting groove is provided with one of a first latching protrusion and a first latching groove, the first part of the first anti-return screw is provided with the other of the first latching protrusion and the first latching groove, and the first latching protrusion is engaged in the first latching groove. And / or, the second mounting screw is provided with a second mounting groove, the first part of the second anti-return screw is fitted in the second mounting groove, wherein the wall surface of the second mounting groove is provided with one of a second latching protrusion and a second latching groove, the first part of the second anti-return screw is provided with the other of a second latching protrusion and a second latching groove, and the second latching protrusion is engaged in the second latching groove; And / or, the end of the first mounting screw is provided with a drive groove; And / or, the side of the end of the shank of the first mounting screw is provided with a self-tapping groove; And / or, the end of the second mounting screw is provided with a drive groove; And / or, the side of the end of the shank of the second mounting screw is provided with a self-tapping groove.

10. The spinal fixation plate system according to claim 9, characterized in that, The first anti-return screw is a self-tapping screw, and the end of the shank of the first anti-return screw is provided with a self-tapping dot; or, the first anti-return screw is a self-drilling screw, and the end of the shank of the first anti-return screw is provided with a self-drilling tip. And / or, the first anti-return screw has a self-tapping groove on the side of the shank end away from its first portion; And / or, the first anti-reverse screw is provided with a drive groove at the end of its first portion; And / or, the second anti-return screw is a self-tapping screw, and the end of the shank of the second anti-return screw is provided with a self-tapping dot; or, the second anti-return screw is a self-drilling screw, and the end of the shank of the second anti-return screw is provided with a self-drilling tip. And / or, the second anti-return screw has a self-tapping groove on the side of the shank end away from its first portion; And / or, the second anti-reverse screw has a drive groove at the end of its first portion.

Images