Pedicle screw and pedicle fixing system

Abstract

The invention discloses a pedicle screw and a pedicle fixing system.The pedicle screw is used for connecting a vertebral body and a pedicle which are cut off and comprises a screw body, the screw body is provided with a vertebral body threaded section and a pedicle threaded section which are connected, and the outer diameter of the vertebral body threaded section is not larger than that of the pedicle threaded section; the thread pitch of the thread section is smaller than that of the pedicle thread section; wherein the vertebral body threaded section is used for penetrating through a vertebral pedicle and is rotatably implanted into a vertebral body, and when the vertebral body threaded section extends into the vertebral body, the vertebral pedicle threaded section can be dragged to be rotatably implanted into the vertebral pedicle. According to the scheme, in the process of fixing the vertebral pedicle screw, the vertebral pedicle behind the vertebral canal, vertebral plate spinous processes and other tissues can be integrally moved backwards and fixed, the purpose of pressure reduction and fixation is achieved, a fixing instrument for assisting in fixing the vertebral pedicle does not need to be arranged, the surgical field of an affected part is expanded, surgical steps are simplified, and surgical difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a pedicle screw and a pedicle fixation system. Background Art

[0002] During posterior thoracic controlled postdisplacement and fusion surgery (PCPF), a pedicle screw system is often used to maintain spinal alignment and stability. Specifically, a transpedicular or translateral approach is performed using an instrument such as an ultrasonic osteotome to perform osteotomy at the junction of the thoracic pedicle and vertebral body. Pedicle screws are then implanted. These screws displace the pedicle, lamina, and spinous processes relative to the vertebral body, thereby expanding the spinal canal and achieving direct or indirect decompression of the spinal cord.

[0003] Publication No. CN106264699A discloses a pedicle screw that utilizes a U-shaped connecting rod, which ensures more stable contact between the top screw and the connecting rod. While maintaining the same locking effect on the top screw, the connecting rod can evenly distribute the positive pressure, reducing the incidence of top screw burst. Furthermore, the U-shaped shape resists rotation, reducing the likelihood of cross-connections. Furthermore, the U-shaped column has greater strength than a cylindrical one, allowing for a smaller connecting rod size, thereby reducing the overall size of the pedicle screw system.

[0004] However, since the pitch of the pedicle screw body in the prior art is usually equal, when used to connect the pedicle and cone after osteotomy, in order to prevent the pedicle screw from moving the pedicle forward and narrowing the spinal canal again, it is generally necessary to fix the pedicle with a fixation device after moving the pedicle backward to expand the spinal canal, and finally fix the pedicle screw. The steps are relatively cumbersome, and the fixation device used to fix the pedicle occupies the space of the affected area, increasing the difficulty of the operation. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a pedicle screw to solve the technical problem that in the prior art, the pitch of the pedicle screw body is usually equal. When used to connect the pedicle and cone after osteotomy and resection, in order to avoid the pedicle being driven forward by the pedicle screw and shrinking the spinal canal again, generally after the pedicle is moved backward to expand the spinal canal, the pedicle needs to be fixed by a fixing device, and finally the pedicle screw is fixed. The steps are relatively cumbersome, and the fixing device used to fix the pedicle occupies the space of the affected area, increasing the difficulty of the operation.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a pedicle screw for connecting a separated vertebral body and a pedicle, the pedicle screw comprising a screw body having a connected vertebral body thread segment and a pedicle thread segment, wherein the outer diameter of the vertebral body thread segment is not greater than the outer diameter of the pedicle thread segment, and the pitch of the vertebral body thread segment is less than the pitch of the pedicle thread segment; The vertebral body threaded section is used to pass through the pedicle and be rotated and implanted into the vertebral body, and when extending into the vertebral body, it can pull the pedicle threaded section to be rotated and implanted into the pedicle.

[0007] In one embodiment, the pitch of the pedicle thread segment gradually increases in a direction away from the vertebral body thread segment; and / or, The pitch of the vertebral body thread segment gradually increases in a direction approaching the pedicle thread segment.

[0008] In one embodiment, the pitch of the vertebral thread segment is d1, which satisfies 1 mm ≤ d1 ≤ 2 mm; The pitch of the pedicle thread segment is d2, which satisfies 2 mm ≤ d2 ≤ 3 mm.

[0009] In one embodiment, the end of the vertebral thread segment away from the pedicle thread segment is a screw-in end, and the end of the pedicle thread segment away from the vertebral thread segment is a connecting end; The outer diameter of the screw body gradually increases from the screw-in end to the connecting end and is tapered.

[0010] In one embodiment, the taper of the screw body is α, which satisfies 1 / 30≤α≤1 / 25.

[0011] In one embodiment, the screw body further comprises a fixing section, wherein the fixing section, the pedicle threaded section and the vertebral body threaded section are sequentially connected, the fixing section is provided with a mounting groove, the inner wall of the mounting groove is provided with an internal thread, and has avoidance openings located on both sides of the fixing section in the radial direction, and has a mounting opening located on the side of the fixing section away from the pedicle threaded section; The pedicle screw further comprises a compression screw, which can be screwed into the mounting groove from the mounting opening and is used for compressing the connecting rod extending from the avoidance opening into the mounting groove.

[0012] In one embodiment, the outer wall of the fixing section is provided with an external thread, and the outer diameter of the external thread is not less than the outer diameter of the pedicle thread section.

[0013] In one embodiment, the internal thread is spaced apart from the bottom wall of the mounting groove.

[0014] In one embodiment, the pressing screw is provided with a limiting hole along its axial direction, the cross section of the limiting hole is polygonal, and at least one end is open.

[0015] In one embodiment, the pedicle threaded section and the vertebral body threaded section are integrally provided.

[0016] In a second aspect, the present invention further provides a pedicle fixation system, comprising a pedicle screw as described in any one of the above.

[0017] Compared with the prior art, in the pedicle screw provided by the present invention, during surgery, a preset number of screw channels are first opened on the pedicle, and the inner diameter of the screw channel must be just enough for the vertebral thread segment to bite through. After the C-arm fluoroscopy confirms that the screw channel is in a good position, the pedicle is cut off from the vertebral body and the cut pedicle is kept against the vertebral body.

[0018] The vertebral threaded section is then inserted into the screw channel on the pedicle and gradually screwed into the vertebral body. As the vertebral threaded section is inserted into the vertebral body, it drives the pedicle threaded section toward the pedicle until the pedicle threaded section is also screwed into the pedicle. Because the outer diameter of the pedicle threaded section is not smaller than that of the vertebral threaded section, the pedicle threaded section can also engage the inner wall of the pedicle screw channel.

[0019] At the same time, because the pitch of the pedicle thread segment is greater than the pitch of the vertebral thread segment, when the screw body rotates one circle, the amount of screwing of the pedicle thread segment relative to the pedicle is greater than the amount of screwing of the vertebral thread segment relative to the vertebral body. This allows the pedicle thread segment to generate axial thrust on the pedicle, pushing the pedicle away from the vertebral body, thereby expanding the spinal canal space. As a result, during the process of fixing the pedicle screw, the pedicle and lamina spinous process and other tissues behind the spinal canal can be moved backward and fixed as a whole, achieving the purpose of decompression and fixation. There is no need to set up auxiliary fixation instruments for pedicle fixation, which expands the surgical field of view of the affected area, simplifies the surgical steps, and reduces the difficulty of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a pedicle screw provided by an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the screw body connecting the pedicle and vertebral body; Figure 3 yes Figure 1 Exploded view of the pedicle screw; Figure 4 yes Figure 1 Schematic diagram of the screw body.

[0021] Description of reference numerals: 1. Screw body; 11. Vertebral threaded section; 111. Screw-in end; 12. Pedicle threaded section; 121. Connecting end; 13. Fixing section; 13a. Mounting slot; 13b. Mounting opening; 13c. Avoidance opening; 13d. Internal thread; 2. Pressing screw; 2a. Limiting hole; 3. Vertebral body; 4. Pedicle; 4a. Screw channel. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] In order to solve the technical problem that the pitch of the pedicle screw body is usually equal, when used to connect the pedicle and the cone after osteotomy, in order to avoid the pedicle screw driving the pedicle forward and narrowing the spinal canal again, generally after the pedicle is moved backward to expand the spinal canal, the pedicle needs to be fixed by a fixing device, and finally the pedicle screw is fixed. The steps are relatively cumbersome, and the fixing device for fixing the pedicle occupies the space of the affected part, which increases the difficulty of the operation. The present invention provides a pedicle screw. During the process of fixing the pedicle screw, the pedicle and vertebral lamina spinous process and other tissues behind the spinal canal can be moved backward and fixed as a whole, thereby achieving the purpose of decompression and fixation. There is no need to set a fixing device for auxiliary fixation of the pedicle, thereby expanding the surgical field of the affected part, simplifying the surgical steps, and reducing the difficulty of the operation.

[0024] It should be noted that the pedicle screw described in the present invention is used for but not limited to pedicle fixation systems, etc. For the convenience of explanation, in the present invention, only the application of pedicle screws to pedicle fixation systems is used as an example for explanation. The principles of applying pedicle screws to other types of equipment are essentially the same as those applied to pedicle fixation systems, and they will not be described in detail here.

[0025] See also Figures 1 to 3 , Figures 1 to 3 This is a structural schematic diagram of a pedicle screw in one embodiment of the present invention. The pedicle screw is used to connect the severed vertebral body 3 and the pedicle 4. The pedicle screw includes a screw body 1. The screw body 1 has a connected vertebral thread segment 11 and a pedicle thread segment 12. The outer diameter of the vertebral thread segment 11 is not larger than the outer diameter of the pedicle thread segment 12, and its pitch is smaller than the pitch of the pedicle thread segment 12; wherein, the vertebral thread segment 11 is used to pass through the pedicle 4 and be rotated and implanted into the vertebral body 3, and when extending into the vertebral body 3, it can pull the pedicle thread segment 12 to be rotated and implanted into the pedicle 4.

[0026] In the pedicle screw provided by the present invention, during surgery, a preset number of screw channels 4a are first opened on the pedicle 4. The inner diameter of the screw channel 4a needs to be just enough for the vertebral thread segment 11 to bite through. After the C-arm fluoroscopy confirms that the screw channel 4a is in a good position, the pedicle 4 is cut off from the vertebral body 3, and the cut pedicle 4 is kept against the vertebral body 3.

[0027] The vertebral threaded section 11 is then inserted into the screw channel 4a of the pedicle 4 and gradually screwed into the vertebral body 3. As the vertebral threaded section 11 is inserted into the vertebral body 3, it drives the pedicle threaded section 12 toward the pedicle 4 until the pedicle threaded section 12 is also screwed into the pedicle 4. Because the outer diameter of the pedicle threaded section 12 is not smaller than that of the vertebral threaded section 11, the pedicle threaded section 12 can also engage the inner wall of the screw channel 4a of the pedicle 4.

[0028] At the same time, because the pitch of the pedicle thread segment 12 is greater than the pitch of the vertebral body thread segment 11, when the screw body 1 rotates one circle, the amount of screwing of the pedicle thread segment 12 relative to the pedicle 4 is greater than the amount of screwing of the vertebral body thread segment 11 relative to the vertebral body 3, so that the pedicle thread segment 12 can generate an axial thrust on the pedicle 4, pushing the pedicle 4 away from the vertebral body 3, thereby expanding the spinal canal space. Therefore, during the process of fixing the pedicle screw, the pedicle 4 and the spinous processes of the vertebral lamina at the rear of the spinal canal can be moved backward and fixed as a whole, achieving the purpose of decompression and fixation. There is no need to set up a fixing device to assist in fixing the pedicle 4, which expands the surgical field of view of the affected area, simplifies the surgical steps, and reduces the difficulty of the operation.

[0029] It should be understood that when the vertebral thread segment 11 is screwed into the vertebral body 3 and the pedicle thread segment 12 is screwed into the pedicle 4, the relatively large pitch of the pedicle thread segment 12 results in an increase in axial displacement per rotation. According to the formula L=nP, where L is the axial displacement, n is the number of rotations, and P is the pitch, the larger pitch at the top of the screw body 1 generates greater axial thrust at the same rotational speed, thereby pushing the pedicle 4 posteriorly.

[0030] In one embodiment, the pitch of the pedicle thread segment 12 gradually increases in a direction away from the vertebral body thread segment 11 ; and / or the pitch of the vertebral body thread segment 11 gradually increases in a direction approaching the pedicle thread segment 12 .

[0031] In this embodiment, the pitch of the screw body 1 is gradually increased from the screw-in end 111 to the connecting end 121. The gradual increase in the pitch can increase the axial displacement of each thread of the screw body 1. Since the screw body 1 and the inner wall of the screw channel 4a of the pedicle 4 are threaded together, the variable pitch design will generate an axial component force through the difference in the thread lead angle, further pushing the pedicle 4 to move backward relative to the vertebral body 3, thereby expanding the spinal canal space.

[0032] In one embodiment, the pitch of the vertebral body thread segment 11 is d1, which satisfies 1 mm≤d1≤2 mm; the pitch of the pedicle thread segment 12 is d2, which satisfies 2 mm≤d2≤3 mm.

[0033] In this embodiment, the pitch of the external threads of the screw body 1 gradually increases from the screw-in end 111 to the connection end 121. Specifically, in one embodiment, the values ​​d1 and d2 are set such that, with one rotation of the screw body 1, the vertebral thread segment 11 advances 1 mm and the pedicle thread segment 12 advances 2 mm. This ensures the engagement between the screw body 1 and the bone while maximizing the posterior displacement of the pedicle 4.

[0034] In addition, in one embodiment, the diameter of the vertebral body thread segment 11 is set to 4.0-5.5 mm, and the height is set to 15-25 mm, preferably the height is 20 mm; the diameter of the pedicle thread segment 12 is set to 5.5-6.5 mm, and the height is set to 10-15 mm, preferably the height is 10 mm.

[0035] Specifically, in another embodiment, a dense section with relatively dense threads and a sparse section with relatively sparse threads are provided on the pedicle thread segment 12 in a direction away from the vertebral body thread segment 11. The dense section has a diameter of 4.5 to 5.5 mm and a height of 5 mm, while the sparse section has a diameter of 5.5 to 6.5 mm and a height of 10 mm. The dense section is partially located within the pedicle 4 and partially located in the gap between the pedicle 4 and the vertebral body 3.

[0036] It should be understood that since the pitch of the pedicle thread segment 12 is larger than the pitch of the vertebral thread segment 11, during surgery, part of the pedicle thread segment 12 is usually exposed in the gap between the pedicle 4 and the vertebral body 3 to reduce the adverse effects of the external thread of the screw body 1 on the nerves and avoid irritation symptoms.

[0037] In one embodiment, the end of the vertebral thread segment 11 away from the pedicle thread segment 12 is the screw-in end 111, and the end of the pedicle thread segment 12 away from the vertebral thread segment 11 is the connecting end 121; the outer diameter of the screw body 1 gradually increases from the screw-in end 111 to the connecting end 121 and is conical.

[0038] In this embodiment, the outer diameter of the screw body 1 is gradually increased from the screw-in end 111 to the connecting end 121, forming a tapered shape to adapt to the density gradient of the pedicle 4 and improve the stability after implantation. Specifically, in this embodiment, the taper of the screw body 1 is α, which satisfies 1 / 30≤α≤1 / 25.

[0039] In one embodiment, see Figure 3 and Figure 4The screw body 1 also has a fixing section 13, the fixing section 13, the pedicle thread section 12 and the vertebral body thread section 11 are connected in sequence, the fixing section 13 is provided with a mounting groove 13a, the inner wall of the mounting groove 13a is provided with an internal thread 13d, and has avoidance openings 13c located on both sides of the radial direction of the fixing section 13, and has a mounting opening 13b located on the side of the fixing section 13 away from the pedicle thread section 12; the pedicle screw also includes a tightening screw 2, which can be screwed into the mounting groove 13a from the mounting opening 13b, and is used to tighten the connecting rod extending into the mounting groove 13a from the avoidance opening 13c.

[0040] In this embodiment, a fixing section 13 is also provided, and a U-shaped mounting groove 13a is provided at the end of the fixing section 13 away from the pedicle threaded section 12, so that the connecting rod can extend into the mounting groove 13a from the avoidance opening 13c, and then the connecting rod can be pressed into the mounting groove 13a by tightening the top screw 2, thereby improving the installation convenience and stability of the pedicle screw and the connecting rod.

[0041] It should be noted that the fixing section 13 may have, partially have or not have an external thread design.

[0042] In one embodiment, the outer wall of the fixing section 13 is provided with an external thread, and the outer diameter of the fixing section 13 is not less than the outer diameter of the pedicle threaded section 12 .

[0043] In this embodiment, the fixing section 13 is also provided with an external thread, that is, the screw body 1 adopts a full-thread design, so that the fixing section 13 of the screw tail can also be fully implanted in the pedicle 4, bridging and fixing the vertebral body 3 and the pedicle 4. In addition, the implantation depth of the fixing section 13 of the screw tail can be adjusted as needed, facilitating the implantation, connection, and fixation of the connecting rod and reducing irritation to soft tissue.

[0044] Specifically, in this embodiment, the pitch of the fixation segment 13 is greater than the pitch of the pedicle thread segment 12, and its pitch gradually increases in the direction away from the pedicle thread segment 12. In addition, the fixation segment 13 has a gradually expanding segment and a straight segment. The straight segment, the gradually expanding segment, the pedicle thread segment 12, and the vertebral body thread segment 11 are sequentially connected, and the outer diameter of the gradually expanding segment gradually increases in the direction away from the pedicle thread segment 12.

[0045] In one embodiment, the pressing screw 2 is provided with a limiting hole 2a along its axial direction. The cross section of the limiting hole 2a is polygonal and at least one end is open.

[0046] In this embodiment, a polygonal limiting hole 2a is provided in the compression screw 2 to facilitate rotation of the compression screw 2 by an internal angle wrench that fits against the inner wall of the limiting hole 2a, thereby improving the installation convenience of the compression screw 2. Specifically, in this embodiment, the cross-section of the limiting hole 2a is hexagonal.

[0047] In one embodiment, the internal thread 13d is spaced apart from the bottom wall of the mounting groove 13a.

[0048] In this embodiment, the internal thread 13d of the inner wall of the installation groove 13a does not extend to the bottom of the groove. While satisfying the requirement of tightening the top screw 2 to tighten the connecting rod, the integrity of the inner wall of the installation groove 13a is improved as much as possible, thereby improving the connection strength of the fixing section 13.

[0049] Specifically, in one embodiment, the fixing segment 13 has a height of 14 mm and a diameter of 8 to 10 mm. The mounting groove 13a has a depth of 12 mm and a width of 5 to 6 mm. The internal thread 13d of the mounting groove 13a has a depth of 4 to 5 mm. Furthermore, in this embodiment, the fixing segment 13, the pedicle threaded segment 12, and the vertebral body threaded segment 11 are integrated, enhancing the strength of the connection between them.

[0050] In addition, the present invention further provides a pedicle screw fixation system comprising any one of the above-described pedicle screws. It should be noted that the detailed structure of the pedicle screws in the pedicle screw fixation system can be referred to in the above-described embodiments of the pedicle screws, and will not be described in detail here. Since the above-described pedicle screws are used in the pedicle screw fixation system of the present invention, the embodiments of the pedicle screw fixation system of the present invention include all technical solutions of all the above-described embodiments of the pedicle screws, and the technical effects achieved are also identical, and will not be described in detail here.

[0051] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail: In this scheme: after the screw channel 4a of the pedicle 4 screw is prepared, the C-arm fluoroscopy is used to confirm that the screw channel 4a is in a good position, and then after the pedicle 4 is osteotomized, the pedicle screw is implanted, which can move the pedicle 4, lamina spinous process and other tissues behind the osteotomy backward and fix them as a whole.

[0052] Specifically, the screw body 1 of the pedicle screw includes three parts: ① vertebral thread segment 11, which is the part inside the vertebral body 3 after implantation. The tip of the vertebral thread segment 11 is the tip of the pedicle screw that opens a path in the pedicle 4 and the cancellous bone of the vertebral body 3; ② pedicle thread segment 12, which is the part inside the pedicle 4 after implantation. The pedicle thread segment 12 is formed integrally with the vertebral thread segment 11 and is at the rear end of the vertebral thread segment 11. The pitch of the external thread of the pedicle thread segment 12 is The pitch of the external thread of the vertebral thread segment 11 is wider, the thread pitch of the vertebral thread segment 11 is 1 to 2 mm, and the thread pitch of the pedicle thread segment 12 is 2 to 3 mm. As a whole, the pitch of the external thread of the screw body 1 gradually widens from front to back; ③ The nail tail part, that is, the fixing section 13, the rear end of the pedicle thread segment 12, is provided with a U-shaped mounting groove 13a, and an internal thread 13d is provided in the U-shaped mounting groove 13a to facilitate the connection and fixation of the connecting rod and the screw body 1.

[0053] The vertebral body thread segment 11, pedicle thread segment 12 and nail tail portion all have a certain taper of 1:30 to 1:25. The taper of the pedicle thread segment 12 matches the anatomical structure of the pedicle 4 and adapts to the bone density gradient of the pedicle 4, making it more stable after implantation.

[0054] This patented pedicle screw has the following advantages: The patented pedicle screw has a certain taper that matches the anatomical structure of the pedicle 4 and adapts to the bone density gradient of the pedicle 4, resulting in better stability after implantation. Furthermore, the screw body 1 is a fully threaded design, with the pitch gradually increasing from the vertebral body thread segment 11 to the pedicle thread segment 12. After implantation, this design allows the entire posterior structure of the spinal canal to shift posteriorly, achieving the purpose of decompression and fixation.

[0055] In addition, the screw body 1 is a fully threaded design, and the tail portion of the screw can also be completely implanted in the pedicle 4, bridging and fixing the vertebral body 3 and the pedicle 4. The depth of the tail portion of the pedicle screw can also be adjusted after implantation, which is beneficial for the implantation, connection and fixation of the connecting rod and reduces soft tissue irritation.

[0056] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A pedicle screw for connecting a vertebral body and a pedicle after being cut off, characterized in that: The screw body comprises a screw body having a connected vertebral thread segment and a pedicle thread segment, wherein the outer diameter of the vertebral thread segment is not larger than the outer diameter of the pedicle thread segment, and the screw pitch thereof is smaller than the screw pitch of the pedicle thread segment; The vertebral body threaded section is used to pass through the pedicle and be rotated and implanted into the vertebral body, and when extending into the vertebral body, it can pull the pedicle threaded section to be rotated and implanted into the pedicle.

2. The pedicle screw according to claim 1, characterized in that The pitch of the pedicle thread segment gradually increases in a direction away from the vertebral body thread segment; and / or, The pitch of the vertebral body thread segment gradually increases in a direction approaching the pedicle thread segment.

3. The pedicle screw according to claim 1 or 2, characterized in that: The pitch of the vertebral thread segment is d1, which satisfies 1 mm ≤ d1 ≤ 2 mm; The pitch of the pedicle thread segment is d2, which satisfies 2 mm ≤ d2 ≤ 3 mm.

4. The pedicle screw according to claim 1, characterized in that The end of the vertebral thread segment away from the pedicle thread segment is a screw-in end, and the end of the pedicle thread segment away from the vertebral thread segment is a connecting end; The outer diameter of the screw body gradually increases from the screw-in end to the connecting end and is tapered.

5. The pedicle screw according to claim 4, characterized in that The taper of the screw body is α, which satisfies 1 / 30≤α≤1 / 25.

6. The pedicle screw according to claim 1, wherein The screw body further comprises a fixing section, wherein the fixing section, the pedicle thread section and the vertebral body thread section are connected in sequence, the fixing section is provided with a mounting groove, the inner wall of the mounting groove is provided with an internal thread, and has avoidance openings located on both sides of the fixing section in the radial direction, and has a mounting opening located on the side of the fixing section away from the pedicle thread section; The pedicle screw further comprises a compression screw, which can be screwed into the mounting groove from the mounting opening and is used for compressing the connecting rod extending from the avoidance opening into the mounting groove.

7. The pedicle screw according to claim 6, characterized in that The outer wall of the fixing section is provided with an external thread, and the outer diameter of the fixing section is not less than the outer diameter of the pedicle thread section.

8. The pedicle screw according to claim 6, characterized in that The pressing screw is provided with a limiting hole along its axial direction. The cross section of the limiting hole is polygonal and at least one end is open.

9. The pedicle screw according to claim 1, characterized in that The pedicle thread segment and the vertebral body thread segment are integrally arranged.

10. A pedicle fixation system, characterized in that: Comprising the pedicle screw according to any one of claims 1 to 9.

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