A pedicle screw and a pedicle screw assembly

Abstract

The utility model provides a kind of pedicle screw and pedicle screw assembly, comprising: screw head, screw rod and tip, screw head, screw rod and tip are sequentially connected along the axial direction of pedicle screw, the outer circumferential surface of screw rod is provided with thread, tip is located on the one end of screw rod away from screw head, tip is provided with cutting tooth, cutting tooth is formed with reverse blade edge;Wherein, the cutting direction of reverse blade edge is opposite with the spiral direction of thread, to make pedicle screw rotate in the direction opposite with the spiral direction of thread by reverse blade edge cutting bone tissue when.The pedicle screw in the utility model, solve the technical problem that pedicle screw in relevant technology cannot produce cutting effect when reverse rotating.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a pedicle screw and a pedicle screw assembly. Background Technology

[0002] In spinal surgery, pedicle screws are widely used as implants in spinal procedures. Depending on the surgical method, screws are mainly divided into open screws and minimally invasive screws. Open screws primarily use short-tailed and solid screws, while minimally invasive screws primarily use hollow and long-tailed screws. Currently, pedicle screws have different designs depending on the specific indication. With the popularization of robotic procedures and navigation technology, the design of pedicle screws is constantly evolving to better adapt to robotic systems and navigation tools, making implantation and visualization easier.

[0003] Pedicle screws can be solid or hollow, and their heads may contain several cutting features. Solid screws usually require pre-drilled holes for insertion, while hollow screws typically require a Kirschner wire for guidance before being driven in. However, regardless of whether the screw is solid or hollow, when it is right-handed, it is used for clockwise rotation. Counterclockwise rotation does not produce a cutting action. When pedicle screws are used with robots, if the robot arm drives the screw to rotate in the opposite direction (counterclockwise), the pedicle screw will slip, affecting the screw's positioning.

[0004] In addition, most split screws have a Torx or hexagonal design for the holder and screw interface, which often has a certain gap fit. This results in poor coaxiality between the holder and screw axis, further affecting the accuracy and stability of the surgical operation.

[0005] In summary, existing pedicle screws cannot be better adapted to robotic systems and navigation tools, and cannot meet the requirements of various surgical procedures.

[0006] Therefore, existing technologies need further development. Utility Model Content

[0007] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a pedicle screw and a pedicle screw assembly to solve the technical problem that the pedicle screw cannot produce a cutting action when rotated in the reverse direction in the related art.

[0008] To achieve the above technical objectives, the present invention adopts the following technical solution: a pedicle screw is provided, comprising: a screw head, a screw shank, and a tip. The screw head, screw shank, and tip are connected sequentially along the axial direction of the pedicle screw. A thread is provided on the outer circumferential surface of the screw shank. The tip is located at the end of the screw shank away from the screw head and is provided with cutting teeth. The cutting teeth form a reverse cutting edge. The cutting direction of the reverse cutting edge is opposite to the helical direction of the thread, so that when the pedicle screw rotates in a direction opposite to the helical direction of the thread, it cuts bone tissue through the reverse cutting edge.

[0009] Furthermore, the cutting tooth includes: a first cutting surface and a second cutting surface connected in sequence, the first cutting surface and the second cutting surface intersecting at the end of the cutting tooth away from the screw head; a cutting side surface, the cutting side surface being located on the outer periphery of the cutting tooth, the cutting side surface being connected to the radial outer side of the first cutting surface and the second cutting surface respectively, and the intersection of the cutting side surface and the first cutting surface forming a reverse cutting edge.

[0010] Furthermore, the tip has a spherical structure, and the cutting teeth include multiple teeth that are circumferentially distributed around the axis of the tip, with the cutting side formed on the outer spherical surface of the tip.

[0011] Furthermore, the cutting tooth includes: a first cutting surface and a second cutting surface, the first cutting surface and the second cutting surface being disposed opposite to each other; a cutting side surface, the cutting side surface being located on the outer periphery of the cutting tooth, the cutting side surface being connected to the radial outer side of the first cutting surface and the second cutting surface respectively, and the intersection of the cutting side surface and the first cutting surface forming a reverse cutting edge.

[0012] Furthermore, the cutting teeth include at least two, and a cutting groove is formed between two adjacent cutting teeth. The cutting groove includes a cutting groove surface, and the two sides of the cutting groove surface are respectively connected to the two adjacent cutting teeth. The cutting groove surface is an arc-shaped surface.

[0013] Furthermore, the cutting tooth includes: a first cutting surface, an end face, and a second cutting surface connected in sequence, the second cutting surface being disposed opposite to the first cutting surface; and a cutting side surface located on the outer periphery of the cutting tooth, the cutting side surface being connected to the radial outer sides of the first cutting surface and the second cutting surface respectively, and the intersection of the cutting side surface and the first cutting surface forming a reverse cutting edge.

[0014] Furthermore, a positive cutting edge is formed at the intersection of the second cutting surface and the cutting side surface, and the cutting direction of the positive cutting edge is opposite to the cutting direction of the reverse cutting edge.

[0015] Furthermore, the intersection of the second cutting surface and the cutting side surface forms the first positive cutting edge, and the intersection of the end face and the cutting side surface forms the second positive cutting edge. The cutting directions of the first positive cutting edge and the second positive cutting edge are opposite to the cutting direction of the reverse cutting edge.

[0016] Furthermore, the cutting teeth extend in a spiral shape along the thread line, and the side of the cutting teeth away from the first positive cutting edge connects with the threaded blade of the screw shank.

[0017] Furthermore, the cutting teeth include multiple teeth, which are arranged sequentially along the circumference of the screw shank.

[0018] Furthermore, the cutting teeth include two teeth, which are arranged sequentially along the circumference of the screw rod.

[0019] Furthermore, the pedicle screw includes a groove formed on the thread crest surface of the screw shank, the groove extending along the axial direction of the screw shank, or the extension direction of the groove being set at a predetermined angle with the axial direction of the screw shank; wherein, the groove includes multiple grooves, and the multiple grooves are spaced apart along the thread line on the thread crest surface.

[0020] Furthermore, the pedicle screw includes a groove formed on the thread crest surface of the screw shank, the groove extending along the axial direction of the screw shank, or the extension direction of the groove being provided at a predetermined angle with the axial direction of the screw shank; wherein the groove includes at least one, and at least one groove is distributed along the circumference of the screw shank.

[0021] Furthermore, a connecting groove extending along the axial direction of the screw shank is provided in the screw head, and a positioning surface is provided at one end of the connecting groove near the screw shank or at the other end away from the screw shank. A preset angle is provided between the extending direction of the positioning surface and the axial direction of the screw shank.

[0022] Furthermore, a connecting groove is provided in the screw head, extending axially along the screw shank. The cross-section of the connecting groove is square, which is used to prevent the pedicle screw from rotating.

[0023] A pedicle screw assembly includes: the aforementioned pedicle screw; a mounting base containing the screw head of the pedicle screw; and a pressure ring mounted inside the mounting base, the pressure ring having an inner concave surface that is spherical and mates with the spherical outer wall of the screw head.

[0024] Beneficial effects:

[0025] 1. In the pedicle screw of this embodiment, the tip has a reverse cutting edge. The cutting direction of the reverse cutting edge is opposite to the helical direction of the thread. For example, when the screw shank is designed as a right-hand thread, the helical direction of the thread is right-hand (clockwise tightening). When the pedicle screw is rotated clockwise, the screw can quickly bite into the bone. The cutting direction of the reverse cutting edge is counterclockwise, so that the pedicle screw can also have a cutting function when rotated counterclockwise. When the pedicle screw of this embodiment is applied in robotic surgery, it can be used in conjunction with the robot when it is necessary to remove the pedicle screw or adjust its position. By rotating counterclockwise, the reverse cutting edge actively cuts the bone tissue. The pedicle screw can act like a drill bit, cutting to form an anti-slip pit, which has an anti-slip effect on the pedicle screw and Kirschner wire, thereby improving the screw placement accuracy and solving the technical problem in related technologies that the pedicle screw cannot produce a cutting effect when rotated counterclockwise.

[0026] 2. The pedicle screw and pedicle screw assembly in this embodiment can be efficiently and accurately implanted into bone tissue through the operation of the corresponding instruments. They are not only suitable for traditional open or minimally invasive surgery, but also especially suitable for robot-assisted surgical systems.

[0027] 3. By setting inclined positioning surfaces or sidewalls, when installing components such as pressure rings, axial pressure can be converted into radial locking force to achieve centering and clamping, ensuring the coaxiality between the instrument and the pedicle screw, achieving precise docking between the tool and the screw, and improving the navigation accuracy in the robot system. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the pedicle screw assembly used in an embodiment of this utility model;

[0029] Figure 2 This is a schematic diagram of the cutting teeth of the pedicle screw used in the first embodiment of this utility model;

[0030] Figure 3 yes Figure 2 Enlarged view of point A in the image;

[0031] Figure 4 This is a schematic diagram of the cutting teeth of the pedicle screw used in the second embodiment of this utility model;

[0032] Figure 5 This is a schematic diagram of the cutting teeth of the pedicle screw used in the third embodiment of this utility model;

[0033] Figure 6 This is a schematic diagram of the cutting teeth of the pedicle screw used in the fourth embodiment of this utility model from the first perspective.

[0034] Figure 7This is a structural schematic diagram from the second perspective of the cutting teeth of the pedicle screw used in the fourth embodiment of this utility model;

[0035] Figure 8 This is a schematic diagram of the cutting teeth of the pedicle screw used in the fifth embodiment of this utility model;

[0036] Figure 9 This is a schematic diagram of the cutting teeth of the pedicle screw used in the sixth embodiment of this utility model;

[0037] Figure 10 This is a schematic diagram of the cutting teeth of the pedicle screw used in the seventh embodiment of this utility model;

[0038] Figure 11 This is a schematic diagram of the cutting teeth of the pedicle screw used in the eighth embodiment of this utility model;

[0039] Figure 12 This is a schematic diagram of the groove structure of the pedicle screw used in the ninth embodiment of this utility model;

[0040] Figure 13 This is a schematic diagram of the structure of the tapered screw rod of the pedicle screw used in this embodiment of the utility model;

[0041] Figure 14 This is a schematic diagram of the connecting groove of the pedicle screw used in the eleventh embodiment of this utility model;

[0042] Figure 15 This is a schematic diagram of the connecting groove of the pedicle screw used in the twelfth embodiment of this utility model;

[0043] Figure 16 This is a schematic diagram of the friction groove of the pedicle screw used in the thirteenth embodiment of this utility model;

[0044] Figure 17 This is a schematic diagram of the installation structure of the pedicle screw used in an embodiment of this utility model;

[0045] Figure 18 This is a schematic diagram of the pressure ring structure of the pedicle screw assembly used in this embodiment of the utility model.

[0046] The above figures include the following reference numerals:

[0047] 10. Screw head; 20. Screw shank; 30. Tip; 40. Mounting base; 50. Pressure ring;

[0048] 1. Cutting tooth; 11. First cutting surface; 12. Second cutting surface; 13. Cutting side surface; 14. End face; 2. Reverse cutting edge; 3. Cutting groove; 31. Cutting groove surface; 4. Positive cutting edge; 41. First positive cutting edge; 42. Second positive cutting edge; 5. Groove; 51. Concave surface; 6. Connecting groove; 61. Positioning surface; 62. Side wall; 7. Chip removal groove. Detailed Implementation

[0049] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0050] As described in the background section, most screws used in daily life are right-handed. When rotated clockwise (turned to the right), the screw is tightened, and when rotated counterclockwise (turned to the left), it is loosened. Right-handed pedicle screws can quickly engage with bone when rotated clockwise, allowing the screw to be quickly implanted into the pedicle. However, existing pedicle screws do not have the function of counterclockwise cutting, that is, they do not have the function of reverse cutting. For example, in robotic procedures, when the robotic arm drives the screw to rotate in the opposite direction (counterclockwise), it will cause the pedicle screw to slip, thereby affecting the positioning effect of the pedicle screw.

[0051] According to an embodiment of this utility model, a pedicle screw is provided. Please refer to [link / reference]. Figures 1 to 18 The screw includes a screw head 10, a screw shank 20, and a tip 30. The screw head 10, screw shank 20, and tip 30 are connected sequentially along the axial direction of the pedicle screw. The outer circumferential surface of the screw shank 20 is provided with threads. The tip 30 is located at the end of the screw shank 20 away from the screw head 10. The tip 30 is provided with cutting teeth 1, and the cutting teeth 1 form a reverse cutting edge 2. The cutting direction of the reverse cutting edge 2 is opposite to the helical direction of the thread, so that when the pedicle screw rotates in a direction opposite to the helical direction of the thread, it cuts bone tissue through the reverse cutting edge 2.

[0052] In the pedicle screw of this embodiment, the tip 30 has a reverse cutting edge 2. The cutting direction of the reverse cutting edge 2 is opposite to the helical direction of the thread. For example, when the screw shank 20 is designed to be right-handed, the helical direction of the thread is right-handed (clockwise tightening). When the pedicle screw is rotated clockwise, the screw can quickly bite into the bone. Then the cutting direction of the reverse cutting edge 2 is counterclockwise, so that the pedicle screw can also have a cutting function when rotated counterclockwise. When the pedicle screw of this embodiment is applied in robotic surgery, it can be used in conjunction with the robot when it is necessary to remove the pedicle screw or adjust its position. By rotating counterclockwise, the reverse cutting edge 2 actively cuts the bone tissue. The pedicle screw can act like a drill bit, cutting to form an anti-slip pit, which has an anti-slip effect on the pedicle screw and Kirschner wire, thereby improving the screw placement accuracy and solving the technical problem in related technologies that the pedicle screw cannot produce a cutting effect when rotated counterclockwise.

[0053] In some embodiments, when the screw rod 20 is designed to be left-handed, the helical direction of the thread is left-handed (tightening counterclockwise). When the pedicle screw is rotated counterclockwise, the screw can quickly bite into the bone. Then the cutting direction of the reverse cutting edge 2 is clockwise, so that the pedicle screw can also have a cutting function when rotated clockwise. In robotic surgery, when it is necessary to remove the pedicle screw or adjust its position, it can be used in conjunction with the robot to actively cut bone tissue by rotating clockwise using the reverse cutting edge 2.

[0054] In the pedicle screw of this embodiment, the cutting teeth 1 also have a forward cutting edge 4, and the cutting direction of the forward cutting edge 4 is the same as the helical direction of the thread. For example, when the screw shank 20 is designed to be right-handed, the helical direction of the thread of the screw shank 20 is right-handed (clockwise tightening), then the cutting direction of the forward cutting edge 4 is clockwise. When the pedicle screw is rotated clockwise, the forward cutting edge 4 can make the screw quickly bite into the bone.

[0055] In the pedicle screw of this embodiment, see Figure 1 The cutting teeth 1 include at least two, and a cutting groove 3 is formed between two adjacent cutting teeth 1. The cutting teeth 1 can be formed by setting the cutting groove 3, and it also has a chip-collecting function to collect and discharge bone chips generated during the cutting process, preventing bone chip accumulation from causing a decrease in cutting efficiency or blockage, so as to reduce the resistance of bone tissue material on the pedicle screw.

[0056] In some embodiments, see Figure 13 The outer circumferential surface of the screw rod 20 near the tip 30 is provided with a taper B, the value of which is 5-15°.

[0057] In the embodiments of this application, the spiral direction of the thread is right-handed (clockwise tightening), and the cutting direction of the reverse cutting edge 2 is counterclockwise cutting, which is not considered as a limitation on the scope of protection.

[0058] Example 1

[0059] In the pedicle screw of this embodiment, see Figure 2-3 The cutting tooth 1 includes: a first cutting surface 11 and a second cutting surface 12 connected in sequence, the first cutting surface 11 and the second cutting surface 12 intersecting at the end of the cutting tooth 1 away from the screw head 10; and a cutting side surface 13 located on the outer periphery of the cutting tooth 1, the cutting side surface 13 being connected to the radially outer sides of the first cutting surface 11 and the second cutting surface 12 respectively, the intersection of the cutting side surface 13 and the first cutting surface 11 forming a reverse cutting edge 2. With the above configuration, by actively cutting bone tissue using the reverse cutting edge 2 through counterclockwise rotation, it is ensured that the cutting tooth 1 can effectively remove bone tissue when the pedicle screw rotates in the reverse direction.

[0060] In the pedicle screw of this embodiment, see Figure 2-3 The intersection of the second cutting surface 12 and the cutting side surface 13 forms a forward cutting edge 4, and the cutting direction of the forward cutting edge 4 is opposite to that of the reverse cutting edge 2. By setting the forward cutting edge 4, when the pedicle screw is rotated clockwise for placement, the forward cutting edge 4 has a certain cutting ability and can quickly cut bone tissue.

[0061] In the pedicle screw of this embodiment, see Figure 2-3 The cutting teeth 1 include multiple cutting teeth 1 arranged sequentially along the circumference of the screw rod 20.

[0062] Specifically, in this embodiment, the multiple cutting teeth 1 form an annular sawtooth structure. The first cutting surface 11 and the second cutting surface 12 intersect at the end of the cutting tooth 1 away from the screw head 10. The shape of each cutting tooth 1 is approximately triangular. By adjusting the included angle between the first cutting surface 11 and the second cutting surface 12 or by adjusting the shape of the first cutting surface 11 and the second cutting surface 12, the cutting teeth 1 in this embodiment can have different structural forms to adapt to different cutting requirements.

[0063] Optionally, the pedicle screw in this embodiment is a hollow screw with a hollow structure to accommodate Kirschner wires.

[0064] It should be noted that the pedicle screw in this embodiment can also be a solid screw. Of course, in other embodiments of this application, the type of pedicle screw is not limited, and the pedicle screw can be selected as a solid screw or a hollow screw as needed.

[0065] It should be noted that, not only in this embodiment, but also in other embodiments of this application, the cutting side surface 13 can be set as any one of the following types: cylindrical surface, conical surface, inclined plane, curved surface, etc.

[0066] Optionally, see Figure 2-3 The cutting side 13 is a cylindrical surface.

[0067] In the pedicle screw of this embodiment, the number of threads is not limited. The threads can be double-threaded, triple-threaded, or multi-threaded. The entire screw shaft 20 can also be divided into at least two segments, each with a different number of threads. For example, the entire screw shaft 20 can be divided into two segments, with a double-threaded segment near the tip 30 and a multi-threaded segment away from the tip 30. Of course, in other embodiments of this application, the number of threads is not limited.

[0068] Optionally, the outer peripheral surface of the screw rod 20 near the tip 30 is provided with a taper B, the value of which is in the range of 5-15°.

[0069] Example 2

[0070] In the pedicle screw of this embodiment, see Figure 4 The cutting tooth 1 includes: a first cutting surface 11 and a second cutting surface 12 connected in sequence, the first cutting surface 11 and the second cutting surface 12 intersecting at the end of the cutting tooth 1 away from the screw head 10; and a cutting side surface 13 located on the outer periphery of the cutting tooth 1, the cutting side surface 13 being connected to the radially outer sides of the first cutting surface 11 and the second cutting surface 12 respectively, the intersection of the cutting side surface 13 and the first cutting surface 11 forming a reverse cutting edge 2. With the above configuration, by actively cutting bone tissue using the reverse cutting edge 2 through counterclockwise rotation, it is ensured that the cutting tooth 1 can effectively remove bone tissue when the pedicle screw rotates in the reverse direction.

[0071] In the pedicle screw of this embodiment, see Figure 4 The tip 30 has a spherical structure, and the cutting teeth 1 include multiple teeth. The multiple cutting teeth 1 are circumferentially distributed around the axis of the tip 30, and the cutting side surface 13 is formed on the outer spherical surface of the tip 30.

[0072] In the pedicle screw of this embodiment, see Figure 4 The intersection of the second cutting surface 12 and the cutting side surface 13 forms a forward cutting edge 4, and the cutting direction of the forward cutting edge 4 is opposite to that of the reverse cutting edge 2. By setting the forward cutting edge 4, when the pedicle screw is rotated clockwise for placement, the forward cutting edge 4 has a certain cutting ability and can quickly cut bone tissue.

[0073] Specifically, in this embodiment, the multiple cutting teeth 1 form an annular sawtooth structure. The first cutting surface 11 and the second cutting surface 12 intersect at the end of the cutting tooth 1 away from the screw head 10. By adjusting the included angle between the first cutting surface 11 and the second cutting surface 12 or by adjusting the shape of the first cutting surface 11 and the second cutting surface 12, the cutting teeth 1 in this embodiment can have different structural forms to adapt to different cutting requirements.

[0074] Optionally, the pedicle screw in this embodiment is a solid screw with a protruding end blade at the end of the tip 30. The end blade is cone-shaped to cut into the bone to form a hole without the use of Kirschner wires.

[0075] Example 3

[0076] In the pedicle screw of this embodiment, see Figure 5 The cutting tooth 1 includes: a first cutting surface 11 and a second cutting surface 12, which are arranged opposite to each other; and a cutting side surface 13, which is located on the outer periphery of the cutting tooth 1 and is connected to the radially outer sides of the first cutting surface 11 and the second cutting surface 12 respectively. The intersection of the cutting side surface 13 and the first cutting surface 11 forms a reverse cutting edge 2. With the above arrangement, the cutting tooth 1 can effectively remove bone tissue by actively cutting bone tissue using the reverse cutting edge 2 through counterclockwise rotation, ensuring that the cutting tooth 1 can effectively remove bone tissue when the pedicle screw rotates in the opposite direction.

[0077] In the pedicle screw of this embodiment, the end of the cutting tooth 1 is formed with an annular end edge, which can be used to cut into the cortical bone and promote the engagement of the pedicle screw with the bone.

[0078] Optionally, see Figure 5 The cutting teeth 1 include at least two, and a cutting groove 3 is formed between two adjacent cutting teeth 1. The cutting groove 3 includes a cutting groove surface 31, and the two sides of the cutting groove surface 31 are respectively connected to the two adjacent cutting teeth 1. The cutting groove surface 31 is an arc-shaped surface. By setting the cutting groove surface 31, cutting teeth 1 are formed on the screw rod 20.

[0079] Preferably, the cutting groove surface 31 is arc-shaped, and a preset angle is provided between the extending direction of the cutting groove surface 31 and the extending direction of the screw shank 20, so that the tip 30 gradually tapers away from the screw head 10, which is more conducive to the tip 30 cutting into the grinding features and easily engaging with the bone. In the pedicle screw of this embodiment, see Figure 5 The intersection of the second cutting surface 12 and the cutting side surface 13 forms a positive cutting edge 4, and the cutting direction of the positive cutting edge 4 is opposite to that of the reverse cutting edge 2. By setting the positive cutting edge 4, when the pedicle screw is rotated clockwise, the positive cutting edge 4 can make the screw quickly bite into the bone.

[0080] Optionally, see Figure 5 The cutting teeth 1 include two teeth, which are arranged sequentially along the circumference of the screw rod 20.

[0081] Preferably, when there are two cutting teeth 1, the two cutting teeth 1 are arranged opposite to each other.

[0082] Optionally, the pedicle screw in this embodiment is a hollow screw with a hollow structure to accommodate Kirschner wires.

[0083] Optionally, see Figure 5 The cutting side 13 is a conical surface or an inclined plane.

[0084] Optionally, the outer peripheral surface of the screw rod 20 near the tip 30 is provided with a taper B, the value of which is in the range of 5-15°.

[0085] Example 4

[0086] In the pedicle screw of this embodiment, see Figure 6-7 The cutting tooth 1 includes: a first cutting surface 11, an end face 14, and a second cutting surface 12 connected in sequence, with the second cutting surface 12 opposite to the first cutting surface 11; and a cutting side surface 13 located on the outer periphery of the cutting tooth 1, which is connected radially to the outer sides of the first cutting surface 11 and the second cutting surface 12, respectively. A reverse cutting edge 2 is formed at the intersection of the cutting side surface 13 and the first cutting surface 11. Through this configuration, the reverse cutting edge 2 actively cuts bone tissue by counterclockwise rotation, ensuring that the cutting tooth 1 effectively removes bone tissue when the pedicle screw rotates in the reverse direction.

[0087] In the pedicle screw of this embodiment, see Figure 6-7 The intersection of the second cutting surface 12 and the cutting side surface 13 forms the first positive cutting edge 41, and the intersection of the end face 14 and the cutting side surface 13 forms the second positive cutting edge 42. The cutting directions of the first positive cutting edge 41 and the second positive cutting edge 42 are opposite to the cutting direction of the reverse cutting edge 2. By setting the first positive cutting edge 41 and the second positive cutting edge 42, when the pedicle screw is rotated clockwise, the positive cutting edge 42 allows the screw to quickly engage with the bone.

[0088] Specifically, the end face 14 is an annular surface distributed circumferentially along the screw rod 20. The end face 14 forms an end blade with the first cutting surface 11, the second cutting surface 12 and the cutting side surface 13, which is used to cut into the cortical bone and facilitate easy engagement between the tip 30 and the bone.

[0089] Optionally, a preset angle is provided between the end face 14 and the extension direction of the screw rod 20, and the end of the end face 14 near the first cutting surface 11 is inclined away from the screw head 10.

[0090] In the pedicle screw of this embodiment, see Figure 6-7 The cutting tooth 1 extends spirally along the thread line of the screw thread, and the side of the cutting tooth 1 away from the first positive cutting edge 41 is connected to the threaded blade of the screw shank 20. Through the above arrangement, the positive cutting edge and the thread feature are continuous, allowing the cutting feature to continuously cut into the bone. When the pedicle screw is screwed into the bone tissue, an axial force is generated to push the thread forward into the bone, so that the thread can easily engage with the bone.

[0091] Optionally, the cutting teeth 1 and the threaded blades of the screw rod 20 are provided with chip removal grooves 7, which breaks a small section of the continuous feature between the cutting teeth 1 and the threaded blades of the screw rod 20. On the one hand, by providing chip removal grooves 7, a first positive cutting edge 41 and a second positive cutting edge 42 can be formed on the cutting teeth 1; on the other hand, it can serve as a chip removal channel to help remove the chips generated during the cutting process and prevent the accumulation of chips from causing thread blockage or affecting the insertion of the screw.

[0092] Optionally, see Figure 6-7 The cutting teeth 1 include two teeth, which are arranged sequentially along the circumference of the screw rod 20.

[0093] Preferably, when there are two cutting teeth 1, the two cutting teeth 1 are arranged opposite to each other.

[0094] Optionally, the pedicle screw in this embodiment is a hollow screw with a hollow structure to accommodate Kirschner wires.

[0095] Optionally, see Figure 6-7 The cutting side 13 is a conical surface.

[0096] Optionally, the outer peripheral surface of the screw rod 20 near the tip 30 is provided with a taper B, the value of which is in the range of 5-15°.

[0097] Example 5

[0098] In the pedicle screw of this embodiment, see Figure 8 The cutting tooth 1 includes: a first cutting surface 11, an end face 14, and a second cutting surface 12 connected in sequence, with the second cutting surface 12 opposite to the first cutting surface 11; and a cutting side surface 13 located on the outer periphery of the cutting tooth 1, which is connected radially to the outer sides of the first cutting surface 11 and the second cutting surface 12, respectively. A reverse cutting edge 2 is formed at the intersection of the cutting side surface 13 and the first cutting surface 11. Through this configuration, the reverse cutting edge 2 actively cuts bone tissue by counterclockwise rotation, ensuring that the cutting tooth 1 effectively removes bone tissue when the pedicle screw rotates in the reverse direction.

[0099] In the pedicle screw of this embodiment, see Figure 8The intersection of the second cutting surface 12 and the cutting side surface 13 forms a positive cutting edge 4, and the cutting direction of the positive cutting edge 4 is opposite to that of the reverse cutting edge 2. By setting the positive cutting edge 4, when the pedicle screw is rotated clockwise, the positive cutting edge 4 can make the screw quickly bite into the bone.

[0100] Optionally, a preset angle is provided between the end face 14 and the extension direction of the screw rod 20, and the end of the end face 14 near the first cutting surface 11 is inclined away from the screw head 10.

[0101] Specifically, the end face 14 is an annular surface distributed circumferentially along the screw shank 20. The end face 14 forms an end cutting edge with the first cutting surface 11, the second cutting surface 12, and the cutting side surface 13, which is used to cut into the cortical bone and facilitate easy engagement between the tip 30 and the bone. By adjusting the length ratio or tilt angle of the end face 14, the cutting teeth 1 in the embodiment can have different structural shapes to adapt to different cutting needs or the outer diameter of the screw shank 20.

[0102] For example, comparing the cutting tooth 1 in Example 5 with the cutting tooth 1 in Example 4, the length ratio of the end face 14 of the cutting tooth 1 in Example 5 is larger. Therefore, when the outer diameter of the screw rod 20 is small, the cutting tooth 1 in Example 4 can be selected to make the cutting tooth 1 have higher strength.

[0103] Optionally, see Figure 8 The cutting teeth 1 include two teeth, which are arranged sequentially along the circumference of the screw rod 20.

[0104] Optionally, the pedicle screw in this embodiment is a hollow screw with a hollow structure to accommodate Kirschner wires.

[0105] Optionally, see Figure 8 The cutting side 13 is a cylindrical surface.

[0106] Example 6

[0107] In the pedicle screw of this embodiment, see Figure 9 The cutting tooth 1 includes: a first cutting surface 11, an end face 14, and a second cutting surface 12 connected in sequence, with the second cutting surface 12 opposite to the first cutting surface 11; and a cutting side surface 13 located on the outer periphery of the cutting tooth 1, which is connected radially to the outer sides of the first cutting surface 11 and the second cutting surface 12, respectively. A reverse cutting edge 2 is formed at the intersection of the cutting side surface 13 and the first cutting surface 11. Through this configuration, the reverse cutting edge 2 actively cuts bone tissue by counterclockwise rotation, ensuring that the cutting tooth 1 effectively removes bone tissue when the pedicle screw rotates in the reverse direction.

[0108] In the pedicle screw of this embodiment, see Figure 9The intersection of the second cutting surface 12 and the cutting side surface 13 forms a positive cutting edge 4, and the cutting direction of the positive cutting edge 4 is opposite to that of the reverse cutting edge 2. By setting the positive cutting edge 4, when the pedicle screw is rotated clockwise, the positive cutting edge 4 can make the screw quickly bite into the bone.

[0109] Optionally, a preset angle is provided between the end face 14 and the extension direction of the screw rod 20, and the end of the end face 14 near the first cutting surface 11 is inclined away from the screw head 10.

[0110] Specifically, the end face 14 is an annular surface distributed circumferentially along the screw shank 20. The end face 14 forms an end cutting edge with the first cutting surface 11, the second cutting surface 12, and the cutting side surface 13, which is used to cut into the cortical bone and facilitate easy engagement between the tip 30 and the bone. By adjusting the length ratio or tilt angle of the end face 14, the cutting tooth 1 can have different structural shapes to adapt to different cutting needs.

[0111] For example, comparing the cutting tooth 1 in Example 6 with the cutting tooth 1 in Example 5, the end face 14 of the cutting tooth 1 in Example 6 has a larger inclination angle, which allows it to cut into the bone more quickly compared to the cutting tooth 1 in Example 5.

[0112] Optionally, see Figure 9 The cutting teeth 1 include two teeth, which are arranged sequentially along the circumference of the screw rod 20.

[0113] Optionally, the pedicle screw in this embodiment is a hollow screw with a hollow structure to accommodate Kirschner wires.

[0114] Optionally, see Figure 9 The cutting side 13 is a cylindrical surface.

[0115] Example 7

[0116] In the pedicle screw of this embodiment, see Figure 10 The cutting tooth 1 includes: a first cutting surface 11, an end face 14, and a second cutting surface 12 connected in sequence, with the second cutting surface 12 opposite to the first cutting surface 11; and a cutting side surface 13 located on the outer periphery of the cutting tooth 1, which is connected radially to the outer sides of the first cutting surface 11 and the second cutting surface 12, respectively. A reverse cutting edge 2 is formed at the intersection of the cutting side surface 13 and the first cutting surface 11. Through this configuration, the reverse cutting edge 2 actively cuts bone tissue by counterclockwise rotation, ensuring that the cutting tooth 1 effectively removes bone tissue when the pedicle screw rotates in the reverse direction.

[0117] In the pedicle screw of this embodiment, see Figure 10The intersection of the second cutting surface 12 and the cutting side surface 13 forms a positive cutting edge 4, and the cutting direction of the positive cutting edge 4 is opposite to that of the reverse cutting edge 2. By setting the positive cutting edge 4, when the pedicle screw is rotated clockwise, the positive cutting edge 4 can make the screw quickly bite into the bone.

[0118] Optionally, a preset angle is provided between the end face 14 and the extension direction of the screw rod 20, and the end of the end face 14 near the first cutting surface 11 is inclined away from the screw head 10.

[0119] Specifically, the end face 14 is an annular surface distributed circumferentially along the screw shank 20. The end face 14 forms an end cutting edge with the first cutting surface 11, the second cutting surface 12, and the cutting side surface 13, which is used to cut into the cortical bone and facilitate easy engagement between the tip 30 and the bone. By adjusting the length ratio of the end face 14 or adjusting the included angle between the first cutting surface 11 and the second cutting surface 12, the cutting tooth 1 in this embodiment can have different structural forms to adapt to different cutting requirements or different outer diameters of the screw shank 20.

[0120] For example, comparing the cutting tooth 1 in Example 7 with the cutting tooth 1 in Example 5, the length ratio of the end face 14 of the cutting tooth 1 in Example 7 is smaller, and a certain included angle is set between the first cutting surface 11 and the second cutting surface 12, so that the cutting edge gradually becomes thinner in the direction away from the screw head. Therefore, when the outer diameter of the screw rod 20 is large, the cutting tooth 1 in Example 7 can be selected, so that the cutting tooth 1 has higher cutting efficiency and can cut cortical bone at high speed.

[0121] Optionally, see Figure 10 The cutting teeth 1 include two teeth, which are arranged sequentially along the circumference of the screw rod 20.

[0122] Optionally, the pedicle screw in this embodiment is a hollow screw with a hollow structure to accommodate Kirschner wires.

[0123] Optionally, see Figure 10 The cutting side 13 is a cylindrical surface.

[0124] Example 8

[0125] See Figure 11 Compared with the cutting tooth 1 in Example 7, Example 8 adjusts and improves the included angle between the first cutting surface 11 and the second cutting surface 12, so that the cutting edge 1 has a different structural shape and increases the included angle between the reverse cutting edge 2 and the axis of the screw rod 20, so that the cutting tooth 1 has higher cutting efficiency when cutting in reverse.

[0126] Example 9

[0127] In the pedicle screw of this embodiment, see Figure 8 Alternatively, 12, the pedicle screw includes a groove 5, which is formed on the thread crest surface of the screw shank 20 and extends along the axial direction of the screw shank 20; wherein, the groove 5 includes a plurality of grooves, which are spaced apart along the thread line on the thread crest surface.

[0128] Optionally, see Figure 9 Alternatively, 11, the pedicle screw includes a groove 5, which is formed on the thread crest surface of the screw shank 20, and the extension direction of the groove 5 is provided with a preset angle between it and the axial direction of the screw shank 20; wherein, the groove 5 includes multiple grooves, and the multiple grooves 5 are spaced along the thread line on the thread crest surface.

[0129] Specifically, when the grooves 5 are spaced apart along the thread, these grooves can act as cutters as the screw rotates into the bone tissue, similar to the effect of a saw, which helps to penetrate the hard bone layer more easily.

[0130] By incorporating the groove 5, the self-tapping capability of the thread can be enhanced to a certain extent, facilitating rapid engagement of the thread with bone and improving the insertion efficiency of the screw shank 20. Simultaneously, as the screw rotates and advances within the bone tissue, the groove 5 serves as an effective chip removal channel, helping to remove debris generated during the cutting process and preventing its accumulation from clogging the thread or hindering screw insertion. Optionally, the groove 5 has a "V"-shaped cross-section to facilitate thread engagement with bone tissue.

[0131] Example 10

[0132] In the pedicle screw of this embodiment, see Figure 2 or Figure 10 The pedicle screw includes a groove 5, which is formed on the thread crest surface of the screw rod 20. The groove 5 extends along the axial direction of the screw rod 20, or the extension direction of the groove 5 is provided with a preset angle between the axial direction of the screw rod 20 and the axial direction of the screw rod 20. The groove 5 includes at least one, and at least one groove 5 is distributed along the circumference of the screw rod 20.

[0133] Optionally, the groove 5 includes a plurality of grooves 5, which are distributed at circumferential intervals along the screw rod 20.

[0134] By setting the groove 5, the self-tapping ability of the screw can be enhanced to a certain extent, making it easier for the threads to engage with the bone and improving the insertion efficiency of the screw shank 20. Simultaneously, when the screw rotates and advances within the bone tissue, the groove 5 can serve as an effective chip removal channel, helping to remove debris generated during the cutting process and preventing the accumulation of these debris that could clog the threads or affect screw insertion. For example, in Figure 2In the process of rotating the pedicle screw clockwise for placement, the forward cutting edge 4 has a certain cutting ability and can quickly cut bone tissue. The groove 5 on the screw rod 20 facilitates the rapid engagement of the screw with the bone, thereby improving the placement efficiency of the screw rod 20.

[0135] Example 11

[0136] In the pedicle screw of this embodiment, see Figure 14 The screw head 10 has a connecting groove 6 extending along the axial direction of the screw rod 20. A positioning surface 61 is provided at one end of the connecting groove 6 near the screw rod 20. A preset angle is provided between the extending direction of the positioning surface 61 and the axial direction of the screw rod 20.

[0137] Optionally, see Figure 15 In the pedicle screw of this embodiment, the screw head 10 is provided with a connecting groove 6 extending along the axial direction of the screw rod 20. The end of the connecting groove 6 away from the screw rod 20 is provided with a positioning surface 61. The extension direction of the positioning surface 61 is provided with a preset angle between it and the axial direction of the screw rod 20.

[0138] Specifically, the connecting groove 6 is used to cooperate with a driving tool (such as an Allen wrench) to install, fix, or connect screws to other components. The connecting groove 6 is provided with a positioning surface 61, which is an annular surface distributed around the circumference of the connecting groove 6. By setting the inclined positioning surface, when installing components such as the pressure ring 50, axial pressure can be converted into radial locking force to achieve centering and clamping, ensuring the coaxiality between the instrument and the pedicle screw, guaranteeing the alignment of the instrument and the pedicle screw's axes, achieving precise docking between the tool and the screw, and improving navigation accuracy in the robotic system.

[0139] Depending on the actual needs, the positioning surface 61 can be set at the end of the connecting groove 6 near the screw rod 20 or at the end of the connecting groove 6 away from the screw rod 20.

[0140] It should be noted that the shape of the connecting groove 6 can be selected according to the type of instrument. For example, the connecting groove 6 can be made into a square interface, a hexagonal interface, or a quincunx-shaped interface, depending on the type of instrument.

[0141] Example 12

[0142] In the pedicle screw of this embodiment, see Figure 15 The screw head 10 has a connecting groove 6 extending axially along the screw shank 20. The connecting groove 6 has a square cross-section and is used to prevent the pedicle screw from rotating.

[0143] Specifically, the connecting groove 6 is used to cooperate with the drive tool to realize the installation, fixation or connection of screws with other components. The cross-section of the connecting groove 6 is square, so that each side wall 62 of the connecting groove becomes an anti-rotation surface, which prevents the pedicle screw from rotating when connected with the drive tool, realizes the precise docking between the tool and the screw, and improves the navigation accuracy in the robot system.

[0144] Specifically, in the pedicle screw of this embodiment, the cross-section of the connecting groove 6 is designed to be square. For example, the connecting groove 6 can be set as a square. The extension direction of the side wall 62 of the connecting groove 6 is parallel to the extension direction of the screw rod. The shape of the corresponding part of the driving tool is changed accordingly so that the corresponding part of the driving tool cooperates with the connecting groove 6.

[0145] Optionally, see Figure 15 When the connecting groove 6 is a square slot, a positioning surface 61 is provided at the end of the connecting groove 6 away from the screw rod 20 or at the end of the connecting groove 6 close to the screw rod 20. This ensures centering and clamping while also preventing rotation.

[0146] Alternatively, the cross-section of the connecting groove 6 can be set to a square shape such as a pentagon or hexagon, depending on actual needs.

[0147] Example 13

[0148] In the pedicle screw of this embodiment, see Figure 16 The spherical outer wall of the screw head 10 is provided with a recessed friction groove. The friction groove is used to increase the friction between the screw head 10 and the pressure ring 50, so that the screw head 10 is more secure when locked with the pressure ring 50. The friction groove can be a spirally extended groove, which is spirally distributed on the spherical outer wall along the axial direction of the screw head 10.

[0149] Alternatively, the friction grooves may also be annular grooves distributed circumferentially around the spherical outer wall of the screw head 10, and there may be multiple annular grooves distributed at intervals along the axis of the screw head 10 on the spherical outer wall.

[0150] Example 14

[0151] A pedicle screw assembly, see Figure 1 ,as well as Figure 17 and Figure 18 The pedicle screw assembly includes: the aforementioned pedicle screw; a mounting base 40, in which the screw head 10 of the pedicle screw is housed; and a pressure ring 50, which is installed inside the mounting base 40. The pressure ring 50 has an inner concave surface 51, which is spherical and mates with the spherical outer wall of the screw head 10.

[0152] It should be noted that pedicle screws are generally used in conjunction with existing screw plugs and titanium alloy rods to form a fusion system.

[0153] Optionally, the mounting base 40 and the pedicle screw are assembled together via a retaining ring 50 to achieve final locking. The internal threads of the mounting base 40 engage with the screw plug; the thread type is not limited and can be a standard screw, trapezoidal thread, or other types. The outer diameter of the upper part of the retaining ring 50 matches the mounting base 40, and the internal groove of the upper part matches the titanium alloy rod that will be implanted. The through hole in the central area of ​​the retaining ring 50 has a threaded feature for use with a drive tool. The lower part of the retaining ring 50 has a spherical structure that matches the spherical outer wall of the screw head 10. The lower part of the retaining ring 50 is provided with several elastic petals forming an inner concave surface 51. Each elastic petal is shaped similarly to a flower petal, and the several elastic petals form a flower-like shape. The number of elastic petals is not limited, and the several elastic petals can be press-fitted with the screw head 10. Typically, the retaining ring 50 can be pre-assembled within the space inside the mounting base 40 as a component.

[0154] The pedicle screw assembly in this embodiment has unique advantages in robot-assisted surgery. When it is necessary to remove the pedicle screw or adjust its position, it can be used in conjunction with the robot. By rotating counterclockwise, it actively cuts bone tissue using the reverse cutting edge 2. The pedicle screw can act like a drill bit, cutting to form an anti-slip pit, which prevents the pedicle screw and Kirschner wire from slipping, thereby improving the screw placement accuracy and solving the technical problem in related technologies that the pedicle screw cannot produce a cutting effect when rotating in the reverse direction.

[0155] In the pedicle screw assembly of this embodiment, either a split screw or an integral screw can be selected according to actual needs.

[0156] In the pedicle screw assembly of this embodiment, the mounting base 40 can be of different types depending on the surgical procedure. For example, the mounting base 40 can be made entirely of TC4 metal and machined. Alternatively, a flexible structure can be used to connect with a short mounting base through a certain interface. Or, the mounting base 40 can be combined with a flexible extension structure. The flexible extension structure can be made of materials such as PEEK or PPSU. With the corresponding instruments, this mounting base combination is more suitable for minimally invasive spinal surgery.

[0157] In some embodiments, the pedicle screw assembly is used as follows: In conventional or robot-assisted surgery, the pedicle screw is first held in place using a screw clamp and precisely implanted into the bone tissue according to the preoperative plan. Then, the mounting base 40 and pressure ring 50 are held in place using a mounting base holder, and pushed along the screw axis to the screw head 10 position. A "click" sound indicates that the mounting base 40 and screw head 10 are locked in place. At this point, the mounting base holder can be removed to proceed to the next step. If the selected mounting base 40 is not suitable for the current surgical procedure, the installed mounting base 40 can be loosened using a special disassembly tool, replaced with a suitable model, re-pressed in, and locked to continue with subsequent screw and rod placement operations.

[0158] The pedicle screw and pedicle screw assembly in this embodiment have teeth at their tips, allowing the screw to cut during counterclockwise rotation and quickly engage with bone during clockwise insertion, ensuring stable screw placement. The pedicle screw and pedicle screw assembly in this embodiment, operated with corresponding instruments, can be efficiently and precisely implanted into bone tissue, making them suitable not only for traditional open or minimally invasive surgery, but also, and especially, for robot-assisted surgical systems.

[0159] The pedicle screw and pedicle screw assembly in this embodiment provide a comprehensive screw system that meets the requirements of both traditional surgical procedures and robotic surgery. It is suitable for both open surgery and minimally invasive procedures such as transforaminal lumbar interbody fusion (MIS-TLIF). The pedicle screw assembly in this embodiment can be equipped with different types of mounting bases 40 to meet the requirements of various surgical procedures, ensuring optimal operational results in a variety of application scenarios.

[0160] It should be noted that the embodiments in this application are not limited to the above embodiments. The various technical features of the pedicle screw can be flexibly combined according to actual application needs. For example, the shape and number of cutting teeth 1, the structural form of cutting groove 3, the screw type (such as hollow screw or solid screw), and the number of thread lines can be arbitrarily combined or replaced to form a variety of different implementation methods.

[0161] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0162] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0163] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0164] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0165] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A pedicle screw, characterized in that, include: The screw consists of a screw head (10), a screw shank (20), and a tip (30), which are connected sequentially along the axial direction of the pedicle screw. The screw shank (20) has threads on its outer circumferential surface. The tip (30) is located at the end of the screw shank (20) away from the screw head (10). The tip (30) has cutting teeth (1) with reverse cutting edges (2). The cutting direction of the reverse cutting edge (2) is opposite to the helical direction of the thread, so that when the pedicle screw rotates in a direction opposite to the helical direction of the thread, it cuts bone tissue through the reverse cutting edge (2).

2. The pedicle screw according to claim 1, characterized in that, The cutting teeth (1) include: The first cutting surface (11) and the second cutting surface (12) are connected in sequence. The first cutting surface (11) and the second cutting surface (12) intersect at the end of the cutting tooth (1) away from the screw head (10). The cutting side (13) is located on the outer periphery of the cutting tooth (1). The cutting side (13) is connected to the radial outer side of the first cutting surface (11) and the second cutting surface (12) respectively. The intersection of the cutting side (13) and the first cutting surface (11) forms the reverse cutting edge (2).

3. The pedicle screw according to claim 2, characterized in that, The tip (30) has a spherical structure, and the cutting teeth (1) include a plurality of teeth. The plurality of cutting teeth (1) are circumferentially distributed around the axis of the tip (30), and the cutting side surface (13) is formed on the outer spherical surface of the tip (30).

4. The pedicle screw according to claim 1, characterized in that, The cutting teeth (1) include: A first cutting surface (11) and a second cutting surface (12), wherein the first cutting surface (11) and the second cutting surface (12) are arranged opposite to each other; The cutting side (13) is located on the outer periphery of the cutting tooth (1). The cutting side (13) is connected to the radial outer side of the first cutting surface (11) and the second cutting surface (12) respectively. The intersection of the cutting side (13) and the first cutting surface (11) forms the reverse cutting edge (2).

5. The pedicle screw according to claim 4, characterized in that, The cutting teeth (1) include at least two, and a cutting groove (3) is formed between two adjacent cutting teeth (1). The cutting groove (3) includes a cutting groove surface (31). The two sides of the cutting groove surface (31) are respectively connected to the two adjacent cutting teeth (1). The cutting groove surface (31) is an arc-shaped surface.

6. The pedicle screw according to claim 1, characterized in that, The cutting teeth (1) include: A first cutting surface (11), an end face (14), and a second cutting surface (12) are connected in sequence, with the second cutting surface (12) being disposed opposite to the first cutting surface (11); The cutting side (13) is located on the outer periphery of the cutting tooth (1). The cutting side (13) is connected to the radial outer side of the first cutting surface (11) and the second cutting surface (12) respectively. The intersection of the cutting side (13) and the first cutting surface (11) forms the reverse cutting edge (2).

7. The pedicle screw according to claim 2, 4, or 6, characterized in that, The intersection of the second cutting surface (12) and the cutting side surface (13) forms a positive cutting edge (4), and the cutting direction of the positive cutting edge (4) is opposite to the cutting direction of the reverse cutting edge (2).

8. The pedicle screw according to claim 6, characterized in that, The intersection of the second cutting surface (12) and the cutting side surface (13) forms a first positive cutting edge (41), and the intersection of the end face (14) and the cutting side surface (13) forms a second positive cutting edge (42). The cutting directions of the first positive cutting edge (41) and the second positive cutting edge (42) are opposite to the cutting direction of the reverse cutting edge (2).

9. The pedicle screw according to claim 8, characterized in that, The cutting tooth (1) extends in a spiral shape along the thread line of the thread, and the side of the cutting tooth (1) away from the first positive cutting edge (41) is connected to the thread blade of the screw rod (20).

10. The pedicle screw according to claim 2, claim 4, or claim 6, characterized in that, The cutting teeth (1) include a plurality of teeth, which are arranged sequentially along the circumference of the screw rod (20).

11. The pedicle screw according to claim 2, claim 4, or claim 6, characterized in that, The cutting teeth (1) include two teeth, which are arranged sequentially along the circumference of the screw rod (20).

12. The pedicle screw according to claim 1, characterized in that, The pedicle screw includes a groove (5), which is formed on the thread crest surface of the screw rod (20). The groove (5) extends along the axial direction of the screw rod (20), or a preset angle is provided between the extension direction of the groove (5) and the axial direction of the screw rod (20). The groove (5) includes a plurality of grooves, which are spaced apart on the thread crest surface along the thread line of the thread.

13. The pedicle screw according to claim 1, characterized in that, The pedicle screw includes a groove (5), which is formed on the thread crest surface of the screw rod (20). The groove (5) extends along the axial direction of the screw rod (20), or a preset angle is provided between the extension direction of the groove (5) and the axial direction of the screw rod (20). The groove (5) includes at least one, and at least one groove (5) is distributed circumferentially along the screw rod (20).

14. The pedicle screw according to claim 1, characterized in that, The screw head (10) has a connecting groove (6) extending axially along the screw rod (20). The connecting groove (6) has a positioning surface (61) at one end near the screw rod (20) or at one end away from the screw rod (20). The extending direction of the positioning surface (61) is set with a preset angle between it and the axial direction of the screw rod (20).

15. The pedicle screw according to claim 1, characterized in that, The screw head (10) has a connecting groove (6) extending axially along the screw rod (20). The connecting groove (6) has a square cross-section and is used to prevent the pedicle screw from rotating.

16. A pedicle screw assembly, characterized in that, The pedicle screw assembly includes: Pedicle screw as described in any one of claims 1-15; Mounting base (40), wherein the mounting base (40) contains the screw head (10) of the pedicle screw. A pressure ring (50) is installed inside the mounting base (40). The pressure ring (50) has a concave surface (51) inside. The concave surface (51) is spherical and matches the spherical outer wall of the screw head (10).

Images