Micro-motion universal pedicle screw

Abstract

The utility model relates to the technical field of medical instruments, in particular to a micro-motion universal pedicle screw. A screw rod, a screw sleeve and a fixing pin are arranged through the micro-motion ball head nail; the head of the screw rod is cylindrical and is matched with the size of an inner hole of the screw sleeve; an inclined hole is formed in the cylindrical structure of the head of the screw rod and is matched with a fixing pin to connect the screw sleeve into a whole; the size of the polished rod structure in the middle of the screw rod is smaller than that of an inner hole of the screw sleeve; the tail portion of the screw rod is of a ball head structure, and the ball head structure of the tail portion of the screw rod is matched with a screw base spherical cavity of the screw base and a limiting block spherical cavity of the limiting mechanism to swing, so that reliable elastic fixing is achieved while the fixing strength of an implant is guaranteed, the influence of the rigidity of the implant can be reduced, and growth of callus is promoted; the healing rate of the affected part is accelerated, and meanwhile, the risks of screw breaking, screw seat cracking and the like in clinical application are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, and in particular to a micro-motion universal pedicle screw. Background Technology

[0002] Most pedicle screws used for posterior spinal fixation are made of titanium alloy, which has poor wear resistance, low strength and hardness, so screw breakage often occurs during clinical application.

[0003] Furthermore, conventional pedicle screws in existing technologies are prone to fatigue fracture when subjected to repeated loads due to the physical properties of their manufacturing materials, especially under large dynamic loads, which may cause secondary injury to patients.

[0004] Meanwhile, the fixation provided by conventional pedicle screws in existing technologies is rigid, which restricts the range of motion of the implanted spinal segment, leading to a slower healing rate for patients. Utility Model Content

[0005] The purpose of this invention is to provide a micro-motion universal pedicle screw that addresses the shortcomings of existing technologies. This screw ensures the fixation strength of the implant while also providing reliable elastic fixation, reducing the impact of implant stiffness, promoting callus growth, accelerating the healing rate of the affected area, and effectively reducing the risks of screw breakage and screw seat cracking in clinical applications.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a micro-motion universal pedicle screw, comprising a micro-motion ball head screw, a limiting mechanism, and a screw seat; the micro-motion ball head screw is provided with a screw rod, a screw sleeve, and a fixing pin; the head of the screw rod is cylindrical and matches the inner hole size of the screw sleeve, and the cylindrical structure of the screw rod head is provided with an oblique hole, which, together with the fixing pin, connects the screw sleeve into a whole; the middle part of the screw rod is a smooth rod structure, and the size of the smooth rod structure in the middle part of the screw rod is smaller than the inner hole size of the screw sleeve; the tail of the screw rod is a ball head structure, which oscillates in conjunction with the spherical cavity of the screw seat of the screw seat and the spherical cavity of the limiting block of the limiting mechanism; the head of the screw sleeve has an opening and matches the cylindrical structure of the screw rod head and the smooth rod structure in the middle part of the screw rod; the fixing pin connects the screw rod and the screw sleeve into a whole through the oblique hole structure of the screw rod and the screw sleeve.

[0007] Furthermore, the screw seat has an overall hollow cylindrical structure, and the upper half of the screw seat is milled with a U-shaped groove.

[0008] Furthermore, four T-slot features are provided on the outer wall of the screw seat, which is in the same direction as the U-shaped groove.

[0009] Furthermore, the inner hole of the screw seat is provided with a screw seat boss; the bottom of the screw seat is provided with a spherical cavity of the screw seat and cooperates with the ball head structure at the tail of the screw shank to swing in conjunction with the micro-motion ball head nail.

[0010] Furthermore, the limiting mechanism is cylindrical in shape, and the head of the limiting mechanism is a limiting mechanism boss structure. The size of the limiting mechanism boss structure is larger than that of the screw seat boss, and the limiting mechanism is made of soft material.

[0011] Furthermore, the spherical cavity of the limiting block at the bottom of the limiting mechanism cooperates with the ball head structure at the tail of the screw rod. When subjected to pressure, it slightly deforms and presses the micro-moving ball head nail, preventing the micro-moving ball head nail from continuing to swing in all directions.

[0012] Furthermore, the outer side of the screw sleeve is provided with a bone thread structure.

[0013] Furthermore, the opening at the head of the screw sleeve has a trumpet-shaped structure.

[0014] Furthermore, the fixing pin is cylindrical in shape.

[0015] Furthermore, the cylindrical structure at the head of the screw rod is provided with an oblique hole, which, together with the fixing pin, connects the screw sleeve into a whole, and then the fixing is strengthened by laser welding.

[0016] The system comprises a micro-moving ball head pin, a limiting mechanism, and a screw seat. The micro-moving ball head pin includes a screw rod, a screw sleeve, and a fixing pin. The head of the screw rod is cylindrical and matches the inner diameter of the screw sleeve. An oblique hole is provided on the cylindrical structure of the screw rod head, which, together with the fixing pin, connects the screw sleeve to the system as a whole. The middle section of the screw rod is a smooth rod structure, the size of which is smaller than the inner diameter of the screw sleeve. The tail of the screw rod is a ball head structure, which connects to the spherical cavity of the screw seat and the screw seat. The limiting block of the limiting mechanism has a spherical cavity that swings in coordination with the limiting mechanism; the head of the screw sleeve has an opening and engages with the cylindrical structure of the head of the screw rod and the smooth rod structure in the middle of the screw rod; the fixing pin connects the screw rod and the screw sleeve into a whole structure through the oblique hole structure of the screw rod and the screw sleeve, so as to ensure the fixation strength of the implant while also having reliable elastic fixation, which can reduce the influence of implant stiffness, promote callus growth, accelerate the healing rate of the lesion site, and effectively reduce the risks of screw breakage and screw seat cracking in clinical applications. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front sectional view of a micro-motion universal pedicle screw according to the present invention;

[0019] Figure 2 This is an exploded view of a micro-motion universal pedicle screw according to the present invention;

[0020] Figure 3 This is a schematic diagram of a micro-motion universal pedicle screw and a micro-motion ball head screw according to the present invention;

[0021] Figure 4 This is a schematic diagram of a micro-motion universal pedicle screw limiting mechanism according to the present invention;

[0022] Figure 5 This is a schematic diagram of a micro-motion universal pedicle screw seat according to the present invention;

[0023] Figure label:

[0024] Micro-moving ball head pin 1, screw rod 1-1, screw sleeve 1-2, fixing pin 1-3, limiting mechanism 2, limiting block spherical cavity 2-1, limiting mechanism boss structure 2-2, screw seat 3, screw seat spherical cavity 3-1, U-shaped groove 3-2, T-shaped groove feature 3-3, screw seat boss 3-4. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] A type of micro-motion universal pedicle screw, such as Figure 1 , 2As shown, it includes a micro-moving ball head pin 1, a limiting mechanism 2, and a screw seat 3; the micro-moving ball head pin 1 is provided with a screw rod 1-1, a screw sleeve 1-2, and a fixing pin 1-3; the head of the screw rod 1-1 is cylindrical and matches the inner hole size of the screw sleeve 1-2; the cylindrical structure of the head of the screw rod 1-1 is provided with an oblique hole, which, together with the fixing pin 1-3, connects the screw sleeve 1-2 into a whole; and is reinforced and fixed by laser welding. The middle section of the screw rod 1-1 is a smooth rod structure, which serves as a support and connection. The size of the smooth rod structure in the middle section of the screw rod 1-1 is smaller than the inner hole size of the screw sleeve 1-2, which facilitates the micro-motion of the micro-movement ball head pin. The tail of the screw rod 1-1 is a ball head structure, which cooperates with the spherical cavity 3-1 of the screw seat 3 and the spherical cavity 2-1 of the limiting block of the limiting mechanism 2 to swing. The head of the screw sleeve 1-2 has an opening and cooperates with the cylindrical structure at the head of the screw rod 1-1 and the smooth rod structure in the middle section of the screw rod 1-1. The fixing pin 1-3 connects the screw rod 1-1 and the screw sleeve 1-2 into a whole through the oblique hole structure of the screw rod 1-1 and the screw sleeve 1-2.

[0028] Specifically, the ball-head design of the tail of the micro-motion ball-head screw 1 allows the pedicle screw to achieve micro-motion while maintaining a certain degree of stability. This helps reduce stress concentration and lowers the risk of bone tissue degeneration and reduced healing rate around the implant caused by long-term rigid fixation. Micro-motion can promote callus formation, accelerate the fracture healing process, and improve the patient's recovery speed and overall treatment effect. The spherical cavity of the limiting mechanism 2 and screw seat 3 perfectly matches the ball-head structure of the micro-motion ball-head screw 1, ensuring the stability of the pedicle screw when needed while allowing it to perform micro-motion within a certain range. This maintains the overall stability of the spine while also taking into account the physiological activity needs of the spine. Reasonable limiting avoids loosening or displacement of the implant due to excessive micro-motion, improving the long-term stability and safety of the implant. The screw rod 1-1 and screw sleeve 1-2 are connected by an oblique hole structure and fixing pin 1-3, and the fixation is strengthened by laser welding, improving the overall strength and durability of the pedicle screw. Meanwhile, the design difference between the central smooth rod structure of screw rod 1-1 and the inner hole size of screw sleeve 1-2 provides the necessary space for micro-motion, further optimizing the overall structure of the pedicle screw, improving its wear resistance, strength, and hardness, and reducing the risk of screw breakage. The application of laser welding technology further enhances the robustness of the connection, improving the reliability and service life of the implant.

[0029] As a preferred embodiment of the above, such as Figure 3 As shown, the screw seat 3 has a hollow cylindrical structure. The upper part of the screw seat 3 is milled with a U-shaped groove 3-2 to accommodate orthopedic implants such as orthopedic rods.

[0030] Specifically, the hollow cylindrical structure of the screw seat 3 not only reduces the overall weight and material costs but also maintains sufficient structural strength. The hollow interior provides space for mechanical integration or adjustment with other orthopedic implants, achieving lightweight, low-cost, and efficient production while meeting functional requirements. The upper part of the screw seat 3 is milled with a U-shaped groove 3-2, utilizing the space to provide a stable support and positioning point for orthopedic implant rods. The U-shaped groove design allows for easy insertion and fixation of the orthopedic rod, while allowing for fine-tuning within a certain range to adapt to different patients' spinal morphologies and treatment needs. This improves the practicality and flexibility of the screw seat 3, making the entire micro-motion universal pedicle screw system more adaptable to complex and varied clinical application scenarios. It also allows the orthopedic rod to more stably support the spine while allowing for natural spinal movement within a micro-motion range, which helps promote fracture healing and spinal function recovery.

[0031] As a preferred embodiment of the above, such as Figure 1 As shown, four T-shaped grooves 3-3 are provided on the outer wall of the screw seat 3, which is in the same direction as the U-shaped groove 3-2, for cooperation with the implantation device.

[0032] Specifically, the T-slot feature 3-3 allows for a more secure connection between the implanted instrument and the screw seat 3. The combination of the head and bottom of the T-slot provides additional connection area and a locking mechanism, thereby enhancing connection stability. It also makes the implanted instrument easier to insert and position. Compared to traditional connection methods, the T-slot offers a more intuitive and simpler operation, reducing the difficulty of the procedure. The four T-slot features 3-3 provide multiple connection position options for the implanted instrument, allowing the screw seat 3 to adapt to implanted instruments of different sizes and shapes, thus meeting diverse implantation needs. Because the T-slot feature 3-3 enhances connection stability and ease of operation, surgeons can connect the implanted instrument to the screw seat more quickly and accurately during surgery, helping to shorten surgical time, improve surgical efficiency, and reduce the risk of surgical complications caused by unstable connections or improper operation. Stable connection and simple operation make the surgical process safer and more reliable.

[0033] As a preferred embodiment of the above, such as Figure 2 As shown, the screw seat 3 has a screw seat boss 3-4 in the inner hole, which is a fitting structure to restrict the release of the limiting block; the bottom of the screw seat 3 is provided with the screw seat spherical cavity 3-1 and it fits with the ball head structure at the tail of the screw rod 1-1, which cooperates with the micro-motion ball head nail 1 to swing.

[0034] Specifically, the screw seat boss 3-4 effectively restricts the dislodgement of the limiting block, ensuring its stable position within the screw seat and preventing implant failure or patient injury due to movement or dislodgement of the limiting block. The cooperation between the spherical cavity 3-1 of the screw seat and the ball head structure at the tail of the screw rod 1-1 provides a stable swinging basis for the micro-motion ball head screw 1, ensuring the realization of the micro-motion function while maintaining the overall stability of the implant. The spherical cavity 3-1 of the screw seat allows the ball head structure at the tail of the screw rod 1-1 to swing freely within a certain range, thereby realizing the micro-motion function, helping to reduce stress concentration, improve the durability of the implant, and promote fracture healing. By enhancing structural stability and optimizing micro-motion performance, the design of the screw seat 3 provides patients with better treatment results. Stable implant connection and accurate micro-motion function help promote fracture healing, reduce complications, and improve the patient's quality of life.

[0035] As a preferred embodiment of the above, such as Figure 1 As shown, the limiting mechanism 2 is cylindrical in shape. The head of the limiting mechanism 2 is a limiting mechanism boss structure 2-2. The size of the limiting mechanism boss structure 2-2 is larger than that of the screw seat boss 3-4. The limiting mechanism 2 is made of TA3G material. Because this material is relatively soft, it can be pressed into the inner hole of the screw seat.

[0036] Specifically, the limiting mechanism 2 is designed as a cylinder with a boss structure at the head, and the size of the boss structure is larger than that of the screw seat boss 3-4. This ensures the stable positioning of the limiting mechanism 2 within the screw seat 3, while preventing excessive insertion or dislodgement, thus guaranteeing the overall stability and safety of the implant. The limiting mechanism 2 is made of TA3G material, which is relatively soft and has good ductility and plasticity. This allows the limiting mechanism 2 to be easily pressed into the inner hole of the screw seat 3, forming a tight fit. This material selection not only simplifies the assembly process but also improves the reliability and efficiency of assembly. Due to the softness of TA3G material, the limiting mechanism 2 can be more easily pressed into the inner hole of the screw seat 3, forming a tight fit. This tight fit helps improve the overall stability and durability of the implant. Meanwhile, this material selection simplifies the assembly process, reduces assembly difficulty, and improves assembly efficiency. The boss structure design of the limiting mechanism 2, as well as its size difference with the screw seat boss 3-4, enables the limiting mechanism 2 to be stably positioned in screw seats of different sizes, enhancing the adaptability of the implant. This allows the same limiting mechanism 2 to be applicable to a variety of different screw seats, thereby reducing production costs and inventory pressure.

[0037] As a preferred embodiment of the above, such as Figure 1As shown, the spherical cavity 2-1 of the limiting block at the bottom of the limiting mechanism 2 cooperates with the ball head structure at the tail of the screw rod 1-1. When subjected to pressure, it slightly deforms and presses the micro-moving ball head nail 1, preventing the micro-moving ball head nail 1 from continuing to swing in all directions.

[0038] Specifically, the precise positioning of the micro-motion ball head screw 1 is achieved through the cooperation of the spherical cavity 2-1 of the limiting block and the ball head structure at the tail of the screw rod 1-1. When subjected to pressure, the spherical cavity 2-1 of the limiting block can slightly deform and press the micro-motion ball head screw 1, thereby effectively limiting its omnidirectional swing range and improving the stability and safety of the implant. During surgery or patient activity, even if subjected to external forces, the micro-motion ball head screw 1 will not dislocate or be damaged due to excessive swing, thus ensuring the long-term stability of the implant and the safety of the patient. It ensures the stability of the implant while retaining the micro-motion function, which helps reduce stress concentration and promotes fracture healing. Through innovative limiting mechanism and optimized micro-motion performance, the design of the limiting mechanism 2 provides patients with better treatment results, ensures the stability and safety of the implant, and retains the necessary micro-motion function, which helps promote faster fracture healing and faster patient recovery.

[0039] As a preferred embodiment of the above, such as Figure 1 As shown, the outer side of the screw sleeve 1-2 is provided with a bone thread structure to provide reliable holding force.

[0040] Specifically, the bone thread structure significantly enhances the holding force between the screw sleeve 1-2 and the bone. By increasing the contact area and friction with the bone surface, the screw sleeve can be more firmly fixed to the bone, preventing loosening or dislodgement. Because the bone thread structure provides reliable holding force, the screw sleeve 1-2 can more effectively transmit and distribute stress, thereby improving the overall stability of the implant. The bone thread structure also makes the screw sleeve 1-2 easier to insert during surgery and more stable after insertion, helping to simplify surgical procedures, shorten surgical time, and reduce surgical risks. Simultaneously, a stable implant also helps improve patient treatment outcomes and recovery speed. By enhancing holding force and improving implant stability, patient safety is significantly improved. It reduces the risk of complications caused by implant loosening or dislodgement, such as pain and infection, thereby improving the patient's quality of life and recovery outcomes.

[0041] As a preferred embodiment of the above, such as Figure 1 As shown, the head opening of the screw sleeve 1-2 has a trumpet-shaped structure, which can increase the swing amplitude of the micro-motion universal pedicle.

[0042] Specifically, the funnel-shaped structure gradually increases the opening area of ​​the screw sleeve 1-2 head, allowing the micro-motion universal pedicle to swing within a wider range. This increases the implant's flexibility under stress, helping it better adapt to the physiological movement and stress distribution of the bone. By increasing the swing amplitude, the funnel-shaped structure helps distribute stress more evenly across the entire implant, reducing the possibility of stress concentration. This helps reduce the risk of fatigue damage and failure of the implant due to long-term stress. The funnel-shaped structure also allows the screw sleeve 1-2 to better adapt to different patients' bone morphologies and surgical needs. During surgery, the surgeon can adjust the implantation position and angle of the screw sleeve according to the actual situation to achieve the best surgical results and patient comfort. The increased swing amplitude helps reduce the pressure and damage of the implant on surrounding bone tissue, thereby promoting blood circulation and nutrient supply to the fracture site, helping to promote faster fracture healing and reduce the occurrence of complications.

[0043] As a preferred embodiment of the above, such as Figure 1 As shown, the fixing pins 1-3 are cylindrical in shape.

[0044] As a preferred embodiment of the above, such as Figure 1 As shown, the cylindrical structure at the head of the screw rod 1-1 has an oblique hole, which, together with the fixing pin 1-3, connects the screw sleeve 1-2 into a whole, and then the screw is reinforced and fixed by laser welding.

[0045] Specifically, the cylindrical shape of the retaining pin 1-3 allows it to be easily inserted into the oblique hole on the cylindrical structure of the screw rod 1-1 head, forming a stable connection with the screw sleeve 1-2. The cylindrical structure not only facilitates processing and manufacturing but also ensures the reliability and durability of the connection. The oblique hole on the cylindrical structure of the screw rod 1-1 head facilitates the insertion of the retaining pin 1-3, allowing it to pass more easily through the screw rod and engage with the screw sleeve 1-2, thus forming a unified structure. This simplifies the assembly process and improves assembly accuracy and efficiency. After connecting the screw sleeve 1-2 to the screw rod 1-1 as a whole via the retaining pin 1-3, laser welding technology is used for reinforcement and fixation. Laser welding has advantages such as concentrated energy, rapid heating and cooling processes, and a large weld depth-to-width ratio. It can ensure the strength and sealing of the welded part, which not only improves the overall stability of the implant, but also reduces the heat-affected zone and deformation risk caused by welding. Through the cooperation of fixing pin 1-3 and oblique hole, as well as the reinforced fixation by laser welding, the connection between screw sleeve 1-2 and screw rod 1-1 is more firm and reliable, thus being able to withstand greater tensile and compressive forces, ensuring the stability and durability of the implant in the body.

[0046] In this design, the micro-motion ball head pin 1 and the screw seat 3 are made of forged cobalt-chromium-molybdenum alloy, and the limiting mechanism 2 is made of pure titanium TA3G. All components are machined. During assembly, the micro-motion ball head pin 1 is first installed into the screw seat 3, and then the limiting mechanism 2 is pressed under the screw seat boss, so that the screw seat 3, the limiting mechanism 2, and the micro-motion ball head pin 1 are assembled into a whole.

[0047] Specifically, thanks to the physical properties of each material, the risks of broken screws and cracked screw seats in clinical applications are effectively reduced.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A micro-motion universal pedicle screw, characterized in that: Includes a micro-moving ball head pin (1), a limiting mechanism (2), and a screw seat (3); The micro-moving ball head nail (1) is provided with a screw rod (1-1), a screw sleeve (1-2), and a fixing pin (1-3); The head of the screw rod (1-1) is cylindrical and matches the inner hole size of the screw sleeve (1-2). The cylindrical structure of the head of the screw rod (1-1) is provided with an oblique hole and cooperates with the fixing pin (1-3) to connect the screw sleeve (1-2) into a whole. The middle part of the screw rod (1-1) is a smooth rod structure, and the size of the smooth rod structure in the middle part of the screw rod (1-1) is smaller than the inner hole size of the screw sleeve (1-2); The tail of the screw rod (1-1) is a ball head structure, and the ball head structure at the tail of the screw rod (1-1) is in conjunction with the spherical cavity (3-1) of the screw seat (3) and the spherical cavity (2-1) of the limiting block of the limiting mechanism (2) to swing. The head of the screw sleeve (1-2) has an opening and engages with the cylindrical structure at the head of the screw rod (1-1) and the smooth rod structure in the middle of the screw rod (1-1); the fixing pin (1-3) connects the screw rod (1-1) and the screw sleeve (1-2) into a whole through the oblique hole structure of the screw rod (1-1) and the screw sleeve (1-2).

2. The micro-motion universal pedicle screw according to claim 1, wherein, The screw seat (3) has a hollow cylindrical structure, and the upper half of the screw seat (3) is milled with a U-shaped groove (3-2).

3. The micro-motion universal pedicle screw of claim 2, wherein, Four T-slot features (3-3) are provided on the outer wall of the screw seat (3) which is in the same direction as the U-shaped groove (3-2).

4. The micro-motion universal pedicle screw of claim 1, wherein, The screw seat (3) has a screw seat boss (3-4) in the inner hole; the bottom of the screw seat (3) is provided with a spherical cavity (3-1) and cooperates with the ball head structure at the tail of the screw rod (1-1) to swing in conjunction with the micro-movement ball head nail (1).

5. The micro-motion universal pedicle screw of claim 4, wherein, The limiting mechanism (2) is cylindrical in shape. The head of the limiting mechanism (2) is a limiting mechanism boss structure (2-2). The size of the limiting mechanism boss structure (2-2) is larger than that of the screw seat boss (3-4). The limiting mechanism (2) is made of soft material.

6. The micro-motion universal pedicle screw of claim 5, wherein, The spherical cavity (2-1) of the limiting block at the bottom of the limiting mechanism (2) cooperates with the ball head structure at the tail of the screw rod (1-1). When subjected to pressure, it slightly deforms and presses the micro-moving ball head nail (1), preventing the micro-moving ball head nail (1) from continuing to swing in all directions.

7. The micro-motion universal pedicle screw of claim 1, wherein, The outer side of the screw sleeve (1-2) is provided with a bone thread structure.

8. The micro-motion universal pedicle screw of claim 1, wherein, The head opening of the screw sleeve (1-2) has a trumpet-shaped structure.

9. The micro-motion universal pedicle screw of claim 1, wherein, The fixing pin (1-3) is cylindrical in shape.

10. The micro-motion universal pedicle screw of claim 9, wherein, The screw rod (1-1) has a cylindrical head with an oblique hole, which, together with the fixing pin (1-3), connects the screw sleeve (1-2) into a whole, and then the screw is reinforced and fixed by laser welding.

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