A targeting device for posterior cervical pedicle screw fixation

Abstract

This invention provides a targeting device for posterior cervical pedicle screw fixation surgery, belonging to the field of medical device technology. It includes a targeting device body, one end of which is fixedly connected to a snap-fit ​​component for snapping and fixing with the targeting device body; and a limiting component for assisting the target device in adhering to the bone surface, connected to the snap-fit ​​component. By incorporating the snap-fit ​​component and the limiting component, this invention improves the overall stability of the device and facilitates disassembly, thus enabling easier independent engagement with pedicle screws. The limiting component provides stable triangular fixation to the bone surface and is suitable for uneven bone surfaces, ensuring a tight fit between the limiting component and the bone surface, maintaining a stable holding force for the target device and preventing displacement during operation.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a target device for posterior cervical pedicle screw fixation surgery. Background Technology

[0002] Posterior cervical pedicle screw fixation is an important procedure in posterior cervical surgery. By implanting screws into the pedicles of the cervical vertebrae and using connecting rods and other instruments, cervical segmental fixation and stability reconstruction are achieved. It is suitable for cervical fractures, dislocations, degenerative instability, deformities, etc. It can effectively maintain the cervical spine sequence and create conditions for spinal cord nerve recovery. Precise positioning is required to avoid damage to surrounding blood vessels and nerves.

[0003] The target device used in posterior cervical pedicle screw fixation must be precisely positioned to ensure that the screw is implanted along the pedicle axis. If there are bone defects, unevenness, or incomplete exposure of the bone surface during the operation, or if there is residual soft tissue such as muscle and fascia between the target device and the bone surface, it will result in poor fit and loss of stable holding force of the target device, leading to displacement during the operation. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a targeting device for posterior cervical pedicle screw fixation surgery. By setting up a snap-fit ​​component and a limiting component, the snap-fit ​​component not only improves the overall stability of the device but also facilitates disassembly, thus making it easier to independently cooperate with the pedicle screw. The limiting component not only provides stable triangular fixation to the bone surface but also adapts to uneven bone surfaces, ensuring a tight fit between the limiting component and the bone surface. This allows the targeting device to maintain a stable holding force and prevent displacement during operation. Through the above settings, the problem of existing targeting devices, if there are bone surface defects, unevenness, or incomplete exposure of the bone surface during surgery, leaving behind soft tissues such as muscle and fascia between the targeting device and the bone surface, can lead to a loose fit, causing the targeting device to lose its stable holding force and resulting in displacement during operation.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A targeting device for posterior cervical pedicle screw fixation includes a targeting device body, one end of which is fixedly connected to a snap-fit ​​component for snap-fitting and fixing to the targeting device body; a limiting component is connected to the snap-fit ​​component to assist the targeting device in adhering to the bone surface.

[0007] Optionally, the snap-fit ​​assembly includes a snap-fit ​​groove formed at one end of the target body, an alignment point is formed on the side of the snap-fit ​​groove near the outer wall of the target body, a snap-fit ​​groove is formed at the bottom of the snap-fit ​​groove, a guide wire is inserted into one end of the target body, and a limit component is snapped onto the inner wall of the snap-fit ​​groove.

[0008] Optionally, the limiting component includes a pre-pass component that is snapped onto the inner wall of the snap-fit ​​groove. One end of the pre-pass component near the snap-fit ​​groove is fixedly connected to a uniformly distributed snap-fit ​​block. The other end of the pre-pass component is threaded with a positioning sleeve. The end of the positioning sleeve away from the snap-fit ​​block has a uniformly distributed arc-shaped groove. A connecting rod is fixedly connected to the inner wall of the arc-shaped groove. The bottom of the connecting rod is rotatably connected to a limiting pin.

[0009] Optionally, the card block and the alignment point are positioned in a one-to-one correspondence, the outer contour size of the card block is adapted to the inner wall size of the alignment point, the alignment point is connected to the card slot, and the thickness of the card block is adapted to the inner wall size of the card slot.

[0010] Optionally, the pre-through component is a hollow structure, and the wall thickness of the pre-through component is adapted to the inner wall size of the snap-fit ​​groove.

[0011] Optionally, the size by which the card block protrudes from the outer wall of the pre-pass component is consistent with the outer contour size of the positioning sleeve.

[0012] Optionally, the top of the connecting rod is fixedly connected to the positioning sleeve, the connecting rod passes through the inner wall of the arc-shaped groove, and a ball is fixedly connected to the bottom of the connecting rod.

[0013] Optionally, a slanted protrusion is fixedly connected to one side of the limiting pin, the slanted protrusion forming an angle with the limiting pin, and the limiting pin and the slanted protrusion are manufactured as a single piece.

[0014] Optionally, a circular groove is provided at the intersection of the limiting pin and the oblique protrusion, and the inner diameter of the circular groove is larger than the outer diameter of the sphere.

[0015] Optionally, the top of the circular groove has an opening that communicates with the circular groove, and the inner wall dimension of the opening is larger than the outer wall dimension of the connecting rod.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In the above scheme, by setting up a snap-fit ​​component and a limiting component, the snap-fit ​​component can not only improve the stability of the overall device, but also facilitate disassembly, thus making it easier to independently cooperate with the pedicle screw; the limiting component can not only provide stable triangular fixation to the bone surface, but also be applicable to uneven bone surfaces, ensuring that the limiting component fits tightly to the bone surface, so that the target maintains a stable holding force and prevents displacement during operation.

[0018] By setting up alignment points, slots, and locking blocks, during connection, the alignment points and locking blocks are aligned and rotated into place, eliminating the need for precise alignment of threads and other complex structures, saving intraoperative time and improving operational efficiency. During disassembly, rotation is performed again to align the alignment points and locking blocks for easy separation, avoiding the problem of inconvenient operation due to the small size of the pre-circuit and positioning sleeve tools. It can be connected in conjunction with the existing tool target body, using the target body to adjust the fit requirements between the pre-circuit and positioning sleeve, ensuring efficient and smooth fixation surgery.

[0019] By setting a limiting screw and an oblique protrusion, there is an angle between the oblique protrusion and the limiting screw. The pre-pass component is used to squeeze the oblique protrusion, forcing the limiting screw to expand and obliquely insert into the bone surface. The oblique fixation can increase the contact area and friction between the limiting screw and the bone tissue, which is conducive to improving the stability of fixation.

[0020] By using a circular groove and a sphere, the limiting screw can rotate around the bottom of the connecting rod when subjected to external pressure. This not only changes the angle at which it is inserted into the bone surface, improving the stability of the fixation, but also facilitates the separation of the limiting screw from the bone surface during the insertion process of the pedicle screw, thus improving the overall efficiency of the surgery. Attached Figure Description

[0021] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0022] Figure 1 A three-dimensional structural diagram of a target device used in posterior cervical pedicle screw fixation surgery.

[0023] Figure 2 for Figure 1 Enlarged 3D structural diagram at point A;

[0024] Figure 3 An exploded view of the three-dimensional structure for the engagement of the snap-fit ​​component and the limiting component;

[0025] Figure 4 This is a magnified three-dimensional structural diagram of a partial cross-section of the snap-fit ​​assembly;

[0026] Figure 5 A magnified three-dimensional structural diagram of the first state of the engagement between the limiting component and the pedicle screw;

[0027] Figure 6 A magnified three-dimensional structural diagram of the second state of the engagement between the limiting component and the pedicle screw;

[0028] Figure 7 A magnified three-dimensional structural diagram of the first state of the limiting component;

[0029] Figure 8 A magnified three-dimensional structural diagram of the second state of the limiting component;

[0030] Figure 9 This is an enlarged three-dimensional schematic diagram of the limiting pin;

[0031] Figure 10 This is a magnified cross-sectional view of the three-dimensional structure of the limiting pin.

[0032] Figure label:

[0033] 1. Target body; 2. Alignment point; 3. Slot; 4. Guide wire; 5. Pre-pass component; 6. Locking block; 7. Positioning sleeve; 8. Arc-shaped groove; 9. Limiting pin; 10. Angled protrusion; 11. Circular groove; 12. Opening; 13. Sphere; 14. Connecting rod; 15. Pedicle screw; 16. Hollow channel; 17. Rotating handle; 18. Pushing handle; 19. Locking groove.

[0034] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0035] The following is a detailed description of a target device for posterior cervical pedicle screw fixation provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0036] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0037] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0038] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0039] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0040] like Figures 1 to 10 As shown, an embodiment of the present invention provides a target device for posterior cervical pedicle screw fixation surgery, including a target device body 1. A snap-fit ​​component is fixedly connected to one end of the target device body 1. The snap-fit ​​component is used to snap and fix the target device body 1, and the snap-fit ​​component is connected to the target device body 1. A limiting component is used to assist the target device in fitting with the bone surface, and the limiting component is connected to the snap-fit ​​component. The target device for posterior cervical pedicle screw fixation surgery provided in this application is suitable for situations requiring precise screw placement. It assists the guide wire 4 and screws in being placed along a safe path, reducing the risk of nerve and blood vessel injury and improving screw placement accuracy. The working principle of the target device is disclosed as prior art and will not be described in detail. By setting the snap-fit ​​component and the limiting component, the snap-fit ​​component can not only improve the stability of the overall device, but also facilitate disassembly, thus making it easier to independently cooperate with the pedicle screw 15. The limiting component can not only provide stable triangular fixation to the bone surface, but also can be used on uneven bone surfaces, ensuring that the limiting component fits tightly with the bone surface, so that the target device maintains a stable holding force and prevents displacement during operation.

[0041] As one implementation method in this embodiment, such as Figures 1 to 10As shown, the snap-fit ​​assembly includes a snap-fit ​​groove 19 formed at one end of the target body 1, an alignment point 2 formed on the side of the snap-fit ​​groove 19 near the outer wall of the target body 1, and a snap-fit ​​groove 3 (such as...) formed at the bottom of the snap-fit ​​groove 19. Figure 4 As shown), the alignment point 2 is connected to the slot 3, and a guide wire 4 is inserted into one end of the target body 1 (as shown). Figure 4 (As shown). A limiting component is engaged on the inner wall of the snap-fit ​​groove 19. The limiting component includes a pre-through member 5 engaged on the inner wall of the snap-fit ​​groove 19. The pre-through member 5 has a hollow structure, and its wall thickness is adapted to the inner wall dimension of the snap-fit ​​groove 19. A uniformly distributed snap-fit ​​block 6 (as shown) is fixedly connected to one end of the pre-through member 5 near the snap-fit ​​groove 19. Figure 3 As shown), the positions of the locking block 6 and the alignment point 2 correspond one-to-one. The outer contour dimensions of the locking block 6 are adapted to the inner wall dimensions of the alignment point 2, the thickness of the locking block 6 is adapted to the inner wall dimensions of the locking groove 3, and the dimension of the locking block 6 protruding from the outer wall of the pre-pass component 5 is consistent with the outer contour dimensions of the positioning sleeve 7. The other end of the pre-pass component 5 is threaded with a positioning sleeve 7, and the end of the positioning sleeve 7 away from the locking block 6 has evenly distributed arc-shaped grooves 8. Figure 2 and Figures 9 to 10 As shown, a connecting rod 14 is fixedly connected to the inner wall of the arc-shaped groove 8. A limiting pin 9 is rotatably connected to the bottom of the connecting rod 14. An oblique protrusion 10 is fixedly connected to one side of the limiting pin 9, and the oblique protrusion 10 forms an angle with the limiting pin 9 (e.g., ...). Figure 10 As shown, the limiting pin 9 and the oblique protrusion 10 are manufactured as a single piece. The top of the connecting rod 14 is fixedly connected to the positioning sleeve 7. The connecting rod 14 passes through the inner wall of the arc-shaped groove 8. A ball 13 is fixedly connected to the bottom of the connecting rod 14. A circular groove 11 is provided at the intersection of the limiting pin 9 and the oblique protrusion 10. The inner diameter of the circular groove 11 is larger than the outer diameter of the ball 13. An opening 12 is provided at the top of the circular groove 11. The opening 12 communicates with the circular groove 11. The inner diameter of the opening 12 is larger than the outer diameter of the connecting rod 14.

[0042] Specifically, first, align the locking block 6 with the alignment point 2 and press it towards the slot 3, so that the locking block 6 reaches the inner wall of the slot 3. Then, rotate the pre-pass component 5 so that the locking block 6 is misaligned with the alignment point 2, thus achieving the connection between the pre-pass component 5 and the target body 1 (e.g., Figures 1 to 2 (As shown); A rotating handle 17 is provided at the other end of the target body 1, and a push handle 18 is inserted into the target body 1 near the rotating handle 17 (as shown). Figure 1As shown, rotating the rotating handle 17 can drive the pre-pass component 5 to move synchronously. The pre-pass component 5 and the positioning sleeve 7 are threadedly connected. The relative position of the pre-pass component 5 and the positioning sleeve 7 can be adjusted by rotating the rotating handle 17 clockwise or counterclockwise. When it is necessary to separate the pre-pass component 5 from the target body 1, rotate the target body 1 so that the alignment point 2 corresponds one-to-one with the locking block 6, and pull the target body 1 outward to separate the target body 1 from the pre-pass component 5.

[0043] By setting up the alignment point 2, the slot 3, and the locking block 6, during connection, the alignment point 2 and the locking block 6 are aligned and rotated into place, eliminating the need for precise alignment of threads and other complex structures, saving intraoperative time and improving operational efficiency. During disassembly, the alignment point 2 and the locking block 6 are rotated again to separate them, making the operation convenient and avoiding the problem of inconvenient operation due to the small size of the pre-circuit component 5 and the positioning sleeve 7. It can be connected in conjunction with the existing tool target body 1, and the target body 1 can be used to adjust the fit requirements between the pre-circuit component 5 and the positioning sleeve 7, ensuring that the fixation surgery is carried out efficiently and smoothly.

[0044] Further, firstly, using a drilling tool, holes are drilled at the pre-planned insertion point of guidewire 4. Then, the positioning sleeve 7 is placed at the surgical site, with its bottom aligned with the drilled hole. Next, according to the program-designed markings on the target body 1, the direction and angle of the target body 1 are adjusted to conform to the preset path of guidewire 4. After alignment, the user holds the outer wall of the positioning sleeve 7 with one hand and rotates the rotating handle 17 counterclockwise and clockwise with the other hand to facilitate the insertion of the limiting nail 9 into the bone surface, ensuring the connection between the positioning sleeve 7 and the bone surface. This continues until the bottom of the positioning sleeve 7 contacts the bone surface. At this point, rotating the rotating handle 17 clockwise causes the pre-pass component 5 to move downwards. The length of the pre-pass component 5 is greater than the preset depth. The pre-pass component 5 continues to move closer to the bone surface. When the bottom of the pre-pass component 5 encounters the limiting nail 9, it will compress the oblique protrusion 10, causing the limiting nail 9 to obliquely penetrate the bone surface (e.g., Figure 7 As shown), continue to rotate the handle 17 to insert the pre-through member 5 into the bone until the preset depth is reached. Since the ball 13 is rotatably connected inside the circular groove 11, when the pre-through member 5 presses the oblique protrusion 10 downward, the limiting nail 9 is pressed from vertically into the bone surface to obliquely into the bone surface. The positioning sleeve 7 has a certain height to facilitate the grip of medical staff. The threads on the inner wall of the positioning sleeve 7 are compatible with the threads on the outer wall of the pre-through member 5. The thread adjustment method is more labor-saving and has stronger fixation. The inner diameter of the pre-through member 5 is larger than the outer diameter of the guide wire 4, the diameter of the opening 12 is smaller than the outer diameter of the ball 13, and the diameter of the opening 12 is larger than the diameter of the bottom of the connecting rod 14. The bottom of the connecting rod 14 is a certain distance from the top of the arc groove 8 to prevent the limiting nail 9 from contacting the bottom of the positioning sleeve 7 when rotating, thus improving the durability of the structure.

[0045] By setting the limiting nail 9 and the oblique protrusion 10 together, there is an angle between the oblique protrusion 10 and the limiting nail 9. The pre-passing part 5 is used to squeeze the oblique protrusion 10, forcing the limiting nail 9 to expand and obliquely insert into the bone surface. The oblique fixation can increase the contact area and friction between the limiting nail 9 and the bone tissue, which is beneficial to improving the stability of fixation.

[0046] Furthermore, after the guide wire 4 is inserted, push the push handle 18 to insert the guide wire 4 along the pre-pass component 5. After the pre-pass component 5 is successfully inserted, rotate the rotating handle 17 counterclockwise to move the pre-pass component 5 out of the vertebral body. When the pre-pass component 5 passes through the limiting nail 9, because the oblique protrusion 10 loses the compression of the pre-pass component 5, the tip of the limiting nail 9 will tend to move closer to the center of the positioning sleeve 7. Then, hold the pre-pass component 5 and rotate the target body 1 to separate the pre-pass component 5 from the target body 1. Next, prepare to insert the pedicle screw 15. Because the pedicle screw 15 has a hollow channel 16 inside, the inner diameter of the hollow channel 16 is larger than the outer diameter of the positioning sleeve 7 (e.g., Figure 5 As shown), since the pre-circuit member 5 is sleeved on the outside of the guide wire 4 and is concentrically set with the guide wire 4, the pre-circuit member 5 protruding from the bone surface is equivalent to the extension line of the guide wire 4. The pedicle screw 15 is inserted into the bone along the pre-circuit member 5, making it easier to determine the angle of the pedicle screw 15. When the pedicle screw 15 contacts the limiting screw 9, the pedicle screw 15 is continuously driven in. Under the pressure of the pedicle screw 15, the limiting screw 9 rotates and retracts towards the axis of the positioning sleeve 7 until the limiting screw 9 is completely separated from the bone surface. When the limiting screw 9 is squeezed until it is completely retracted into the interior of the positioning sleeve 7 (as shown...), Figure 6 and Figure 8 As shown), the tips of the three limiting screws 9 do not contact each other, that is, there is no squeezing between the limiting screws 9. At this time, the pre-through part 5 and the positioning sleeve 7 are retracted into the tool for driving in the pedicle screw 15 until the pedicle screw 15 is driven to the target depth.

[0047] By setting the circular groove 11 and the ball 13 to cooperate, the limiting nail 9 can rotate around the bottom of the connecting rod 14 when subjected to external pressure. This not only changes the angle of insertion into the bone surface and improves the stability of fixation, but also facilitates the separation of the limiting nail 9 from the bone surface during the insertion process of the pedicle screw 15, thus improving the overall efficiency of the operation.

[0048] The working principle of the technical solution provided by this invention is as follows:

[0049] In use, first use a drilling tool to drill holes at the pre-planned guidewire 4 insertion points. Then, place the positioning sleeve 7 on the surgical site, aligning its bottom with the drilled hole. Next, adjust the direction and angle of the target body 1 according to the program-designed markings on the target body 1 to conform to the preset path of the guidewire 4. After alignment, the user holds the outer wall of the positioning sleeve 7 with one hand and rotates the rotating handle 17 counterclockwise and clockwise with the other hand to facilitate the insertion of the limiting nail 9 into the bone surface until the bottom of the positioning sleeve 7 contacts the bone surface. At this point, rotate the rotating handle 17 clockwise, and the pre-circuit member 5 continues to move closer to the bone surface. When the bottom of the pre-circuit member 5 encounters the limiting nail 9, it will produce a force on the oblique protrusion 10. The compression forces the limiting nail 9 to diagonally penetrate the bone surface. By coordinating the limiting nail 9 and the diagonal protrusion 10, an angle is formed between the protrusion 10 and the limiting nail 9. The pre-drilled component 5 compresses the diagonal protrusion 10, forcing the limiting nail 9 to expand and diagonally penetrate the bone surface. This diagonal fixation increases the contact area and friction between the limiting nail 9 and the bone tissue, improving fixation stability. The rotating handle 17 is then continuously rotated to insert the pre-drilled component 5 into the bone until a preset depth is reached. The push handle 18 is then pushed to insert the guide wire 4 along the pre-drilled component 5. After successful insertion, the rotating handle 17 is rotated counterclockwise to remove the pre-drilled component 5 from the vertebral body. The pre-drilled component 5 passes through the limiting nail. At 9 o'clock, because the oblique protrusion 10 loses the compression of the pre-channel component 5, the tip of the limiting screw 9 will tend to move closer to (close) the axis of the positioning sleeve 7. Then, manually rotate the target body 1 while holding the pre-channel component 5 to separate the pre-channel component 5 from the target body 1. Next, prepare to insert the pedicle screw 15. The pre-channel component 5 protruding from the bone surface is equivalent to the extension line of the guide wire 4. Insert the pedicle screw 15 into the bone along the pre-channel component 5 to make it easier to determine the angle of the pedicle screw 15. When the pedicle screw 15 contacts the limiting screw 9, continue to drive the pedicle screw 15. Under the compression of the pedicle screw 15, the limiting screw 9 rotates towards the center of the positioning sleeve 7 until the limiting screw 9 is completely in contact with the bone surface. Separation: At this time, the pre-connected part 5 and the positioning sleeve 7 are retracted into the tool for inserting the pedicle screw 15 until the pedicle screw 15 is driven to the target depth. By setting the circular groove 11 and the ball 13 to cooperate, the limiting nail 9 can rotate around the bottom of the connecting rod 14 when subjected to external pressure. This not only changes the angle of insertion into the bone surface and improves the stability of fixation, but also facilitates the separation of the limiting nail 9 from the bone surface during the insertion process of the pedicle screw 15, thus improving the overall efficiency of the operation. By using the cooperation of the locking block 6 and the alignment point 2, during connection, the alignment point 2 and the locking block 6 are aligned and rotated to lock in, eliminating the need for complex structures such as fine alignment of threads, saving intraoperative time and improving operational efficiency.During disassembly, simply rotate the device again to align the alignment point 2 with the locking block 6 for easy separation. This convenient operation avoids the problem of inconvenient operation caused by the small size of the pre-draining component 5 and the positioning sleeve 7. It connects with the existing tool target body 1, using the target body 1 to adjust the fit between the pre-draining component 5 and the positioning sleeve 7. This not only improves the overall stability of the device but also facilitates disassembly, making it easier to independently engage with the pedicle screw 15. Furthermore, the three limiting screws 9 not only provide stable triangular fixation to the bone surface but also accommodate uneven bone surfaces, ensuring a tight fit between the positioning sleeve 7 and the bone surface. This allows the target to maintain a stable holding force and prevents displacement during operation.

[0050] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A targeting device for posterior cervical pedicle screw fixation, comprising a targeting device body, characterized in that, One end of the target body is fixedly connected to a snap-fit ​​component, which is used to snap and fix the target body. The snap-fit ​​component is connected to the target body, and a limiting component is connected to the snap-fit ​​component. The limiting component assists in the fit of the target to the bone surface. The snap-fit ​​assembly includes a snap-fit ​​groove formed at one end of the target body, an alignment point formed on the side of the snap-fit ​​groove near the outer wall of the target body, a snap-fit ​​slot formed at the bottom of the snap-fit ​​groove, a guide wire inserted into one end of the target body, and a limiting component snapped onto the inner wall of the snap-fit ​​groove; the positions of the snap-fit ​​block and the alignment point correspond one-to-one, the outer contour size of the snap-fit ​​block is adapted to the inner wall size of the alignment point, and the alignment point communicates with the snap-fit ​​slot; The limiting component includes a pre-pass component that is snapped onto the inner wall of the snap-fit ​​groove. A uniformly distributed snap-fit ​​block is fixedly connected to one end of the pre-pass component near the snap-fit ​​groove. A positioning sleeve is threaded onto the other end of the pre-pass component. A uniformly distributed arc-shaped groove is opened at the end of the positioning sleeve away from the snap-fit ​​block. A connecting rod is fixedly connected to the inner wall of the arc-shaped groove. A limiting pin is rotatably connected to the bottom of the connecting rod. The pre-through component has a hollow structure, and the wall thickness of the pre-through component is adapted to the inner wall size of the snap-fit ​​groove; The top of the connecting rod is fixedly connected to the positioning sleeve, the connecting rod passes through the inner wall of the arc-shaped groove, and a ball is fixedly connected to the bottom of the connecting rod; A slanted protrusion is fixedly connected to one side of the limiting pin, and the slanted protrusion forms an angle with the limiting pin. The size of the card block protruding from the outer wall of the pre-pass component is consistent with the outer contour size of the positioning sleeve; Turn the rotating handle, and the pre-circuit will continue to move closer to the bone surface. When the bottom of the pre-circuit encounters the limiting pin, it will squeeze the oblique protrusion, causing the limiting pin to diagonally penetrate the bone surface. By setting the limiting pin and the oblique protrusion to cooperate, there is an angle between the oblique protrusion and the limiting pin. The pre-circuit will squeeze the oblique protrusion, forcing the limiting pin to expand and diagonally penetrate the bone surface. The oblique fixation can increase the contact area and friction between the limiting pin and the bone tissue, which is beneficial to improving the stability of fixation. Continue to turn the rotating handle until the pre-circuit is inserted into the bone until the preset depth is reached. Then push the push handle to insert the guide wire along the pre-circuit. After the pre-circuit is successfully inserted, rotate it counterclockwise.

2. The targeting device for posterior cervical pedicle screw fixation according to claim 1, characterized in that, The thickness of the card block is adapted to the inner wall size of the card slot.

3. The targeting device for posterior cervical pedicle screw fixation according to claim 1, characterized in that, The limiting pin and the oblique protrusion are manufactured as a single unit.

4. The targeting device for posterior cervical pedicle screw fixation according to claim 3, characterized in that, A circular groove is formed at the intersection of the limiting pin and the oblique protrusion, and the inner diameter of the circular groove is larger than the outer diameter of the sphere.

5. The targeting device for posterior cervical pedicle screw fixation according to claim 4, characterized in that, The top of the circular groove has an opening that communicates with the circular groove, and the inner wall dimension of the opening is larger than the outer wall dimension of the connecting rod.

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