Spine vertebral pedicle positioning needle with claw groove structure

Abstract

The invention belongs to the technical field of medical apparatus and instruments, and mainly provides a spine vertebral pedicle positioning needle with a claw groove structure, the spine vertebral pedicle positioning needle comprises a needle body, a cavity is arranged in the needle body, the cavity is provided with a connecting port and two jacking ports, two jacking pieces are slidably arranged in the cavity, and the two jacking pieces extend out of the jacking ports respectively; grooves are formed in the two jacking parts, two first wedge surfaces are arranged in the grooves, an adjusting part and a rotating part are arranged in the cavity, the rotating part extends out of the connecting port, the adjusting part is provided with a first limiting surface and a second wedge surface, the second wedge surface is in wedge-shaped fit with the first wedge surface, the first limiting surface is in limiting contact with the cavity wall of the cavity, and the adjusting part moves downwards to enable the two jacking parts to be away from each other; and a jacking spring is arranged in the cavity and is used for jacking and pressing the jacking and holding pieces on the corresponding sides respectively. The first wedge face and the second wedge face form a wedge-shaped matching structure, the adjusting piece moves downwards, extrusion force of the wedge-shaped face can synchronously act on the two jacking pieces, the two jacking pieces are driven to be away from each other, stretch out of the jacking openings and symmetrically abut against the inner wall of the nail channel, and the stability of the needle body in the nail channel is improved.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a spinal pedicle positioning needle with a claw groove structure. Background Technology

[0002] Since its introduction in the 1980s, pedicle screw (PS) surgery has developed rapidly and is now widely used in the surgical treatment of spinal degenerative diseases, vertebral slippage, spinal stenosis, vertebral fractures, deformities, bone metastases, and spinal instability. Literature reports that pedicle screw surgery in cervical spine surgery offers reliable biomechanical advantages and a high rate of bone fusion.

[0003] Before inserting pedicle screws, to ensure accurate positioning, the screw hole usually needs to be positioned using a positioning pin or other positioning tools. For example, Chinese patent document CN206934166U discloses a pedicle screw positioning pin, which includes a positioning pin body, a positioning pin head, a positioning pin tail, and a tail fin disposed between the two. The positioning pin head is conical, and the front end of the positioning pin head is formed by rounding. A transition part is provided at the rear end of the positioning pin head, and the surface of the transition part is formed by frosting. The transition part is used to increase the friction between the positioning pin and the screw track. The rear end of the positioning pin tail is provided with an observation part, which is a flattened spherical or cylindrical structure. The observation part is used for identification and differentiation of front and side views during fluoroscopy. The positioning pin body is a one-piece molded structure.

[0004] While the above-mentioned technology achieves a certain degree of effectiveness in locating pedicle screws, the connection stability between the positioning pin and the screw track is not guaranteed because the positioning pin is only limited by the frosted outer ring surface of the transition section. In other words, the positioning pin is not fixed and is prone to detaching from the screw track. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a spinal pedicle positioning pin with a claw groove structure to solve the problem that the positioning pin cannot be stably fixed in the pin channel in the prior art.

[0006] To achieve the above and other related objectives, the present invention provides a spinal pedicle positioning needle with a claw groove structure, comprising a needle body, wherein the needle body has a cavity, the cavity has a connection port and two support ports arranged opposite to each other on the side wall of the needle body, and two support members are slidably assembled in the cavity, the two support members being used to extend from the support ports on the corresponding sides respectively. The two top-holding members are provided with grooves, and the grooves have two first wedge surfaces with opposite inclination directions. The cavity is provided with an adjusting member and a rotating member that are threaded together. The rotating member extends out from the connection port. The adjusting member has a first limiting surface and two second wedge surfaces with opposite inclination directions. The second wedge surfaces are wedge-shaped and engage with the first wedge surfaces. The first limiting surface is used to limit contact with the cavity wall to restrict the rotation of the adjusting member. When the rotating member rotates, it causes the adjusting member to move in the vertical direction. The adjusting member moves down and causes the two top-holding members to move away from each other, so that they extend out from the top-holding ports on the corresponding sides and press against the inner wall of the nail channel. The cavity is provided with top springs, which press against the top-holding members on the corresponding sides to bring them closer together.

[0007] In some embodiments of the present invention, each of the top holding members includes a top holding block and a retraction claw fixedly connected together. The top holding block is slidably assembled in the cavity, and the retraction claw is located on the outside of the top holding block. The retraction claw is used to extend from the top holding opening on the corresponding side and press against the inner wall of the nail channel.

[0008] In some embodiments of the present invention, the claw tip of the blocking claw is tilted upward.

[0009] In some embodiments of the present invention, one of the top holding blocks is fixed with a guide rod, and the other top holding block is provided with a guide hole, and the guide rod slides within the guide hole.

[0010] In some embodiments of the present invention, the adjusting member includes a threaded rod and an adjusting block fixedly connected together, the threaded rod being threadedly connected to the rotating member, and two second wedge surfaces being located on the adjusting block.

[0011] In some embodiments of the present invention, the upper end of the rotating member has a connecting portion, and the connecting portion has a first stop surface; The rotating component is connected to an observation component, which has a connecting groove and a second stop surface inside the connecting groove. The connecting part is located inside the connecting groove, and the first stop surface and the second stop surface are in contact to stop the rotation. Rotating the observation component causes the rotating component to rotate.

[0012] In some embodiments of the present invention, the observation member has a mounting groove, a connecting cylinder is provided in the mounting groove, the connecting groove is located inside the connecting cylinder, and the upper end of the needle body is located in the mounting groove; The upper outer surface of the needle body has a connecting ring, and the groove wall of the mounting groove has a receiving groove for placing the connecting ring.

[0013] In some embodiments of the present invention, a limiting ring is fixed on the needle body, the limiting ring being located above the top holder and below the observation member.

[0014] In some embodiments of the present invention, a sealing ring is provided on the lower side of the limiting ring.

[0015] In some embodiments of the present invention, the lower end of the needle body is an insertion part, and the insertion part has a round head structure.

[0016] As described above, the present invention has the following beneficial effects: The top holding member of the present invention has a first wedge surface with opposite inclination, and the adjusting member has a matching second wedge surface with opposite inclination. The first and second wedge surfaces on the corresponding sides have the same inclination direction, forming a wedge-shaped mating structure. When the adjusting member moves down, the squeezing force of the wedge surface will act synchronously on the two oppositely arranged top holding members, driving them to move away from each other and extend synchronously from the top holding opening, and symmetrically press against the opposite sides of the inner wall of the nail channel. This design enables the top holding member to form a surface contact pressing effect with the inner wall of the nail channel, thereby achieving stable fixation of the needle body in the nail channel. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic representation of the structure of the present invention. Figure 2 The diagram shown is a cross-sectional view of the present invention. Figure 3 Displayed as Figure 2 Enlarged view of point A in the middle; Figure 4 The diagram shows the structure of the top support component. Figure 5 Shown is a partial sectional view of the top support component; Figure 6 The diagram shows the structure of the adjusting component. Figure 7 The diagram shown is a structural schematic of the needle.

[0018] Explanation of icon numbers: 1. Needle body; 2. Insertion part; 3. Limiting ring; 4. Top holding block; 5. Retracting claw; 6. Adjusting block; 7. Threaded rod; 8. Top spring; 9. Rotating part; 10. Observation piece; 11. Connecting part; 12. Connecting cylinder; 13. Connecting ring; 14. Sealing ring; 15. Guide rod; 16. Cavity; 17. Mounting groove; 18. Connecting groove; 19. Top pressing part; 20. Guide hole; 21. Groove; 22. First limiting surface; 23. Second wedge surface; 24. Top holding port; 25. Connecting port; 26. First stop surface. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] Please see Figure 1-7 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] like Figures 1-4 As shown, the present invention provides a spinal pedicle positioning needle with a claw groove structure, comprising a cylindrical needle body 1, a cavity 16 inside the needle body 1, a connection port 25 and two opposing support ports 24 arranged on the side walls of the needle body 1, the connection port 25 extending from the upper end face of the needle body 1. Two opposing support members are slidably fitted inside the cavity 16, the two support members extending from the corresponding support ports 24 to press against the inner wall of the pin channel.

[0022] like Figures 1-4 As shown, the cavity 16 contains an adjusting member and a rotating member 9 threaded together. The rotating member 9 extends from the connection port 25, allowing it to extend beyond the needle body 1 and rotate. Two support members have grooves 21 containing two first wedge surfaces with opposite inclination directions. The adjusting member has a first limiting surface 22 and two second wedge surfaces 23 with opposite inclination directions. The first and second wedge surfaces 23 on corresponding sides have the same inclination direction. The second wedge surfaces 23 wedge-shapedly engage with the first wedge surfaces. The first limiting surface 22 makes limiting contact with the cavity wall of the cavity 16 to restrict the rotation of the adjusting member. This converts the rotational motion of the rotating member 9 into linear motion of the adjusting member, preventing deviation during transmission and ensuring stable downward movement of the adjusting member along a fixed direction. This provides continuous power for the pressing action of the support members and ensures the stability of the support. Rotating component 9 rotates, causing adjusting component to move in the up-down direction. As adjusting component moves down, the squeezing force of the first wedge surface and the second wedge surface 23 will act synchronously on the two oppositely arranged top holding components, causing the two top holding components to move away from each other, so that they extend synchronously from the top holding opening 24 on the corresponding side and press against the opposite sides of the inner wall of the nail channel, thereby achieving stable fixation of the needle body 1 in the nail channel.

[0023] Meanwhile, in this embodiment, the spinal pedicle positioning pin can adapt to different diameter channels through the extension of the two supporting members, thus solving the defect in the prior art where the same positioning pin cannot adapt to channels of different diameters. The extension distance of the supporting members is determined by the downward movement distance of the adjusting member. By rotating the rotating member 9, the downward movement stroke of the adjusting member can be flexibly adjusted, thereby adjusting the outward extension distance of the two supporting members to adapt to channels of different diameters. By adjusting, the supporting members are tightly pressed against the inner wall of the channel, avoiding the pressure gap caused by the deviation of the channel size, solving the problem of insufficient pressure of the positioning pin in different channels, and further ensuring the stable fixation of the positioning pin in various channels.

[0024] like Figures 4-6 As shown, to facilitate the repositioning of the support members and the removal of the needle body 1 from the nail channel, both support members are provided with a pressing part 19, which is located on the side of the support member away from the inner wall of the cavity 16. Two top springs 8 are provided inside the cavity 16. One end of each top spring 8 presses against the inner wall of the cavity 16, and the other end presses against the corresponding pressing part 19. When the spinal pedicle positioning needle is not needed, the rotating member 9 rotates in the opposite direction, causing the first wedge surface and the second wedge surface 23 to no longer contact each other. The two support members will then move closer to each other under the pressing action of the two top springs 8, causing the support members to retract from the support opening 24 into the cavity 16 and no longer press against the inner wall of the nail channel.

[0025] like Figures 1-6 As shown, in some embodiments of the present invention, each supporting member includes a supporting block 4 and a retracting claw 5 fixedly connected together. The supporting block 4 is slidably fitted into the cavity 16, and the pressing part 19 is located on the side of the supporting block 4 away from the inner wall of the cavity 16. The restoring force of the top spring 8 can be transmitted to the retracting claw 5 through the supporting block 4, ensuring that when the adjusting member moves upward, the retracting claw 5 can smoothly retract into the cavity 16 under the action of the top spring 8, without affecting the operation of removing the positioning pin from the nail channel. The retracting claw 5 is located on the outside of the supporting block 4, and the retracting claw 5 is used to extend from the supporting opening 24 on the corresponding side and press against the inner wall of the nail channel. The outer surface of the retracting claw 5 has anti-slip texture. When the retracting claw 5 presses against the inner wall of the nail channel, the anti-slip texture will contact the inner wall of the nail channel, increasing the friction between the retracting claw 5 and the inner wall of the nail channel under the same pressing force, thereby improving the stability of the needle body 1 in the nail channel.

[0026] In some embodiments of the present invention, the tip of the retraction claw 5 is tilted upwards. This way, when the needle body 1 unexpectedly retracts outside the pedicle, the end of the retraction claw 5 furthest from the holding block 4 gradually opens outwards, further enhancing the retraction effect of the holding block 4 on the pedicle. Spinal pedicle localization surgery requires high operational precision; even slight retraction or displacement of the positioning needle can lead to deviations in the subsequent pedicle drilling and screw implantation positions, thereby increasing surgical risks. The upward-tilted retraction claw 5 ensures that the positioning needle remains in the preset pedicle position, avoiding surgical errors caused by positioning deviations and improving the safety and accuracy of spinal pedicle localization surgery.

[0027] like Figures 4-6 As shown, in some embodiments of the present invention, one of the top holding blocks 4 is fixed with a guide rod 15, and the other top holding block 4 is provided with a guide hole 20. The axes of the guide rod 15 and the guide hole 20 are both consistent with the moving direction of the top holding block 4. The guide rod 15 slides within the guide hole 20, so that the two top holding blocks 4 can only move parallel to each other in the horizontal direction of approaching or moving away from each other, and cannot deviate. This makes the movement of the two top holding blocks 4 smoother and more stable, and also enables the top holding blocks 4 to always maintain a synchronous and equidistant moving state under the drive of the wedge surface, ensuring the smoothness of the pressing action.

[0028] like Figure 3 As shown, in some embodiments of the present invention, the adjusting member includes a threaded rod 7 and an adjusting block 6 fixedly connected together. The threaded rod 7 is threadedly connected to a rotating member 9. When the rotating member 9 rotates, it drives the threaded rod 7 to move in the up-down direction. The first limiting surface 22 and the two second wedge surfaces 23 are both located on the adjusting block 6.

[0029] like Figures 4-7 As shown, in some embodiments of the present invention, the upper end of the rotating member 9 has a connecting portion 11, and the connecting portion 11 has a first stop surface 26. The rotating member 9 is connected to an observation member 10, which has a connecting groove 18 and a second stop surface within the connecting groove 18. The connecting portion 11 is located within the connecting groove 18, and the first stop surface 26 is in contact with the second stop surface for a stop. Rotating the observation member 10, through the stop engagement of the first stop surface 26 and the second stop surface, synchronously drives the rotating member 9 to rotate. The observation member 10 facilitates the user's ability to drive the rotating member 9 to rotate.

[0030] In this embodiment, the observation element 10 can be designed in various shapes to correspond to different nail tracks, making it easy for users to know the type of nail track by observing the shape of the observation element 10. At the same time, the observation element 10 can be designed in various easy-to-grip and easy-to-apply force structures, increasing the force application surface and allowing users to rotate and operate it easily and stably.

[0031] like Figures 4-7As shown, in some embodiments of the present invention, the observation piece 10 has a mounting groove 17, a connecting cylinder 12 is provided in the mounting groove 17, a connecting groove 18 is located in the connecting cylinder 12, and the upper end of the needle body 1 is located in the mounting groove 17. The outer side of the upper end of the needle body 1 has a connecting ring 13, and the groove wall of the mounting groove 17 has a receiving groove for placing the connecting ring 13. The connecting ring 13 at the upper end of the needle body 1 is engaged in the receiving groove of the mounting groove 17 of the observation piece 10, which restricts the axial disengagement movement of the observation piece 10. Under normal operation, static conditions, slight vibration, and other non-forced conditions, the observation piece 10 can be firmly locked, which facilitates the limiting of the observation piece 10 and prevents the observation piece 10 from automatically falling off from the connecting part 11 when the user does not apply force.

[0032] like Figures 1-4 As shown, in some embodiments of the present invention, a limiting ring 3 is fixed on the needle body 1, and the limiting ring 3 is located above the top support and below the observation member 10. When the needle body 1 is inserted into the nail channel until the limiting ring 3 is in contact with the vertebral bone surface, it will be directly blocked and cannot be inserted further. In this way, the limiting ring 3 restricts the depth of the needle body 1 inserted into the nail channel, which makes it easier for the user to control the depth of insertion and avoids the safety hazard of excessive insertion.

[0033] like Figures 1-4 As shown, in some embodiments of the present invention, a sealing ring 14 is provided on the lower side of the limiting ring 3. The sealing ring 14 on the lower side of the limiting ring 3 is a flexible elastic structure, such as silicone or rubber. When the limiting ring 3 is rigidly attached to the vertebral bone surface, the sealing ring 14 will undergo elastic deformation under the action of extrusion force, completely conforming to the concave and convex texture of the bone surface, forming an annular seal between the needle body 1 and the pin channel opening, sealing the gap between the pin channel and the needle body 1, preventing blood from seeping out from the pin channel opening, and reducing local blood loss during the operation.

[0034] In some embodiments of the present invention, the lower end of the needle body 1 is an insertion part 2, which has a rounded head structure. The arc-shaped outer surface of the rounded head structure reduces the frictional resistance and contact force between the needle body 1 and the nail channel, allowing the user to smoothly push the needle body 1 into the nail channel with only a small amount of force, which is more conducive to the insertion of the needle body 1. Furthermore, the rounded head structure is a smooth structure without sharp corners or edges, which will not cause scratching to the inner wall of the nail channel during implantation, effectively protecting the bone surface structure within the nail channel, reducing bone fragment production, and reducing surgical trauma during the needle body 1 implantation process.

[0035] In some embodiments of the present invention, the needle body 1 and the limiting ring 3 are made of an X-ray opaque metal material, such as stainless steel or titanium alloy.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A pedicle positioning needle for a spinal pedicle with a claw groove structure, characterized by, Includes a needle body (1), the needle body (1) has a cavity (16), the cavity (16) has a connection port (25) and two top holding ports (24) arranged opposite to each other on the side wall of the needle body (1), and two top holding members are slidably assembled in the cavity (16), the two top holding members are respectively used to extend from the top holding ports (24) on the corresponding side; The two top holding members are provided with grooves (21), and the grooves (21) have two first wedge surfaces with opposite inclination directions. The cavity (16) is provided with an adjusting member and a rotating member (9) that are threaded together. The rotating member (9) extends out from the connection port (25). The adjusting member has a first limiting surface (22) and two second wedge surfaces (23) with opposite inclination directions. The second wedge surface (23) is wedge-shaped and fits with the first wedge surface. The first limiting surface (22) is used to limit contact with the cavity wall of the cavity (16) to restrict the rotation of the adjusting member. The rotating member (9) rotates, causing the adjusting member to move in the up and down direction. The adjusting member moves down, causing the two top holding members to move away from each other, so that they extend out from the top holding port (24) on the corresponding side and press against the inner wall of the nail channel. The cavity (16) is provided with a top spring (8), which presses against the top holding members on the corresponding side, so that they move closer to each other.

2. The pedicle positioning needle with a claw slot structure according to claim 1, wherein, Each of the aforementioned top-holding components includes a top-holding block (4) and a retaining claw (5) fixedly connected together. The top-holding block (4) is slidably fitted in the cavity (16), and the retaining claw (5) is located on the outside of the top-holding block (4). The retaining claw (5) is used to extend from the top-holding opening (24) on the corresponding side and press against the inner wall of the nail channel.

3. The pedicle positioning needle with a claw slot structure according to claim 2, wherein, The claw tip of the blocking claw (5) is tilted upward.

4. The pedicle positioning needle with a claw slot structure according to claim 2, wherein, One of the top holding blocks (4) is fixed with a guide rod (15), and the other top holding block (4) is provided with a guide hole (20), and the guide rod (15) slides in the guide hole (20).

5. The spinal pedicle positioning pin with claw groove structure according to claim 1, characterized in that, The adjusting component includes a threaded rod (7) and an adjusting block (6) fixedly connected together. The threaded rod (7) is threadedly connected to the rotating component (9), and the two second wedge surfaces (23) are located on the adjusting block (6).

6. The pedicle screw of claim 1, wherein the slot is a J-shaped slot. The upper end of the rotating part (9) has a connecting part (11), and the connecting part (11) has a first stop surface (26). The rotating part (9) is connected to the observation part (10). The observation part (10) has a connecting groove (18). The connecting groove (18) has a second stop surface. The connecting part (11) is located in the connecting groove (18). The first stop surface (26) fits against the second stop surface to stop. Rotating the observation part (10) causes the rotating part (9) to rotate.

7. The pedicle positioning needle with a claw slot structure according to claim 6, wherein, The observation piece (10) has a mounting groove (17), a connecting cylinder (12) is provided in the mounting groove (17), the connecting groove (18) is located in the connecting cylinder (12), and the upper end of the needle body (1) is located in the mounting groove (17); The upper outer side of the needle body (1) has a connecting ring (13), and the groove wall of the mounting groove (17) has a receiving groove for placing the connecting ring (13).

8. The pedicle positioning needle with a claw slot structure according to claim 6, wherein, A limiting ring (3) is fixed on the needle body (1), and the limiting ring (3) is located above the top holder and below the observation piece (10).

9. The pedicle positioning needle with a claw slot structure according to claim 8, wherein, A sealing ring (14) is provided on the lower side of the limiting ring (3).

10. The pedicle screw of claim 1, wherein: The lower end of the needle body (1) is the insertion part (2), and the insertion part (2) has a round head structure.

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