Sacroiliac screw structure

Abstract

The invention provides a sacroiliac screw structure which is characterized in that a first threaded section and a second threaded section are sequentially arranged on a main body part in the direction from the bottom of the main body part to the top of the main body part; a stop part is arranged in the center hole structure; the first avoiding hole is formed in the first threaded section and communicates with the center hole structure and the exterior of the main body part. The retaining structure comprises a first connecting rod, a first connecting block and a first protruding block, the first protruding block is movably inserted into the first receding hole, the retaining structure has a retaining position and a receding position, and when the retaining structure is located at the retaining position, the first connecting rod is connected with the first connecting block; the end, away from the first connecting block, of the first connecting rod is located in the center hole structure and matched with the stop part in a limiting mode, and the first connecting rod pushes the first connecting block so that the first protruding block can protrude out of the first receding hole. According to the technical scheme, the problem that in the prior art, the fixing effect of a sacroiliac screw structure is poor is effectively solved.

Description

Technical Field

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

[0002] Sacroiliac screws can be used in many conditions, such as spinal deformity correction, which requires sacroiliac screws to achieve long-segment fusion during surgery. They can also be used to treat pelvic instability injuries.

[0003] The current sacroiliac screws have the following problems: they do not take into account the distinction between the fixation area and the fusion area, which can easily cause loosening and unsatisfactory treatment effects; there are no conditions for fusion, resulting in insufficient long-term stability of the prosthesis. Summary of the invention

[0004] The main purpose of the present invention is to provide a sacroiliac screw structure to solve the problem of poor fixing effect of the sacroiliac screw structure in the related art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a sacroiliac screw structure, comprising: a main body, on which a first thread segment and a second thread segment are sequentially arranged from the bottom of the main body to the top of the main body, and the pitch of the first thread segment and the pitch of the second thread segment are different; a center hole structure, which penetrates the main body along the axial direction of the main body, and a stopper is arranged in the center hole structure; a first avoidance hole is arranged on the first thread segment, and the first avoidance hole communicates with the center hole structure and the outside of the main body; a stop structure, which is arranged in the center hole structure, and the stop structure includes A first connecting rod, a first connecting block and a first protruding block, the first connecting rod and the first protruding block are both connected to the first connecting block, the first protruding block can be movably inserted into the first avoidance hole, the stop structure has a stop position and an avoidance position, when the stop structure is in the stop position, the end of the first connecting rod away from the first connecting block is located in the center hole structure and cooperates with the stop part, the first connecting rod pushes the first connecting block to make the first protruding block protrude from the first avoidance hole, when the stop structure is in the avoidance position, the end of the first connecting rod away from the first connecting block is located on the outside of the main body.

[0006] Furthermore, the sacroiliac screw structure also includes a second avoidance hole, which is arranged on the side wall of the main body, the second avoidance hole connects the central hole structure and the outside of the main body, the second avoidance hole and the first avoidance hole are arranged at intervals, and the retreat prevention structure also includes a second connecting rod, a second connecting block and a second protruding block.

[0007] Further, a spherical cap is provided at the end of the first connecting rod away from the first connecting block; and / or a spike portion is provided at the end of the first protruding block.

[0008] Furthermore, the cross-sectional area of ​​the first connection block gradually decreases from the bottom of the main body to the top of the main body.

[0009] Further, a first avoidance recess is provided on a side of the first connection block facing the second connection block, and a second avoidance recess is provided on a side of the second connection block facing the first connection block.

[0010] Furthermore, the cross-sectional area of ​​the first thread segment gradually increases from the bottom of the main body to the top of the main body.

[0011] Furthermore, a plurality of first groove bodies are arranged at intervals on the first thread segment, each of the first groove bodies is spiral and is arranged crosswise with the plurality of thread portions on the first thread segment, and the plurality of first groove bodies are arranged at intervals along the circumference of the main body.

[0012] Furthermore, a plurality of second groove bodies are arranged at intervals on the second thread segment, each second groove body is spiral and cross-arranged with a plurality of thread portions on the second thread segment, and a plurality of second groove bodies are arranged at intervals along the circumference of the main body, and a width of the second groove body is greater than a width of the first groove body, and a depth of the second groove body is greater than a depth of the first groove body.

[0013] Further, the stopper is an inner convex ring, and the first connecting rod stopper is arranged on a side of the inner convex ring facing the bottom of the main body.

[0014] Furthermore, a third thread segment is provided on the main body, and the third thread segment is located on the side of the second thread segment away from the first thread segment. The pitch of the first thread segment is smaller than the pitch of the second thread segment, and the pitch of the third thread segment is larger than the pitch of the first thread segment and smaller than the pitch of the second thread segment.

[0015] According to the technical solution of the present invention, a first thread segment and a second thread segment are provided on the main body, the pitch of the first thread segment is different from the pitch of the second thread segment, the center hole structure is arranged through the main body along the axis direction of the main body, and a stopper is arranged in the center hole structure. The first avoidance hole is arranged on the first thread segment and communicates with the center hole structure and the outside of the main body. The stopper structure is arranged in the center hole structure, and the stopper structure includes a first connecting rod, a first connecting block and a first protruding block. The first protruding block is movably inserted into the first avoidance hole, and when the stopper structure is in the stopper position, the first connecting rod drives the first protruding block to extend out of the first avoidance hole. Through the above arrangement, after the sacroiliac screw structure is implanted, the first connecting rod is squeezed, so that one end of the first connecting rod away from the first connecting block is stopped and matched with the stopper, and when the first connecting rod is bent, it can squeeze the first connecting block and drive the first protruding block to move, that is, the first protruding block is extended out of the first avoidance hole, so that the first protruding block can be abutted and matched with the bone structure. In this way, the stability of the connection between the sacroiliac screw structure and the bone structure can be increased, and the sacroiliac screw structure can be prevented from coming out. Therefore, the technical solution of the present application effectively solves the problem of poor fixation effect of the sacroiliac screw structure in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a sacroiliac screw structure according to the present invention is shown;

[0018] Figure 2 Shows Figure 1 A schematic side view of the sacroiliac screw structure;

[0019] Figure 3 Shows Figure 1 A cross-sectional schematic diagram of a sacroiliac screw structure;

[0020] Figure 4 Shows Figure 3 A local enlarged view of point A;

[0021] Figure 5 Shows Figure 1 Schematic diagram of the exploded structure of the sacroiliac screw structure;

[0022] Figure 6 Shows Figure 5 A partial structural diagram of a stop structure;

[0023] Figure 7 Shows Figure 1 Schematic diagram of the sacroiliac screw structure from above.

[0024] The above drawings include the following reference numerals:

[0025] 10. Main body; 11. First thread segment; 111. First groove body; 12. Second thread segment; 121. Second groove body; 13. Third thread segment; 20. Center hole structure; 21. Stop portion; 211. Inner convex ring; 31. First avoidance hole; 32. Second avoidance hole; 40. Stop structure; 41. First connecting rod; 411. Spherical cap; 42. First connecting block; 421. First avoidance recess; 43. First protruding block; 431. Spike portion; 44. Second connecting rod; 45. Second connecting block; 451. Second avoidance recess; 46. Second protruding block. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0029] like Figures 1 to 3 as well as Figure 5 and Figure 6As shown, in this embodiment, the sacroiliac screw structure includes: a main body 10, a central hole structure 20, a first avoidance hole 31 and a stop structure 40. From the bottom of the main body 10 to the top of the main body 10, the main body 10 is sequentially provided with a first thread segment 11 and a second thread segment 12, and the pitch of the first thread segment 11 and the pitch of the second thread segment 12 are different. The central hole structure 20 penetrates the main body 10 along the axial direction of the main body 10, and a stopper 21 is provided in the central hole structure 20. The first avoidance hole 31 is provided on the first thread segment 11, and the first avoidance hole 31 connects the central hole structure 20 and the outside of the main body 10. The stop-retreat structure 40 is arranged in the center hole structure 20, and the stop-retreat structure 40 includes a first connecting rod 41, a first connecting block 42 and a first protruding block 43. The first connecting rod 41 and the first protruding block 43 are both connected to the first connecting block 42, and the first protruding block 43 can be movably inserted into the first avoidance hole 31. The stop-retreat structure 40 has a stop-retreat position and an avoidance position. When the stop-retreat structure 40 is in the stop-retreat position, the end of the first connecting rod 41 away from the first connecting block 42 is located in the center hole structure 20 and is limitedly matched with the stop portion 21. The first connecting rod 41 pushes the first connecting block 42 to make the first protruding block 43 protrude from the first avoidance hole 31. When the stop-retreat structure 40 is in the avoidance position, the end of the first connecting rod 41 away from the first connecting block 42 is located on the outside of the main body 10.

[0030] According to the technical solution of this embodiment, a first thread segment 11 and a second thread segment 12 are provided on the main body 10, and the pitch of the first thread segment 11 is different from the pitch of the second thread segment 12. The center hole structure 20 is provided through the main body 10 along the axial direction of the main body 10, and a stopper 21 is provided in the center hole structure 20. The first avoidance hole 31 is provided on the first thread segment 11 and connects the center hole structure 20 and the outside of the main body 10. The stop structure 40 is provided in the center hole structure 20, and the stop structure 40 includes a first connecting rod 41, a first connecting block 42 and a first protruding block 43. The first protruding block 43 is movably inserted into the first avoidance hole 31. When the stop structure 40 is in the stop position, the first connecting rod 41 drives the first protruding block 43 to extend out of the first avoidance hole 31. Through the above arrangement, after the sacroiliac screw structure is implanted, the first connecting rod 41 is squeezed, so that the end of the first connecting rod 41 away from the first connecting block 42 is stopped and matched with the stopper 21. When the first connecting rod 41 is bent, it can squeeze the first connecting block 42 and drive the first protruding block 43 to move, that is, the first protruding block 43 is extended out of the first avoidance hole 31, so that the first protruding block 43 can be abutted and matched with the bone structure. In this way, the stability of the connection between the sacroiliac screw structure and the bone structure can be increased, and the sacroiliac screw structure can be prevented from falling out. Therefore, the technical solution of this embodiment effectively solves the problem of poor fixing effect of the sacroiliac screw structure in the related art.

[0031] The above design makes the fixation of the sacroiliac screw structure in the bone more stable, especially when subjected to torque and tension, and can effectively prevent the screw from rotating and withdrawing. It is suitable for joint fixation surgery, improving the success rate of the surgery and the patient's rehabilitation effect.

[0032] like Figures 1 to 3 as well as Figures 5 to 7 As shown, in this embodiment, the sacroiliac screw structure further includes a second avoidance hole 32, which is arranged on the side wall of the main body 10, the second avoidance hole 32 communicates with the center hole structure 20 and the outside of the main body 10, the second avoidance hole 32 and the first avoidance hole 31 are arranged at intervals, and the stop structure 40 further includes a second connecting rod 44, a second connecting block 45 and a second protruding block 46. The second connecting rod 44, the second connecting block 45 and the second protruding block 46 are arranged in the center hole structure 20 relative to the first connecting rod 41, the first connecting block 42 and the first protruding block 43. When the stop structure 40 is in the stop position, the first protruding block 43 extends out of the first avoidance hole 31, and the second protruding block 46 extends out of the second avoidance hole 32. At this time, the first protruding block 43 and the second protruding block 46 can both abut and cooperate with the bone structure, which can further improve the anti-slip effect.

[0033] Specifically, by providing the second avoidance hole 32 and the corresponding stop structure 40, the fixing effect of the sacroiliac screw structure in different directions is enhanced, further improving the stability of the surgical site, and is suitable for complex surgical environments that require multi-directional fixing forces.

[0034] like Figures 1 to 3 as well as Figure 5 As shown, in this embodiment, a spherical cap 411 is provided at the end of the first connecting rod 41 away from the first connecting block 42; the provision of the spherical cap 411 can prevent the operator from getting stuck and being scratched.

[0035] like Figures 1 to 3 as well as Figures 5 to 7 As shown, in this embodiment, a spike portion 431 is provided at the end of the first protruding block 43. The arrangement of the spike portion 431 can be inserted into the bone structure, thereby making the position of the first protruding block 43 and the bone structure more stable.

[0036] It should be noted that the design of the spherical cap 411 allows the first connecting rod 41 to move more smoothly in the central hole structure 20, and the provision of the spike portion 431 increases the friction between the first protrusion 43 and the bone, making the fixing effect more significant and improving the safety and reliability of the fixation.

[0037] like Figures 1 to 3 as well as Figures 5 to 7As shown, in this embodiment, the cross-sectional area of ​​the first connection block 42 gradually decreases from the bottom of the main body 10 to the top of the main body 10. The above arrangement allows a certain distance between the side of the first connection block 42 away from the bottom of the main body 10 and the side wall of the central hole structure 20, which enables the first connection rod 41 to drive the first connection block 42 to swing, thereby allowing the side of the first connection block 42 away from the bottom of the main body 10 to contact the side wall of the central hole structure 20, so that the first protruding block 43 extends out of the first avoidance hole 31.

[0038] The above design makes the stop structure 40 more flexible when moving, and also reduces the damage to the bones, which can reduce the surgical wound and speed up the patient's recovery. This design is particularly suitable for minimally invasive surgery, such as percutaneous sacroiliac joint fixation surgery, which can minimize the damage to the surrounding tissues, reduce bleeding and inflammatory reactions, speed up the patient's postoperative recovery, and improve the patient's comfort and satisfaction.

[0039] It should be noted that when the first protruding block 43 extends out of the first avoidance hole 31, there is an acute angle hinge between the axis of the first protruding block 43 and the axis of the main body 10, and the distance between the end of the first protruding block 43 away from the first connecting block 42 and the top of the main body 10 is greater than the distance between the end of the first protruding block 43 close to the first connecting block 42 and the top of the main body 10. In this way, if the main body 10 has a tendency to withdraw from the bone structure, the first protruding block 43 can be inserted into the bone structure, and as the main body 10 moves out of the bone structure, the first protruding block 43 can be gradually inserted into the bone structure, and the insertion depth gradually increases.

[0040] like Figures 1 to 3 as well as Figures 5 to 7 As shown, in this embodiment, a first avoidance recess 421 is provided on one side of the first connection block 42 facing the second connection block 45, and a second avoidance recess 451 is provided on one side of the second connection block 45 facing the first connection block 42. The provision of the first avoidance recess 421 and the second avoidance recess 451 can achieve the avoidance effect, that is, the autologous bone structure or the allogeneic bone structure can be filled in the central hole structure 20, so that the autologous bone structure can grow into the central hole structure 20 and combine with the autologous bone structure or the allogeneic bone structure, thereby improving the stability of the sacroiliac screw structure.

[0041] The design of the first avoidance recess 421 and the second avoidance recess 451 prevents the first connection block 42 and the second connection block 45 from interfering with each other during movement, thereby ensuring the normal operation of the stop structure 40 and being suitable for surgeries requiring precise control of the screw position.

[0042] like Figures 1 to 3 as well as Figures 5 to 7As shown, in this embodiment, the cross-sectional area of ​​the first thread segment 11 gradually increases from the bottom of the main body 10 to the top of the main body 10. The above arrangement facilitates the sacroiliac screw structure to enter the bone structure.

[0043] The above-mentioned design makes the fixation of the sacroiliac screw structure in the bone more secure, and is suitable for surgical sites that are subjected to large external forces, such as fixation in hip replacement surgery. In hip replacement surgery, the screw needs to withstand the tremendous pressure caused by the patient's walking and daily activities. The design of the gradually increasing cross-sectional area of ​​the first threaded section 11 can significantly improve the compressive strength and fixation effect of the sacroiliac screw structure, reduce complications after hip replacement, such as prosthesis loosening and dislocation, and improve the long-term success rate of the operation.

[0044] like Figures 1 to 3 as well as Figures 5 to 7 As shown, in this embodiment, a plurality of first grooves 111 are arranged at intervals on the first thread segment 11, each first groove 111 is spiral and cross-arranged with a plurality of threaded portions on the first thread segment 11, and a plurality of first grooves 111 are arranged at intervals along the circumference of the main body 10. The first groove 111 cuts the first thread segment 11, thereby dividing the first thread segment 11 into multiple segments, and forming a cutting edge between two adjacent first thread segments 11, so that the sacroiliac screw structure can be rotated more easily into the bone structure.

[0045] It should be noted that the design of the spiral first groove body 111 increases the friction between the sacroiliac screw structure and the bone, improves the fixation strength, and is suitable for operations that require long-term fixation effects, such as fixation during the fracture healing period. During the fracture healing period, the bone needs long-term stability to promote healing. The spiral design of the first groove body 111 can significantly increase the contact area and friction between the screw and the bone, and can maintain the stability of the screw even during a long fixation process, effectively promote bone healing, reduce healing time, and improve the patient's quality of life.

[0046] like Figures 1 to 3 as well as Figures 5 to 7 As shown, in this embodiment, a plurality of second grooves 121 are arranged at intervals on the second thread segment 12, each second groove 121 is spiral and arranged crosswise with a plurality of threaded portions on the second thread segment 12, and a plurality of second grooves 121 are arranged at intervals along the circumference of the main body 10, and the width of the second groove 121 is greater than the width of the first groove 111, and the depth of the second groove 121 is greater than the depth of the first groove 111. The above arrangement enables the bone structure to grow into the second groove 121, and then can be closely connected with the second thread segment 12, and then can prevent the sacroiliac screw structure from withdrawing.

[0047] The above design makes the second thread segment 12 have a better fixation effect in the bone, and is suitable for surgical sites that require stronger fixation force. The increase in the width and depth of the second slot 121 can significantly improve the fixation effect of the sacroiliac screw structure, reduce the loosening of the sacroiliac screw structure caused by external forces, thereby ensuring the stability of the surgical site, accelerating the patient's recovery, and reducing postoperative complications.

[0048] Specifically, when the sacroiliac screw structure rotates into the bone structure, the powder of the bone structure scraped off by the sacroiliac screw structure can be squeezed into the second slot 121 and fill the second slot 121, so that the patient's own bone structure can be more easily integrated with the powder of the bone structure scraped off by the sacroiliac screw structure, thereby enabling better biological fixation.

[0049] like Figure 3 and Figure 4 As shown, in this embodiment, the stopper 21 is an inner convex ring 211, and the first connecting rod 41 is stopped at one side of the inner convex ring 211 facing the bottom of the main body 10. The inner convex ring 211 has a simple structure, is easy to set, and can effectively stop the first connecting rod 41 and the second connecting rod 44.

[0050] The design of the inner convex ring 211 makes the first connecting rod 41 more reliably stopped in the central hole structure 20, and is suitable for surgeries requiring long-term fixation.

[0051] like Figures 1 to 3 as well as Figure 5 As shown, in this embodiment, the main body 10 is further provided with a third thread segment 13, which is located on the side of the second thread segment 12 away from the first thread segment 11, the pitch of the first thread segment 11 is smaller than the pitch of the second thread segment 12, and the pitch of the third thread segment 13 is larger than the pitch of the first thread segment 11 and smaller than the pitch of the second thread segment 12. The above arrangement can achieve a better fixing effect of the sacroiliac screw structure.

[0052] Specifically, by setting the third thread segment 13, the second thread segment 12 and the first thread segment 11 with different pitches, the fixation effect of the sacroiliac screw structure in the bone is further optimized, and it is suitable for a variety of surgical environments, such as sacroiliac joint fixation, scoliosis correction, hip replacement, etc. in orthopedic surgery, and can meet the fixation requirements of different bone parts and different surgical needs. At the same time, the flexibility and adaptability of this sacroiliac screw structure enable it to play an important role in a variety of orthopedic surgeries. For example, in sacroiliac joint fixation surgery, the first thread segment provides an initial firm fixation, while the third thread segment can adapt to more complex bone structures and enhance the fixation effect.

[0053] Specifically, the third thread segment 13 mainly plays a fixing role, the area between the pitches of the third thread segment 13 is a grid structure, and the thread structure of the third thread segment 13 is designed as an anti-retreat inverted triangle, which can prevent the sacroiliac screw structure from retreating.

[0054] like Figures 1 to 3 as well as Figure 5 As shown, in the present embodiment, the second thread segment 12 mainly plays a fusion role, and its thread structure is symmetrically designed for easy screwing in. A second groove body 121 is designed on the second thread segment 12, and its direction is the same as the screwing direction of the thread, and its structure is designed so that during the screwing-in process, as the thread is screwed in, the second groove body 121 can squeeze the scraped cancellous bone into the second groove body 121 more easily. The interior of the second groove body 121 is a grid structure with a porosity of 60%-80%, which is more conducive to bone ingrowth; except for the second groove body 121 and the screw teeth of the second thread segment 12, the other parts are grid structures with a smaller porosity, which can reduce the weight of the sacroiliac screw structure while supplying blood to promote bone regeneration.

[0055] like Figures 1 to 3 as well as Figure 5 As shown, in this embodiment, the first thread segment 11 is the screw-in area, which is designed with a cutting edge to facilitate screwing in. The thread structure of the first thread segment 11 is also an anti-retreat inverted triangle structure to prevent the sacroiliac screw structure from being pushed out.

[0056] It should be noted that, in the cross-sectional view of the sacroiliac screw structure, the cross-section of the first thread segment 11 is a first triangle, and the cross-section of the third thread segment 13 is a second triangle. In the direction from the first thread segment 11 to the third thread segment 13, the width of the first triangle gradually increases, and the width of the second triangle gradually increases.

[0057] The sacroiliac screw structure of this embodiment can effectively improve the fixing effect of the screw in the bone by setting the first thread segment 11 and the second thread segment 12 with different pitches on the main body 10, and the stop structure 40 set in the center hole structure 20, and prevent the sacroiliac screw structure from rotating or withdrawing when subjected to external force, thereby increasing the safety and reliability of the operation. At the same time, the design of the first avoidance hole 31 and the second avoidance hole 32 enables the stop structure 40 to move to the avoidance position when necessary, which is convenient for the installation and disassembly of the sacroiliac screw structure and improves the convenience of operation. In addition, the spiral first groove body 111 and the second groove body 121 set on the first thread segment 11 and the second thread segment 12 can further increase the friction between the sacroiliac screw structure and the bone, and improve the fixing strength. The overall design is reasonable and the structure is stable.

[0058] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein are interpreted accordingly.

[0060] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sacroiliac screw structure, characterized in that: include: A main body (10), wherein a first thread segment (11) and a second thread segment (12) are sequentially arranged on the main body (10) in a direction from the bottom of the main body (10) to the top of the main body (10), and the pitch of the first thread segment (11) is different from the pitch of the second thread segment (12); A central hole structure (20) passes through the main body (10) along the axial direction of the main body (10), and a stopper (21) is provided in the central hole structure (20); A first avoidance hole (31) is provided on the first threaded section (11), the first avoidance hole (31) being in communication with the central hole structure (20) and the outside of the main body (10); A stop-retreat structure (40), the stop-retreat structure (40) being arranged in the central hole structure (20), the stop-retreat structure (40) comprising a first connecting rod (41), a first connecting block (42) and a first protruding block (43), the first connecting rod (41) and the first protruding block (43) both being connected to the first connecting block (42), the first protruding block (43) being movably inserted into the first avoidance hole (31), the stop-retreat structure (40) having a stop-retreat position and an avoidance position, when the stop-retreat structure (40) When in the stop position, one end of the first connecting rod (41) away from the first connecting block (42) is located in the central hole structure (20) and is limitedly matched with the stop portion (21); the first connecting rod (41) pushes the first connecting block (42) to make the first protruding block (43) protrude from the first avoidance hole (31); when the stop structure (40) is in the avoidance position, one end of the first connecting rod (41) away from the first connecting block (42) is located outside the main body (10).

2. The sacroiliac screw structure according to claim 1, characterized in that: The sacroiliac screw structure further comprises a second avoidance hole (32), the second avoidance hole (32) being arranged on the side wall of the main body (10), the second avoidance hole (32) being connected to the central hole structure (20) and the outside of the main body (10), the second avoidance hole (32) and the first avoidance hole (31) being arranged at intervals, and the stop structure (40) further comprises a second connecting rod (44), a second connecting block (45) and a second protruding block (46).

3. The sacroiliac screw structure according to claim 1, characterized in that: The end of the first connecting rod (41) away from the first connecting block (42) is provided with a spherical cap (411); and / or the end of the first protruding block (43) is provided with a spike portion (431).

4. The sacroiliac screw structure according to claim 1, characterized in that: In a direction from the bottom of the main body (10) to the top of the main body (10), the cross-sectional area of ​​the first connecting block (42) gradually decreases.

5. The sacroiliac screw structure according to claim 2, characterized in that: A first avoidance recess (421) is provided on a side of the first connection block (42) facing the second connection block (45), and a second avoidance recess (451) is provided on a side of the second connection block (45) facing the first connection block (42).

6. The sacroiliac screw structure according to claim 1, characterized in that: In a direction from the bottom of the main body (10) to the top of the main body (10), the cross-sectional area of ​​the first thread segment (11) gradually increases.

7. The sacroiliac screw structure according to claim 1, characterized in that: A plurality of first grooves (111) are arranged at intervals on the first thread segment (11); each of the first grooves (111) is spiral and arranged to cross with a plurality of threaded portions on the first thread segment (11); and the plurality of first grooves (111) are arranged at intervals along the circumference of the main body (10).

8. The sacroiliac screw structure according to claim 7, characterized in that: A plurality of second groove bodies (121) are arranged at intervals on the second thread segment (12); each second groove body (121) is spirally shaped and is arranged crosswise with the plurality of threaded portions on the second thread segment (12); the plurality of second groove bodies (121) are arranged at intervals along the circumference of the main body (10); the width of the second groove body (121) is greater than the width of the first groove body (111); and the depth of the second groove body (121) is greater than the depth of the first groove body (111).

9. The sacroiliac screw structure according to any one of claims 1 to 7, characterized in that: The stop portion (21) is an inner convex ring (211), and the first connecting rod (41) stopper is arranged on a side of the inner convex ring (211) facing the bottom of the main body (10).

10. The sacroiliac screw structure according to any one of claims 1 to 7, characterized in that: The main body (10) is also provided with a third thread segment (13), the third thread segment (13) being located on a side of the second thread segment (12) away from the first thread segment (11), the pitch of the first thread segment (11) being smaller than the pitch of the second thread segment (12), and the pitch of the third thread segment (13) being larger than the pitch of the first thread segment (11) and smaller than the pitch of the second thread segment (12).

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