Iliolumbar fixing device for sacroiliac joint fracture dislocation

Abstract

The invention relates to the technical field of medical auxiliary instruments, in particular to an iliolumbar fixing device for sacroiliac joint fracture dislocation, which comprises a pelvic external fixing frame with an arc-shaped structure and a sacroiliac screw, an arc-shaped sliding groove is formed in the pelvic external fixing frame, and a locking seat is slidably connected in the arc-shaped sliding groove; a locking assembly used for limiting the locking seat to slide in the arc-shaped sliding groove is arranged on the locking seat, and an extension nail is integrally formed at the tail part of the sacroiliac screw; a universal fixing assembly and a universal limiting assembly are sequentially arranged on the extension screw in the axial direction of the extension screw, and the universal fixing assembly is used for fixing the implantation depth of the sacroiliac screw; a universal joint is further arranged on the locking seat, and the universal limiting assembly is used for achieving self-adaptive adjustment and rigid locking of the sacroiliac screw puncture angle; the depth and angle of the sacroiliac screw are limited and fixed through the universal fixing assembly and the universal limiting assembly, and the problem that the mechanical property of an existing device is weakened due to the fact that the degree of freedom is improved is solved.

Description

Technical Field

[0001] This invention relates to the field of medical assistive device technology, specifically to an iliopsoas fixation device for sacroiliac joint fracture-dislocation. Background Technology

[0002] Iliolumbar fixation is a precise orthopedic fixation technique for sacroiliac joint dislocation injuries. By constructing a stable anchoring connection structure between the iliac bone and the lumbar vertebrae, it achieves anatomical reduction and strong fixation of the sacroiliac joint, providing continuous and stable mechanical support to the injured area, and ultimately achieving the clinical goals of promoting fracture healing and reconstructing the biomechanical stability of the pelvic ring.

[0003] In the prior art, for example, Chinese patent document with publication number CN119949988A, a locking device for unstable fractures of the sacroiliac joint and sacrum is proposed. It optimizes the connection mechanism between the screw and the lumbar locking plate (fixed by a split bolt connection) to meet the multi-dimensional angle insertion requirements of the screw connecting the sacroiliac joint, increases the degree of freedom of the screw used for sacroiliac joint fixation, and improves the adaptability and ease of operation for different fracture sites in clinical practice.

[0004] As the mechanical transfer hub between the spine and pelvis, the sacroiliac joint needs to transmit the entire axial load of the upper body and withstand the complex shear forces and torsional stresses generated by walking, turning and other movements. Therefore, the internal fixation system used to maintain its stability must have excellent pull-out resistance and fatigue strength. However, the existing iliopsoas fixation device with multi-degree-of-freedom adjustment function, although it achieves flexible adaptation of the implantation angle through bolt connection, inevitably weakens the bone holding force of the screw and the overall torsional and pull-out mechanical properties of the system. Therefore, it is urgent to develop an iliopsoas fixation device for sacroiliac joint fracture-dislocation that can meet the stability requirements under extreme mechanical loads while retaining the flexibility of implantation. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides an iliopsoas fixation device for sacroiliac joint fracture-dislocation. By using a universal fixation component and a universal limiting component to separately limit and fix the depth and angle of the sacroiliac screw, the mechanical performance of existing devices is reduced due to the increased degrees of freedom.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: an iliopsoas fixation device for sacroiliac joint fracture and dislocation, comprising an arc-shaped external pelvic fixation frame and a sacroiliac screw, wherein an arc-shaped groove is provided on the external pelvic fixation frame, a locking seat is slidably connected in the arc-shaped groove, and a locking component is provided on the locking seat for limiting the sliding of the locking seat in the arc-shaped groove, and an extension screw is integrally formed at the tail of the sacroiliac screw.

[0007] The extension screw is provided with a universal fixing component and a universal limiting component along its axial direction. Both the universal fixing component and the universal limiting component are hinged to the extension screw. The universal fixing component is used to make a vertical locking connection with the locking seat to fix the implantation depth of the sacroiliac screw.

[0008] The locking seat is also equipped with a universal joint, and the universal limiting component is fixedly connected to the universal joint. The universal limiting component is used to coordinate with the universal fixing component to hinge and lock the locking seat, so as to realize adaptive adjustment and rigid locking of the sacroiliac screw puncture angle.

[0009] The technical principle of the above solution is as follows: This solution uses an integrally formed extension screw at the tail of the sacroiliac screw, and sets a universal fixation component and a universal limiting component in sequence along the axial direction of the extension screw. The vertical locking connection between the universal fixation component and the locking seat achieves precise fixation of the sacroiliac screw implantation depth. At the same time, through the coordinated cooperation between the universal limiting component and the universal joint on the locking seat, combined with the sliding adjustment of the locking seat in the arc-shaped groove, the puncture angle of the sacroiliac screw is adaptively adjusted. Finally, the locking component completes rigid locking, thus constructing a stable iliopsoas fixation system that combines depth fixation and angle adaptation.

[0010] The above approach has the following beneficial effects:

[0011] 1. This solution uses a dual hinged locking structure of universal fixing components and universal limiting components to improve the torsional and pull-out resistance of the fixing system while retaining the ability to adapt to multiple angles. It can effectively bear the extreme load requirements of the sacroiliac joint as the mechanical hub of the spine and pelvis, and reduce the problem of weakened mechanical performance caused by the increased degrees of freedom of existing devices.

[0012] 2. This method allows for the initial puncture and installation of sacroiliac screws, followed by fitting and locking through the coordinated adjustment of multiple components. This eliminates the need for repeated adjustments to the screw implantation angle, shortens surgical time, reduces the risk of secondary damage to surrounding soft tissues, and improves the convenience and safety of clinical procedures.

[0013] Furthermore, the universal fixing assembly includes a first ball head threadedly connected to an extension pin, a first collar sleeved on the outer side of the first ball head, the first collar slidingly engaging with the first ball head, a vertical connecting rod fixedly connected to the bottom of the first collar, and the end of the vertical connecting rod away from the first collar threadedly connected to a locking seat.

[0014] Beneficial effects: The sliding fit structure between the first ball head and the first ring retains the ability to adjust the circumferential angle of the sacroiliac screw, while strengthening the axial force transmission path of the fixation system through the rigid connection of the vertical connecting rod, and at the same time simplifying the connection operation process with the locking seat during the operation.

[0015] Furthermore, the sliding fit between the first ball head and the first ring is specifically as follows:

[0016] The first ring has a first ball groove corresponding to the shape of the first ball head, and a ring slider is formed on the surface of the first ball head along the circumference of the sacroiliac screw. A ring groove is formed in the first ball groove corresponding to the ring slider, so that the first ring can only rotate and slide along the circumference of the sacroiliac screw.

[0017] Beneficial effects: The limiting sliding cooperation between the ring slider and the ring groove limits the adjustment freedom of the universal fixation component, which not only meets the circumferential adaptation requirements of the sacroiliac screw at different implantation angles, but also reduces the implantation depth deviation that may be caused by the axial swing of the sacroiliac screw during use.

[0018] Furthermore, the locking assembly includes symmetrical nuts, both of which are threaded to the vertical connecting rod and are located at the top and bottom of the locking seat, respectively.

[0019] Beneficial effects: The double-nut locking structure provides uniform axial clamping force, effectively preventing the locking seat from sliding in the arc-shaped groove, while also facilitating quick adjustment of the height of the locking seat during surgery.

[0020] Furthermore, the universal joint includes an extension plate fixedly connected to the locking seat, a second ball head fixedly connected to the extension plate, and a rod connecting groove sleeved on the second ball head, with the second ball head slidingly engaging with the rod connecting groove.

[0021] Beneficial effects: The extension plate and the second ball head, and the rod connection groove on the outside of the second ball head, enable multi-dimensional swing adjustment of the universal joint; provide flexible angle adaptation capability to match different puncture angles of the sacroiliac screws, and ensure optimal mechanical alignment between the fixation system and the external pelvic fixator.

[0022] Furthermore, the universal limiting assembly includes a third ball head threaded onto an extension pin, a second collar sleeved on the outer side of the third ball head, the second collar slidingly engaging with the third ball head, and a swing connecting rod fixedly connected to the bottom of the second collar, the end of the swing connecting rod away from the second collar being able to fit against the bottom of the rod connecting groove.

[0023] Beneficial effects: The sliding fit structure between the third ball head and the second collar hinges the swing connecting rod and the extension pin, and makes the swing connecting rod fit into the rod connection groove of the universal joint; it expands the angle adjustment range of the sacroiliac screw, and at the same time, the fit between the swing connecting rod and the rod connection groove strengthens the lateral force transmission path of the fixation system and improves the overall anti-torsional performance.

[0024] Furthermore, the sliding fit between the second ring and the second ball head is specifically as follows:

[0025] The second ring has a second ball groove corresponding to the second ball head. The second ball head and the second ball groove slide together, so that the second ring can swing and adjust with the second ball head as the center.

[0026] Beneficial effects: The second ring has a second ball groove corresponding to the second ball head, which allows the second ring to swing and adjust with the second ball head as the center; it gives the second ring full freedom of swing, which can realize adaptive adjustment of the sacroiliac screw puncture angle, ensure the precise alignment of the fixation device and the external pelvic fixation frame, and the spherical contact method can form a uniform stress distribution mechanism.

[0027] Furthermore, an arc-shaped fitting groove is provided on the second ball head, and the curvature of the fitting groove is equal to the curvature of the swing connecting rod.

[0028] Beneficial effects: The opening of the arc-shaped fitting groove allows the swing connecting rod to fit precisely with the fitting groove; it increases the contact area between the swing connecting rod and the second ball head, improves the stress dispersion effect at the connection point, and reduces the risk of local stress concentration.

[0029] Furthermore, a fixing nut is threaded onto the rod connecting groove, and the bottom of the fixing nut can fit against the outer wall of the swing connecting rod.

[0030] Beneficial effects: The design of the fixing nut allows the bottom of the fixing nut to fit tightly against the outer wall of the swing connecting rod when tightened, thus locking and fixing the swing connecting rod; it can provide sufficient axial compressive force to ensure a firm connection between the swing connecting rod and the universal joint.

[0031] Furthermore, the diameter of the vertical connecting rod is larger than the diameter of the swing connecting rod.

[0032] Beneficial effects: The cross-sectional dimensions are designed differently based on the functional positioning of the vertical connecting rod and the swing connecting rod; as the core force transmission component connecting the external pelvic fixation frame and the sacroiliac screw, the larger diameter of the vertical connecting rod can provide higher bending and torsional modulus, enhancing the mechanical stability of the fixation system; as the angle adjustment component, the smaller diameter of the swing connecting rod can reduce the overall weight of the device and the burden of intraoperative operation, while avoiding restricting the swing freedom of the universal joint, achieving the optimal balance between mechanical performance and ease of operation.

[0033] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the iliopsoas fixation device for sacroiliac joint fracture-dislocation of the present invention;

[0035] Figure 2 This is a schematic diagram showing the disassembled universal fixation component in an embodiment of the iliopsoas fixation device for sacroiliac joint fracture-dislocation of the present invention.

[0036] Figure 3This is a schematic diagram showing the disassembled universal limiting component in an embodiment of the iliopsoas fixation device for sacroiliac joint fracture-dislocation of the present invention.

[0037] Figure 4 This is a schematic diagram showing the disassembled universal joint in an embodiment of the iliopsoas fixation device for sacroiliac joint fracture-dislocation of the present invention.

[0038] Figure 5 This is a schematic diagram of the connection between the swing connecting rod and the rod connecting groove in an embodiment of the iliopsoas fixation device for sacroiliac joint fracture-dislocation of the present invention.

[0039] The reference numerals in the accompanying drawings of the instruction manual include: 1. External pelvic fixation frame; 101. Arc-shaped groove; 2. Sacroiliac screw; 3. Extension screw; 4. Universal fixation assembly; 401. First ball head; 402. First collar; 403. First ball groove; 404. Ring slider; 405. Ring groove; 406. Vertical connecting rod; 5. Universal limiting assembly; 501. Third ball head; 502. Second collar; 503. Swing connecting rod; 6. Locking seat; 7. Nut; 8. Universal joint; 801. Extension plate; 802. Second ball head; 8021. Fitting groove; 803. Rod connecting groove; 9. Fixing nut. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The following detailed description illustrates the specific implementation method:

[0044] Example 1:

[0045] Conventional sacroiliac joint fixation techniques typically employ a combination of a screw system and an external pelvic fixator, as detailed below. Figure 1 As shown, this embodiment provides an iliopsoas fixation device for sacroiliac joint fracture-dislocation, including an arc-shaped external pelvic fixator 1 and sacroiliac screws 2.

[0046] The special feature of this embodiment is that, addressing the practical technical problem of varying sacroiliac joint morphologies in different patients, the sacroiliac screw 2 proposed in this embodiment has an integrally formed extension screw 3 at its tail. The extension screw 3 has a universal fixation component 4 and a universal limiting component 5 sequentially arranged along its axial direction. This solution aims to optimize the existing technology by fixing the implantation depth of the sacroiliac screw 2 (i.e., optimizing its pull-out resistance) and adapting and locking the implantation angle of the sacroiliac screw 2 (i.e., increasing the degree of freedom in the installation angle of the sacroiliac screw 2). Specifically:

[0047] Regarding the fixed optimization of implantation depth, combined with Figure 1 and Figure 2 As shown, the universal fixation assembly 4 proposed in this embodiment includes a first ball head 401 threadedly connected to the extension screw 3. A first collar 402 is sleeved on the outer side of the first ball head 401. A first ball groove 403 corresponding to the shape of the first ball head 401 is formed on the first collar 402. A ring slider 404 along the circumference of the sacroiliac screw 2 is formed on the surface of the first ball head 401. A ring groove 405 corresponding to the ring slider 404 is formed in the first ball groove 403, so that the first collar 402 can only rotate and slide along the circumference of the sacroiliac screw 2. A vertical connecting rod 406 is integrally formed at the bottom of the first collar 402. The spherical fit between the first ball head 401 and the first ball groove 403 gives the first collar 402 the ability to adjust along the circumference of the sacroiliac screw 2, adapting to the fixation requirements of the sacroiliac screw 2 at different implantation angles.

[0048] For the vertical connecting rod 406, in this embodiment, an arc-shaped groove 101 is provided on the pelvic external fixator 1. A locking seat 6 is slidably connected in the arc-shaped groove 101. The locking seat 6 is provided with a locking component for limiting the sliding of the locking seat 6 in the arc-shaped groove 101. The locking component includes two nuts 7 symmetrically located at the top and bottom of the locking seat 6. Both symmetrical nuts 7 are threadedly connected to the vertical connecting rod 406. During installation, the vertical connecting rod 406 is passed through the adapter hole on the locking seat 6. Then, the two nuts 7 are screwed into the corresponding threaded sections of the vertical connecting rod 406 from the top and bottom of the locking seat 6, respectively. By simultaneously tightening the top and bottom nuts 7, the locking seat 6 is clamped and fixed at a specified height position on the vertical connecting rod 406, while locking the sliding freedom of the locking seat 6 in the arc-shaped groove 101. Combined with the limitation of the axial swing of the first ring 402, the depth deviation during the constraint and fixation process of the sacroiliac screw 2 is reduced (i.e., the pull-out resistance of the sacroiliac screw 2 is improved), achieving precise and convenient locking of the implantation depth.

[0049] Regarding the fitting and locking of the implantation angle of the sacroiliac screw 2, combined with Figure 1 and Figure 3 As shown, the universal limiting component 5 proposed in this embodiment includes a third ball head 501 threadedly connected to the extension pin 3. A second collar 502 is sleeved on the outer side of the third ball head 501. A second ball groove corresponding to the second ball head 802 is formed on the second collar 502. The second ball head 802 and the second ball groove slide in fit, so that the second collar 502 can swing and adjust with the second ball head 802 as the center. A swing connecting rod 503 is fixedly connected to the bottom of the second collar 502. The spherical sliding fit between the third ball head 501 and the second ball groove is suitable for the sacroiliac screw 2. The diverse implantation angles resulting from differences in anatomical dislocation or fracture-dislocation classification allow for locking and fixation based on the posture of the sacroiliac screw 2 after puncture and installation, rather than the pre-limited positioning based on the posture of the sacroiliac screw 2 in existing technologies before puncture and installation. In addition, the spherical contact method can form a comprehensive stress dispersion mechanism after locking, which can improve the torsional and pull-out resistance of the sacroiliac screw 2 fixation system. During the operation, precise alignment can be achieved by swing adjustment without repeated adjustment of the screw implantation path, shortening the operation time and reducing the risk of secondary damage to surrounding soft tissues.

[0050] For the connection of the swing connecting rod 503, such as Figure 4As shown, in this embodiment, a universal joint 8 is also provided on the locking seat 6. The universal joint 8 includes an extension plate 801 fixedly connected to the locking seat 6. A second ball head 802 is integrally formed on the extension plate 801. A rod connecting groove 803 is sleeved on the second ball head 802. The second ball head 802 and the rod connecting groove 803 are slidably engaged. An arc-shaped fitting groove 8021 is formed on the second ball head 802. The arc of the fitting groove 8021 is equal to the arc of the swing connecting rod 503. A fixed rod is threadedly connected to the rod connecting groove 803. The fixing nut 9 is used so that its bottom can fit against the outer wall of the swing connecting rod 503. Installation of the swing connecting rod 503: First, adjust the rod connecting groove 803, then place the swing connecting rod 503 into the rod connecting groove 803, so that the rod connecting groove 803 encloses the swing connecting rod 503. Then, by placing and tightening the fixing nut 9, the axial compressive force generated by the tight fit between the bottom of the fixing nut 9 and the outer wall of the swing connecting rod 503 securely locks the swing connecting rod 503 into the mating groove 8021 (e.g., ...). Figure 5 As shown), and locks the rotation of the second ball head 802, so as to achieve both angular adaptability and reliable connection between the swing connecting rod 503 and the universal joint 8 of the locking seat 6.

[0051] Based on the aforementioned integrated universal connection system, the circumferential sliding constraint of the ring slider 404 and the ring groove 405, combined with the clamping and locking of the two nuts 7 on the upper and lower parts of the vertical connecting rod 406, limits the implantation depth of the sacroiliac screw 2 in the axial dimension, reducing the depth deviation during the fixation process of the pelvic external fixator 1 and the sacroiliac screw 2, and enhancing the pull-out resistance of the overall fixation device; while the spherical mating structure of the first ball head 401 and the first ball groove 403, the third ball head 501 and the second ball groove, and the second ball head 802 and the rod connecting groove 803, achieves multi-angle adaptation while using the spherical surface to achieve full-range... The contact points form a uniform stress dispersion mechanism, which, together with the rigid force transmission of the integrally molded vertical connecting rod 406 and the swing connecting rod 503, enhances the torsional bearing strength of the entire fixation system. At the same time, the threaded connection of the multi-components eliminates the need for a preset screw implantation path during the operation. The puncture and installation of the sacroiliac screw 2 can be completed first, and multi-dimensional precise alignment can be achieved quickly. Then, a firm lock can be achieved by tightening the nut 7 and the fixing nut 9. There is no need to repeatedly adjust the screw implantation angle, which shortens the operation time and reduces the risk of secondary damage to the soft tissues around the sacroiliac joint.

[0052] Example 2:

[0053] As attached Figure 1As shown, the difference from Embodiment 1 is that the diameter of the vertical connecting rod 406 is larger than the diameter of the swing connecting rod 503. The vertical connecting rod 406 is the core force transmission component connecting the pelvic external fixator 1 and the sacroiliac screw 2 axial fixation system. The larger diameter can provide higher cross-sectional bending and torsional modulus, effectively bearing the axial pull-out force and torsional stress of the sacroiliac screw 2, ensuring the mechanical stability of the fixation system. The swing connecting rod 503 mainly undertakes the angle adaptation force transmission requirements of the universal limiting component 5. The smaller diameter can reduce the overall weight of the device and the burden of intraoperative operation while meeting the basic mechanical strength. At the same time, it avoids restricting the swing freedom of the universal joint 8 due to the excessive diameter. It ensures the high strength bearing capacity of the core force transmission path and takes into account the flexibility and ease of operation of the angle adjustment component.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An iliopsoas fixation device for sacroiliac joint fracture-dislocation, comprising an arc-shaped external pelvic fixator (1) and sacroiliac screws (2), characterized in that, The external fixator (1) of the pelvis is provided with an arc-shaped groove (101), and a locking seat (6) is slidably connected in the arc-shaped groove (101). The locking seat (6) is provided with a locking component for limiting the sliding of the locking seat (6) in the arc-shaped groove (101). The tail of the sacroiliac screw (2) is integrally formed with an extension nail (3). The extension nail (3) is provided with a universal fixing component (4) and a universal limiting component (5) in sequence along its axial direction. Both the universal fixing component (4) and the universal limiting component (5) are hinged to the extension nail (3). The universal fixing component (4) is used to make a vertical locking connection with the locking seat (6) and to fix the implantation depth of the sacroiliac screw (2). The locking seat (6) is also provided with a universal joint (8). The universal limiting component (5) is fixedly connected to the universal joint (8). The universal limiting component (5) is used to coordinate with the universal fixing component (4) to hinge and lock the locking seat (6) to achieve adaptive adjustment and rigid locking of the puncture angle of the sacroiliac screw (2).

2. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 1, characterized in that, The universal fixing assembly (4) includes a first ball head (401) threaded onto an extension pin (3), a first collar (402) sleeved on the outside of the first ball head (401), the first collar (402) slidingly engaging with the first ball head (401), a vertical connecting rod (406) fixedly connected to the bottom of the first collar (402), and the end of the vertical connecting rod (406) away from the first collar (402) threadedly connected to a locking seat (6).

3. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 2, characterized in that, The sliding fit between the first ball head (401) and the first collar (402) is as follows: The first ring (402) has a first ball groove (403) corresponding to the shape of the first ball head (401). The surface of the first ball head (401) has a ring slider (404) along the circumference of the sacroiliac screw (2). The first ball groove (403) has a ring sliding groove (405) corresponding to the ring slider (404), so that the first ring (402) can only rotate and slide along the circumference of the sacroiliac screw (2).

4. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 3, characterized in that, The locking assembly includes symmetrical nuts (7), both of which are threaded to the vertical connecting rod (406) and are located at the top and bottom of the locking seat (6), respectively.

5. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 4, characterized in that, The universal joint (8) includes an extension plate (801) fixedly connected to the locking seat (6), a second ball head (802) fixedly connected to the extension plate (801), a rod connecting groove (803) sleeved on the second ball head (802), and the second ball head (802) slidingly engaging with the rod connecting groove (803).

6. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 5, characterized in that, The universal limiting assembly (5) includes a third ball head (501) threaded onto an extension pin (3), a second collar (502) sleeved on the outside of the third ball head (501), the second collar (502) slidingly engaging with the third ball head (501), and a swing connecting rod (503) fixedly connected to the bottom of the second collar (502), the end of the swing connecting rod (503) away from the second collar (502) being able to fit against the bottom of the rod connecting groove (803).

7. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 6, characterized in that, The sliding fit between the second ring (502) and the second ball head (802) is as follows: The second ring (502) has a second ball groove corresponding to the second ball head (802). The second ball head (802) slides with the second ball groove, so that the second ring (502) can swing and adjust with the second ball head (802) as the center.

8. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 7, characterized in that, The second ball head (802) has an arc-shaped fitting groove (8021), the curvature of which is equal to that of the swing connecting rod (503).

9. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 8, characterized in that, A fixing nut (9) is threaded onto the rod connecting groove (803), and the bottom of the fixing nut (9) can fit against the outer wall of the swing connecting rod (503).

10. The iliopsoas fixation device for sacroiliac joint fracture-dislocation according to claim 9, characterized in that, The diameter of the vertical connecting rod (406) is larger than the diameter of the swing connecting rod (503).

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