A rotatable hemipelvic prosthesis

Abstract

The application relates to the field of medical devices, in particular to a rotatable hemipelvic prosthesis. The hemipelvic prosthesis comprises a sacrum prosthesis for being attached to a sacrum bone cutting surface and an iliac wing prosthesis for being attached to an iliac bone cutting surface, and an angle adjusting and locking assembly is arranged between the two, the assembly comprises a locking piece, a pivot part and a pivot seat part, and has two states of angle adjusting and locking. The sacrum prosthesis and the iliac wing prosthesis respectively comprise a solid structure and a trabecular structure, and are provided with various mounting holes for fixing bones, and the iliac wing prosthesis is further provided with a muscle suture hole and an external slot hole. The application can flexibly adjust the angle of the hemipelvic prosthesis and lock the angle, can be conveniently fixed with bones, can meet the operation requirements, and can realize better muscle connection and cooperation with an orthopedic nail and rod system through the muscle suture hole and the external slot hole.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a rotatable hemipelvic prosthesis. Background Technology

[0002] In the medical field, the treatment of pelvic-related diseases and injuries has always been an important research direction. With the continuous development of medical technology, the application of pelvic prostheses has provided an effective means of addressing pelvic injuries and diseases. The advent of pelvic prostheses has greatly improved patients' quality of life, helping them regain some bodily functions and return to normal life. It has played a significant role in improving patients' mobility and alleviating pain, thus driving progress in the field of orthopedic treatment.

[0003] In traditional pelvic prosthesis techniques, two main methods have been conventionally used to repair and replace the pelvis. One method involves using a one-piece semi-pelvic prosthesis. This prosthesis is designed as a single unit and is directly installed in the patient's pelvic region through a specific surgical procedure to replace damaged pelvic tissue. The other method uses more traditional fixation techniques, employing numerous screws and complex connection structures to ensure the connection and fixation of the prosthesis to the human skeleton. These conventional methods, to a certain extent, meet the basic needs of pelvic repair and provide feasible treatment options for patients.

[0004] However, existing technologies have significant drawbacks. On the one hand, most current hemipelvic prostheses are one-piece structures, requiring extremely high precision in osteotomy during surgery, making intraoperative morphological adjustments impossible. Forcing a fit often necessitates additional osteotomy, leading to bone loss in the host tissue, and forced repositioning increases traction damage to surrounding soft tissues. On the other hand, these one-piece prostheses cannot adapt to differences in pelvic tilt angles and anatomical morphology among patients. Forced placement during surgery can easily cause pre-stress within the prosthesis, increasing the risk of postoperative loosening or breakage, making precise anatomical matching between the prosthesis and the host skeleton difficult. Furthermore, the large size and fixed shape of current hemipelvic prostheses make muscle and soft tissue suturing difficult after installation, hindering the restoration of the original physiological tension of the soft tissues. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides a rotatable hemipelvic prosthesis that can flexibly adjust and lock the angle of the hemipelvic prosthesis, facilitates adaptation and fixation to the skeleton, effectively transmits physiological loads, meets surgical needs, and can also achieve better muscle connection and technical effects in conjunction with orthopedic rod and screw systems through muscle suture holes and external slot holes.

[0006] This application is achieved through the following technical solution: A rotatable hemipelvic prosthesis includes a sacral prosthesis for fitting against the sacral osteotomy surface and an iliac wing prosthesis for fitting against the iliac osteotomy surface; an angle-adjusting locking assembly is provided between the sacral prosthesis and the iliac wing prosthesis; the angle-adjusting locking assembly includes a locking member, and a pivot portion and a pivot seat portion respectively disposed at the connection between the sacral prosthesis and the iliac wing prosthesis; the pivot portion is fitted into the pivot seat portion, and the two have a coaxial pivot axis; the angle-adjusting locking assembly has an angle-adjusting state and a locked state: in the angle-adjusting state, the locking member is in a released state to allow the sacral prosthesis and the iliac wing prosthesis to rotate relative to each other about the pivot axis; in the locked state, the locking member is tightened to lock and fix the sacral prosthesis and the iliac wing prosthesis relative to each other, thereby limiting their relative positions.

[0007] By adopting the above technical solution, an angle-adjusting locking assembly consisting of a locking element, a pivot part, and a pivot seat part is set between the sacral prosthesis and the iliac wing prosthesis. This allows the two prostheses to rotate relative to each other around a coaxial pivot axis and achieve locking. This solves the technical problems of existing hemipelvic prostheses, such as fixed shape, difficulty in adapting to the differences in pelvic shape among different patients, and difficulty in accurately reconstructing the pelvic anatomical angle during surgery. When in the angle adjustment state, the locking element is released, and the surgeon can adjust the relative rotation of the sacral prosthesis and the iliac wing prosthesis during surgery according to the patient's actual bone defect, pelvic tilt angle, and contralateral pelvic parameters. When in the locked state, the locking element is tightened, firmly fixing the two prostheses and limiting their relative position, ensuring the stability of the prosthesis posture after surgery. This allows prostheses of the same size to be adapted to a wider range of patients, shortens the preoperative customization period, and significantly improves the reconstruction effect of pelvic symmetry and weight-bearing line after surgery.

[0008] Furthermore, the pivot portion includes a protruding post disposed on the connecting end of the sacral prosthesis, and the pivot seat portion includes a recessed hole disposed in the connecting end of the iliac wing prosthesis; the iliac wing prosthesis has a sliding hole communicating with the interior of the recessed hole, and the protruding post has a fastening bottom hole at a position corresponding to the sliding hole; a portion of the locking member passes through the sliding hole and is fastened to the fastening bottom hole.

[0009] By adopting the above technical solution, the pivot part is specifically set as a protruding post on the connecting end of the sacral prosthesis, and the seat part is specifically set as a concave hole in the connecting end of the iliac wing prosthesis. The protruding post is inserted into the concave hole to form a stable axial fitting structure. A sliding fitting hole is opened on the surface of the iliac wing prosthesis, and a fastening bottom hole is opened at the corresponding position on the protruding post. A part of the locking element passes through the sliding fitting hole and is screwed into the fastening bottom hole. The insertion and fitting of the protruding post and the concave hole are used to bear the shear force and torsional load, and the locking element provides the axial locking force, forming a structural form that separates the load bearing and locking. This makes the angle adjustment locking assembly have high structural strength and fatigue resistance when transmitting loads. At the same time, the disassembly and assembly of the locking element facilitates repeated adjustment and final fixation during the operation.

[0010] Furthermore, the sliding hole is an elongated hole extending axially along the concave hole, and the sliding hole has a stepped surface; the fastening bottom hole is an internally threaded hole; and the locking element is a screw.

[0011] By adopting the above technical solution, the sliding hole is set as an elongated oval hole extending along the axial direction of the concave hole. This allows the screw, acting as a locking element, to slide synchronously along the elongated oval hole as the relative rotation between the protrusion and the concave hole occurs during angle adjustment. This enables continuous angle adjustment without removing the screw, avoiding the complexity of intraoperative operations and device wear caused by repeated disassembly and assembly. In the locked state, the screw is tightened into the internal threaded hole, and its head is firmly pressed against the stepped surface within the sliding hole. The stepped surface not only provides a flat and wide force-bearing surface for the screw head, forming a stable surface contact clamping structure, but also significantly improves the frictional self-locking effect after locking, preventing angular drift of the prosthesis under pelvic physiological loads. Simultaneously, the stepped surface allows the screw head to sink into the hole, preventing it from protruding from the prosthesis surface and causing frictional irritation to surrounding soft tissues. Furthermore, the extension length of the elongated oval hole directly limits the maximum adjustable angle range, avoiding structural interference caused by excessive rotation.

[0012] Furthermore, the sacral prosthesis includes a first solid structure and a first trabecular bone structure disposed on the bone contact surface side of the first solid structure; the protruding post is disposed on the first solid structure; the first trabecular bone structure is bent and includes a transverse portion for conforming to the fifth lumbar vertebra and a vertical portion for conforming to the sacrum; the side surface of the first solid structure for supporting the first trabecular bone structure has a corresponding bent profile.

[0013] By adopting the above technical solution, the sacral prosthesis is designed as a composite structure combining a first solid structure and a first trabecular structure. The first solid structure bears the main mechanical support and provides a stable base for the protruding column, while the first trabecular structure conforms to the bone contact surface to induce bone ingrowth and achieve long-term biological fixation. The first trabecular structure is designed to be bent and includes a transverse part conforming to the fifth lumbar vertebra and a vertical part conforming to the sacrum. This allows the prosthesis to conform to the lower surface of the fifth lumbar vertebra and the outer surface of the sacrum at the lumbosacral junction. The support surface of the first solid structure on the corresponding side has a corresponding bent profile, so that the solid structure and the trabecular structure can be closely attached and uniformly stressed at the bending point. This solves the problem of stress concentration and trabecular delamination that easily occur at the corners of the lumbosacral prosthesis, improves the contact area and initial stability between the prosthesis and the host bone, promotes osseointegration, and reduces the risk of revision surgery.

[0014] Furthermore, the sacral prosthesis has a first mounting hole and a plurality of second mounting holes; the first mounting hole is located in the area corresponding to the intersection of the vertical part and the horizontal part, and is used for fasteners to pass through to anchor the fifth lumbar vertebra; each of the second mounting holes is located in the area corresponding to the vertical part, and is used for fasteners to pass through to fix the sacrum; the first mounting hole and each of the second mounting holes both start from the outer surface of the first solid structure away from the first trabecular structure, and sequentially penetrate the first solid structure and the first trabecular structure, and the openings at the outer surface of the first solid structure are all oblong.

[0015] By adopting the above technical solution, a first mounting hole located at the junction of the horizontal and vertical parts and multiple second mounting holes located in the vertical part are opened on the sacral prosthesis. These are used for fasteners to pass through to anchor the fifth lumbar vertebra and fix the sacrum, respectively. This allows the prosthesis to obtain stable mechanical anchorage at both the lumbar and sacral levels, improving early fixation strength. Each mounting hole extends sequentially from the outer surface of the first solid structure to the first trabecular bone structure, and the openings at the outer surface of the first solid structure are all oblong. The oblong openings provide a certain range of positional adjustment margin for the fasteners, making it easier for the surgeon to flexibly select the optimal screw path during surgery based on the patient's bone condition and bone tunnel direction, avoiding bone defects or low-density areas, improving screw holding force, and reducing the difficulty of intraoperative adjustment.

[0016] Furthermore, the iliac wing prosthesis includes a second solid structure and a second trabecular bone structure disposed on the bone contact surface side of the second solid structure; the second trabecular bone structure fits into the osteotomy surface of the iliac bone; the concave hole is disposed on the second solid structure.

[0017] By adopting the above technical solution, the iliac wing prosthesis is also designed as a composite configuration combining a second solid structure and a second trabecular structure. The second solid structure provides overall mechanical strength and provides stable wall thickness for the concave hole that accommodates the convex column, while the second trabecular structure is responsible for adhering to the host iliac bone section and inducing bone ingrowth. This allows the load-bearing part and the biological fixation part on the iliac wing side to be functionally separated and do not interfere with each other, thereby improving the overall mechanical properties and long-term biological fixation effect of the prosthesis.

[0018] Furthermore, the iliac wing prosthesis is provided with a third mounting hole, a fourth mounting hole, and a fifth mounting hole; the third mounting hole, the fourth mounting hole, and the fifth mounting hole are respectively used for fasteners to penetrate and connect to the ischium, pubis, and anterior inferior iliac spine.

[0019] By employing the aforementioned technical solution, a third mounting hole for connecting to the ischium, a fourth mounting hole for connecting to the pubis, and a fifth mounting hole for connecting to the anterior inferior iliac spine are respectively opened on the iliac wing prosthesis. This allows the iliac wing prosthesis to be simultaneously anchored at three anatomical sites: the ischium, pubis, and anterior inferior iliac spine, forming a multi-point stable fixation pattern. This restores the geometric integrity and force transmission path of the pelvic ring, improves early postoperative weight-bearing stability, and reduces the risk of prosthesis loosening. More importantly, because this prosthesis has an adjustable angle function, the mounting holes on the iliac wing prosthesis can be more precisely aligned with the patient's remaining ischium, pubis, and anterior inferior iliac spine. This avoids the risk of screws penetrating soft tissue or the edge of the bone cortex due to angle deviation in traditional one-piece prostheses, achieving synergy between angle adjustment and multi-point anchoring.

[0020] Furthermore, the third mounting hole, the fourth mounting hole, and the fifth mounting hole all extend sequentially through the second solid structure and the second trabecular structure from the outer surface of the second solid structure, and the openings at the outer surface of the second solid structure are all oblong.

[0021] By adopting the above technical solution, the third, fourth, and fifth mounting holes are all designed to pass through the second solid structure and the second trabecular bone structure sequentially from the outer surface of the second solid structure, and the openings at the outer surface are all in an elongated oval shape. The elongated oval openings allow the fasteners to adjust the position and angle of the screws within a certain range, which makes it easier for doctors to select the best screw path according to the actual bone orientation of the ischium, pubis, and anterior inferior iliac spine, avoiding screw misalignment caused by bone path deviation during surgery, and improving the fit and holding force between the fasteners and the residual bone.

[0022] Furthermore, the second physical structure has multiple spaced muscle suture holes.

[0023] By employing the above-mentioned technical solution, multiple spaced muscle suture holes are created in the second solid structure, facilitating the secure connection of surrounding soft tissues, muscles, and ligaments to the prosthesis via sutures passing through these holes during surgery. Since the prosthesis angle has been adjusted to the position most consistent with the patient's anatomical shape using an angle-adjusting locking component, the muscle tissue sutured through these muscle suture holes can better restore its original physiological tension and balance, improving the functional rehabilitation of the affected limb and reducing the possibility of infection and effusion in the soft tissue cavities around the prosthesis.

[0024] Furthermore, the outer surface of the second solid structure opposite to the second trabecular structure is provided with an external slot, which is used to connect with the orthopedic nail and rod system.

[0025] By adopting the above technical solution, an external groove is opened on the outer surface of the second solid structure that is away from the second trabecular bone structure, so that the iliac wing prosthesis can be connected with the orthopedic screw-rod system. In complex cases involving extensive bone resection or spinal-pelvic reconstruction, the screw-rod system can be used to further bridge and fix the prosthesis to the upper spine or the lower residual bone, expanding the clinical applicability of the prosthesis and improving the mechanical stability of the overall reconstruction structure.

[0026] In summary, this application includes at least one of the following beneficial technical effects: This application solves the problem of traditional hemipelvic prostheses having a fixed shape and being difficult to adapt to the anatomical differences of different patients' pelvises by setting an angle-adjusting locking assembly consisting of a pivot part, a pivot part and a locking element between the sacral prosthesis and the iliac wing prosthesis. This allows the two prostheses to be adjusted and locked in relative rotation around a coaxial pivot axis. It avoids excessive osteotomy to adapt to the integrated prosthesis, preserves the host bone volume to the maximum extent, and reduces the traction damage to the surrounding soft tissues caused by forced reduction during surgery. This application implements the pivot part and the pivot seat part as a plug-in fit between a convex post and a concave hole, and uses a long round sliding hole extending along the axial direction of the concave hole to fit the locking part to achieve continuous angle adjustment and surface contact locking, so that the angle adjustment locking assembly has high load-bearing capacity, convenient adjustment and reliable self-locking performance. This application improves the fit and osseointegration between the prosthesis and the host bone by designing both the sacral prosthesis and the iliac wing prosthesis as composite structures combining solid structures and trabecular bone structures, and by adopting a curved contour in the lumbosacral region that matches the shape of the fifth lumbar vertebra and the sacrum. At the same time, the angle adjustment function allows the installation holes and suture holes on the prosthesis to be precisely aligned with the remaining bone and soft tissue, achieving a high degree of synergy between structural adjustment and anatomical anchoring. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of a rotatable hemipelvic prosthesis as described in the embodiment; Figure 2This is a schematic diagram of the structure of the pivot section described in the embodiment; Figure 3 This is a schematic diagram of the structure of the pivot portion described in the embodiment; Figure 4 This is a schematic diagram of the sacral prosthesis described in the embodiment; Figure 5 This is a schematic diagram of the iliac wing prosthesis described in the embodiment.

[0028] In the diagram: 1. Sacral prosthesis; 11. First solid structure; 12. First trabecular structure; 121. Horizontal part; 122. Vertical part; 13. First mounting hole; 14. Second mounting hole; 2. Iliac wing prosthesis; 21. Second solid structure; 22. Second trabecular structure; 23. Third mounting hole; 24. Fourth mounting hole; 25. Fifth mounting hole; 26. Muscle suture hole; 27. External groove hole; 3. Angle-adjusting locking assembly; 31. Locking element; 32. Pivot part; 321. Protruding post; 322. Fastening bottom hole; 33. Pivot seat part; 331. Concave hole; 332. Sliding hole. Detailed Implementation

[0029] The technical solutions of various embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Example 1

[0030] refer to Figure 1 This application discloses a rotatable hemipelvic prosthesis, including a sacral prosthesis 1 for fitting with the sacral osteotomy surface and an iliac wing prosthesis 2 for fitting with the iliac osteotomy surface; an angle-adjusting locking assembly 3 is provided between the sacral prosthesis 1 and the iliac wing prosthesis 2; the angle-adjusting locking assembly 3 includes a locking member 31, and a pivot portion 32 and a pivot seat portion 33 respectively provided at the connection between the sacral prosthesis 1 and the iliac wing prosthesis 2; the pivot portion 32 is fitted into the pivot seat portion 33, and the two have a coaxial pivot axis; the angle-adjusting locking assembly 3 has an angle adjustment state and a locked state: when in the angle adjustment state, the locking member 31 is in a loose state to allow the sacral prosthesis 1 and the iliac wing prosthesis 2 to rotate relative to each other around the pivot axis; when in the locked state, the locking member 31 is tightened to lock and fix the sacral prosthesis 1 and the iliac wing prosthesis 2 relative to each other, thereby limiting their relative rotation.

[0031] refer to Figure 2 and Figure 3Specifically, the angle-adjusting locking assembly 3 includes a locking member 31, a pivot portion 32, and a pivot seat portion 33. The pivot portion 32 includes a protrusion 321 disposed on the connecting end of the sacral prosthesis 1. The protrusion 321 is typically cylindrical and can be made of high-strength titanium alloy, which has good biocompatibility and strength. Alternatively, other metal materials suitable for human implantation, such as cobalt-chromium-molybdenum alloy, can also be used. The pivot seat portion 33 includes a recess 331 disposed within the connecting end of the iliac wing prosthesis 2. The connecting end of the iliac wing prosthesis 2 is a cylindrical boss protruding from the body, and the connecting end of the sacral prosthesis 1 has a circular abutment surface adapted to the boss. The shape of the recess 331 is adapted to the protrusion 321, and it is generally a circular hole, also made of a metal material suitable for human implantation. It should be noted that although the pivot portion 32 is disposed on the sacral prosthesis 1 and the pivot seat portion 33 is disposed on the iliac wing prosthesis 2 in this embodiment, the positions of the two can be completely interchanged in other optional embodiments of this application. That is, the pivot portion 32 can also be disposed on the connecting end of the iliac wing prosthesis 2, while the pivot seat portion 33 is correspondingly disposed in the connecting end of the sacral prosthesis 1, and the sliding hole 332 is opened on the surface of the sacral prosthesis 1. This interchangeability of male and female structures can also achieve the technical effect of angle adjustment and locking of this application, and both are within the protection scope of this application. The surface of the iliac wing prosthesis 2 is provided with a sliding hole 332 that communicates with the interior of the recessed hole 331. The sliding hole 332 is an elongated hole extending axially along the recessed hole 331. The sliding hole 332 is provided with a stepped surface; the fastening bottom hole 322 is an internally threaded hole; the locking member 31 is a screw. A part of the locking member 31 passes through the sliding hole 332 and is fastened to the fastening bottom hole 322. When in the angle adjustment state, the locking member 31 is in the loose state, at which time the protrusion 321 can rotate around the pivot axis within the concave hole 331. When in the locked state, the locking member 31, acting as a screw, is tightened into the internal threaded hole, with its head pressing against the stepped surface of the sliding hole 332, thereby locking and fixing the sacral prosthesis 1 and the iliac wing prosthesis 2 relative to each other. The stepped surface design increases the contact area during locking, effectively improving the resistance to shear friction. The outer peripheral wall of the protrusion 321 is conical, and the inner sidewall of the concave hole 331 is also conical to match the protrusion 321.

[0032] refer to Figure 4The sacral prosthesis 1 includes a first solid structure 11 and a first trabecular structure 12 located on the bone contact surface of the first solid structure 11. The first solid structure 11 mainly serves a supporting function and is usually made of a metallic material, such as titanium alloy. The first trabecular structure 12 is bent and includes a transverse portion 121 for conforming to the fifth lumbar vertebra and a vertical portion 122 for conforming to the sacrum. Its material is preferably a porous titanium metal material integrally formed using 3D printing technology such as electron beam melting or selective laser melting, with a porosity preferably of 60%-80% and a pore size preferably of 300-500 μm. This material facilitates bone ingrowth and promotes the fusion of the prosthesis with the human skeleton. The side surface of the first solid structure 11 that supports the first trabecular structure 12 has a corresponding bent profile, which allows for better fit with the first trabecular structure 12 and provides stable support. The sacral prosthesis 1 has a first mounting hole 13 and multiple second mounting holes 14. The first mounting hole 13 is located in the area corresponding to the transverse portion 121, for fasteners to pass through and anchor the fifth lumbar vertebra; each of the second mounting holes 14 is located in the area corresponding to the vertical portion 122, for fasteners to pass through and fix the sacrum. Both the first mounting hole 13 and each of the second mounting holes 14 extend sequentially through the first solid structure 11 and the first trabecular structure 12, starting from the outer surface of the first solid structure 11 away from the first trabecular structure 12, and the openings on the outer surface of the first solid structure 11 are all elongated oval. The elongated oval opening design can accommodate, to some extent, minor adjustments to the fastener installation position during surgery, improving installation flexibility. Furthermore, precise adjustment of the prosthesis angle allows the first trabecular structure 12 to fit tightly against the host bone osteotomy surface under optimal compressive stress. Appropriate compressive stress effectively induces bone cell ingrowth, thereby synergizing with the angle-adjusting locking component 3 and accelerating the postoperative biological fixation process.

[0033] refer to Figure 5The iliac wing prosthesis 2 includes a second solid structure 21 and a second trabecular structure 22 located on the bone contact surface side of the second solid structure 21. The second solid structure 21 is also made of a metal material suitable for human implantation, providing structural support for the entire iliac wing prosthesis 2. The second trabecular structure 22 fits against the iliac osteotomy surface to induce bone ingrowth and promote long-term biofusion between the prosthesis and the human skeleton. A recess 331 is provided on the second solid structure 21. The iliac wing prosthesis 2 has a third mounting hole 23, a fourth mounting hole 24, and a fifth mounting hole 25. The third mounting hole 23, the fourth mounting hole 24, and the fifth mounting hole 25 are respectively used for fasteners to penetrate and connect to the ischium, pubis, and anterior inferior iliac spine. Thanks to the adjustable angle provided by the angle-adjusting locking component 3, after the prosthesis angle is adjusted during surgery, the third mounting hole 23, the fourth mounting hole 24, and the fifth mounting hole 25 can be more precisely aligned with the remaining bone-rich areas of the patient's ischium, pubis, and anterior inferior iliac spine, avoiding screw misalignment or cortical bone perforation due to prosthesis angle mismatch. These mounting holes all extend sequentially from the outer surface of the second solid structure 21 through the second solid structure 21 and the second trabecular bone structure 22, and the openings on the outer surface of the second solid structure 21 are all oblong, also to improve installation flexibility. The second solid structure 21 has multiple spaced muscle suture holes 26, which can be used to suture and fix muscle tissue, enhancing the connection stability between the prosthesis and surrounding tissues. Since the prosthesis angle has been adjusted to the position that best matches the patient's anatomical shape, the sutured muscle tissue can better restore its original physiological tension. The second solid structure 21 has an external slot 27 on its outer surface opposite to the second trabecular structure 22. It is connected to the orthopedic screw and rod system through a U-shaped nail to further enhance the fixation effect of the prosthesis.

[0034] The implementation principle of this embodiment is as follows: The rotatable hemipelvic prosthesis of this embodiment achieves flexible adjustment and locking of the angle between the sacral prosthesis 1 and the iliac wing prosthesis 2 through the angle-adjusting locking component 3. During the operation, the surgeon can first align the sacral prosthesis 1 with the sacral osteotomy surface and the iliac wing prosthesis 2 with the iliac osteotomy surface. Then, according to the patient's specific condition, the locking component 31 is loosened, so that the sacral prosthesis 1 and the iliac wing prosthesis 2 are in an angle-adjustable state, rotating relative to each other around the pivot axis. After continuously fine-tuning to a suitable angle in situ, the thickened screw, which serves as the locking component 31, is tightened, and the two are firmly locked by the strong axial clamping force. At the same time, fasteners are used to precisely fix the prosthesis to the human skeleton through various mounting holes, muscle tissue is sutured and fixed through muscle suture holes 26, and the external slot hole 27 is used to connect with the orthopedic screw and rod system to further enhance the fixation effect. This design significantly reduces the difficulty of surgery, avoids excessive osteotomy, preserves host bone volume, facilitates installation and suturing, and promotes bone ingrowth through optimal stress transmission, thereby improving the stability and durability of the prosthesis. Compared with existing technologies, this represents a significant improvement and enhancement.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this application.

Claims

1. A rotatable hemipelvic prosthesis, characterized in that, The device includes a sacral prosthesis (1) for fitting against the osteotomy surface of the sacrum and an iliac wing prosthesis (2) for fitting against the osteotomy surface of the iliac bone; an angle-adjusting locking assembly (3) is provided between the sacral prosthesis (1) and the iliac wing prosthesis (2); the angle-adjusting locking assembly (3) includes a locking member (31), and a pivot portion (32) and a pivot seat portion (33) respectively located at the connection between the sacral prosthesis (1) and the iliac wing prosthesis (2); the pivot portion (32) is fitted into the pivot seat portion (33). The two are connected by a coaxial pivot axis; the angle-adjusting locking assembly (3) has an angle-adjusting state and a locking state: when in the angle-adjusting state, the locking member (31) is in the loose state to allow the sacral prosthesis (1) and the iliac wing prosthesis (2) to rotate relative to each other about the pivot axis; when in the locking state, the locking member (31) is tightened to lock the sacral prosthesis (1) and the iliac wing prosthesis (2) relative to each other, thereby limiting their relative positions.

2. The rotatable hemipelvic prosthesis according to claim 1, characterized in that, The pivot portion (32) includes a protrusion (321) disposed on the connecting end of the sacral prosthesis (1), and the pivot seat portion (33) includes a recess (331) disposed in the connecting end of the iliac wing prosthesis (2); the iliac wing prosthesis (2) is provided with a sliding hole (332) communicating with the interior of the recess (331), and the protrusion (321) is provided with a fastening bottom hole (322) at the position corresponding to the sliding hole (332); a part of the locking member (31) passes through the sliding hole (332) and is fastened to the fastening bottom hole (322).

3. The rotatable hemipelvic prosthesis according to claim 2, characterized in that, The sliding hole (332) is an elongated hole extending axially along the concave hole (331), and the sliding hole (332) has a stepped surface; the fastening bottom hole (322) is an internal threaded hole; the locking element (31) is a screw.

4. The rotatable hemipelvic prosthesis according to claim 2, characterized in that, The sacral prosthesis (1) includes a first solid structure (11) and a first trabecular structure (12) disposed on the bone contact surface side of the first solid structure (11); the protruding post (321) is disposed on the first solid structure (11); the first trabecular structure (12) is bent and includes a transverse portion (121) for conforming to the fifth lumbar vertebra and a vertical portion (122) for conforming to the sacrum; the side surface of the first solid structure (11) for supporting the first trabecular structure (12) has a corresponding bent profile.

5. The rotatable hemipelvic prosthesis according to claim 4, characterized in that, The sacral prosthesis (1) is provided with a first mounting hole (13) and a plurality of second mounting holes (14); the first mounting hole (13) is located in the area corresponding to the vertical part (122) and the horizontal part (121), and is used for fasteners to pass through to anchor the fifth lumbar vertebra; each of the second mounting holes (14) is located in the area corresponding to the vertical part (122), and is used for fasteners to pass through to fix the sacrum; the first mounting hole (13) and each of the second mounting holes (14) are both connected to the first solid structure (11) from the outer surface of the first trabecular structure (12) and pass through the first solid structure (11) and the first trabecular structure (12) in sequence, and the openings at the outer surface of the first solid structure (11) are all oblong.

6. The rotatable hemipelvic prosthesis according to claim 2, characterized in that, The iliac wing prosthesis (2) includes a second solid structure (21) and a second trabecular structure (22) disposed on the bone contact surface side of the second solid structure (21); the second trabecular structure (22) fits against the osteotomy surface of the iliac bone; the concave hole (331) is disposed on the second solid structure (21).

7. The rotatable hemipelvic prosthesis according to claim 6, characterized in that, The iliac wing prosthesis (2) is provided with a third mounting hole (23), a fourth mounting hole (24) and a fifth mounting hole (25); the third mounting hole (23), the fourth mounting hole (24) and the fifth mounting hole (25) are respectively used for fasteners to penetrate to connect the ischium, pubis and anterior inferior iliac spine.

8. The rotatable hemipelvic prosthesis according to claim 7, characterized in that, The third mounting hole (23), the fourth mounting hole (24) and the fifth mounting hole (25) all extend from the outer surface of the second solid structure (21) through the second solid structure (21) and the second trabecular structure (22) in sequence, and the openings at the outer surface of the second solid structure (21) are all oblong.

9. The rotatable hemipelvic prosthesis according to claim 6, characterized in that, The second physical structure (21) has multiple spaced muscle suture holes (26).

10. The rotatable hemipelvic prosthesis according to claim 6, characterized in that, The second solid structure (21) has an external slot (27) on its outer surface opposite to the second trabecular structure (22), which is used to connect with the orthopedic nail and rod system.

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