Modular universal bone integrating hemipelvic prosthesis

Abstract

The application relates to a universal assembled bone-integrated half-pelvis prosthesis, which comprises a universal assembled sacrum bone-integrated base, an assembled multi-angle adjustable acetabulum and pelvis ring supporting assembly, and a universal assembled pubis bone-integrated base, wherein the universal assembled sacrum bone-integrated base, the assembled multi-angle adjustable acetabulum and pelvis ring supporting assembly, and the universal assembled pubis bone-integrated base have several different models, when the three are assembled, by selecting different models, the adjustment of the overall direction and height of the pelvis ring and the adjustment of the size of the acetabulum cup and the anteversion angle and inclination angle of the acetabulum cup accessory in the assembled multi-angle adjustable acetabulum and pelvis ring supporting assembly are realized. The half-pelvis prosthesis has wide universality, the corresponding pre-produced prosthesis component models can be conveniently selected in preoperative design, special customization is not needed according to the patient condition, and the preoperative design and preparation time of the half-pelvis replacement surgery is greatly saved.

Description

Technical Field

[0001] This invention relates to the field of artificial hemipelvic prosthesis technology, specifically to a modular universal osseointegrated hemipelvic prosthesis. Background Technology

[0002] The pelvis is a common site for bone tumors. Due to the complex anatomy of the pelvis, reconstructing the function of the hemipelvis after tumor resection is a significant challenge for bone oncologists. Currently, the classification of pelvic tumor resection and reconstruction is mainly based on the Enneking classification, and is anatomically divided into: Type I: iliac bone resection; Type II: periacetabular resection; Type III: ischium and pubis resection; Type IV: resection involving the sacrum. For malignant pelvic tumors in Enneking I, II, and III zones, the task of reconstructing a hemipelvic prosthesis is particularly difficult due to a series of challenges, including the large resection area, the difficulty in determining the fixation method, and the challenge in determining the acetabular reconstruction location.

[0003] Currently, pelvic reconstruction primarily employs various methods, including artificial prosthesis reconstruction, arthroplasty, allogeneic bone reconstruction, and autologous tumor bone inactivation and reimplantation. Among these, arthroplasty, allogeneic bone reconstruction, and autologous tumor bone inactivation and reimplantation have been phased out due to high infection rates, limited bone source availability, and high risks of tumor recurrence. Currently, artificial hemipelvic prosthesis reconstruction is gradually becoming the dominant method in the treatment of pelvic malignancies due to its better initial stability, more acceptable appearance, and relatively faster functional recovery. To date, the most commonly used prostheses in clinical practice are fully custom-made prostheses, designed and customized based on the anatomical structure of the patient's healthy pelvis. While this approach offers advantages such as high precision and good fit, it still has some drawbacks.

[0004] First, in actual clinical applications, integrated custom-made prostheses often present installation difficulties in complex pelvic structures and confined spaces, requiring extensive dissection of soft tissues, resulting in significant damage to associated tissues and impacting postoperative recovery. Furthermore, limited surgical space may prevent the precise installation of large prostheses within the pre-designed area, affecting fixation and leading to poor follow-up outcomes. Second, fully custom-made prostheses involve complex designs, requiring extensive clinical data collection for individualized customization, resulting in high design costs, extended timeframes, and increased expenses for patients. Third, fully custom-made prostheses require customized production, necessitating individual prosthesis manufacturing for each patient, leading to high costs, long production times, and extended patient waiting periods. Finally, fully custom-made prostheses require precise preoperative data processing to ensure a high degree of matching between the prosthesis and the patient's pelvic anatomy. During the relatively long production cycle, if the patient's condition progresses, the pelvic structure deteriorates further, or a pathological fracture occurs, the already produced prosthesis becomes unusable, potentially extending the production cycle further. Meanwhile, preoperative data collection is based on imaging data, which is difficult to accurately match with the actual intraoperative situation. In practical applications, fully customized prostheses often have room for adjustment in details. Summary of the Invention

[0005] To address the shortcomings of existing fully customized hemipelvic prostheses, reduce the design and manufacturing complexity and time, and improve the adaptability of hemipelvic prostheses, this invention provides a novel modular universal triaxial adjustable osseointegrated hemipelvic prosthesis with universal characteristics. This prosthesis allows for the adjustment of various parameters through assembly. It utilizes three components: a universal modular sacral osseointegration base, a modular triaxial adjustable acetabular and pelvic ring support assembly, and a universal modular pubic osseointegration base. Through a specially designed spline structure, it adapts to the complex anatomy of the pelvis and acetabulum, giving the prosthesis broad versatility. Pre-produced prosthesis component models can be easily selected during preoperative planning, eliminating the need for special customization based on the patient's condition and significantly saving preoperative design and preparation time for hemipelvic replacement surgery. Furthermore, due to its modular nature, the volume of the corresponding components is significantly smaller than that of semi-customized and fully customized prostheses, facilitating installation during surgery through smaller surgical incisions and tissue dissection. Universal interface designs between components ensure good compatibility and fixation. This reduces design and manufacturing costs and time, thus lessening the medical burden and time costs for patients. Furthermore, the modular assembly method allows for greater operational flexibility during surgery, facilitating precise installation of individual components, resulting in better fixation, improved postoperative quality of life for patients, and extended prosthesis lifespan.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A modular universal osseointegrated hemipelvic prosthesis includes a modular sacral osseointegration base, a modular multi-angle adjustable acetabulum and pelvic ring support assembly, and a modular pubic osseointegration base. The modular sacral osseointegration base, the modular multi-angle adjustable acetabulum and pelvic ring support assembly, and the modular pubic osseointegration base each have several different models.

[0008] The modular multi-angle adjustable acetabular and pelvic ring support assembly connects the sacral end to the auricular surface and the osteotomy area on the dorsal side of the sacrum via the universal modular sacral ossification base, and the pubic end to the opposite pubic bone via the universal modular pubic ossification base. When assembling the universal modular sacral ossification base, the modular multi-angle adjustable acetabular and pelvic ring support assembly, and the universal modular pubic ossification base, different models can be selected to adjust the overall direction and height of the pelvic ring, as well as the size, anteversion angle, and tilt angle of the acetabular cup in the modular multi-angle adjustable acetabular and pelvic ring support assembly.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] (1) The hemipelvic prosthesis proposed in this invention utilizes a universal modular pubic osseointegration base to form the pubic symphysis and can form osseointegration on both sides of the sacrum and pubis, thereby forming a complete pelvic ring structure. It can effectively resist shear stress, has good stability and patient prognosis, effectively reduces the risk of complications and tumor recurrence, and greatly reduces patient pain and economic burden.

[0011] (2) The sacral and pubic bone integration base and the acetabular component in the hemipelvic prosthesis proposed in this invention are designed with a universal modular structure, which provides better flexibility for the installation of the prosthesis, facilitates the precise fixation of the components separately during the operation, improves the patient's prognosis, and reduces the design and production cycle and cost, reduces the patient's medical burden and waiting time. Moreover, the hemipelvic prosthesis uses pubic symphysis and iliac bone plate for dual biological fixation, which has good biomechanical stability and long-term stability.

[0012] (3) In the hemipelvic prosthesis proposed in this invention, all prosthesis components can be set with fixed models within a certain size range and pre-produced. In clinical application, it is only necessary to select the corresponding model according to the actual situation of the patient for matching and installation, which greatly saves the time of preoperative design and prosthesis manufacturing, improves the versatility of the prosthesis, and reduces the patient's waiting time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the modular universal osseointegrative hemipelvic prosthesis described in this invention.

[0014] Figure 2 This is a schematic diagram of the sacral auricular prosthesis in this invention;

[0015] Figure 3 This is a schematic diagram of the external spline shaft in this invention;

[0016] Figure 4 This is a schematic diagram of the wheel-shaped multi-tooth structure in this invention;

[0017] Figure 5 This is a schematic diagram of the acetabular cup accessory in this invention;

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. External spline shaft; 1-1. Screw hole groove; 1-2. Locking screw hole; 2. Sacral auricular surface prosthesis; 2-1. Second locking screw hole; 2-2. Osteointegration screw; 2-3. Internal spline hole groove; 2-4. Screw hole; 3. Wheel-shaped multi-tooth structure; 3-1. Cylindrical fixation shaft; 4. Acetate cup body; 5. Crossbeam structure; 6. Spline structure; 7. Locking screw hole. Detailed Implementation

[0020] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

[0021] This invention proposes a modular universal osseointegrated hemipelvic prosthesis, which is implanted into the patient after partial removal of the affected side's sacrum, all of the iliac bone, and pubis. The modular universal osseointegrated hemipelvic prosthesis comprises three components: ① a modular sacral osseointegration base; ② a modular multi-angle adjustable acetabulum and pelvic ring support assembly; and ③ a modular pubic osseointegration base. Furthermore, the modular sacral osseointegration base, the modular multi-angle adjustable acetabulum and pelvic ring support assembly, and the modular pubic osseointegration base are available in several different models, allowing for the selection of the appropriate model based on actual needs when assembling these three components.

[0022] Specifically, the sacral end of the modular multi-angle adjustable acetabular and pelvic ring support component is connected to the auricular surface of the sacrum and the osteotomy area on the dorsal side of the sacrum via a universal modular sacral ossification base, while the pubic end is connected to the contralateral pubic bone via a universal modular pubic ossification base. When assembling the universal modular sacral ossification base, the modular multi-angle adjustable acetabular and pelvic ring support component, and the universal modular pubic ossification base, different models can be selected to adjust the overall direction and height of the pelvic ring, as well as the size, anteversion angle, and tilt angle of the acetabular cup component within the modular multi-angle adjustable acetabular and pelvic ring support component. The modular structural design of the universal modular sacral ossification base, the modular multi-angle adjustable acetabular and pelvic ring support component, and the universal modular pubic ossification base provides greater flexibility for prosthesis installation, facilitates precise fixation of components separately during surgery, and improves patient outcomes. This also reduces design and production cycles and costs, and reduces the medical burden and waiting time for patients.

[0023] ① Universal Modular Sacral Osteointegration Base: The universal modular sacral osteointegration base is used to connect the hemipelvic prosthesis to the auricular surface of the sacrum. On one side of the sacrum, the osteotomy area of ​​the auricular surface and the dorsal side of the sacrum is determined through preoperative design. During surgery, a guide plate is used for osteotomy, so that the auricular surface and its dorsal bone surface form a fan-shaped structure corresponding to the prosthesis design. For example... Figure 1 As shown, the universal modular sacral osseointegration base includes an auricular base, an external spline shaft 1, and a base cover. The auricular base is a fan-shaped structure composed of a sacral auricular side prosthesis 2 and a sacral dorsal side prosthesis at a preset angle. The universal modular sacral osseointegration base is divided into various models according to different gradients of the preset angle. For example, the preset angle range of the auricular base is 90° to 140°, and various models can be set with an angle gradient of 10°.

[0024] Among them, such as Figure 2As shown, the sacral auricular prosthesis 2 is a rectangular shape with rounded edges, i.e., a rounded rectangle, with a width ranging from 50mm to 100mm, differentiated by 10mm increments. The sacral auricular prosthesis 2 is tightly connected to the osteotomy area of ​​the sacral auricular surface after osteotomy, and the contact surface is provided with a metal trabecular structure to facilitate bone ingrowth. The sacral auricular prosthesis 2 has at least two second locking screw holes 2-1, pointing towards the S1 and S2 bones respectively, for installing osseointegration screws 2-2. The osseointegration screws 2-2 fix the sacral auricular prosthesis 2 to the osteotomy area of ​​the sacral auricular surface through the second locking screw holes 2-1. The screw length of the osseointegration screws 2-2 is selected according to the actual width of the sacrum, and the surface of the osseointegration screws 2-2 has a microporous structure, which allows for good osseointegration with the sacrum. The dorsal sacral prosthesis is a rectangular structure of the same length as the auricular sacral prosthesis 2, with a width ranging from 20mm to 50mm, differentiated by 10mm increments. The dorsal sacral prosthesis is in close contact with the osteotomy area on the dorsal sacral side after osteotomy, and the contact surface is equipped with a metal trabecular structure to facilitate bone ingrowth. The dorsal sacral prosthesis has at least one first locking screw hole for installing an osseointegration screw perpendicular to the dorsal surface. The osseointegration screw fixes the dorsal sacral prosthesis to the osteotomy area on the dorsal sacral side through the first locking screw hole. The screw length is based on the actual thickness of the sacrum. The thickness of the auricular sacral prosthesis 2 ranges from 10mm to 20mm, and the thickness of the dorsal sacral prosthesis ranges from 5mm to 15mm.

[0025] At the center of the sacral auricular prosthesis 2, there is a spline connection structure, namely the inner spline slot 2-3. The inner spline teeth are designed with a minimum rotation angle of 10°. At the center of the inner spline slot 2-3, there is a screw hole 2-4 for pressing and fixing the spline structure. The height of the inner spline slot is 20–50 mm, the inner diameter is 25–40 mm, the outer diameter is 35–50 mm, and the inner spline wall thickness is 10 mm. The outer spline shaft 1 is designed as a cylinder 10–20 mm higher than the height of the inner spline slot 2-3. At its center, there is a through screw slot 1-1 and a locking screw hole 1-2. Figure 3As shown, this is used for fixing the inner and outer spline structures. The cylindrical surface of the outer spline shaft 1, which protrudes above the inner spline groove 2-3, is smooth, and a semi-circular groove is provided on the outer cylindrical surface. The interior of the semi-circular groove has toothed protrusions, which are used to connect and lock the sacral auricular prosthesis 2 to the sacral pelvic ring accessory in the modular multi-angle adjustable acetabulum and pelvic ring support assembly. The semi-circular groove is 5mm thick and 20mm deep, used for connecting and locking with the sacral pelvic ring accessory in the pelvic ring structure. On both sides of the semi-circular groove, four screw holes are horizontally arranged along the center point of the groove, in groups of two, symmetrically arranged. A semi-cylindrical recess is provided at the midpoint of two groups of screw holes, used to lock the sacral pelvic ring accessory to the outer surface of the outer spline shaft 1 in conjunction with the fixing shaft and base cover of the sacral pelvic ring accessory. The base cover covers the outer surface of the component and the sacral pelvic ring accessory, which are exposed on the outer side after installation. The surface of the cover is smooth and dome-shaped. There is a third locking screw hole on the bottom of the cover corresponding to the outer surface of the base, which is used to fix the base cover, the sacral pelvic ring accessory and the ear-shaped base outer surface with locking screws.

[0026] ② Modular Multi-Angle Adjustable Acetabular and Pelvic Ring Support Component: This component specifically includes a sacral pelvic ring accessory, an acetabular cup accessory, and a pubic pelvic ring accessory. Each of these accessories comes in several different models. By selecting different models of the sacral pelvic ring accessory and pubic pelvic ring accessory, and rotating the spline structure on the universal modular sacral osseointegration base and the universal modular pubic osseointegration base, the position of the acetabular cup can be adjusted in the horizontal and vertical directions. The height can also be adjusted along the line connecting the midpoint of the upper and lower edges of the auricular surface and the midpoint of the upper and lower edges of the pubic symphysis surface. By selecting the model and installation direction of the acetabular cup accessory, the size, anteversion angle, and tilt angle of the acetabular cup can be adjusted.

[0027] (1) Design of the sacral pelvic ring fitting: The sacral pelvic ring fitting is a cylinder with a certain curvature. One end, corresponding to the connection between the sacrum and the pubic bone base, has several pre-set through holes on its surface for suturing the patch. Morphologically, the sacral pelvic ring fitting includes a curved cylinder with a certain curvature and interface structures on both sides. The interface structure pointing to the universal modular sacral osseointegration base matches the interface design on the base, and is a wheel-shaped multi-tooth structure 3, such as... Figure 4As shown, the toothed semi-circular groove on the outer surface of the base engages with the wheel-shaped multi-tooth structure 3, which merges with the arc-shaped cylindrical structure at the tail. The arc of the wheel-shaped multi-tooth structure 3 is 300°. Two cylindrical fixing shafts 3-1 are symmetrically arranged laterally at the center of the wheel-shaped multi-tooth structure 3, which cooperate with the fixing points on the outer surface of the base to achieve fixation of the sacral pelvic ring accessory and the universal modular sacral bone integration base. The arc of the arc-shaped cylinder in the sacral pelvic ring accessory is set in three groups: 15°, 30°, and 45°. Several different radius values ​​are set under each group of arcs. By setting different radius values, the actual span is determined. In actual use, the arc and span of the corresponding area of ​​the healthy pelvis can be measured preoperatively to pre-select the required group, and the available accessories can be selected during the operation according to the actual situation. The interface structure between the sacral pelvic ring accessory and the acetabular cup accessory is a matching spline structure, and the two are fixed together by locking screws. As an optional implementation, the interface structure between the sacral pelvic ring accessory and the acetabular cup accessory is a gear-shaped slot. This slot is used to adjust the acetabular anteversion angle, with a depth of 1-2 cm. The center of the slot is the geometric center of the arc-shaped cylinder. A locking screw hole is provided at the bottom of the slot, allowing the locking screw to be screwed in to fix the position of the acetabular cup accessory. In application, the gear-shaped slot structure mates with the gear-shaped insertion of the acetabular cup, enabling the acetabular cup to rotate and adjust its position around the tangent of the pelvic ring. As another optional implementation, the interface structure between the sacral pelvic ring accessory and the acetabular cup accessory is designed as an external spline structure for connection with the internal spline structure in the acetabular accessory. A locking screw hole is provided 0.5-1 cm from the tip of the spline structure to facilitate the fixation of the acetabular cup accessory.

[0028] (2) Design of acetabular cup fittings: such as Figure 5As shown, the acetabular cup accessory includes an acetabular cup body 4 and a crossbeam structure 5 that is parallel to the diameter of the acetabular cup at the bottom of the acetabular cup body 4 and passes above the acetabular cup body 4. The middle section of the crossbeam structure 5 has a cylindrical cross-section with a diameter of 2-4 cm and a length of 80% of the diameter of the acetabular cup. Both ends are spline structures 6 that match the interface structures of the sacral pelvic ring accessory and the pubic pelvic ring accessory. When the interface structure of the sacral pelvic ring accessory and the pubic pelvic ring accessory is an external spline structure, the two ends of the crossbeam structure 5 are internal spline structures that match it, with a length of 1-2 cm. Screw holes with a depth of 0.5-1 cm are provided on the internal spline structure for matching with the corresponding locking screw holes in the sacral pelvic ring accessory and the pubic pelvic ring accessory, thereby achieving mechanical fixation of the acetabular cup accessory. The crossbeam structure 5 and the acetabular cup body 4 are integrally formed, with the middle section of the crossbeam structure 5 fused to the bottom of the acetabular cup. The horizontal beam structure 5 is inclined at a certain angle to the acetabular cup with the center line of the acetabular cup bottom as the longitudinal axis and the horizontal tangent of the acetabular cup bottom as the transverse axis. It is divided into 9 models in 5° increments, ranging from 5° to 45°. The diameter of the acetabular cup body 4 is divided into 7 models in 2mm increments, ranging from 46mm to 60mm. There are a total of 63 combinations of acetabular cup accessories. In practical applications, a certain range of alternative acetabular cup accessories can be selected based on the preoperative design, using the acetabular cup diameter and inclination angle as parameters.

[0029] (3) Design of the pubic pelvic ring fitting: The pubic pelvic ring fitting is used to connect the acetabular cup fitting to the universal modular pubic osseointegration base. The pubic pelvic ring fitting is an arc-shaped cylinder with a certain curvature, and both the front, back, top, and bottom surfaces are circular. The surface has several pre-set through holes for suturing the patch. In terms of shape, the pubic pelvic ring fitting includes an arc-shaped cylinder with a certain curvature and interface structures on both sides. The interface structure pointing to the universal modular sacral osseointegration base and the universal modular pubic osseointegration base matches the interface design on the base and is an external spline structure. The surface has two pre-set screw holes for fixing with the base structure. Similar to the sacral pelvic ring accessory, the pubic pelvic ring accessory has three sets of curvatures: 15°, 30°, and 45°. Each set of curvatures includes several different radius values ​​for the arc-shaped cylinders. By setting different radius values, the actual span is determined. In practical use, the curvature and span of the corresponding area of ​​the healthy pelvis can be measured preoperatively to pre-select the required set, and the available accessory can be selected intraoperatively based on the actual situation. The pubic pelvic ring accessory features an external spline structure near the acetabulum for connection with the acetabular cup accessory. The spline connection structure is used to adjust the acetabular anteversion angle. The groove depth is 1–2 cm, and the center of the groove is the geometric center of the arc-shaped accessory's cross-section. A locking screw hole is provided at the bottom of the groove, allowing a locking screw to be screwed in to fix the position of the acetabular cup accessory. In application, the external spline structures in the sacral and pubic pelvic ring accessories cooperate with the internal spline structure of the acetabular cup accessory to achieve rotational adjustment of the acetabular cup around the tangent of the pelvic ring.

[0030] In this invention, both the sacral and pubic pelvic ring fittings have several soft tissue attachment points. These attachment points connect the pelvic prosthesis to the corresponding soft tissue. The soft tissue attachment points are fixation holes formed by repairing the edges of the abdominal and gluteal muscles above the prosthesis. These holes are curved cylinders with a diameter of approximately 1.5 mm, large enough to accommodate needles. The spacing between the holes is 1–1.5 cm, and the prosthesis surface around the holes is rough to facilitate better connection with the soft tissue. The number of soft tissue attachment points can be designed according to actual needs. For example, the sacral pelvic ring fitting has 6 soft tissue attachment points, and the pubic pelvic ring fitting has 7. Each attachment point is connected to the corresponding tissue via a patch. The surface of the curved cylinder in both the sacral and pubic pelvic ring fittings has several pre-set through holes for suturing the patch.

[0031] ③ Universal modular pubic osseointegration base: The universal modular pubic osseointegration base is used to connect the hemipelvic prosthesis to the contralateral pubic bone. See also... Figure 1The universal modular pubic osseointegration base has two pubic locking screw holes 7 in the area connecting to the pubic bone, used to connect to the upper and lower branches of the contralateral pubic bone respectively. Pubic screws are implanted into the contralateral pubic bone through the pubic locking screw holes 7. The pubic screws consist of upper and lower screws, implanted into the upper and lower branches of the contralateral pubic bone respectively to achieve stable mechanical fixation. This initial mechanical fixation with pubic screws simulates the human pubic symphysis, ensuring prosthesis stability. Simultaneously, the universal modular pubic osseointegration base has a spline structure on the side near the pubic pelvic ring accessory that matches the interface structure of the pubic pelvic ring accessory. The two are fixed together with locking screws. For example, the structure connecting to the pubic pelvic ring accessory is an internal spline structure with a groove 0.5-1 cm deep, 1-2 cm from the tip, for fixing with the locking screw holes on the pubic pelvic ring accessory. The cross-section of the universal modular pubic bone integration base is elliptical, with a major axis of 2-6 cm and a minor axis of 1-4 cm. The contact surface with the contralateral pubic bone is a metal trabecular structure.

[0032] In summary, the universal modular sacral osseointegration base, the modular multi-angle adjustable acetabulum and pelvic ring support components, the universal modular pubic osseointegration base, and the patient's pelvis constitute a complete and stable pelvic ring structure. This improves the stability of the pelvic prosthesis, greatly enhances the accuracy and ease of intraoperative prosthesis installation, provides excellent flexibility in prosthesis model selection, effectively addresses actual intraoperative conditions, effectively reduces the risk of complications and tumor recurrence, reduces patient pain and economic burden, and meets clinical needs. Furthermore, due to its universal design, components can be pre-produced, allowing for the selection of appropriate component models based on the patient's specific situation during clinical application. This significantly reduces preoperative design and prosthesis production cycles, shortens patient waiting time, and significantly improves patient quality of life.

[0033] The modular universal osseointegrative hemipelvic prosthesis proposed in this invention has the following beneficial effects:

[0034] (1) The hemipelvic prosthesis proposed in this invention utilizes a universal modular pubic osseointegration base to form the pubic symphysis and can form osseointegration on both sides of the sacrum and pubis, thereby forming a complete pelvic ring structure. It can effectively resist shear stress, has good stability and patient prognosis, effectively reduces the risk of complications and tumor recurrence, and greatly reduces patient pain and economic burden.

[0035] (2) The sacral and pubic bone integration base and the acetabular component in the hemipelvic prosthesis proposed in this invention are designed with a universal modular structure, which provides better flexibility for the installation of the prosthesis, facilitates the precise fixation of the components separately during the operation, improves the patient's prognosis, and reduces the design and production cycle and cost, reduces the patient's medical burden and waiting time. Moreover, the hemipelvic prosthesis uses pubic symphysis and iliac bone plate for dual biological fixation, which has good biomechanical stability and long-term stability.

[0036] (3) In the hemipelvic prosthesis proposed in this invention, all prosthesis components can be set with fixed models within a certain size range and pre-produced. In clinical application, it is only necessary to select the corresponding model according to the actual situation of the patient for matching and installation, which greatly saves the time of preoperative design and prosthesis manufacturing, improves the versatility of the prosthesis, and reduces the patient's waiting time.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A modular universal osseointegrative hemipelvic prosthesis, characterized in that, It includes a universal modular sacral osseointegration base, a modular multi-angle adjustable acetabulum and pelvic ring support assembly, and a universal modular pubic osseointegration base, and the universal modular sacral osseointegration base, the modular multi-angle adjustable acetabulum and pelvic ring support assembly, and the universal modular pubic osseointegration base all have several different models; The modular multi-angle adjustable acetabular and pelvic ring support assembly connects the sacral end to the auricular surface of the sacrum and the osteotomy area on the dorsal side of the sacrum via the universal modular sacral ossification base, and the pubic end to the opposite pubic bone via the universal modular pubic ossification base. When assembling the universal modular sacral ossification base, the modular multi-angle adjustable acetabular and pelvic ring support assembly, and the universal modular pubic ossification base, different models can be selected to adjust the overall direction and height of the pelvic ring, as well as the size, anteversion angle, and tilt angle of the acetabular cup in the modular multi-angle adjustable acetabular and pelvic ring support assembly. The universal modular sacral osseointegration base includes an auricular base, an external spline shaft (1), and a base cover. The auricular base is a fan-shaped structure composed of a sacral auricular side prosthesis (2) and a sacral dorsal side prosthesis at a preset angle. The universal modular sacral osseointegration base is divided into various models according to different gradients of the preset angle. The dorsal sacral prosthesis is rectangular in shape, and the dorsal sacral prosthesis has at least one first locking screw hole perpendicular to the dorsal sacral surface. The osteointegration screw fixes the dorsal sacral prosthesis to the osteotomy area of ​​the dorsal sacral surface through the first locking screw hole. The sacral auricular prosthesis (2) is a rounded rectangle, and the sacral auricular prosthesis (2) is provided with at least two second locking screw holes (2-1) pointing to the sacral 1 and sacral 2 bone respectively. The osteointegration screw (2-2) fixes the sacral auricular prosthesis (2) to the osteotomy area of ​​the sacral auricular surface through the second locking screw holes (2-1); The sacral auricular prosthesis (2) has an inner spline slot (2-3) at its center that mates with the outer spline shaft (1). The inner spline slot (2-3) has a screw hole (2-4) at its center for fixing the outer spline shaft (1). The outer spline shaft (1) has a screw slot (1-1) and a locking screw hole (1-2) at its center for fixing the inner and outer spline structures. The cylindrical surface of the outer spline shaft (1) that protrudes above the inner spline slot (2-3) is a smooth surface, and the cylinder facing outwards... A semi-circular groove is provided on the surface, and toothed protrusions are provided inside for connecting and locking with the sacral pelvic ring accessory in the modular multi-angle adjustable acetabulum and pelvic ring support assembly. At the same time, four screw holes are arranged horizontally on both sides of the semi-circular groove along the center point of the groove, with two holes forming a group, arranged symmetrically. A semi-cylindrical recessed structure is provided at the midpoint of the two groups of screw holes to cooperate with the fixing shaft of the sacral pelvic ring accessory and the base cover to lock and connect the sacral pelvic ring accessory with the outer side of the external spline shaft (1). The surface of the base cover is smooth and dome-shaped, with a third locking screw hole corresponding to the outer surface of the ear-shaped base. The third locking screw hole is used to cooperate with the locking screw to fix the base cover, the sacral pelvic ring accessory and the ear-shaped base together.

2. The modular universal osseointegrative hemipelvic prosthesis according to claim 1, characterized in that, The contact surfaces of the dorsal sacral prosthesis with the osteotomy area of ​​the dorsal sacral surface and the contact surfaces of the auricular sacral prosthesis with the osteotomy area of ​​the auricular surface of the sacrum are both provided with metal trabecular bone structures.

3. The modular universal osseointegrative hemipelvic prosthesis according to claim 1, characterized in that, The thickness of the dorsal sacral prosthesis ranges from 5 to 15 mm, and the width ranges from 20 to 50 mm. The thickness of the auricular sacral prosthesis (2) ranges from 10 to 20 mm, and the width ranges from 50 to 100 mm. The preset included angle ranges from 90° to 140°.

4. The modular universal osseointegrative hemipelvic prosthesis according to claim 1, characterized in that, The modular multi-angle adjustable acetabular and pelvic ring support assembly includes several different models of sacral pelvic ring accessories, acetabular cup accessories, and pubic pelvic ring accessories. By selecting different models of the sacral pelvic ring accessories and the pubic pelvic ring accessories, the height of the acetabular cup on the line connecting the midpoint of the line connecting the upper and lower edges of the auricular surface and the midpoint of the line connecting the upper and lower edges of the pubic symphysis surface can be adjusted. By selecting the model and installation direction of the acetabular cup accessories, the size, anteversion angle, and tilt angle of the acetabular cup can be adjusted. The sacral pelvic ring accessory includes an arc-shaped cylinder and interface structures on both sides. The interface structure pointing to the universal modular sacral osseointegration base is a wheel-shaped multi-tooth structure (3). The wheel-shaped multi-tooth structure (3) meshes with the semi-circular groove on the external spline shaft (1). The wheel-shaped multi-tooth structure (3) is symmetrically arranged with two cylindrical fixing shafts (3-1) on both sides at the center of the wheel-shaped multi-tooth structure (3). The cylindrical fixing shafts (3-1) are matched with the fixing points on the outer surface of the universal modular sacral osseointegration base to fix the sacral pelvic ring accessory to the universal modular sacral osseointegration base. The interface structure of the sacral pelvic ring accessory pointing to the acetabular cup accessory is a matching spline structure, and the two are fixed by locking screws. The acetabular cup accessory includes an acetabular cup body (4) and a crossbeam structure (5) located at the bottom of the acetabular cup body (4). The crossbeam structure (5) is inclined at a preset range with the acetabular cup body (4). Different inclination angles correspond to different models of the acetabular cup accessory. The middle section of the crossbeam structure (5) is a cylinder integrally formed with the acetabular cup body (4). The two ends of the cylinder are respectively provided with spline structures (6) that match the interface structures of the sacral pelvic ring accessory and the pubic pelvic ring accessory. The pubic pelvic ring accessory includes an arc-shaped cylinder and interface structures on both sides. The interface structure pointing to the acetabular cup accessory is a matching spline structure, and the two are fixed by locking screws. The interface structure pointing to the universal modular pubic osseointegration base is a matching spline structure.

5. A modular universal osseointegrative hemipelvic prosthesis according to claim 4, characterized in that, Both the sacral pelvic ring fitting and the pubic pelvic ring fitting have several soft tissue attachment points, and the surface of the arc-shaped cylinder in the sacral pelvic ring fitting and the pubic pelvic ring fitting has several pre-set through holes for suturing patches.

6. A modular universal osseointegrative hemipelvic prosthesis according to claim 4 or 5, characterized in that, The arc of the arc-shaped cylinder in the sacral pelvic ring accessory and the pubic pelvic ring accessory is set to three groups, namely 15°, 30° and 45°, and several different radius values ​​of the arc-shaped cylinder are set under each group of arc.

7. A modular universal osseointegrative hemipelvic prosthesis according to claim 4 or 5, characterized in that, The angle between the crossbeam structure (5) and the acetabular cup body (4) in the acetabular cup accessory is divided into 9 models in 5° increments from 5° to 45°. The acetabular cup diameter of the acetabular cup body (4) is divided into 7 models in 2mm increments from 46 to 60mm. The acetabular cup accessory has a total of 63 model combinations.

8. A modular universal osseointegrative hemipelvic prosthesis according to claim 4, characterized in that, The universal modular pubic osseointegration base is provided with two pubic locking screw holes (7), which are used to connect the upper and lower branches of the opposite pubic bone, respectively. The universal modular pubic osseointegration base is provided with a spline structure that matches the interface structure of the pubic pelvic ring accessory on the side near the pubic bone. The two are fixed by locking screws. The side of the universal modular pubic osseointegration base near the opposite pubic bone is a metal trabecular bone structure.

9. A modular universal osseointegrative hemipelvic prosthesis according to claim 8, characterized in that, The universal modular pubic bone integration base is elliptical in shape, with a major axis length of 2-6 cm and a minor axis length of 1-4 cm.

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