Modular three-dimensional adjustable bone-integrating hemipelvic prosthesis

Abstract

The application relates to a three-dimensional adjustable bone-integrated half-pelvis prosthesis, which comprises a split assembled customized sacrum bone-integrated base, an acetabular cup assembly, a customized pubic bone-integrated base, a sacrum side pelvis ring support assembly and a pubic side pelvis ring support assembly; one end of the customized sacrum bone-integrated base is connected with the sacrum, and the other end is connected with the acetabular cup assembly through the sacrum side pelvis ring support assembly; one end of the customized pubic bone-integrated base is connected with the healthy pubic bone, and the other end is connected with the acetabular cup assembly through the pubic side pelvis ring support assembly; when the acetabular cup assembly, the sacrum side pelvis ring support assembly and the pubic side pelvis ring support assembly are assembled, the anteversion angle of the acetabular cup assembly can be adjusted relative to the sacrum side pelvis ring support assembly and the pubic side pelvis ring support assembly. The half-pelvis prosthesis and the pelvis of the patient constitute a complete and stable pelvis ring structure, the stability of the half-pelvis prosthesis is improved, and the accuracy and convenience of the prosthesis installation during the operation are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of artificial half-pelvis prosthesis, in particular to a three-dimensional adjustable bone-integrated half-pelvis prosthesis. BACKGROUND

[0002] The pelvis is a common site of bone tumors. Due to the complex anatomical structure of the pelvis, reconstructing the function of the half-pelvis after tumor resection is a great challenge for orthopedic oncologists. At present, the classification of tumor resection and reconstruction of the pelvis is mainly Enneking classification, which is divided into four types according to anatomy: type I: iliac bone resection; type II: periacetabular resection; type III: ischium and pubis resection; type IV: resection involving the sacrum. For Enneking I+II+III area pelvic malignant tumors, due to the large range of resection, the difficulty in determining the fixation method and the position of acetabular reconstruction, and a series of other problems, the task of reconstructing the half-pelvis prosthesis is particularly difficult.

[0003] At present, the main methods for pelvic reconstruction are artificial prosthesis reconstruction, joint fusion, allogeneic bone reconstruction, autologous tumor bone inactivation and replantation, etc. Among them, joint fusion, allogeneic bone reconstruction, autologous tumor bone inactivation and replantation, etc. have been eliminated due to high infection rate, bone source limitation, high risk of tumor recurrence, etc. At present, artificial half-pelvis prosthesis reconstruction gradually occupies the dominant position in the treatment of pelvic malignant tumors due to its good initial stability, easy-to-accept appearance, and relatively fast functional recovery. So far, the commonly used prosthesis in clinical practice is mainly a full-custom prosthesis, i.e. the prosthesis is designed and customized based on the anatomical structure of the patient's healthy side pelvis. Although this mode has the advantages of high precision and good matching, it still has some defects.

[0004] Firstly, in actual clinical application, the integrated custom prosthesis often has installation difficulties in the complex structure and narrow space of the pelvic region, requiring a large amount of soft tissue separation, causing significant collateral tissue damage and affecting patient recovery after surgery. In addition, the space limitation of the surgical area may also result in the inability to accurately install a large prosthesis structure in the preset area, affecting the fixation effect and leading to poor follow-up results.

[0005] Secondly, the full-custom prosthesis design is complex. In order to achieve individualized customization of the prosthesis, a large amount of clinical data needs to be collected, the design cost is high, the time-consuming is long, and the patient's expenses are high.

[0006] Thirdly, the full-custom prosthesis needs to be customized and produced, which requires separate production of the prosthesis for each patient, resulting in high cost, long working hours, and long waiting time for patients.

[0007] Finally, the full customized prosthesis needs to accurately process the data before the operation to ensure the high matching of the prosthesis and the pelvic anatomy of the patient, and in the relatively long production cycle, once the patient's condition progresses, the pelvic structure is further damaged or pathological fracture occurs, the already produced prosthesis cannot be used, which may cause further extension of the production cycle. At the same time, the preoperative data collection is based on imaging data, which is difficult to accurately match with the actual intraoperative situation, and in actual application, the full customized prosthesis often has space for adjustment in details. SUMMARY

[0008] In view of the deficiencies of the existing full customized half-pelvis prosthesis, in order to reduce the design and manufacturing difficulty of the prosthesis, shorten the design and manufacturing time, and improve the adaptability of the half-pelvis prosthesis, the application provides a new type of three-dimensional adjustable bone integrated half-pelvis prosthesis with semi-customization characteristics, which can adjust various parameters of the half-pelvis prosthesis through assembly.

[0009] To achieve the above object, the application adopts the following technical scheme:

[0010] An assembly type three-dimensional adjustable bone integrated half-pelvis prosthesis comprises a split assembly type customized sacrum bone integrated base, an acetabular cup assembly, a customized pubic bone integrated base, a sacrum side pelvic ring support assembly and a pubic side pelvic ring support assembly, and the acetabular cup assembly has several models with different acetabular cup diameters and different inclination angles.

[0011] The end of the customized sacrum bone integrated base close to the sacrum is connected with the sacrum through sacrum transverse locking micro-hole screws and sacrum dorsal screws, and the end of the customized sacrum bone integrated base away from the sacrum is connected with the acetabular cup assembly through the sacrum side pelvic ring support assembly.

[0012] The end of the customized pubic bone integrated base close to the healthy side pubic bone is connected with the healthy side pubic bone through pubic screws, and the end of the customized pubic bone integrated base away from the healthy side pubic bone is connected with the acetabular cup assembly through the pubic side pelvic ring support assembly.

[0013] When the acetabular cup assembly, the sacrum side pelvic ring support assembly and the pubic side pelvic ring support assembly are assembled, the anteversion angle of the acetabular cup assembly can be adjusted relative to the sacrum side pelvic ring support assembly and the pubic side pelvic ring support assembly.

[0014] Compared with the prior art, the application has the following beneficial effects:

[0015] (1) The customized sacrum bone integration base, the acetabular cup assembly, the customized pubic bone integration base, the sacrum side pelvic ring support assembly and the pubic side pelvic ring support assembly in the semi-pelvic prosthesis are designed in a split assembly structure, which provides better flexibility for the installation of the prosthesis, facilitates the accurate installation and fixation of the components during the operation, and thus better fixation effect is obtained, the postoperative life quality of the patient is improved, and the service life of the prosthesis is prolonged;

[0016] (2) The customized sacrum bone integration base and the customized pubic bone integration base in the application are designed individually by collecting clinical imaging data of the patient, and the maximum initial fixation and long-term bone integration effect are obtained through the bone integration design, while the acetabular cup assembly, the sacrum side pelvic ring support assembly and the pubic side pelvic ring support assembly use pre-produced finished parts, and the parts are matched with each other through a universal interface to obtain good matching degree and fixation effect, so that the semi-pelvic prosthesis has the advantages of individualization and generalization, the appropriate model is selected within a certain range according to the preoperative design, and the actual situation is adjusted during the operation, thereby reducing the total design and production cycle and cost of the prosthesis, reducing the medical burden and waiting time of the patient;

[0017] (3) The semi-pelvic prosthesis simultaneously applies biological fixation of the pubic symphysis and the iliac plate, forms bone integration on both sides of the sacrum and pubis, and forms a complete pelvic ring structure, so that the biomechanical stability and long-term stability are good, and the risk of complications and tumor recurrence is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The structure diagram of the split assembly three-dimensional adjustable bone integration semi-pelvic prosthesis is shown in the application;

[0019] Figure 2 The structure diagram of the customized sacrum bone integration base in the application is shown in the application, Figure 2 The sacrum transverse screw hole and the sacrum dorsal screw hole are shown in a perspective manner;

[0020] Figure 3 Another structure diagram of the customized sacrum bone integration base in the application is shown in the application, Figure 3 The sacrum dorsal screw hole is shown in a perspective manner;

[0021] Figure 4 The structure diagram of the customized pubic bone integration base in the application is shown in the application, Figure 4 The sacrum dorsal screw hole and the pubic screw hole are shown in a perspective manner;

[0022] Figure 5 Another structure diagram of the customized pubic bone integration base in the application is shown in the application;

[0023] Figure 6is a structural schematic diagram of the sacral side pelvic ring support assembly or the pubic side pelvic ring support assembly in the application;

[0024] Figure 7 is Figure 6 is a top view of the assembly shown in the figure;

[0025] Figure 8 is a structural schematic diagram of the acetabular cup assembly in the application;

[0026] Figure 9 is another structural schematic diagram of the acetabular cup assembly in the application;

[0027] Figure 10 is a cross-sectional schematic diagram of the gear type connecting joint in the application;

[0028] Explanation of reference signs:

[0029] 100, customized sacral bone integration base; 110, sacral transverse screw hole; 120, sacral dorsal screw hole; 130, first rectangular plug-in interface; 140, first locking screw hole; 200, acetabular cup assembly; 210, acetabular cup body; 220, beam structure; 221, cylinder; 222, gear type connecting joint; 223, slotted; 300, customized pubic bone integration base; 310, pubic screw hole; 320, second rectangular plug-in interface; 330, second locking screw hole; 400, sacral side pelvic ring support assembly; 500, pubic side pelvic ring support assembly; i, arc-shaped cylinder; ii, pre-set through hole position; iii, plug; iv, third locking screw hole; v, gear type hole groove; vi, acetabular locking screw hole; I, first prosthetic surface; II, second prosthetic surface. DETAILED DESCRIPTION

[0030] The technical solutions of the application will be described in detail below in combination with the drawings and preferred embodiments.

[0031] The application proposes a three-dimensional adjustable assembly type bone integration half-pelvis prosthesis, which is a prosthesis implanted into a patient's body on the basis of removing part of the sacrum, all iliac bones and pubic bones of the patient's affected side, Figure 1 is a structural schematic diagram of the assembly type three-dimensional adjustable bone integration half-pelvis prosthesis in the application. As shown in the figure, Figure 1As shown, the assembled three-dimensional adjustable bone integration half-pelvis prosthesis includes a customized sacrum bone integration base 100, an acetabular cup assembly 200, a customized pubic bone integration base 300, a sacrum side pelvic ring support assembly 400 and a pubic side pelvic ring support assembly 500, and the customized sacrum bone integration base 100, the acetabular cup assembly 200, the customized pubic bone integration base 300, the sacrum side pelvic ring support assembly 400 and the pubic side pelvic ring support assembly 500 adopt a split assembly design, wherein one end of the customized sacrum bone integration base 100 close to the sacrum is connected with the sacrum through sacrum transverse locking micro-hole screws and sacrum dorsal screws, and the other end of the customized sacrum bone integration base 100 away from the sacrum is connected with the acetabular cup assembly 200 through the sacrum side pelvic ring support assembly 400; one end of the customized pubic bone integration base 300 close to the healthy side pubic bone is connected with the healthy side pubic bone through pubic screws, and the other end of the customized pubic bone integration base 300 away from the healthy side pubic bone is connected with the acetabular cup assembly 200 through the pubic side pelvic ring support assembly 500. This split assembly design can provide better flexibility for the installation of the prosthesis, facilitate the accurate fixation of the components during the operation, and improve the prognosis of the patient. At the same time, it reduces the total design and production cycle and cost of the prosthesis, and reduces the medical burden and waiting time of the patient.

[0032] The acetabular cup assembly 200 in the present application is used to connect with the femoral side prosthesis. The acetabular cup assembly 200 has several models with different cup diameters and different inclination angles, and the anteversion angle of the acetabular cup assembly 200 can be adjusted relative to the sacrum side pelvic ring support assembly 400 and the pubic side pelvic ring support assembly 500 when the acetabular cup assembly 200, the sacrum side pelvic ring support assembly 400 and the pubic side pelvic ring support assembly 500 are assembled, so that the cup size, inclination angle and anteversion angle of the acetabular cup assembly 200 can be flexibly selected and adjusted according to the actual situation during the operation, thereby improving the prognosis of the patient, improving the quality of life of the patient after the operation, and prolonging the service life of the prosthesis.

[0033] As Figure 2 and Figure 3As shown, the customized sacral bone integration base 100 in the application is used to connect the sacral side pelvic ring support assembly 400 and the sacral auricular surface, specifically, the customized sacral bone integration base 100 is close to one end of the sacrum, and the sacral transverse screw hole 110 and the sacral dorsal screw hole 120 are respectively arranged on the sacral auricular surface section and the sacral dorsal surface, the sacral transverse screw hole 110 and the sacral dorsal screw hole 120 penetrate the customized sacral bone integration base 100, wherein the sacral transverse screw hole 110 is threadedly matched with the sacral transverse locking micro-hole screw, and the sacral dorsal screw hole 120 is threadedly matched with the sacral dorsal screw, the sacral transverse locking micro-hole screw is implanted transversely on the first sacral vertebra and the second sacral vertebra through the sacral transverse screw hole 110, and the sacral dorsal screw is implanted dorsally to ventrally on the sacrum above the sacral ala, at the level of the first sacral foramen and the second sacral foramen. The sacral transverse locking micro-hole screw and the sacral dorsal screw are implanted in each other, that is, the positions of the sacral transverse locking micro-hole screw and the sacral dorsal screw on the sacrum are staggered with each other, but the sacral transverse screw hole 110 and the sacral dorsal screw hole 120 are not connected, so as to achieve early stability of the sacral screw, effectively avoid the neural structure of the sacral canal and the sacral foramen according to the preoperative design of the locking screw, ensure the safety of the operation, and the surface of the sacral transverse locking micro-hole screw is provided with micro-holes for bone integration with the sacrum, which can form a good biological fixation with the sacral vertebra, and finally realize long-term fixation of the screw. The application of the sacral dorsal screw can reduce the stress load of the sacral transverse locking micro-hole screw, reduce the risk of breaking of the prosthesis screw, and ensure the stability of the prosthesis.

[0034] At the same time, the end of the customized sacral bone integration base 100 away from the sacrum is provided with a first rectangular insertion interface 130 and a first locking screw hole 140, and the direction of the first rectangular insertion interface 130 is set as the line connecting the midpoint of the upper and lower edges of the sacral auricular surface and the midpoint of the upper and lower edges of the pubic symphysis surface, and the line passes through the geometric center of the rectangular cross section of the first rectangular insertion interface 130; the first locking screw hole 140 penetrates the structure to the opposite side, that is, penetrates the first rectangular insertion interface 130 and the customized sacral bone integration base 100. The length of the first rectangular insertion interface 130 is 3 cm, the width is 1 cm, and the depth is 2 cm. The number of the first locking screw hole 140 is set to 2.

[0035] As Figure 4 and Figure 5As shown, the customized pubic bone integration base 300 in the application is used to connect the contralateral pubic side pelvic ring support assembly 500 and the ipsilateral pubic bone, specifically, the customized pubic bone integration base 300 is close to one end of the ipsilateral pubic bone, and a pubic screw hole 310 threaded with a pubic screw is arranged on the pubic symphysis surface, the pubic screw hole 310 penetrates through the customized pubic bone integration base 300, and the pubic screw is implanted into the ipsilateral pubic bone through the pubic screw hole 310. The pubic screw is divided into upper and lower two screws, which are implanted into the upper and lower branches of the ipsilateral pubic bone to obtain stable mechanical fixation. Through the early mechanical fixation of the pubic screw, the pubic symphysis of the human body is simulated, and the stability of the prosthesis is ensured.

[0036] Meanwhile, the end of the customized pubic bone integration base 300 away from the ipsilateral pubic bone is provided with a second rectangular insertion interface 320 and a second locking screw hole 330, and the direction of the second rectangular insertion interface 320 is set as the line connecting the midpoint of the upper and lower edges of the sacral ear-like surface and the midpoint of the upper and lower edges of the pubic symphysis surface, and the line passes through the geometric center of the rectangular cross section of the second rectangular insertion interface 320; the second locking screw hole 330 penetrates through the structure to the opposite side, that is, penetrates through the second rectangular insertion interface 320 and the customized pubic bone integration base 300. Among them, the length of the second rectangular insertion interface 320 is 3cm, the width is 1cm, and the depth is 2cm. The number of second locking screw holes 330 is also set to 2.

[0037] The customized sacral bone integration base 100 and the customized pubic bone integration base 300 in the application are obtained by collecting clinical imaging data of patients for individual design, and the first prosthesis surface I at the joint of the customized sacral bone integration base 100 and the sacral bone and the second prosthesis surface II at the joint of the customized pubic bone integration base 300 and the ipsilateral pubic bone are both microporous surfaces, which can enhance the bone integration at the bone-prosthesis connection to achieve the purpose of long-term bone integration of the prosthesis and the sacral bone and the pubic bone, and realize the long-term stability of the prosthesis. Optionally, the microporous surface has a micropore diameter of 70nm and a material of hydroxyapatite coating.

[0038] The customized sacral bone integration base 100 and the customized pubic bone integration base 300 are also designed with soft tissue attachment points to connect the muscles and soft tissues around the pelvis and provide a stable muscle environment for the prosthesis. The soft tissue attachment points in the application have a curved cylindrical shape, a diameter of about 1.5mm, and a hole spacing of 1-1.5cm, and the prosthesis around the hole has a rough surface to better connect with the soft tissue. The number of soft tissue attachment points on the customized sacral bone integration base 100 and the customized pubic bone integration base 300 can be designed according to actual needs, for example, the customized sacral bone integration base 100 is provided with 6 soft tissue attachment points, and the customized pubic bone integration base 300 is provided with 7 soft tissue attachment points, and each soft tissue attachment point is connected to the corresponding tissue through a patch.

[0039] Further, the ratio of the number of pubic screws, sacral transverse locking micro-hole screws and sacral dorsal screws is 2:2:3.

[0040] Preferably, the pubic screw, the sacral transverse locking micro-hole screw and the sacral dorsal screw are all taken as pedicle screws.

[0041] The sacral side pelvic ring support assembly 400 and the pubic side pelvic ring support assembly 500 in the application have the same structure, both including an arc-shaped cylinder i, the surface of the arc-shaped cylinder i is provided with a plurality of preset through holes ii for suturing a patch, one end of the arc-shaped cylinder i is provided with a plug iii for plug-in cooperation with the first rectangular insertion port 130 or the second rectangular insertion port 320, and the plug iii is provided with a third locking screw hole iv, the other end of the arc-shaped cylinder i is provided with a gear type hole groove v for connecting the acetabular cup assembly 200, the center of the gear type hole groove v is located on the central axis of the arc-shaped cylinder i, and the gear type hole groove v is provided with an acetabular locking screw hole vi for thread cooperation with an acetabular locking screw.

[0042] Specifically, as shown in Figure 6 and Figure 7 , the sacral side pelvic ring support assembly 400 and the pubic side pelvic ring support assembly 500 include a cylindrical structure with a certain arc, i.e. the arc-shaped cylinder i, and the interface structures on both sides, i.e. the plug iii and the gear type hole groove v, wherein the interface structure, i.e. the plug iii, pointing to the customized sacral bone integration base 100 and the customized pubic bone integration base 300, matches the interface design on the base, which is a male head in the plug-in structure, and its surface is provided with two third locking screw holes iv for fixing with the base structure. The arc of the arc-shaped cylinder i is divided into three groups and different lengths, and the arc is set to 15°, 30° and 45°, and each group is set to its actual span by setting different radii. In actual use, the corresponding area arc and span of the healthy side of the pelvis can be measured before the operation, and a group that needs to be used can be selected in advance, and the available accessories can be selected according to the actual situation during the operation. The design of the sacral side pelvic ring support assembly 400 and the pubic side pelvic ring support assembly 500 at the near-pelvis is a gear type hole groove structure, which is used for connection with the acetabular cup assembly 200. The gear type hole groove v is used to adjust the anteversion angle of the acetabular cup assembly 200, and the depth of the hole groove is 1-2 cm. The center of the hole groove is located on the central axis of the arc-shaped cylinder i, and at the bottom near the hole groove, an acetabular locking screw hole vi is arranged, which can be screwed into an acetabular locking screw to fix the position of the acetabular cup assembly 200. In actual application, the gear type hole groove v is plug-in cooperated with the gear type connection joint 222 of the acetabular cup assembly 200, so as to realize the rotation adjustment of the acetabular cup with the pelvic ring incision as the rotation axis.

[0043] As shown in Figure 8 to Figure 10As shown, the acetabular cup assembly 200 in the application includes an acetabular cup body 210 and a beam structure 220 at the bottom of the acetabular cup body 210, the beam structure 220 has a preset range of inclination angle with the acetabular cup body 210, different inclination angles correspond to different models of the acetabular cup assembly 200, the middle segment of the beam structure 220 is a cylinder 221 integrally formed with the acetabular cup body 210, the diameter of the cylinder 221 ranges from 2 to 4 cm, the length is 80% of the diameter of the acetabular cup body 210, both ends of the cylinder 221 are respectively provided with a gear type connecting joint 222 matched with the gear type hole slot v, the cross-sectional shape of the gear type connecting joint 222 is a gear type matched with the shape of the gear type hole slot v, the length ranges from 1 to 2 cm, and a fixed slot 223 is arranged at the position opposite to the acetabular locking screw hole vi of the gear type connecting joint 222, the depth ranges from 0.5 to 1 cm, and the slot 223 is used for matching between the acetabular locking screw hole vi to realize the mechanical fixation of the acetabular cup assembly 200.

[0044] The beam structure 220 is integrally formed with the acetabular cup body 210, wherein the middle segment of the beam structure 220 is fused with the bottom of the acetabular cup body 210. The beam structure 220 has a certain range of inclination angle with the acetabular cup in the horizontal direction, taking the center line of the bottom of the acetabular cup as the longitudinal axis and the horizontal tangent line of the bottom of the acetabular cup as the transverse axis, the inclination angle is divided into 5°-45° in 5° units, a total of 9 models, the diameter of the acetabular cup is divided into 46mm-60mm in 2mm units, a total of 7 models, so the acetabular cup assembly has a total of 63 model combinations, in actual application, according to the preoperative design, the diameter of the acetabular cup and the inclination angle are taken as parameters to select a certain range of alternative acetabular cup assemblies 200.

[0045] By selecting different models of the sacral pelvic ring support assembly 400 and the pubic pelvic ring support assembly 500, the height adjustment of the acetabular cup 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 is realized, by selecting the model and installation direction of the acetabular cup assembly 200, the size and anteversion angle and inclination angle of the acetabular cup are adjusted, and then the adjustable three-dimensional semi-pelvic prosthesis is realized.

[0046] Further, the length of the sacral pelvic ring support assembly 400 and the pubic pelvic ring support assembly 500 and the model of the acetabular cup assembly 200 are determined by the following steps:

[0047] Step one: according to the healthy side acetabulum, the position of the affected side acetabulum is determined by mirror symmetry;

[0048] Step two: measure the midpoint a of the line connecting the upper and lower edges of the sacral auricular surface, the rotation center b of the acetabulum and the midpoint c of the line connecting the upper and lower edges of the pubic symphysis surface in the CT three-dimensional reconstruction information of the healthy side acetabulum, and determine the length of the sacral pelvic ring support assembly 400 and the pubic pelvic ring support assembly 500 according to the length of ab and bc respectively.

[0049] Step three: measure the acetabular cup diameter and inclination angle of the healthy side, and determine the model of the acetabular cup assembly 200 according to the acetabular cup diameter and inclination angle.

[0050] In summary, the customized sacral bone integration base 100, the acetabular cup assembly 200, the customized pubic bone integration base 300, the sacral side pelvic ring support assembly 400 and the pubic side pelvic ring support assembly 500 form a complete and stable pelvic ring structure with the pelvis of the patient, improve the stability of the hemipelvic prosthesis, greatly improve the accuracy and simplicity of the prosthesis installation during the operation, provide good flexibility for the selection of the model of the prosthesis, can effectively correspond to the actual situation during the operation, effectively reduce the risk of complications and tumor recurrence, reduce the pain and economic burden of the patient, and can meet the needs in the clinic.

[0051] The assembled three-dimensional adjustable bone integration hemipelvic prosthesis has the following beneficial effects:

[0052] (1) The hemipelvic prosthesis provided by the application has a split assembly structure design between the customized sacral bone integration base, the acetabular cup assembly, the customized pubic bone integration base, the sacral side pelvic ring support assembly and the pubic side pelvic ring support assembly, which provides better flexibility for the installation of the prosthesis, facilitates the accurate installation and fixation of the components during the operation, thereby obtaining better fixation effect, improving the life quality of the patient after the operation, and prolonging the service life of the prosthesis.

[0053] (2) The customized sacral bone integration base and the customized pubic bone integration base in the application are individually designed by collecting clinical imaging data of the patient, and the maximum initial fixation and long-term bone integration effect are obtained through the bone integration design, while the acetabular cup assembly, the sacral side pelvic ring support assembly and the pubic side pelvic ring support assembly use pre-produced finished parts, and the parts adopt a universal interface to obtain good matching degree and fixation effect between the parts, so that the hemipelvic prosthesis has the advantages of individualization and generalization design, the appropriate model is selected within a certain range according to the preoperative design, and the actual situation is adjusted during the operation, at the same time, the total design and production cycle and cost of the prosthesis are reduced, the medical burden and waiting time of the patient are reduced.

[0054] (3) The hemipelvic prosthesis provided by the application simultaneously applies the pubic symphysis and iliac plate double biological fixation, forms bone integration on both sides of the sacrum and pubis, and forms a complete pelvic ring structure, which has good biomechanical stability and long-term stability, and can effectively reduce the risk of complications and tumor recurrence.

[0055] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0056] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A modular three-dimensional adjustable bone- integrating hemi-pelvic prosthesis, comprising: The application relates to a customized sacrum bone integration base (100), an acetabular cup assembly (200), a customized pubic bone integration base (300), a sacrum side pelvic ring support assembly (400) and a pubic side pelvic ring support assembly (500) which are assembled separately, and the acetabular cup assembly (200) has several models with different acetabular cup diameters and different inclination angles. The customized sacrum bone integration base (100) is connected with the sacrum through sacrum transverse locking micro-hole screws and sacrum dorsal screws at one end close to the sacrum, and is connected with the acetabular cup assembly (200) through the sacrum side pelvic ring support assembly (400) at the other end away from the sacrum; the one end close to the sacrum of the customized sacrum bone integration base (100) is provided with sacrum transverse screw holes (110) threadedly matched with the sacrum transverse locking micro-hole screws and sacrum dorsal screw holes (120) threadedly matched with the sacrum dorsal screws, the sacrum transverse locking micro-hole screws are implanted in the sacrum transversely at first and second sacral vertebrae through the sacrum transverse screw holes (110), and the surface of the sacrum transverse locking micro-hole screws is provided with micro-holes for bone integration with the sacrum; the sacrum dorsal screws are implanted in the sacrum from the dorsal side to the ventral side above the alae of the sacrum, at the level of the first and second sacral foramina through the sacrum dorsal screw holes (120); the other end away from the sacrum of the customized sacrum bone integration base (100) is provided with a first rectangular insertion interface (130) and a first locking screw hole (140), and the geometric center of the cross section of the first rectangular insertion interface (130) is located on the line connecting the midpoint of the upper and lower edges of the sacral auricular surface and the midpoint of the upper and lower edges of the pubic synchondrosal surface, and the first locking screw hole (140) penetrates the first rectangular insertion interface (130) and the customized sacrum bone integration base (100); The customized pubic bone integration base (300) is connected with the contralateral pubic bone through a pubic screw at one end close to the contralateral pubic bone, and is connected with the acetabular cup assembly (200) through the pubic side pelvic ring support assembly (500) at the other end away from the contralateral pubic bone; the one end close to the contralateral pubic bone of the customized pubic bone integration base (300) is provided with a pubic screw hole (310) threadedly matched with the pubic screw, and the pubic screw is implanted in the contralateral pubic bone through the pubic screw hole (310); the other end away from the contralateral pubic bone of the customized pubic bone integration base (300) is provided with a second rectangular insertion interface (320) and a second locking screw hole (330), and the geometric center of the cross section of the second rectangular insertion interface (320) is located on the line connecting the midpoint of the upper and lower edges of the sacral auricular surface and the midpoint of the upper and lower edges of the pubic synchondrosal surface, and the second locking screw hole (330) penetrates the second rectangular insertion interface (320) and the customized pubic bone integration base (300). The anteversion angle of the acetabular cup assembly (200) is adjustable relative to the sacral side pelvic ring support assembly (400) and the pubic side pelvic ring support assembly (500) when the acetabular cup assembly (200), the sacral side pelvic ring support assembly (400) and the pubic side pelvic ring support assembly (500) are assembled; The sacral side pelvic ring support assembly (400) and the pubic side pelvic ring support assembly (500) are the same structure, both including an arc-shaped cylinder (i), the surface of the arc-shaped cylinder (i) is provided with a plurality of preset through holes (ii) for suturing a patch, one end of the arc-shaped cylinder (i) is provided with a plug (iii) for plug-in cooperation with the first rectangular plug-in interface (130) or the second rectangular plug-in interface (320), and the plug (iii) is provided with a third locking screw hole (iv), the other end of the arc-shaped cylinder (i) is provided with a gear type hole groove (v) for connecting the acetabular cup assembly (200), the center of the gear type hole groove (v) is located on the central axis of the arc-shaped cylinder (i), and the gear type hole groove (v) is provided with an acetabular locking screw hole (vi) for thread cooperation with an acetabular locking screw; The acetabular cup assembly (200) includes an acetabular cup body (210) and a beam structure (220) at the bottom of the acetabular cup body (210), the beam structure (220) has a preset range of inclination angle with the acetabular cup body (210), and different inclination angles correspond to different models of the acetabular cup assembly (200), the middle segment of the beam structure (220) is a cylinder (221) integrally formed with the acetabular cup body (210), both ends of the cylinder (221) are respectively provided with a gear type connecting joint (222) for plug-in cooperation with the gear type hole groove (v), and the gear type connecting joint (222) is provided with a slot (223) for fixing at a position opposite to the acetabular locking screw hole (vi).

2. A modular three-dimensional adjustable bone integrating hemi-pelvic prosthesis according to claim 1, wherein, The length of the first rectangular plug-in interface (130) and the second rectangular plug-in interface (320) is 3cm, the width is 1cm, and the depth is 2cm.

3. A modular three-dimensional adjustable bone integrating semi-pelvic prosthesis according to claim 1, wherein, The diameter of the cylinder (221) ranges from 2cm to 4cm, the length is 80% of the diameter of the acetabular cup body (210), the length of the gear type connecting joint (222) ranges from 1cm to 2cm, and the depth of the slot (223) ranges from 0.5cm to 1cm.

4. The modular three-dimensional adjustable bone integrating hemi-pelvic prosthesis of claim 1, wherein, The length of the sacral side pelvic ring support assembly (400) and the pubic side pelvic ring support assembly (500) and the model of the acetabular cup assembly (200) are determined by the following steps: Step one: according to the contralateral acetabulum, the ipsilateral acetabulum position is determined by mirror image symmetry; Step two: measure the midpoint a of the upper and lower edges of the auricular surface of the sacrum, the center of rotation of the acetabulum b, and the midpoint c of the upper and lower edges of the pubic symphysis surface in the CT three-dimensional reconstruction information of the healthy side acetabulum, and determine the length of the sacral side pelvic ring support assembly (400) and the pubic side pelvic ring support assembly (500) according to the lengths of ab and bc respectively; Step three: measure the acetabular cup diameter and inclination angle of the healthy side acetabulum, and determine the model of the acetabular cup assembly (200) according to the acetabular cup diameter and the inclination angle.

5. The modular three-dimensional adjustable bone integrating hemi-pelvic prosthesis of claim 1, wherein, The ratio of the number of the pubic bone screws, the sacral transverse locking micro-hole screws and the sacral dorsal screws is 2:2:3, and the sacral transverse locking micro-hole screws and the sacral dorsal screws are interpenetrated, the pubic bone screws include upper and lower screws which are implanted into the upper and lower branches of the healthy side pubic bone respectively.

6. The modular three-dimensional adjustable bone integrating hemi-pelvic prosthesis of claim 1, wherein, The custom sacral bone integration base (100) and the custom pubic bone integration base (300) are both provided with a plurality of soft tissue attachment points, and each soft tissue attachment point is connected to the corresponding tissue through a patch.

7. The modular three-dimensional adjustable bone integrating hemi-pelvic prosthesis of claim 1, wherein, The first prosthetic surface (I) of the custom sacral bone integration base (100) and the second prosthetic surface (II) of the custom pubic bone integration base (300) are both micro-hole surfaces, the micro-hole diameter of the micro-hole surface is 70nm, and the material is hydroxyapatite coating.

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