Pelvic defect implantation prosthesis through pubic ramus and pelvic defect supporting structure

Abstract

The invention provides a transpubis ramus pelvic bone defect implantation prosthesis and a pelvic defect supporting structure. The implantation prosthesis comprises a first supporting keel and a first hollow framework wrapping the first supporting keel. The first supporting keel comprises a first pipe sleeve and a second pipe sleeve connected with the first pipe sleeve in sequence, the inner diameter of the first pipe sleeve is larger than that of the second pipe sleeve, and inner cavities of the two communicated pipe sleeves form a containing cavity used for being fixed to a screw of a pugmatis marrow cavity. The first hollowed-out framework comprises a hollowed-out rod-shaped body, and the hollowed-out rod-shaped body is provided with a first end and a second end which are oppositely arranged. The first end is used for being connected with an acetabular bone defect implantation prosthesis, and the side edge of the first end further extends to form a lap joint part which is used for being in lap joint with the acetabular bone defect implantation prosthesis through bone cement; the second end is used for being connected with the pubic ramus; the hollow rod-shaped body is gradually enlarged from the second end to the first end along the length direction of the hollow rod-shaped body, and the end surface of the second end is an arc-shaped surface protruding outwards; the stability of acetabular bone defect reconstruction can be improved, and the risk of loosening of the implanted prosthesis is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a pelvic bone defect implantation prosthesis through the pubic branch and a pelvic defect support structure. Background Art

[0002] In the treatment of acetabular bone defects, stability and reconstruction are the key to achieving long-term success. Current treatment methods mainly include acetabular bone grafting and prosthetic reconstruction. However, due to the complex anatomical structure of the acetabular region and the problems of bone loss or bone defects, existing prosthetic implants are often difficult to achieve sufficient stability, especially in cases of severe bone defects. Traditional acetabular reconstruction methods mainly rely on autologous bone or allogeneic bone grafting. These methods have problems such as poor bone integration, bone absorption, and insufficient transplanted bone, which increase the risk of prosthesis loosening or failure; in addition, the existing metal fixation structure in acetabular reconstruction lacks effective connection with the pubic ramus, resulting in insufficient overall structural stability.

[0003] Therefore, there is an urgent need for a pelvic bone defect implant prosthesis and a pelvic defect support structure through the pubic ramus, which can greatly improve the stability of acetabular bone defect reconstruction and significantly reduce the risk of implant prosthesis loosening. Summary of the invention

[0004] The purpose of the present invention is to provide a pelvic bone defect implant prosthesis through the pubic branch and a pelvic defect support structure, aiming to solve the technical problems of poor reconstruction stability and easy loosening of the prosthesis of the traditional acetabular bone defect implant prosthesis.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a prosthesis for implanting a pelvic bone defect through the pubic ramus, comprising:

[0006] A first supporting keel, the first supporting keel comprising a first sleeve and a second sleeve connected to the first sleeve, wherein the inner diameter of the first sleeve is larger than that of the second sleeve, and the inner cavities of the two sleeves connected to each other constitute a receiving cavity for a screw fixed in the pubic medullary cavity;

[0007] A first hollow frame wrapped around the first supporting keel, wherein the first hollow frame comprises a hollow rod-shaped body, and the hollow rod-shaped body has a first end and a second end that are oppositely disposed;

[0008] The first end is used to connect with the acetabular bone defect implant prosthesis, and the side of the first end also extends to form a lap joint portion, which is used to overlap the acetabular bone defect implant prosthesis through bone cement; the second end is used to connect with the pubic branch;

[0009] The hollow rod-shaped body gradually increases in size from the second end to the first end along its length direction, and the end face of the second end is an arc-shaped face convex outward; the first supporting keel and the first hollow skeleton are both made of bone biocompatible material.

[0010] As a further improvement of the above solution, the first supporting keel is obliquely arranged in the hollow rod-shaped body, and the first sleeve end thereof faces the first end of the first hollow skeleton;

[0011] The end of the second tube sleeve away from the first tube sleeve has an end surface adapted to the outer shape of the hollow rod-shaped body.

[0012] As a further improvement of the above scheme, the central axis JJ of the hollow rod-shaped body forms a first preset angle a with the central axis II of the first supporting keel; preferably, the range of the first preset angle is 7°≤a≤13°.

[0013] As a further improvement of the above scheme, the central axis KK of the overlapping portion and the central axis JJ of the hollow rod-shaped body form a second preset angle b; preferably, the range of the second preset angle is 35°≤b≤41°.

[0014] As a further improvement of the above solution, the overlapping portion gradually shrinks along its length direction from the connection with the hollow rod-shaped body to the end away from the connection, and shrinks to a pointed end at the end away from the connection.

[0015] As a further improvement of the above solution, the overlapping portion and the hollow rod-shaped body are formed integrally.

[0016] As a further improvement of the above solution, the length of the overlapping portion is 1 / 4 to 1 / 2 of the length of the hollow rod-shaped body.

[0017] As a further improvement of the above solution, the diameter ratio of the tip of the overlapping portion to the connecting portion is 1:5 to 1:10.

[0018] As a further improvement of the above solution, the surfaces of the first supporting keel and the first hollow skeleton are provided with a bioactive coating or an osteoinductive material to promote the growth and bonding of bone tissue.

[0019] As a further improvement of the above solution, the surface of the first supporting keel is treated with micropores, and the pore size of the micropores is 50-200 μm to promote the growth and integration of bone tissue.

[0020] As a further improvement of the above solution, the bone biocompatible material is one of tantalum, titanium alloy, and cobalt-chromium alloy.

[0021] As a further improvement of the above solution, a receiving through hole for inserting the first supporting keel is provided in the first hollow skeleton.

[0022] In a second aspect, the present invention further provides a pelvic defect support structure, including an acetabular cup, a pelvic bone defect implant prosthesis through the pubic ramus as provided in the first aspect; and an acetabular bone defect implant prosthesis used in conjunction with the pelvic bone defect implant prosthesis through the pubic ramus;

[0023] A first screw is arranged in the first supporting keel of the prosthesis implanted in the pelvic bone defect through the pubic ramus, and is used for fixing the first supporting keel with the pubic ramus;

[0024] The overlapping portion of the pubic ramus pelvic bone defect implant prosthesis overlaps one end of the acetabular bone defect implant prosthesis and is connected by bone cement; the other end of the acetabular bone defect implant prosthesis is provided with a second screw for connecting the acetabular bone defect implant prosthesis to the top wall of the pelvis;

[0025] The acetabular bone defect implant prosthesis is a strip-shaped curved body adapted to the outer contour of the acetabular cup.

[0026] As a further improvement of the above solution, the acetabular bone defect implant prosthesis includes a second supporting keel and a second hollow frame.

[0027] One end of the second supporting keel is provided with a connecting portion connected to the top wall of the pelvis, and the other end of the second supporting keel is provided with a curved plate, and the upper and lower surfaces of the curved plate are lower than the upper and lower surfaces of the connecting portion;

[0028] The cross-sectional dimension of the curved plate along the curvature direction thereof gradually increases from the connecting portion end to the end away from the connecting portion end, and shrinks to a preset cross-sectional dimension near the end surface of the other end of the second supporting keel to adapt to the anatomical shape of the acetabulum;

[0029] The second hollow skeleton is connected to the other end of the second supporting keel through bone cement, and wraps and covers the curved panel;

[0030] The second hollow skeleton also extends out of the other end of the second supporting keel for connection with a prosthesis implanted in the pelvic bone defect through the pubic branch; the second supporting keel and the second hollow skeleton are both made of bone biocompatible materials.

[0031] Since the present invention adopts the above technical solution, the beneficial effects of this application are:

[0032] 1. A pelvic bone defect implant prosthesis through the pubic ramus provided by the present invention can better fit the natural anatomical structure of the pelvis, especially the pubic ramus area, through its unique shape design, and can improve the stability and biomechanical properties of the prosthesis;

[0033] The design of the first supporting keel's sequential double-tube sleeve structure and the accommodating cavity can provide installation space for fixing screws on the basis of meeting the strength support, so as to facilitate the firm fixation of the pelvic bone defect implant prosthesis through the pubic branch in the pubic medullary cavity, and provide strong initial stability; at the same time, the lap joint is connected with the acetabulum bone defect implant prosthesis through bone cement, which further enhances the overall stability of the prosthesis and the bonding force with the surrounding bone tissue;

[0034] The surface of the prosthesis made of bone biocompatible material can promote the growth and integration of bone tissue and reduce the risk of postoperative loosening and infection; this material enables the implanted prosthesis to gradually fuse with the surrounding bone tissue after implantation, promotes the growth and repair of bone tissue, reduces the risk of bone nonunion, and thus achieves a better long-term fixation effect; in particular, the first hollow skeleton is wrapped around the first supporting keel, and the hollow setting provides space for the growth of bone tissue, thereby achieving long-term good fixation of the implanted prosthesis and preventing it from loosening.

[0035] 2. The present invention also provides a pelvic defect support structure, comprising an acetabular cup, a transpubic ramus pelvic bone defect implant prosthesis as provided in the first aspect; and an acetabular bone defect implant prosthesis used in conjunction with the transpubic ramus pelvic bone defect implant prosthesis; the present invention forms a stable support structure by combining the transpubic ramus pelvic bone defect implant prosthesis with the acetabular bone defect implant prosthesis and fixing them with screws and bone cement, thereby significantly improving the overall stability of the pelvic region and reducing the risk of postoperative displacement and loosening;

[0036] The strip-shaped curved body design of the acetabular bone defect implant is adapted to the outer contour of the acetabular cup, which can better fit the natural anatomical structure of the pelvis. This anatomical adaptability not only improves the stability and biomechanical properties of the prosthesis, but also reduces postoperative pain and discomfort.

[0037] The connection between the lap joint and the acetabular bone defect implant prosthesis through bone cement, as well as the porous design or coating on the prosthesis surface, can promote the growth and integration of bone tissue, help improve the long-term stability of the prosthesis, and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0039] Figure 1 It is a bottom view schematic diagram of a prosthesis implanted in a pelvic bone defect through the pubic ramus disclosed by the present invention;

[0040] Figure 2 It is a top view schematic diagram of a prosthesis implanted in a pelvic bone defect through the pubic ramus disclosed in the present invention;

[0041] Figure 3 It is a stereoscopic schematic diagram of a prosthesis implanted in a pelvic bone defect via the pubic ramus disclosed in the present invention;

[0042] Figure 4 It is a front view schematic diagram of the first supporting keel disclosed in the present invention;

[0043] Figure 5 It is a front view schematic diagram of a first hollow skeleton disclosed in the present invention;

[0044] Figure 6 for Figure 5 AA cross-sectional view of ;

[0045] Figure 7 It is a three-dimensional schematic diagram of the first hollow skeleton disclosed in the present invention;

[0046] Figure 8 A three-dimensional structure diagram of a pelvic defect support structure disclosed in the present invention Figure 1 ;

[0047] Fig. 9 A three-dimensional structure diagram of a pelvic defect support structure disclosed in the present invention Figure 2 ;

[0048] Fig.10 It is a front view schematic diagram of the acetabular bone defect implant prosthesis disclosed in the present invention;

[0049] Fig.11 It is a bottom view schematic diagram of the acetabular bone defect implant prosthesis disclosed in the present invention;

[0050] Fig.12 It is a front view schematic diagram of the second supporting keel disclosed in the present invention;

[0051] Fig.13 It is a bottom view schematic diagram of the second supporting keel disclosed in the present invention;

[0052] Fig.14 It is a top view schematic diagram of the second supporting keel disclosed in the present invention;

[0053] Reference numerals:

[0054] 01. Implantation of prosthesis in pelvic bone defect via pubic ramus; 02. Ilium; 03. Pubis; 04. Ischium; 05. Implantation of prosthesis in acetabular bone defect; 06. Acetabular cup;

[0055] 1. first supporting keel; 11. first pipe sleeve; 12. second pipe sleeve; 13. accommodating cavity; 2. first hollow skeleton; 21. hollow rod-shaped body; 22. first end; 23. second end; 24. overlapping portion; 25. accommodating through hole;

[0056] 3. Second supporting keel; 31. Connecting part; 32. Curved plate; 321. Acetabular surface; 322. Pelvic surface; 33. Step surface; 34. Notch; 4. Second hollow skeleton; 41. Connecting end; 5. Connecting hole.

[0057] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0060] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0061] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0062] Example 1

[0063] See also Figure 1-Figure 7 The present invention provides a prosthesis for implanting a pelvic bone defect through the pubic ramus, comprising:

[0064] A first supporting keel 1, comprising a first sleeve 11 and a second sleeve 12 connected to the first sleeve 11, wherein the inner diameter of the first sleeve 11 is greater than that of the second sleeve 12, and the inner cavities of the two sleeves connected to each other form a receiving cavity 13 for fixing a screw in the medullary cavity of the pubic bone 03; the receiving cavity 13 is used to fix the screw in the medullary cavity of the pubic bone 03, thereby ensuring stable fixation of the prosthesis in the pelvic region;

[0065] A first hollow skeleton 2, wrapped around the outside of the first supporting keel 1, the first hollow skeleton 2 comprises a hollow rod-shaped body 21, the hollow rod-shaped body 21 has a first end 22 and a second end 23 arranged opposite to each other; wherein the first end 22 is used to connect with the acetabular bone defect implant prosthesis 05, and the second end 23 is used to connect with the pubic branch;

[0066] The overlapping portion 24 extends from the side of the first end 22 and is used to overlap with the acetabular bone defect implant prosthesis 05 through bone cement, thereby enhancing the overall stability of the prosthesis and the bonding force with the surrounding bone tissue;

[0067] The hollow rod-shaped body 21 gradually increases in size from the second end 23 to the first end 22 along its length. This design conforms to the anatomical structure of the pelvis and can better fit the natural shape of the pelvis. The end face of the second end 23 is an arc-shaped surface convex outward. The arc-shaped design can better fit the surface of the pubic branch, reduce stress concentration, and provide better biomechanical properties.

[0068] The first supporting keel 1 and the first hollow skeleton 2 are both made of bone biocompatible materials; bone biocompatible materials have good biocompatibility and mechanical properties, can promote the growth and integration of bone tissue, and reduce the risk of postoperative infection and rejection; in this embodiment, the first supporting keel 1 and the first hollow skeleton 2 are both made of porous tantalum alloy, with a porosity of ≥60%, an elastic modulus of 3-5GPa, and are preferably treated with a surface hydroxyapatite coating;

[0069] The pubic ramus pelvic bone defect implant prosthesis 01 of the present invention can better fit the natural anatomical structure of the pelvis, especially the pubic ramus area, through its unique shape design, and can improve the stability and biomechanical properties of the prosthesis;

[0070] The design of the first supporting keel 1 with a double-tube sleeve structure and a receiving cavity 13 can provide installation space for fixing screws on the basis of meeting the strength support, so as to facilitate the pelvic bone defect implant prosthesis 01 through the pubic branch to be firmly fixed in the medullary cavity of the pubic bone 03, providing strong initial stability; at the same time, the lap joint 24 is connected with the acetabulum bone defect implant prosthesis 05 through bone cement, which further enhances the overall stability of the prosthesis and the bonding force with the surrounding bone tissue;

[0071] The surface of the prosthesis made of bone biocompatible material can promote the growth and integration of bone tissue and reduce the risk of postoperative loosening and infection; this material enables the implanted prosthesis to gradually fuse with the surrounding bone tissue after implantation, promotes the growth and repair of bone tissue, reduces the risk of bone nonunion, and thus achieves a better long-term fixation effect; especially the first hollow skeleton 2 is wrapped around the first supporting keel 1, and the hollow setting provides space for the growth of bone tissue, thereby achieving the implanted prosthesis to be well fixed for a long time and not easy to loosen.

[0072] As a preferred embodiment, see Figure 1-Figure 3 The first supporting keel 1 is tiltedly arranged in the hollow rod-shaped body 21, and the first sleeve 11 end thereof faces the first end 22 of the first hollow skeleton 2; through such tilted arrangement, the structural stability and bearing capacity can be effectively enhanced; thereby, the pubic branch pelvic bone defect implant prosthesis 01 can be firmly fixed on the pubic branch, thereby improving the stability of the prosthesis installation;

[0073] The end of the second sleeve 12 away from the first sleeve 11 has an end surface adapted to the shape of the hollow rod-shaped body 21, thereby ensuring a tight fit between the first supporting keel 1 and the hollow rod-shaped body 21 and avoiding structural looseness caused by shape mismatch.

[0074] As a preferred embodiment, see Figure 6 , the central axis JJ of the hollow rod-shaped body 21 forms a first preset angle a with the central axis II of the first supporting keel 1; in the present embodiment, the range of the first preset angle a is preferably 7°≤a≤13°; by limiting the range of the angle a, the first supporting keel 1 can form an optimal supporting angle in the hollow rod-shaped body 21, thereby reducing the use of materials and reducing manufacturing costs while ensuring structural strength.

[0075] As a preferred embodiment, see Figure 6 , the central axis KK of the overlapping portion 24 forms a second preset angle b with the central axis JJ of the hollow rod-shaped body 21; in the present embodiment, the range of the second preset angle is 35°≤b≤41°; by setting the angle b, a stable connection relationship can be formed between the overlapping portion 24 and the hollow rod-shaped body 21, and at the same time, the overlapping portion 24 is facilitated to be installed in coordination with other components.

[0076] As a preferred embodiment, Figure 7As shown, the cross-sectional size of the overlapping portion 24 gradually decreases along its axial extension direction from the connection with the hollow rod-shaped body 21 to the distal end, forming a continuously converging conical transition structure, and forming a pointed end at the end away from the connection. This tapered structural design is conducive to improving the bonding strength between the overlapping portion 24 and the acetabular bone defect implant prosthesis 05, while reducing the insertion resistance.

[0077] As a preferred embodiment, the overlapping portion 24 and the hollow rod-shaped body 21 are integrally formed using homogeneous materials through injection molding or 3D printing, which can effectively eliminate stress concentration at the connection interface and significantly improve the mechanical strength and fatigue resistance of the overall structure.

[0078] As a preferred embodiment, the ratio of the axial length L1 of the overlap portion 24 to the total length L2 of the hollow rod-shaped body 21 is 1:4~1:2; more preferably, L1:L2=1:3.5~1:2.5. This length ratio range can ensure sufficient connection contact area and avoid material waste caused by excessive length of the overlap portion 24.

[0079] As a preferred embodiment, the ratio of the maximum outer diameter D1 of the tip to the reference outer diameter D2 of the connection is 1:5-1:10. This diameter ratio range can achieve a good guiding connection function while ensuring structural strength.

[0080] It should be noted that the above-mentioned size ratio parameters are optimization ranges obtained through a large number of finite element simulations and experimental verifications, and in the embodiments, they can be adaptively adjusted within the above-mentioned ratio range according to the actual application scenario.

[0081] As a preferred embodiment, the surfaces of the first supporting keel 1 and the first hollow skeleton 2 are both provided with a bioactive coating or an osteoinductive material to promote the growth and bonding of bone tissue;

[0082] The biological coating can be a hydroxyapatite-based bioactive coating or a rhBMP-2 bone morphogenetic protein composite coating, the coating thickness of which is controlled in the range of 20-150 μm, and a gradient transition layer is formed by a plasma spraying process. The coating structure can effectively promote the directional migration and differentiation of osteoblasts and realize chemical bonding between the implant and the bone interface.

[0083] As a preferred embodiment, the surface of the first supporting keel 1 is microporous, and the pore size of the micropores is 50-200 μm, so as to promote the growth and integration of bone tissue, and further improve the biocompatibility and stability of the implant prosthesis;

[0084] In this embodiment, the microporation treatment adopts a laser drilling process to form a honeycomb microporous array with a pore size of 100±20 μm on the surface of the first supporting keel 1, the porosity is controlled between 65%-75%, and the microporous depth is 200-300 μm.

[0085] As a preferred embodiment, the bone biocompatible material is one of tantalum, titanium alloy, and cobalt-chromium alloy; in this embodiment, the bone biocompatible material is tantalum material, which can significantly improve the bone integration ability of the implanted prosthesis.

[0086] As a preferred embodiment, a receiving through hole 25 for inserting the first supporting keel 1 is provided in the first hollow skeleton 2; and the receiving through hole 25 matches the shape of the first supporting keel 1; such a setting can ensure the close fit between the first supporting keel 1 and the first hollow skeleton 2, thereby improving the overall structural stability of the prosthesis.

[0087] Example 2

[0088] See also Figure 8-Figure 14 The present invention provides a pelvic defect support structure for repairing complex defects in the pelvic region, especially defects involving the acetabulum and pubic ramus; the following is a detailed description of a specific embodiment:

[0089] The pelvic defect support structure comprises an acetabular cup 06, a pelvic bone defect implant prosthesis 01 through the pubic ramus as provided in Example 1; and an acetabular bone defect implant prosthesis 05 used in conjunction with the pelvic bone defect implant prosthesis 01 through the pubic ramus; the acetabular cup 06 is used to replace or repair the defect in the acetabulum area and provide support and stability for the hip joint;

[0090] The first supporting keel 1 of the prosthesis 01 implanted in the pelvic bone defect through the pubic ramus is provided with a first screw for fixing it to the pubic ramus; the first screw is used to fix it to the pubic ramus, thereby ensuring the stability and firmness of the prosthesis in the pubic ramus area;

[0091] The overlapping portion 24 of the pubic branch pelvic bone defect implant prosthesis 01 overlaps one end of the acetabular bone defect implant prosthesis 05 and is connected by bone cement; the other end of the acetabular bone defect implant prosthesis 05 is provided with a second screw for connecting the acetabular bone defect implant prosthesis 05 with the top wall of the pelvis; the connection method of the overlapping portion 24 not only enhances the bonding force between the prostheses, but also promotes the growth and integration of bone tissue; the acetabular bone defect implant prosthesis 05 is connected to the top wall of the pelvis by the second screw, thereby enhancing the stability of the entire supporting structure and ensuring its firm fixation in the pelvic area;

[0092] The acetabular bone defect implant prosthesis 05 is a strip-shaped curved body adapted to the outer contour of the acetabular cup 06, so that the prosthesis can better fit the anatomical structure of the acetabular area and provide good support and stability;

[0093] During the operation, the acetabular bone defect implant prosthesis 05 is first placed in the acetabular area and fixed to the top wall of the pelvis by a second screw;

[0094] Next, the overlapping portion 24 of the pelvic bone defect implant prosthesis 01 through the pubic ramus is connected to one end of the acetabular bone defect implant prosthesis 05 through bone cement, and the first supporting keel 1 is fixed to the pubic ramus by a first screw;

[0095] Finally, the acetabular cup 06 is installed to ensure its compatibility with the acetabular bone defect implant prosthesis 05, completing the installation of the entire pelvic defect support structure;

[0096] The present invention forms a stable support structure by combining the pubic ramus pelvic bone defect implant prosthesis 01 with the acetabular bone defect implant prosthesis 05 and fixing them by screws and bone cement, thereby significantly improving the overall stability of the pelvic region and reducing the risk of postoperative displacement and loosening.

[0097] In order to verify the stability of the pelvic defect support structure, a pelvic model test was carried out in a laboratory environment. The pubic ramus pelvic bone defect implant prosthesis 01 and the acetabular bone defect implant prosthesis 05 were implanted into the simulated acetabular bone defect, respectively, and the stability of the implant prosthesis in different stress directions was tested. The results showed that the pelvic defect support structure had good supporting capacity under both vertical and horizontal stresses.

[0098] In order to further verify the stability of the pelvic defect support structure, a repair surgery was performed on a patient with acetabulum bone defect. The specific implantation steps are as follows:

[0099] Before surgery, the acetabular defect morphology is reconstructed in three dimensions based on CT data, and the inclination angle and length of the first supporting keel 1 are personalized, and then the first hollow skeleton 2 is designed to match; the curvature radius of the curved plate 32 and the length of the connecting end 41 of the second supporting keel 3 are personalized, and then the second hollow skeleton 4 is designed to match;

[0100] Pre-treat the defect area;

[0101] See also Figure 8 and Fig. 9, filling the pelvic bone defect implanted prosthesis 01 through the pubic branch and the acetabular bone defect implanted prosthesis 05: first fix the connecting part 31 to the top wall of the pelvic ilium 02 through the second screw, inject bone cement into the gap between the second hollow skeleton 4 and the host bone, and after curing, connect it to the pelvic bone defect implanted prosthesis 01 through the connecting end 41, and then pass through the first supporting keel 1 through the first fixing screw to fix the pelvic bone defect implanted prosthesis 01 through the pubic branch to the host pubic branch; the two implanted prostheses are arranged between the ilium 02 and the pubis 03 and the ischium 04 to form a support beam, so that the repair of the pelvic defect using this support structure has a stable support effect and is convenient for fusion with the host bone tissue; follow-up 3 months after surgery showed that the implanted prosthesis of the acetabular bone defect was well integrated with the bone tissue.

[0102] As a preferred embodiment, see Figure 10-Figure 14 The acetabular bone defect implant prosthesis 05 comprises a second supporting keel 3 and a second hollow skeleton 4. The second supporting keel 3 is designed with a bionic anatomical morphology.

[0103] One end of the second supporting keel 3 is provided with an arc-shaped connecting portion 31 connected to the top wall of the pelvis, and the other end of the second supporting keel 3 is provided with a curved panel 32, and the second hollow skeleton 4 is fixed to the other end of the second supporting keel 3 by bone cement, wrapping and covering the curved panel 32; specifically, the upper and lower surfaces of the connecting portion 31 are curved structures, and the radius of the arc is 50-70 mm, preferably matching the curvature of the top wall of the pelvis; the connecting portion 31 is provided with a plurality of bone screw connecting holes 5, the aperture of the connecting holes 5 is 3.5-5.0 mm, and the connecting holes 5 are evenly spaced along the arc direction of the connecting portion 31;

[0104] The upper and lower surfaces of the curved plate 32 are lower than the upper and lower surfaces of the connecting portion 31. For details, see Fig.13 , which faces the lower surface of the acetabulum, is the acetabular surface 321; see Fig.14 , away from the upper surface of the acetabulum, is the pelvic surface 322; two upper and lower step surfaces 33 are formed at the joint with the connecting portion 31, so as to facilitate the wrapping and covering of the second hollow skeleton 4 to promote the growth of bone tissue;

[0105] The cross-sectional dimension of the curved plate 32 along the curvature direction thereof gradually increases from the end of the connecting portion 31 to the end away from the connecting portion 31, and shrinks to a preset cross-sectional area near the end surface of the other end of the second supporting keel 3 to adapt to the anatomical morphology of the acetabulum; the thickness of the curved plate 32 gradually increases from the connecting portion 31 to the distal end, and the distal end shrinks at a preset shrinkage angle to form a preset end surface. Specifically, a notch 34 is formed at the distal end of the curved plate 32 when shrinking;

[0106] And the second hollow skeleton 4 also extends out of the other end of the second supporting keel 3 to form a connecting end 41. Specifically, the second hollow skeleton 4 includes a main frame and a connecting end 41. The main frame wraps the surface of the curved panel 32, and its grid unit is preferably a diamond structure; the connecting end 41 is 20-40 mm long and is used to connect to the pelvic bone defect implant prosthesis 01 through the pubic branch; the second supporting keel 3 and the second hollow skeleton 4 are both made of bone biocompatible materials.

[0107] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A prosthesis for implanting a pelvic bone defect through the pubic ramus, characterized in that: include: A first supporting keel, the first supporting keel comprising a first sleeve and a second sleeve connected to the first sleeve, wherein the inner diameter of the first sleeve is larger than that of the second sleeve, and the inner cavities of the two sleeves connected to each other constitute an accommodating cavity for a screw fixed in the pubic medullary cavity; A first hollow frame wrapped around the first supporting keel, wherein the first hollow frame comprises a hollow rod-shaped body, and the hollow rod-shaped body has a first end and a second end that are oppositely disposed; The first end is used to connect with the acetabular bone defect implant prosthesis, and the side of the first end also extends to form a lap joint portion, which is used to overlap the acetabular bone defect implant prosthesis through bone cement; the second end is used to connect with the pubic branch; The hollow rod-shaped body gradually increases in size from the second end to the first end along its length direction, and the end face of the second end is an arc-shaped face convex outward; the first supporting keel and the first hollow skeleton are both made of bone biocompatible material.

2. The transpubic ramus pelvic bone defect implant prosthesis according to claim 1, characterized in that: The first supporting keel is obliquely disposed in the hollow rod-shaped body, and the first sleeve end thereof faces the first end of the first hollow skeleton; The end of the second tube sleeve away from the first tube sleeve has an end surface adapted to the outer shape of the hollow rod-shaped body.

3. A transpubic ramus pelvic bone defect implant prosthesis according to claim 1 or 2, characterized in that: The central axis of the hollow rod-shaped body forms a first preset angle a with the central axis of the first supporting keel.

4. The transpubic ramus pelvic bone defect implant prosthesis according to claim 3, characterized in that: The central axis of the overlapping portion and the central axis of the hollow rod-shaped body form a second preset angle b.

5. The transpubic ramus pelvic bone defect implant prosthesis according to claim 1 or 2, characterized in that: The overlapping portion gradually narrows along its length direction from the connection with the hollow rod-shaped body to the end away from the connection, and narrows to a pointed end at the end away from the connection.

6. The transpubic ramus pelvic bone defect implant prosthesis according to claim 5, characterized in that: The length of the overlapping portion is 1 / 4 to 1 / 2 of the length of the hollow rod-shaped body; The diameter ratio of the tip of the overlapping portion to the connecting portion is 1:5 to 1:

10.

7. The transpubic ramus pelvic bone defect implant prosthesis according to claim 1 or 2, characterized in that: The surfaces of the first supporting keel and the first hollow skeleton are both provided with a bioactive coating or an osteoinductive material to promote the growth and bonding of bone tissue.

8. The transpubic ramus pelvic bone defect implant prosthesis according to claim 1 or 2, characterized in that: The bone biocompatible material is one of tantalum, titanium alloy and cobalt-chromium alloy.

9. A pelvic defect support structure, characterized in that: It comprises an acetabular cup, a transpubic ramus pelvic bone defect implant prosthesis as claimed in any one of claims 1 to 8; and an acetabular bone defect implant prosthesis used in conjunction with the transpubic ramus pelvic bone defect implant prosthesis; A first screw is arranged in the first supporting keel of the prosthesis implanted in the pelvic bone defect through the pubic ramus, and is used for fixing the first supporting keel with the pubic ramus; The overlapping portion of the pubic ramus pelvic bone defect implant prosthesis overlaps one end of the acetabular bone defect implant prosthesis and is connected by bone cement; the other end of the acetabular bone defect implant prosthesis is provided with a second screw for connecting the acetabular bone defect implant prosthesis to the top wall of the pelvis; The acetabular bone defect implant prosthesis is a strip-shaped curved body adapted to the outer contour of the acetabular cup.

10. The pelvic defect support structure according to claim 9, characterized in that: The acetabular bone defect implant prosthesis comprises a second supporting keel and a second hollow frame. One end of the second supporting keel is provided with a connecting portion connected to the top wall of the pelvis, and the other end of the second supporting keel is provided with a curved plate, and the upper and lower surfaces of the curved plate are lower than the upper and lower surfaces of the connecting portion; The cross-sectional dimension of the curved plate along the curvature direction thereof gradually increases from the connecting portion end to the end away from the connecting portion end, and shrinks to a preset cross-sectional dimension near the end surface of the other end of the second supporting keel to adapt to the anatomical shape of the acetabulum; The second hollow frame is connected to the other end of the second supporting keel through bone cement, and wraps and covers the curved panel; The second hollow skeleton also extends out of the other end of the second supporting keel for connection with the pelvic bone defect implant prosthesis through the pubic branch.

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