Tibia prosthesis structure

Abstract

The utility model relates to the technical field of orthopedic medical instruments, and discloses a tibial prosthesis structure. Comprising a tibia prosthesis and a medullary cavity insertion section which are detachably connected, a first groove is formed in the outer side wall of the tibia prosthesis, a third groove is formed in the outer side wall of the medullary cavity insertion section, and the first groove and the third groove are sequentially communicated to form a long groove used for placing an implanted bone. The long groove is a bone grafting space extending in the length direction of the tibia prosthesis structure, the bone grafting material is contained in the long groove, on one hand, the bone grafting part can be prevented from protruding after an operation, and the occurrence rate of wound complications is reduced; on the other hand, healing of the patellar ligament and the bone grafting part is facilitated, the patellar ligament fracture risk is reduced, and the knee joint function of a patient is improved.

Description

Technical Field

[0001] This utility model relates to the field of orthopedic medical device technology, and in particular to a tibial prosthesis structure. Background Technology

[0002] Malignant bone tumors, including primary and secondary types, are diseases of the musculoskeletal system that seriously threaten patients' survival and quality of life. These tumors are highly invasive and metastatic, rapidly destroying bone structure, affecting limb function, and even endangering life. With the continuous advancement of medical technology, limb-sparing surgery has become an effective treatment option for malignant bone tumors.

[0003] The proximal tibia is one of the sites of malignant bone tumors. For malignant bone tumors in the proximal tibia and other sites, tibial prosthesis replacement surgery is commonly used as a surgical option. This surgical option involves removing the diseased bone portion and implanting an artificial prosthesis to reconstruct the bone structure and restore function.

[0004] However, current tibial prostheses are primarily cylindrical in design, lacking proper bone grafting channels. This leads to insecure healing of the patellar ligament and soft tissues, making them prone to rupture and causing knee extension dysfunction. In cases requiring bone graft fusion, this can cause localized bulging at the graft site, increasing wound tension and the incidence of complications. Furthermore, bone grafting promotes healing of the patellar ligament and graft site, reducing the risk of patellar ligament rupture. Additionally, when the knee is flexed or extended, the bulging graft site can collide or rub against surrounding tissues, causing localized pain and other symptoms. Utility Model Content

[0005] The technical problem this invention aims to solve is that current tibial prosthesis structures lack bone graft channels, the patellar ligament and soft tissue do not heal firmly, and are prone to breakage, leading to knee extension dysfunction. In cases requiring bone graft fusion, the graft site may bulge, increasing the incidence of postoperative wound complications. Once prosthesis infection occurs, amputation may be necessary in severe cases.

[0006] To solve the above-mentioned technical problems, this utility model provides a tibial prosthesis structure, including a tibial prosthesis and a medullary canal insertion segment. The medullary canal insertion segment is inserted into the tibial prosthesis. A first groove is provided on the outer side wall of the tibial prosthesis, and a third groove is provided on the outer side wall of the medullary canal insertion segment. The first groove and the third groove are sequentially connected to form a long groove for placing bone grafts.

[0007] Preferably, a number of tibial prosthesis connecting segments are provided between the tibial prosthesis and the medullary canal insertion segment. The multiple tibial prosthesis connecting segments are inserted end to end in sequence. The tibial prosthesis connecting segment at the top is inserted into the tibial prosthesis, and the tibial prosthesis connecting segment at the bottom is inserted into the medullary canal insertion segment. A second groove is provided on the outer wall of each tibial prosthesis connecting segment. The first groove, each second groove and the third groove are connected in sequence to form a long groove for placing bone grafts.

[0008] Preferably, the cross-sections of the first groove, each of the second grooves, and the third groove are all arc-shaped, and the long groove is an arc-shaped long groove.

[0009] Preferably, the depth of the arc-shaped long groove ranges from 4 mm to 6 mm, and the width ranges from 13 mm to 17 mm.

[0010] Preferably, the depth of the arc-shaped long groove is 5mm and the width is 15mm.

[0011] Preferably, the bottom of the tibial prosthesis is provided with a first slot, the top of each tibial prosthesis connecting segment is provided with a first insertion part, the bottom of the tibial prosthesis connecting segment is provided with a second slot, and multiple tibial prosthesis connecting segments are sequentially inserted end to end through the cooperation of the first insertion part and the second slot. The top of the medullary canal insertion segment is provided with a second insertion part, and the bottom of the medullary canal insertion segment is provided with an insertion needle.

[0012] The tibial prosthesis connecting segment at the top is inserted into the tibial prosthesis through the cooperation of the first insertion part and the first slot, and the tibial prosthesis connecting segment at the bottom is inserted into the medullary canal insertion segment through the cooperation of the first insertion part and the second slot.

[0013] Preferably, each of the first and second plug-in portions is frustum-shaped, and the shapes of the first slot and each of the second slots are matched with the frustum.

[0014] Preferably, each of the first and second plug-in portions is cylindrical, and the shapes of the first slot and each of the second slots are matched with the cylinder.

[0015] Preferably, each of the first insertion parts is integrally formed with the tibial prosthesis connecting segment, and the second insertion part is integrally formed with the medullary cavity insertion segment.

[0016] Preferably, the first slot is located in the middle of the bottom of the tibial prosthesis, and the two ends of the first slot are also provided with first positioning grooves. Each first insertion part is located in the middle of the top of the tibial prosthesis connecting segment, and the two ends of each first insertion part are also provided with first positioning parts. Each second slot is located in the middle of the bottom of the tibial prosthesis connecting segment, and the two ends of each second slot are also provided with second positioning grooves. The insertion angle between multiple tibial prosthesis connecting segments is effectively limited by the cooperation of the first positioning parts and the second positioning grooves. The second insertion part is located in the middle of the top of the medullary canal insertion segment, and the two ends of the second insertion part are also provided with second positioning parts.

[0017] The insertion angle between the tibial prosthesis connecting segment at the top and the tibial prosthesis is effectively limited by the cooperation of the first positioning part and the first positioning groove. The insertion angle between the tibial prosthesis connecting segment at the bottom and the medullary canal insertion segment is effectively limited by the cooperation of the second positioning part and the second positioning groove.

[0018] Compared with the prior art, the tibial prosthesis structure of this utility model has the following advantages:

[0019] A first groove is provided on the lateral wall of the tibial prosthesis, and a third groove is provided on the lateral wall of the medullary canal insertion segment. The first and third grooves are connected in sequence to form a long groove for placing bone grafts. The long groove is the bone graft space extending along the length of the tibial prosthesis structure. Containing the bone graft material in the long groove can prevent the bone graft site from bulging after surgery and reduce the incidence of wound complications. On the other hand, it is conducive to the healing of the patellar ligament and the bone graft site, reduces the risk of patellar ligament rupture, and improves the patient's knee joint function. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the tibial prosthesis structure according to an embodiment of the present invention;

[0021] Figure 2 This is a front view of the tibial prosthesis structure according to an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the tibial prosthesis according to an embodiment of the present invention;

[0023] Figure 4 This is a front view of the tibial prosthesis according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the tibial prosthesis connecting segment according to an embodiment of the present invention;

[0025] Figure 6 This is a front view of the tibial prosthesis connecting segment according to an embodiment of this utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the medullary cavity insertion segment according to an embodiment of the present invention;

[0027] Figure 8 This is a front view of the medullary cavity insertion segment according to an embodiment of the present invention.

[0028] In the figure, 1 is the tibial prosthesis; 10 is the first groove; 2 is the tibial prosthesis connecting segment; 20 is the second groove; 21 is the first insertion part; 3 is the medullary canal insertion segment; 30 is the third groove; 31 is the second insertion part; 32 is the insertion needle; 4 is the femoral prosthesis; 5 is the gasket; and 6 is the connecting rod. Detailed Implementation

[0029] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0030] In the description of this utility model, it should be understood that the term "tibial prosthesis" is used. A tibial prosthesis is a medical device used to repair or replace parts of the tibial structure. It is usually made of titanium alloy, cobalt-chromium-molybdenum alloy, or other medical-grade metal materials, and sometimes includes materials such as polyethylene in the metal tray. The tibial prosthesis matches the shape and structure of the tibia and is mainly used to treat tibial injuries caused by diseases such as tibial tumors. By surgically implanting a tibial prosthesis, the continuity and integrity of the tibia can be restored, thereby reducing pain, improving joint function, and improving the patient's quality of life.

[0031] A femoral prosthesis is an artificial device used to replace or repair damaged parts of the femur. It is typically made of medical-grade metallic materials (such as titanium alloys, cobalt-chromium-molybdenum alloys, etc.), and sometimes may include other materials such as ceramics or plastics to mimic the natural structure and function of the femur. Surgical implantation of a femoral prosthesis can restore the continuity and integrity of the femur, thereby reducing pain, improving joint function, and enhancing the patient's quality of life.

[0032] Bone grafting is a surgical procedure that transplants bone tissue into areas of bone loss, requiring reinforcement, or fusion. Due to the different sources of bone, it is divided into autologous bone grafting and allogeneic bone grafting. With advancements in refrigeration equipment and aseptic preservation techniques, allogeneic bone is stored in bone banks. Common applications include bone defects, nonunion fractures, filling cavities left after curettage of cystic lesions or benign tumors, spinal cord fusion, and joint fusion. Autologous bone grafts can be taken from the middle of the anteromedial aspect of the tibia, the upper segment of the fibula, the iliac wing, ribs, and healthy bone from the distal end of a severed limb.

[0033] like Figures 1 to 8 As shown, a preferred embodiment of the present invention provides a tibial prosthesis structure, including a tibial prosthesis 1 and a medullary canal insertion segment 3. The medullary canal insertion segment 3 is inserted into the tibial prosthesis 1. A first groove 10 is provided on the outer wall of the tibial prosthesis 1, and a third groove 30 is provided on the outer wall of the medullary canal insertion segment 3. The first groove 10 and the third groove 30 are sequentially connected to form a long groove for placing bone grafts.

[0034] The surgeon can install several tibial prosthesis connecting segments 2 between the tibial prosthesis 1 and the medullary canal insertion segment 3, according to the actual needs of the surgery, to assemble a tibial prosthesis structure of appropriate length. Multiple tibial prosthesis connecting segments 2 are inserted end-to-end. The top tibial prosthesis connecting segment 2 is inserted into the tibial prosthesis 1, and the bottom tibial prosthesis connecting segment 2 is inserted into the medullary canal insertion segment 3. Each tibial prosthesis connecting segment 2 has a second groove 20 on its lateral wall. The first groove 10, each second groove 20, and the third groove 30 are sequentially connected to form a long groove for placing bone grafts. This long groove is the bone graft space extending along the length of the tibial prosthesis structure. Containing the bone graft material in the long groove can prevent postoperative swelling at the graft site, reducing the incidence of wound complications; on the other hand, it is conducive to the healing of the patellar ligament and the bone graft site, reducing the risk of patellar ligament rupture and improving the patient's knee joint function.

[0035] Specifically, the cross-sections of the first groove 10, each of the second grooves 20, and the third groove 30 are all arc-shaped, and the long groove is an arc-shaped long groove. Setting the long groove to be arc-shaped conforms to the natural curve of the human skeleton, and it fits well with the bone graft material (such as autologous fibula), further improving the biomechanical performance of the tibial prosthesis and the patient's rehabilitation effect.

[0036] The depth of the arc-shaped groove ranges from 4 mm to 6 mm, and the width ranges from 13 mm to 17 mm. Preferably, the depth of the arc-shaped groove is 5 mm and the width is 15 mm. Limiting the dimensions of the arc-shaped groove ensures that sufficient space is provided for the bone graft material without excessively weakening the structural strength of the tibial prosthesis.

[0037] Specifically, the tibial prosthesis 1 has a first slot at its bottom, each tibial prosthesis connecting segment 2 has a first insertion part 21 at its top, and the tibial prosthesis connecting segment 2 has a second slot at its bottom. Multiple tibial prosthesis connecting segments 2 are sequentially inserted end to end through the cooperation of the first insertion part 21 and the second slot. The medullary canal insertion segment 3 has a second insertion part 31 at its top and an insertion needle 32 at its bottom. The tibial prosthesis connecting segment 2 located at the top is inserted into the tibial prosthesis 1 through the cooperation of the first insertion part 21 and the first slot, and the tibial prosthesis connecting segment 2 located at the bottom is inserted into the medullary canal insertion segment 3 through the cooperation of the first insertion part 21 and the second slot.

[0038] By setting plug-in parts at the top of each structure and slots at the bottom, the tibial prosthesis structure achieves simple and reliable overall docking of the tibial prosthesis structure through plug-in connection. The bottom of the medullary canal insertion segment 3 is equipped with an insertion pin 32 for insertion into the tibia, achieving precise fixation of the tibial prosthesis structure to the tibia.

[0039] Specifically, each of the first insertion parts 21 and the second insertion parts 31 is truncated cone-shaped, and the shapes of the first slot and each of the second slots are matched with the truncated cone, which effectively enhances the stability of the insertion between components, prevents loosening or dislocation caused by external forces, and further improves the overall stability, flexibility and durability of the tibial prosthesis.

[0040] Specifically, each of the first insertion parts 21 is integrally formed with the tibial prosthesis connecting segment 2, and the second insertion part 31 is integrally formed with the medullary cavity insertion segment 3.

[0041] Specifically, the first slot is located at the middle of the bottom of the tibial prosthesis 1, and the two ends of the first slot are also provided with first positioning grooves. Each first insertion part 21 is located at the middle of the top of the tibial prosthesis connecting segment 2, and the two ends of each first insertion part 21 are also provided with first positioning parts. Each second slot is located at the middle of the bottom of the tibial prosthesis connecting segment 2, and the two ends of each second slot are also provided with second positioning grooves. The insertion angle between multiple tibial prosthesis connecting segments 2 is effectively limited by the cooperation of the first positioning parts and the second positioning grooves. The second insertion part 31 is located at the middle of the top of the medullary canal insertion segment 3, and the two ends of the second insertion part 31 are also provided with second positioning parts. The insertion angle between the top tibial prosthesis connecting segment 2 and the tibial prosthesis 1 is effectively limited by the cooperation of the first positioning parts and the first positioning grooves. The insertion angle between the bottom tibial prosthesis connecting segment 2 and the medullary canal insertion segment 3 is effectively limited by the cooperation of the second positioning parts and the second positioning grooves.

[0042] The positioning groove and positioning part work together to effectively limit the insertion angle between the components, and can also effectively prevent the tibial prosthesis and connecting segment from shifting or loosening during or after surgery, thereby improving the stability and service life of the prosthesis.

[0043] The tibial prosthesis 1 is also provided with a femoral prosthesis 4 at its top. A spacer 5 is provided between the femoral prosthesis 4 and the tibial prosthesis 1. The top of the tibial prosthesis 1 is provided with positioning protrusions on all four sides. The positioning protrusions effectively position the spacer 5. A connecting rod 6 is fixed on the femoral prosthesis 4. Both the tibial prosthesis 1 and the spacer 5 are provided with perforations for the connecting rod 6 to pass through. The tibial prosthesis 1 and the spacer 5 are connected to the femoral prosthesis 4 through the connecting rod 6.

[0044] In other embodiments of this application, the cross-sections of the first groove 10, each of the second grooves 20 and the third groove 30 are all rectangular. The rectangular design makes the manufacturing and processing of the grooves simpler and more precise, reducing production costs and manufacturing difficulty.

[0045] In other embodiments of this application, each of the first insertion portions 21 and the second insertion portions 31 is a cylinder with the same dimensions from top to bottom, and the slots that mate with each of the first insertion portions 21 and the second insertion portions 31 are also cylindrical. This maintains good insertion tightness and structural stability, making it suitable for rapid assembly under different surgical requirements.

[0046] The working process of this utility model is as follows: According to the actual needs of the surgery, an appropriate number of tibial prosthesis connecting segments are selected. Under the guidance of the positioning grooves and positioning parts on each component of the tibial prosthesis structure, the tibial prosthesis, at least zero tibial prosthesis connecting segments and medullary canal insertion segments are sequentially inserted by utilizing the cooperation of the top insertion part and the bottom slot of each component to form a stable connected tibial prosthesis structure. A first groove is provided on the outer wall of the tibial prosthesis, a second groove is provided on the outer wall of each tibial prosthesis connecting segment, and a third groove is provided on the outer wall of the medullary canal insertion segment. The first groove, each second groove and the third groove are sequentially connected to form a long groove for placing bone grafts.

[0047] In summary, this utility model embodiment provides a tibial prosthesis structure. A first groove is provided on the lateral wall of the tibial prosthesis, a second groove is provided on the lateral wall of each connecting segment of the tibial prosthesis, and a third groove is provided on the lateral wall of the medullary canal insertion segment. The first groove, each of the second grooves, and the third groove are sequentially connected to form a long groove for placing bone grafts. By creating a long groove on the lateral wall of the tibial prosthesis structure to accommodate bone grafts, on the one hand, accommodating the bone graft material in the long groove can prevent postoperative bulging at the graft site, reducing the incidence of wound complications. On the other hand, bone grafting promotes the healing of the patellar ligament and the graft site, reduces the risk of patellar ligament rupture, and improves the patient's knee joint function.

[0048] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A tibial prosthetic structure comprising a tibial prosthesis (1) and a medullary canal insertion segment (3), the medullary canal insertion segment (3) being inserted with the tibial prosthesis (1), characterized in that, The lateral wall of the tibial prosthesis (1) is provided with a first groove (10), the lateral wall of the medullary cavity insertion section (3) is provided with a third groove (30), and the first groove (10) and the third groove (30) are sequentially communicated to form a long groove for placing bone graft.

2. A tibial prosthesis according to claim 1, wherein, The tibial prosthesis (1) and the medullary cavity insertion section (3) are further provided with a plurality of tibial prosthesis connecting sections (2), the plurality of tibial prosthesis connecting sections (2) are sequentially connected in a head-to-tail manner, the tibial prosthesis connecting section (2) at the top is connected with the tibial prosthesis (1), the tibial prosthesis connecting section (2) at the bottom is connected with the medullary cavity insertion section (3), the lateral wall of each tibial prosthesis connecting section (2) is provided with a second groove (20), and the first groove (10), the second groove (20), and the third groove (30) are sequentially communicated to form a long groove for placing bone graft.

3. A tibial prosthesis according to claim 2, wherein, The first groove (10), the second groove (20), and the third groove (30) are all arc-shaped in cross section, and the long groove is an arc-shaped long groove.

4. A tibial prosthesis according to claim 3, wherein, The depth of the arc-shaped long groove ranges from 4 mm to 6 mm, and the width of the arc-shaped long groove ranges from 13 mm to 17 mm.

5. A tibial prosthesis according to claim 4, wherein, The depth of the arc-shaped long groove is 5 mm, and the width of the arc-shaped long groove is 15 mm.

6. The tibial prosthesis of claim 2 wherein, The bottom of the tibial prosthesis (1) is provided with a first insertion slot, the top of each tibial prosthesis connecting section (2) is provided with a first insertion part (21), the bottom of each tibial prosthesis connecting section (2) is provided with a second insertion slot, the plurality of tibial prosthesis connecting sections (2) are sequentially connected in a head-to-tail manner through the cooperation of the first insertion part (21) and the second insertion slot, the top of the medullary cavity insertion section (3) is provided with a second insertion part (31), and the bottom of the medullary cavity insertion section (3) is provided with an insertion needle (32). The tibial prosthesis connecting section (2) at the top is connected with the tibial prosthesis (1) through the cooperation of the first insertion part (21) and the first insertion slot, and the tibial prosthesis connecting section (2) at the bottom is connected with the medullary cavity insertion section (3) through the cooperation of the first insertion part (21) and the second insertion slot.

7. A tibial prosthesis according to claim 6, wherein, Each first insertion part (21) and the second insertion part (31) are all frustoconical in shape, and the shapes of the first insertion slot and the second insertion slot are matched with the frustocones.

8. The tibial prosthesis of claim 6 wherein, Each first insertion part (21) and the second insertion part (31) are all cylindrical in shape, and the shapes of the first insertion slot and the second insertion slot are matched with the cylinders.

9. A tibial prosthesis according to any of claims 6-8, wherein, Each first insertion part (21) is integrally formed with the tibial prosthesis connecting section (2), and the second insertion part (31) is integrally formed with the medullary cavity insertion section (3).

10. The tibial prosthesis of claim 6 wherein, The first slot is arranged in the middle of the bottom of the tibial prosthesis (1), and the two ends of the first slot are further provided with first positioning slots; each first plug-in part (21) is arranged in the middle of the top of the tibial prosthesis connecting segment (2), and the two ends of each first plug-in part (21) are further provided with first positioning parts; each second slot is arranged in the middle of the bottom of the tibial prosthesis connecting segment (2), and the two ends of each second slot are further provided with second positioning slots; the plug-in angle between a plurality of tibial prosthesis connecting segments (2) is effectively limited under the cooperation of the first positioning parts and the second positioning slots; the second plug-in part (31) is arranged in the middle of the top of the intramedullary insertion segment (3), and the two ends of the second plug-in part (31) are further provided with second positioning parts. The plug-in angle of the tibial prosthesis connecting segment (2) at the top and the tibial prosthesis (1) is effectively limited under the cooperation of the first positioning parts and the first positioning slots; the plug-in angle of the tibial prosthesis connecting segment (2) at the bottom and the intramedullary insertion segment (3) is effectively limited under the cooperation of the second positioning parts and the second positioning slots.

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