Hip joint prosthesis

Abstract

The invention relates to a hip joint prosthesis. The hip joint prosthesis comprises an interstitial acetabular prosthesis and a femoral head reconstruction device. The interstitial acetabular prosthesis is stably connected with a pelvic acetabular fossa through the interstitial acetabular cup, the fixing screw and the interstitial acetabular lining, and adaptability and stability are enhanced through multiple designs such as petal openings and damping parts; the femoral head reconstruction device comprises a joint friction surface prosthesis and a bone ingrowth supporting cage frame, and reconstruction and stable supporting of the femoral head are achieved. According to the hip joint prosthesis, the technical effects of improving the stability and durability of the hip joint prosthesis, reducing postoperative discomfort of a patient and promoting bone tissue growth are achieved.

Description

Technical Field

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

[0002] As an important technique in the modern orthopedic field, hip replacement surgery has been widely used to relieve joint pain and restore joint function. With the continuous progress of technology, the design and materials of hip prostheses have been continuously optimized, significantly improving the quality of life of patients. However, despite the great success of hip replacement surgery, it still faces many challenges in clinical applications, especially in terms of the service life of the prosthesis, postoperative complications, and adaptability to young patients. These problems have prompted researchers to continuously explore safer and more effective hip reconstruction solutions.

[0003] Currently, to solve the problems in hip replacement, the industry generally adopts total hip replacement or surface hip replacement. Total hip replacement restores joint function by completely replacing the femoral head and acetabulum, while surface hip replacement retains the femoral head and only replaces the surface of the acetabulum. In addition, some improvement solutions include using highly wear-resistant materials, optimizing the prosthesis design, and introducing bioactive coatings, etc., to improve the durability and biocompatibility of the prosthesis. These methods have improved the effect of hip replacement to a certain extent, but still have not completely solved problems such as prosthesis loosening, infection, and femoral head necrosis.

[0004] In the prior art, whether it is total hip replacement or surface hip replacement, it inevitably causes damage to the structure of the femoral head or acetabulum, resulting in problems such as postoperative muscle weakness, ligament injury, and femoral head stress shielding. Especially for young patients, such surgeries may require multiple revisions, increasing the pain and economic burden on patients. Therefore, how to effectively reconstruct the hip joint while retaining the femoral head and its surrounding soft tissues has become a technical problem to be solved urgently. Summary of the Invention

[0005] In order to overcome the above technical problems, this application provides a hip prosthesis and a femoral head reconstruction method.

[0006] The hip prosthesis provided by this application adopts the following technical solution: A hip prosthesis is disposed between the femoral head and the pelvic acetabular fossa of the human body and includes: The interposed acetabular prosthesis is disposed adjacent to the acetabular fossa of the pelvis and includes an interposed acetabular cup that fits against the acetabular fossa of the pelvis, interposed acetabular fixation screws, and an interposed acetabular liner disposed on a side of the interposed acetabular cup away from the acetabular fossa of the pelvis. The interposed acetabular cup is provided with mounting holes, and the interposed acetabular fixation screws pass through the mounting holes and are fixedly connected to the acetabular fossa of the pelvis to fix the interposed acetabular cup. A tapered mounting post is provided at the top of the interposed acetabular liner, and a mounting groove for mating with the mounting post is provided at the top inside the interposed acetabular cup. The mounting post and the mounting groove are cooperatively mounted to connect the interposed acetabular liner and the interposed acetabular cup; The femoral head reconstruction device is disposed between the interposed acetabular prosthesis and the femoral head and is slidably connected to the interposed acetabular liner, and includes an articular friction surface prosthesis and a bone ingrowth support cage, and the bone ingrowth support cage is inserted into the femoral head.

[0007] By adopting the above technical solution, the interposed acetabular prosthesis can closely fit the acetabular fossa of the pelvis. Among them, the interposed acetabular cup cooperates with the interposed acetabular fixation screws through the provided mounting holes to achieve a stable connection. The interposed acetabular fixation screws pass through the mounting holes and are fixed deep into the acetabular fossa to ensure that the interposed acetabular cup will not be displaced. The interposed acetabular liner is cooperatively mounted with the mounting groove at the top inside the interposed acetabular cup through the tapered mounting post at the top, further enhancing the structural stability. The femoral head reconstruction device is disposed between the interposed acetabular prosthesis and the femoral head, and the articular friction surface prosthesis is slidably connected to the interposed acetabular liner, ensuring the flexibility of movement. The bone ingrowth support cage is inserted into the femoral head, providing strong support for the femoral head, reducing the pressure on the femoral head, and at the same time promoting the growth of new bone. This design avoids the complete removal of the femoral head in traditional total hip arthroplasty, retains the femoral head and its surrounding soft tissues, reduces the risk of postoperative muscle weakness and ligament injury. The interposed acetabular prosthesis and the femoral head reconstruction device work together, not only achieving effective reconstruction of the hip joint, but also maximizing the integrity of the femoral head, helping to maintain the stability and function of the hip joint, reducing the occurrence of postoperative complications, and improving the quality of life of patients.

[0008] Preferably, both the interposed acetabular cup and the interposed acetabular liner are provided with acetabular ligament protection areas, artificial ligaments are provided in the ligament protection areas, and the artificial ligaments are wrapped around the acetabular ligament protection areas; The filaments of the artificial ligament are made of three elastic cores with different pitches; The interposed acetabular cup is further provided with a plurality of petal openings, and the interposed acetabular cup realizes elliptical deformation through the petal openings.

[0009] By adopting the above technical solutions, the artificial ligament is wrapped around the acetabular ligament protection area, which can effectively protect the ligament from the impact of the metal acetabular cup and reduce the discomfort of the patient. The silk thread of the artificial ligament is made of cores with three different pitches, which can achieve free bending greater than 90 degrees, further improving the flexibility and adaptability of the ligament protection area. In addition, the interposed acetabular cup is provided with a plurality of petal openings, enabling it to achieve elliptical deformation, so as to better fit the irregular elliptical structure in the acetabular fossa and enhance the stability and fixation effect of the prosthesis.

[0010] Preferably, a shock absorber is further provided between the interposed acetabular cup and the interposed acetabular liner. The shock absorber includes a first guiding column provided on the inner surface of the interposed acetabular cup, a second guiding column provided on the outer surface of the interposed acetabular liner and arranged opposite to the first guiding column, and a titanium alloy flexible spring provided between the first guiding column and the second guiding column. The first guiding column is a tube body and sleeved outside the second guiding column. The titanium alloy flexible spring is located inside the first guiding column, with one end abutted against the inner side of the interposed acetabular cup and the other end abutted against the end of the second guiding column.

[0011] By adopting the above technical solutions, the setting of the shock absorber can effectively buffer the vibration between the acetabular liner and the acetabular cup, protecting the hip joint structure from impact damage. Specifically, the cooperative design of the first guiding column and the second guiding column ensures the relative movement stability between the acetabular liner and the acetabular cup, while the titanium alloy flexible spring converts the vibration energy into physical stimulation to the acetabular fossa, promoting blood circulation and reducing the risk of osteonecrosis. In addition, this structure can also adapt to the multi-directional force transmission requirements during hip joint activities, enhancing the overall stability and durability of the prosthesis.

[0012] Preferably, the side of the interposed acetabular liner away from the interposed acetabular cup is an inner spherical surface, and the roughness of the inner spherical surface is not greater than Ra0.5.

[0013] By adopting the above technical solutions, the roughness of the inner spherical surface not being greater than Ra0.5 can effectively reduce the wear between the inner spherical surface and the femoral head reconstruction device, improve the durability of the hip joint prosthesis, and ensure the smoothness during hip joint movement, reducing the discomfort and potential damage caused by friction.

[0014] Preferably, barbed columns are provided on the outer surface of the interposed acetabular cup, and the barbed columns are introduced into the acetabular fossa.

[0015] By adopting the above technical solutions, the barbed columns can penetrate deep into the acetabular fossa, significantly enhancing the fixation effect between the interposed acetabular cup and the acetabular fossa, effectively preventing the interposed acetabular cup from shifting or loosening during use, thus ensuring the stability of the hip joint prosthesis and providing a more reliable support and a more comfortable use experience for the patient.

[0016] Preferably, three intermediate acetabular fixation screws are provided. The intermediate acetabular fixation screw includes a drill bit section, a chip removal section connected to the drill bit section, a thread section provided at the other end of the chip removal section, and a pressing section provided at the other end of the thread section. The pressing section is conical; a spherical structure is provided at the other end of the pressing section, and the spherical structure is located inside the intermediate acetabular cup, and the remaining structure passes through the mounting hole of the intermediate acetabular cup and is fixed in the acetabular fossa.

[0017] By adopting the above technical solution, the drill bit section of the intermediate acetabular fixation screw can directly drill holes, reducing the implantation steps. The chip removal section facilitates the discharge of bone chips generated during drilling, ensuring a smooth implantation process. The combined design of the thread section and the conical pressing section not only improves the stability of the screw during implantation but also can correct the reverse stress released by the human body, achieving secondary pressing and effectively preventing screw loosening. The spherical structure enables the screw to rotate 360 degrees inside the intermediate acetabular cup, enhancing the adjustment ability of the screw and improving the adaptability and stability of the overall structure.

[0018] Preferably, the thread section includes a fine thread section connected to the chip removal section and a coarse thread section connected to the fine thread section.

[0019] By adopting the above technical solution, the pitch of the fine thread section is relatively short, which is easier to enter and has good stability when first implanted into the bone. The pitch of the coarse thread section is relatively long. Since the front end has been stably inserted, it is easier to implant the latter part with less effort. The use of the coarse thread section and the fine thread section can prevent the screw from loosening after implantation.

[0020] Preferably, the joint friction surface prosthesis is made of ceramic material, and the joint friction surface prosthesis is provided with a ligament passing area corresponding to the acetabular ligament protection area; The bone ingrowth support cage includes a central fixing ring, femoral head support structures are circumferentially arranged on the central fixing ring, the femoral head support structures are inserted into the femoral head, the femoral head support structures are in the shape of sharp knives, and the surfaces are coated with tantalum coatings; A second ligament protection area is provided between the femoral head support structures; A plurality of soft spring fixing columns are provided on the side of the central fixing ring away from the femoral head, and the soft spring fixing columns are connected to the joint friction surface prosthesis; A central hole is provided at the middle position of the central fixing ring, and bone mass and / or an artificial ligament is introduced into the central hole, and the artificial ligament is fixed; A central fixing column is provided on the side of the central fixing ring close to the femoral head, and threads are provided on the outer side of the central fixing column, and the central fixing column is fixed to the femoral head through the threads.

[0021] By adopting the above technical solutions, the joint friction surface prosthesis made of ceramic material can provide excellent wear resistance, ensuring the stability and reliability of the hip joint during long-term use. A ligament passing area corresponding to the acetabular ligament protection area is opened, effectively protecting the ligament structure, reducing the damage to the ligament during the operation, thereby reducing the postoperative discomfort and promoting the recovery of joint function. The femoral head support structure circumferentially arranged on the central fixing ring of the bone ingrowth support cage is in the shape of a sharp knife and coated with a tantalum coating, which can enhance the fixing effect, promote the attachment and proliferation of bone cells at the same time, and improve the bone integration ability. The second ligament protection area opened between the femoral head support structures further protects the ligament and avoids additional damage to it during the operation. The multiple soft spring fixing posts on the central fixing ring are connected to the joint friction surface prosthesis, and by continuously applying stress to stimulate bone regeneration, the problem of bone necrosis caused by stress shielding is effectively avoided. The design of the central hole allows the filling of bone mass or the introduction of artificial ligaments, enhancing the adaptability and functionality of the device. Threads are provided on the outer side of the central fixing post and fixed to the femoral head to ensure the stability of the device and the long-term use effect.

[0022] Preferably, the central fixing post is arranged in a conical shape, a 3D printed trabecular bone structure is arranged at the end of the central fixing post far from the central fixing ring, and the inner diameter of the thread is arranged in a rough and porous shape.

[0023] By adopting the above technical solutions, setting the central fixing post in a conical shape can facilitate its insertion into the femoral head, reduce the resistance during the implantation process, and improve the fixing stability at the same time. The rough and porous shape arranged on the inner side of the central fixing post, this design mimics the structural characteristics of natural trabecular bone, can significantly promote the attachment and proliferation of bone cells, thereby realizing the ingrowth of bone tissue inward, enhancing the long-term stability between the prosthesis and the femoral head, effectively preventing the loosening of the prosthesis, and prolonging the service life of the prosthesis. 3D printed trabecular bone structure In summary, the present application includes at least one of the following beneficial technical effects: 1. By retaining the femoral head ligament and setting the acetabular ligament protection area, in cooperation with the artificial ligament protection structure, the ligament injury is effectively reduced, the stability of the hip joint is maintained, and the problems of postoperative muscle weakness and atrophy are avoided; 2. The combination of the interposed acetabular prosthesis and the femoral head reconstruction device, by using the bone ingrowth support cage and the central fixing post design, promotes the bone regeneration inside the femoral head, enhances the bone strength, reduces the stress shielding effect at the same time, and prolongs the service life of the prosthesis; 3. The design of the shock absorber can buffer the vibration between the acetabular liner and the acetabular cup, conduct the vibration force to the acetabular fossa, strengthen the physical stimulation, promote blood circulation, reduce the risk of bone necrosis, and improve the postoperative comfort of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a hip joint prosthesis of the present application.

[0025] Figure 2 Schematic diagram of the interposed acetabular cup structure Figure 1 。

[0026] Figure 3 Schematic diagram of the interposed acetabular cup structure Figure 2 。

[0027] Figure 4 Schematic diagram of the interposed acetabular liner structure Figure 1 。

[0028] Figure 5 Schematic diagram of the interposed acetabular liner structure Figure 2 。

[0029] Figure 6 Schematic diagram of the interposed acetabular fixation screw structure.

[0030] Figure 7 Schematic diagram of the femoral head reconstruction device structure.

[0031] Figure 8 Schematic diagram of the joint friction surface prosthesis structure.

[0032] Figure 9 Schematic diagram of the bone ingrowth support cage structure.

[0033] Figure 10 Schematic diagram of the central fixation column structure.

[0034] Figure 11 Schematic diagram of the artificial ligament silk structure.

[0035] Figure 12 Is Figure 11 Cross-sectional view of.

[0036] Figure 13 Schematic diagram of the artificial ligament structure.

[0037] Description of reference numerals: 1. Interposed acetabular prosthesis; 11. Interposed acetabular cup; 111. Mounting hole; 112. Mounting groove; 113. Petal opening; 114. Barbed column; 12. Interposed acetabular fixation screw; 121. Drill bit section; 122. Chip removal section; 123. Thread section; 1231. Fine thread section; 1232. Coarse thread section; 124. Pressurization section; 125. Spherical structure; 13. Interposed acetabular liner; 131. Mounting post; 14. Acetabular ligament protection area; 141. Artificial ligament; 15. Shock absorber; 151. First guide post; 152. Second guide post; 153. Titanium alloy flexible spring; 2. Femoral head reconstruction device; 21. Articular friction surface prosthesis; 211. Ligament passing area; 22. Bone ingrowth support cage; 221. Central fixation ring; 222. Femoral head support structure; 223. Second ligament protection area; 224. Soft spring fixing post; 225. Central hole; 226. Central fixing post; 2261. 3D printed trabecular bone; 3. Acetabular fossa; 4. Femoral head. Detailed implementation manners

[0038] The following further elaborates on this application in conjunction with the attached Figure 1-13 drawings.

[0039] An embodiment of this application discloses a hip joint prosthesis. Referring to Figure 1 , the hip joint prosthesis includes an interposed acetabular prosthesis 1 and a femoral head reconstruction device 2. The interposed acetabular prosthesis 1 is attached to the pelvic acetabular fossa 3 and fixed by fixation screws. The femoral head reconstruction device 2 is located between the interposed acetabular prosthesis 1 and the femoral head 4 and is slidably connected thereto, achieving the effect of realizing hip joint stability and function recovery by retaining the femoral head 4 and ligaments.

[0040] Referring to Figures 2-5 , specifically, the interposed acetabular prosthesis 1 includes an interposed acetabular cup 11, an interposed acetabular fixation screw 12, and an interposed acetabular liner 13. The interposed acetabular cup 11 is provided with a mounting hole 111. The interposed acetabular fixation screw 12 passes through the mounting hole 111 and is fixedly connected to the pelvic acetabular fossa 3 to fix the interposed acetabular cup 11. A tapered mounting post 131 is provided at the top of the interposed acetabular liner 13. An installation groove 112 for mating with the mounting post 131 is provided at the inner top of the interposed acetabular cup 11. The mounting post 131 and the mounting groove 112 are cooperatively installed to connect the interposed acetabular liner 13 and the interposed acetabular cup 11. A cross groove is provided at the top of the mounting post 131 to facilitate the installation of the mounting post 131 into the mounting groove 112. The femoral head reconstruction device 2 includes an articular friction surface prosthesis 21 and a bone ingrowth support cage 22, and the bone ingrowth support cage 22 is inserted into the femoral head 4.

[0041] Referring to Figures 11-13, both the intermediate acetabular cup 11 and the intermediate acetabular liner 13 are provided with an acetabular ligament protection area 14. An artificial ligament 141 is arranged in the acetabular ligament protection area 14, and the artificial ligament 141 is wrapped around the acetabular ligament protection area 14. The silk thread of the artificial ligament 141 is made of elastic cores with three different pitches, and can achieve free bending of more than 90 degrees. The intermediate acetabular cup 11 is also provided with a plurality of petal openings 113, and elliptical deformation is realized through the petal openings 113, which fits the pelvic acetabular fossa 3 better. The artificial ligament 141 can be made of materials such as nylon and polyester fiber.

[0042] Refer to Figure 3 , Figure 4 , a shock absorber 15 is arranged between the intermediate acetabular cup 11 and the intermediate acetabular liner 13. The shock absorber 15 includes a first guide post 151 arranged on the inner surface of the intermediate acetabular cup 11, a second guide post 152 arranged on the outer surface of the intermediate acetabular liner 13 and opposite to the first guide post 151, and a titanium alloy flexible spring 153 arranged between the first guide post 151 and the second guide post 152. The first guide post 151 is a tubular body and sleeved on the outer side of the second guide post 152. The titanium alloy flexible spring 153 is located inside the first guide post 151, with one end abutted against the inner side of the intermediate acetabular cup 11 and the other end abutted against the end of the second guide post 152. The titanium alloy flexible spring 153 can be selected with different hardness grades to meet the needs of different patients. The arrangement of the shock absorber 15 can effectively buffer the vibration between the acetabular liner and the acetabular cup, protecting the hip joint structure from impact damage. At the same time, the titanium alloy flexible spring 153 converts the vibration energy into physical stimulation to the acetabular fossa 3, promoting blood circulation and reducing the risk of osteonecrosis.

[0043] Refer to Figure 5 , the side of the intermediate acetabular liner 13 away from the intermediate acetabular cup 11 is an inner spherical surface, and the surface roughness of the inner spherical surface is not greater than Ra0.5. The inner spherical surface can be polished to reduce the friction with the femoral head reconstruction device 2.

[0044] Refer to Figure 2 , barbs 114 are arranged on the outer surface of the intermediate acetabular cup 11, and the barbs 114 are led into the acetabular fossa 3. The barbs 114 can be made of stainless steel or titanium alloy materials to increase the contact area with the acetabular fossa 3.

[0045] Refer to Figure 6, three intermediate acetabular fixing screws 12 are provided. The intermediate acetabular fixing screw 12 includes a drill bit section 121, a chip removal section 122 connected to the drill bit section 121, a thread section 123 provided at the other end of the chip removal section 122, and a pressing section 124 provided at the other end of the thread section 123. The pressing section 124 is conical; a spherical structure 125 is provided at the other end of the pressing section 124. The spherical structure 125 is located inside the intermediate acetabular cup 11, and the rest of the structure passes through the mounting hole 111 of the intermediate acetabular cup 11 and is fixed in the acetabular fossa 3. The drill bit section 121 can be made of cemented carbide material to improve the drilling efficiency. The chip removal section 122 can be designed in a spiral shape to facilitate the discharge of bone chips.

[0046] The thread section 123 includes a fine thread section 1231 connected to the chip removal section 122 and a coarse thread section 1232 connected to the fine thread section 1231. The fine thread section 1231 has a shorter pitch and is relatively easy to enter and has good stability when first implanted into the bone. The coarse thread section 1232 has a longer pitch. Since the front end has already been stably inserted, it can be implanted with less effort later. The use of the coarse thread section 1232 and the fine thread section 1231 can prevent the screw from loosening after implantation.

[0047] Refer to Figure 7 、 Figure 8 , the joint friction surface prosthesis 21 is made of ceramic material, and the joint friction surface prosthesis 21 is provided with a ligament passing area 211 corresponding to the acetabular ligament protection area 14.

[0048] Refer to Figure 7 、 Figure 9 , the bone ingrowth support cage 22 includes a central fixing ring 221. The central fixing ring 221 is circumferentially provided with femoral head support structures 222. The femoral head support structures 222 are inserted into the femoral head 4. The femoral head support structures 222 are in the shape of sharp knives and are coated with a tantalum coating on the surface. A second ligament protection area 223 is provided between the femoral head support structures 222. A plurality of soft spring fixing columns 224 are provided on the side of the central fixing ring 221 away from the femoral head 4. The soft spring fixing columns 224 are connected to the joint friction surface prosthesis 21. A central hole 225 is provided at the middle position of the central fixing ring 221. Bone mass and / or an artificial ligament 141 is introduced into the central hole 225 and the artificial ligament 141 is fixed. A central fixing column 226 is provided on the side of the central fixing ring 221 close to the femoral head 4. Threads are provided on the outside of the central fixing column 226 and it is fixed to the femoral head 4 through the threads. The central fixing column 226 can adopt trapezoidal threads to improve the fixing strength.

[0049] Refer to Figure 10, the central fixing post 226 is conical in shape, and a rough and porous morphology is provided on the inner side of the threaded inner diameter of the central fixing post 226. This design mimics the structural characteristics of natural trabecular bone, which can significantly promote the attachment and proliferation of bone cells, thereby achieving the in-growth of bone tissue, enhancing the long-term stability between the prosthesis and the femoral head 4, effectively preventing prosthesis loosening, and extending the service life of the prosthesis. A 3D printed trabecular bone 2261 structure is provided at the top of the central fixing post 226. The 3D printed trabecular bone 2261 structure can be made of hydroxyapatite material to promote bone integration.

[0050] The implementation principle of a hip joint prosthesis in an embodiment of the present application is as follows: By retaining the femoral head 4 and ligaments, and combining the interposed acetabular prosthesis 1 and the femoral head reconstruction device 2, the stability and function restoration of the hip joint are achieved. The design of the interposed acetabular prosthesis 1 ensures the integrity of the acetabular fossa 3 structure, and the femoral head reconstruction device 2 promotes bone regeneration through physical stimulation. Finally, most of the prosthesis is removed to restore the original function of the hip joint. This design not only retains the important load-bearing relationship but also reduces the occurrence of postoperative complications and improves the quality of life of patients.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A hip joint prosthesis is disposed between the femoral head (4) and the pelvic acetabular fossa (3) of the human body, and is characterized in that Comprising: An intermediate acetabular prosthesis (1), disposed adjacent to the pelvic acetabular fossa (3), including an intermediate acetabular cup (11) that fits against the pelvic acetabular fossa (3) and intermediate acetabular fixation screws (12), and an intermediate acetabular liner (13) disposed on a side of the intermediate acetabular cup (11) away from the pelvic acetabular fossa (3). The intermediate acetabular cup (11) is provided with a mounting hole (111), and the intermediate acetabular fixation screw (12) passes through the mounting hole (111) and is fixedly connected to the pelvic acetabular fossa (3) to fix the intermediate acetabular cup (11). A conical mounting post (131) is provided at the top of the intermediate acetabular liner (13), and a mounting groove (112) for mating with the mounting post (131) is formed at the top inside the intermediate acetabular cup (11). The mounting post (131) and the mounting groove (112) are cooperatively mounted to connect the intermediate acetabular liner (13) and the intermediate acetabular cup (11). A femoral head reconstruction device (2), disposed between the intermediate acetabular prosthesis (1) and the femoral head (4) and slidably connected to the intermediate acetabular liner (13), including an articular friction surface prosthesis (21) and a bone ingrowth support cage (22), and the bone ingrowth support cage (22) is inserted into the femoral head (4).

2. The hip joint prosthesis according to claim 1, wherein: Both the intermediate acetabular cup (11) and the intermediate acetabular liner (13) are provided with acetabular ligament protection areas (14), and an artificial ligament (141) is provided in the ligament protection area. The artificial ligament (141) is wrapped around the acetabular ligament protection area (14). The filaments of the artificial ligament (141) are made of elastic cores with three different pitches. The intermediate acetabular cup (11) is further provided with a plurality of petal openings (113), and the intermediate acetabular cup (11) realizes elliptical deformation through the petal openings (113).

3. The hip joint prosthesis according to claim 2, characterized in that: A shock absorber (15) is further disposed between the intermediate acetabular cup (11) and the intermediate acetabular liner (13). The shock absorber (15) includes a first guiding post (151) disposed on the inner surface of the intermediate acetabular cup (11), a second guiding post (152) disposed on the outer surface of the intermediate acetabular liner (13) opposite to the first guiding post (151), and a titanium alloy flexible spring (153) disposed between the first guiding post (151) and the second guiding post (152). The first guiding post (151) is a tubular body and is sleeved outside the second guiding post (152). The titanium alloy flexible spring (153) is located inside the first guiding post (151), with one end abutted against the inner side of the intermediate acetabular cup (11) and the other end abutted against the end of the second guiding post (152).

4. The hip joint prosthesis according to claim 3, characterized in that: The side of the intermediate acetabular liner (13) away from the intermediate acetabular cup (1,1) is an inner spherical surface, and the roughness of the inner spherical surface is not greater than Ra0.

5.

5. The hip joint prosthesis according to claim 4, characterized in that: Barbs (114) are provided on the outer surface of the intermediate acetabular cup (11), and the barbs (114) are inserted into the acetabular fossa (3).

6. The hip joint prosthesis according to claim 5, characterized in that: There are three interposed acetabular fixation screws (12). The interposed acetabular fixation screw (12) includes a drill bit section (121), a chip removal section (122) connected to the drill bit section (121), a threaded section (123) provided at the other end of the chip removal section (122), and a pressing section (124) provided at the other end of the threaded section (123). The pressing section (124) is conical; a spherical structure (125) is provided at the other end of the pressing section (124), and the spherical structure (125) is located inside the interposed acetabular cup (11), and the rest of the structure passes through the mounting hole (111) of the interposed acetabular cup (11) and is fixed in the acetabular fossa (3).

7. The hip joint prosthesis according to claim 6, wherein: The threaded section (123) includes a fine threaded section (1231) connected to the chip removal section (122) and a coarse threaded section (1232) connected to the fine threaded section (1231).

8. The hip joint prosthesis according to claim 1, characterized in that: The joint friction surface prosthesis (21) is made of ceramic material, and the joint friction surface prosthesis (21) is provided with a ligament passing area (211) corresponding to the acetabular ligament protection area (14). The bone ingrowth support cage (22) includes a central fixing ring (221). The central fixing ring (221) is circumferentially provided with femoral head support structures (222). The femoral head support structures (222) are inserted into the femoral head (4). The femoral head support structures (222) are in the shape of sharp knives and are coated with a tantalum coating on the surface. A second ligament protection area (223) is provided between the femoral head support structures (222). A plurality of soft spring fixing columns (224) are provided on the side of the central fixing ring (221) away from the femoral head (4), and the soft spring fixing columns (224) are connected to the joint friction surface prosthesis (21). A central hole (225) is provided at the middle position of the central fixing ring (221). Bone mass is filled in the central hole (225) and / or the artificial ligament (141) is introduced into the central hole (225), and the artificial ligament (141) is fixed. A central fixing column (226) is provided on the side of the central fixing ring (221) close to the femoral head (4). Threads are provided on the outside of the central fixing column (226), and the central fixing column (226) is fixed to the femoral head (4) through the threads.

9. The hip joint prosthesis according to claim 8, characterized in that: The central fixing column (226) is conical. A 3D printed trabecular bone (2261) structure is provided at the end of the central fixing column (226) away from the central fixing ring (221), and the inner diameter of the thread is provided with a rough and porous shape.

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