Femoral trochanter patch system

Abstract

The invention relates to the field of medical instruments, in particular to a femoral trochanter patch system. The femoral component prosthesis comprises a femoral component prosthesis inserted into a femur and a patch prosthesis detachably connected to the upper end of the femoral component prosthesis, the patch prosthesis has the appearance matched with the proximal tuberosity part of the femur, an inner support is arranged in the patch prosthesis, the surface of the inner support is sequentially provided with a buffer layer and a bone trabecula structural layer from inside to outside, an elastic stimulation unit is arranged in the buffer layer, and the elastic stimulation unit is connected with the patch prosthesis. The bone trabecula structural layer is used for bone ingrowth, and the patch prosthesis has various designs such as an arch structure and an assembled structure and is connected with the femoral stem prosthesis through a multi-dimensional intramedullary fixing structure. The technical effects that the patch prosthesis is better matched with the femur, bone ingrowth is facilitated, stress is dispersed, installation and replacement are convenient, and internal and external freedom degree locking is achieved are achieved.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a femoral trochanteric patch system. Background Technology

[0002] With the increasing popularity and rapid development of hip replacement surgery, the number of revision replacement cases is showing a year-on-year upward trend. Hip replacement surgery plays a crucial role in improving patients' joint function and quality of life, and is of great significance in the field of orthopedics. However, many patients face numerous problems during the replacement process, such as osteolysis, periprosthetic fractures and infections, and aseptic loosening. These problems lead to extensive bone loss in the proximal femur, especially in the greater trochanter area. Even in patients undergoing primary replacement, bone calcium loss is present, and most elderly patients have varying degrees of osteoporosis in the proximal femur and greater trochanter area. These conditions all pose challenges to hip replacement surgery, affecting surgical outcomes and patient recovery.

[0003] In the field of hip replacement surgery, various methods are commonly used to address similar problems. For femoral medullary canal fixation, there are well-established solutions for different types of bone defects, such as integral conical ridged femoral stem prostheses, split femoral stem prostheses, and modular femoral stem prostheses. For problems at the greater trochanter of the femoral bone outside the medullary canal, commonly used methods for enhanced fixation include: first, adding a trochanteric claw to the lateral aspect of the femur, connecting it to the femoral stem prosthesis via trochanteric fixation screws or securing it with titanium cables; second, sharpening the lateral shoulder area of ​​the femoral stem prosthesis near the greater trochanter to create a wedge shape at different angles to match the prosthesis.

[0004] Existing technologies have significant drawbacks. Adding a trochanteric claw to the lateral femur and connecting or binding titanium cables involves complex procedures, requires specialized instruments, and is highly difficult. Patients with severe osteolysis or bone defects cannot withstand the binding force of the titanium cables, leading to breakage. Furthermore, these methods cannot address hollowing issues caused by osteolysis, osteoporosis, or fractures. The method of sharpening and matching a wedge-shaped prosthesis with a wedge-shaped patch has poor compatibility, reduces surgical flexibility, requires a specially made femoral stem prosthesis, and the wedge-shaped insertion lacks anti-rotation measures, making it prone to loosening. Additionally, the small contact area between the wedge-shaped patch and the trochanteric region fails to adequately fill the defect. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides a femoral trochanteric patch system, which can better fit the patch prosthesis to the femur, facilitate bone ingrowth, disperse stress, facilitate installation and replacement, and achieve technical effects such as locking of internal and external degrees of freedom.

[0006] This application is achieved through the following technical solution: A femoral trochanteric patch system includes a femoral stem prosthesis that can be inserted into the human femur and a patch prosthesis detachably connected to the upper end of the femoral stem prosthesis. The patch prosthesis has a shape adapted to the proximal trochanteric region of the femur, and an internal support is disposed inside the patch prosthesis. The back of the internal support away from the femoral stem prosthesis is covered with a buffer layer and a bone ingrowth interface layer from the inside to the outside. An elastic stimulation unit is embedded in the buffer layer. The elastic stimulation unit can transmit elastic restoring force to the bone ingrowth interface layer. The bone ingrowth interface layer is used for bone tissue growth and attachment.

[0007] By adopting the above technical solution, the shape of the prosthesis is adapted to the proximal trochanter of the femur, which can fully fill the bone defect in this area and fundamentally solve the problem of bone defect. The internal bone ingrowth interface layer and buffer layer play important roles. The bone ingrowth interface layer provides favorable conditions for bone ingrowth, which is conducive to bone ingrowth and nutrient exchange, and can effectively improve the bone ingrowth rate at the interface between the prosthesis and the host bone fragments, ensuring the long-term fixation of the prosthesis. The elastic stimulation unit in the buffer layer deforms when the prosthesis is subjected to force, thereby generating elastic recovery force. This elastic recovery force acts on the bone ingrowth interface layer, so that the bone tissue receives more mechanical stimulation during the rehabilitation process and accelerates bone ingrowth. This structural design can also disperse and transmit pressure when the prosthesis is subjected to external pressure, which strengthens the robustness of the prosthesis and provides an effective solution for different degrees of bone defects in the proximal trochanter of the femur in hip replacement, especially revision hip replacement.

[0008] Optionally, the internal stent has a three-dimensional through-hole network, the buffer layer is an elastic material layer disposed between the internal stent and the bone ingrowth interface layer, and the elastic stimulation unit is an elastic element embedded in the buffer layer.

[0009] By adopting the above technical solution, the internal scaffold has a three-dimensional through-hole network, presenting a topological structure composed of repeating cubic units arrayed in three dimensions. Each cubic unit is connected to its six adjacent units by connecting ribs. A buffer layer is applied to the surface, and elastic elements embedded in the buffer layer serve as elastic stimulation units, effectively reducing the stiffness of the patch and lightening its weight. Due to the reduced patch stiffness, the stress shielding phenomenon in the proximal femur caused by the stiffness of the prosthesis or fixation material being much higher than that of bone tissue can be reduced. Stress shielding can significantly reduce the stress that bone tissue can withstand, leading to problems such as bone resorption, osteoporosis, and prosthesis loosening. This design can avoid these situations. The elastic elements embedded in the buffer layer deform when the prosthesis is under stress and transmit elastic force to the bone ingrowth interface layer, providing more mechanical stimulation to the bone tissue during rehabilitation, promoting bone ingrowth, accelerating bone integration, and contributing to the long-term fixation of the prosthesis. Moreover, this topological structure can be realized through 3D printing technology, which can precisely embed elastic elements in the small grids of the buffer layer, creating favorable conditions for bone ingrowth.

[0010] Optionally, the shape of the prosthetic patch incorporates an arched structure formed by a curvature transition, which disperses stress when subjected to external pressure.

[0011] By adopting the above technical solution, the shape of the patch prosthesis, combined with the curvature transition, forms an arched structure, which has significant advantages. When subjected to external pressure, it can transfer the pressure downward and outward to adjacent parts, distributing the force to different stress points. Compared with objects with a single-sided stress shape, the arched prosthesis can withstand greater forces, and its curved surface structure can effectively disperse the pressure, greatly enhancing the robustness of the prosthesis. In addition, the patch prosthesis can be made in different thicknesses, fundamentally solving the problem of bone defects. Furthermore, it can be delivered as a whole or in modular form. In particular, the modular form allows for the selection of components of different thicknesses and appropriate specifications for assembly, connection, and implantation according to the defect conditions of different cases, resulting in a higher degree of fit and providing precise solutions for different cases.

[0012] Optionally, the prosthesis is an assembled structure, including an upper bionic trochanter located at the top and a lower connecting support portion connected to the femoral stem prosthesis. The upper bionic trochanter and the connecting support portion are detachably connected.

[0013] By adopting the above technical solution, the prosthesis adopts an assembled structure. The upper bionic trochanter and the connecting support are detachably connected. The upper and lower parts have different thicknesses and specifications. Before implantation, according to the defects of the upper and lower parts, different thicknesses and suitable specifications can be found by trial molding before the prosthesis is assembled, connected and implanted. The fit is higher and can provide precise solutions for different cases.

[0014] Optionally, the assembly surfaces of the upper biomimetic ridge and the connecting support are L-shaped, including a vertical assembly surface and a horizontal assembly surface; the vertical assembly surface of the upper biomimetic ridge is provided with a dovetail tenon, and the vertical assembly surface of the connecting support is provided with a connecting tenon that matches the dovetail tenon; the horizontal assembly surface of the upper biomimetic ridge is provided with a tapered self-locking groove, and the horizontal assembly surface of the connecting support is provided with a self-locking tenon that matches the tapered self-locking groove.

[0015] By adopting the above technical solution, the prosthesis is a prefabricated structure. The assembly surface of the upper biomimetic bulge and the connecting support is L-shaped. The vertical assembly surface is connected by dovetail grooves and connecting tenons, and the horizontal assembly surface is connected by tapered self-locking grooves and self-locking tenons to achieve detachable connection. Depending on the defects of the upper and lower parts, different thicknesses and suitable specifications can be found by trial molding before the prosthesis is assembled, connected and implanted, resulting in a higher fit and providing precise solutions for different cases. In addition, the concave and convex sides of the dovetail groove and the inner and outer cones of the tapered self-locking structure can be freely switched between the upper and lower parts to achieve structural flexibility.

[0016] Optionally, the bone growth interface layer includes at least one of the following: a trabecular structure layer disposed on the buffer layer, a tantalum coating, a titanium coating, a tantalum-titanium hybrid coating, an HA coating, a Ti+HA coating, or a fiber layer.

[0017] By adopting the above technical solutions, the bone ingrowth surface of the prosthesis is provided with at least one of the following: trabecular bone interface, tantalum coating interface, titanium coating interface, tantalum-titanium hybrid coating interface, HA coating, Ti+HA coating, or fiber interface. This provides doctors with a variety of choices. Doctors can select the most suitable bone ingrowth interface according to the patient's bone condition and their own needs. Among them, the trabecular bone structure layer is the preferred implementation. The trabecular bone structure layer can be designed with different proportions of powder mixture or different shapes of trabecular bone structures according to the patient's specific bone condition to design a personalized bone ingrowth interface to achieve the best match with the patient's original bone. This diverse and personalized design can better promote bone ingrowth, introduce stronger postoperative integration with the original bone, reduce prosthesis micromovement, reduce the risk of early postoperative loosening, help with long-term fixation of the prosthesis, and allow the greater trochanter to obtain the priority privilege of early bone integration, realizing bone defect regeneration and repair.

[0018] Optionally, the bone growth interface layer includes a trabecular structure layer disposed on the buffer layer; the trabecular structure layer has a three-dimensional interconnected porous mesh structure, including a trabecular lattice and a supporting mesh frame, wherein the trabecular lattice is attached to or fills the supporting mesh frame; the supporting mesh frame is composed of an elastic mesh structure.

[0019] By adopting the above technical solution, the trabecular units are placed on an elastic support frame to form a double biomimetic trabecular structure. This structure mimics the irregular porous 3D structure of human cancellous bone, optimizes mechanical properties and stress distribution, improves the bone ingrowth rate at the interface between the prosthesis and the host bone fragments, avoids the problem of insufficient support or collapse of traditional trabecular structures, and ensures the long-term fixation of the prosthesis. The support frame can be composed of elastic metal wires arranged in a double helix pattern, similar to a DNA structure. It has the ability to form an orthogonal spatial network with "circumferential tension + oblique shear", so that the core trabecular lattice is in a state of near triaxial compression, thereby improving the mechanical properties of the trabecular structure layer.

[0020] Optionally, the trabecular bone structure layer includes a dense area and a sparse area from top to bottom. Both the dense area and the sparse area are provided with squares for filling host bone fragments, and the number of squares in the dense area per unit area is greater than the number of squares in the sparse area; the squares are provided with fixing posts.

[0021] By adopting the above technical solution, the patch prosthesis is connected to the femoral stem prosthesis. Its shape is adapted to the proximal trochanter of the femur, and its internal topological structure includes a trabecular structure layer and a buffer layer. The elastic stimulation unit in the buffer layer can transmit elastic force to the trabecular structure layer when the patch prosthesis is subjected to force. The trabecular unit is used for bone ingrowth. The trabecular structure layer is divided into dense and sparse areas from top to bottom, and each area is equipped with squares to fill host bone fragments. The number of squares in the dense area is greater than that in the sparse area per unit area. The squares are equipped with fixation posts, which can realize diverse and personalized bone ingrowth interfaces and gradient bone graft designs. It disperses the interface stress at the greater trochanter, further reduces stress shielding, and uses host bone fragments to form biological fixation, reducing prosthesis micromovement, reducing the risk of early postoperative loosening, and helping the prosthesis to be fixed for a long time.

[0022] Optionally, the connection structure between the patch prosthesis and the femoral stem prosthesis is a multi-dimensional intramedullary fixation structure, including a fixation platform on the upper part of the patch prosthesis, an arc-shaped surface on the lower part of the patch prosthesis, and embracing wings on both sides of the arc-shaped surface. The fixation platform is provided with an elliptical slot, and the femoral stem prosthesis is provided with a positioning platform adapted to the fixation platform. The positioning platform is provided with a fastening threaded hole adapted to the elliptical slot. The arc-shaped surface is adapted to the curvature of the back of the femoral stem prosthesis. The embracing wings encircle the femoral stem prosthesis. The arc-shaped surface and the embracing wings are provided with grooves for locking the internal and external degrees of freedom through bio-pressure fitting or bone cement bonding.

[0023] By adopting the above technical solution, the patch prosthesis and the femoral stem prosthesis are connected by a multi-dimensional intramedullary fixation structure. The elliptical slot of the fixation platform and the fastening threaded hole of the femoral stem prosthesis positioning platform cooperate to achieve upper and lower degree of freedom locking. The curved surface is adapted to the curvature of the back of the femoral stem prosthesis, and the circumferential wings circumferentially embrace the femoral stem prosthesis. Furthermore, the grooves of the curved surface and the circumferential wings can achieve internal and external degree of freedom locking through bio-pressure fitting or bone cement bonding. Compared with extramedullary fixation, it is less invasive, easier to operate, and can achieve multi-dimensional restriction of each degree of freedom of the patch, resulting in good fixation effect.

[0024] Optionally, the fixation platform is provided with a lifting lip near the curved surface of the femoral stem prosthesis neck to avoid discomfort during assembly; the patch prosthesis also has a tendon suture hole. By adopting the above technical solutions, the lip lift can avoid discomfort during assembly, making the assembly of the patch prosthesis and the femoral stem prosthesis smoother. At the same time, the tendon suture hole can enhance the fixation effect of the patch prosthesis and improve the overall stability of the system.

[0025] In summary, this application includes at least one of the following beneficial technical effects: The prosthesis patch of this application has a shape that is adapted to the proximal trochanter of the femur, and can be designed with different thicknesses to fully fill the greater trochanter of the femur, fundamentally solving the problem of bone defects. It can also be delivered as a whole or as a modular piece depending on the defect, with a higher degree of fit, providing a precise solution for different cases. The internal structure of the prosthesis in this application is designed with a topological structure. The topological structure can reduce the stiffness of the prosthesis while reducing weight. The elastic stimulation unit in the buffer layer transmits elastic force to the trabecular structure layer when the prosthesis is under stress, so that the bone tissue can receive more mechanical stimulation, accelerate bone ingrowth, and reduce stress shielding. The patch prosthesis and femoral stem prosthesis of this application adopt a multi-dimensional intramedullary fixation method. The adjustable elliptical long slot at the top can be used to fit the thread position of femoral stem prostheses of different specifications. The front arc surface and the side wings can be bio-pressed for fixation or bonded with a small amount of bone cement and bone fragments, reducing trauma, facilitating implantation and providing good fixation effect. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the femoral trochanteric patch system described in Embodiment 1; Figure 2 This is a cross-sectional view of the femoral trochanteric patch system described in Embodiment 1, inserted into the human femur. Figure 3 This is a schematic diagram of the arrangement structure of the internal scaffold, buffer layer and bone growth interface layer described in Embodiment 1; Figure 4 This is a schematic diagram of the internal support structure described in Embodiment 1; Figure 5This is a schematic diagram of the buffer layer described in Embodiment 1; Figure 6 This is a schematic diagram of the arrangement structure of the elastic stimulation unit described in Embodiment 1; Figure 7 This is a schematic diagram of the trabecular bone structure layer described in Embodiment 1; Figure 8 This is a schematic diagram of the grid structure described in Embodiment 1; Figure 9 This is a schematic diagram of the elastic strip described in Embodiment 1; Figure 10 This is a schematic diagram of the arc-shaped surface described in Embodiment 1; Figure 11 This is a schematic diagram of the elliptical elongated slot hole described in Embodiment 1; Figure 12 This is a schematic diagram of the structure without embracing wings on both sides of the curved surface described in Embodiment 1; Figure 13 This is a schematic diagram of the structure of the embracing wings arranged on the fixed platform as described in Embodiment 1; Figure 14 This is a schematic diagram of the solid internal support structure described in Embodiment 1; Figure 15 This is a schematic diagram of the femoral trochanteric patch system described in Embodiment 2; Figure 16 This is a schematic diagram of the dovetail tenon structure described in Embodiment 2; Figure 17 This is a schematic diagram of the conical self-locking groove described in Embodiment 2; Figure 18 This is a schematic diagram of the assembly structure of the connector and the patch prosthesis described in Embodiment 3; Figure 19 This is a schematic diagram of the structure for connecting the oval hole as described in Embodiment 3.

[0027] In the diagram: 1. Femoral stem prosthesis; 11. Positioning platform; 2. Patch prosthesis; 21. Fixation platform; 211. Elliptical slot; 212. Lifting lip; 22. Tendon suture hole; 23. Internal support; 24. Buffer layer; 241. Elastic stimulation unit; 242. Receiving groove; 25. Bone ingrowth interface layer; 251. Dense area; 252. Sparse area; 253. Supporting mesh; 254. Grid; 255. Fixation post; 256. Host bone fragments; 257. Bone trabecular lattice; 26. Bionic trochanter; 261. Dovetail tenon; 262. Conical self-locking groove; 27. Connecting support; 271. Connecting tenon; 272. Self-locking tenon; 28. Curved surface; 281. Embracing wing; 29. ​​Groove; 3. Fastening bolt; 4. Human femur; 5. Connector; 51. Connecting oval hole; 52. Spike; 53. Titanium nail; 6. Binding component. Detailed Implementation

[0028] The technical solutions of various embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Example 1

[0029] Reference Figures 1 to 3 This application discloses a femoral trochanter patch system, including a femoral stem prosthesis 1 that can be inserted into the femur 4 and a patch prosthesis 2 that is detachably connected to the upper end of the femoral stem prosthesis 1. The patch prosthesis 2 has a shape adapted to the proximal trochanter of the femur. An internal support 23 is provided inside the patch prosthesis 2. The back of the internal support away from the femoral stem prosthesis 1 is covered with a buffer layer 24 and a bone ingrowth interface layer 25 from the inside to the outside. An elastic stimulation unit 241 is embedded in the buffer layer 24. The elastic stimulation unit 241 can transmit elastic restoring force to the bone ingrowth interface layer 25. The bone ingrowth interface layer 25 is used for bone tissue growth and attachment.

[0030] Specifically, refer to Figures 1 to 3 The shape of the patch prosthesis 2 incorporates an arched structure formed by a curvature transition. This arched structure disperses stress when subjected to external pressure. This arched structure is similar to the shape of an egg, which can transfer the pressure downward and outward to adjacent parts, dispersing the pressure to different stress points, thereby enhancing the robustness of the prosthesis. The patch prosthesis 2 can have different thicknesses to accommodate different degrees of bone defects.

[0031] Reference Figures 3 to 4 The internal stent 23 has a three-dimensional through-hole network and can be manufactured using 3D printing technology. It is made of titanium alloy and has a shape that is compatible with the proximal trochanter of the femur. The outer surface of the biomimetic trochanter 26 of the internal stent 23 is covered with a buffer layer 24 and a bone growth interface layer 25 from the inside to the outside. The buffer layer 24 is a solid edge-sealing flexible buffer layer laid between the internal stent 23 and the trabecular bone structure layer. As a mature existing technology, the material can be thermoplastic polyurethane / polycarbonate polyurethane, which can be 3D printed. By changing the hard segment content, the modulus can be adjusted to the range of 10~500 MPa to achieve the integral molding of the internal stent and the buffer layer.

[0032] Reference Figures 5 to 6The elastic stimulation unit 241 is an elastic element embedded in the buffer layer 24, with its two ends fixed between the buffer layer 24 and the inner support 23, respectively. It can be an elastic object such as a spring or a rubber block, and can be embedded into the buffer layer 24 using 3D printing technology. In this example, the elastic stimulation unit 241 is a spring. When the elastic stimulation unit 241 is subjected to external pressure, the spring will deform and transmit periodic micro-motion stimulation to the bone ingrowth interface layer, simulating physiological load and promoting bone cell growth.

[0033] Reference Figures 7 to 9 The bone ingrowth interface layer 25 is a trabecular bone structure layer; this structural design makes the topology more stable and reasonable. It should be noted that the bone ingrowth interface layer 25 can also be coated with tantalum, titanium, tantalum-titanium hybrid coating or fiber layer according to the patient's actual situation.

[0034] Reference Figures 7 to 9 The trabecular bone structure layer has a three-dimensional, interconnected porous network structure with a porosity of 60%–80%, similar to human cancellous bone, and a pore size of 600–800 μm. This provides excellent conditions for new bone ingrowth, facilitating bone ingrowth and nutrient exchange, resulting in better bone integration. The trabecular bone structure layer includes trabecular lattices 257 and a supporting mesh 253. The trabecular lattice 257 is attached to or fills the supporting mesh 253. The supporting mesh 253 is made of elastic strips with a double helix structure. There may be restrictive connectors between the helical mesh wires, which can improve the mechanical properties of the supporting mesh 253. The supporting mesh 253 can be made of various materials, such as titanium alloy and tantalum metal, which have good biocompatibility and are conducive to bone tissue growth and attachment. The double helix structure of the elastic strips can enhance the mechanical properties of the trabecular bone structure layer and avoid the problem of easy collapse of traditional trabecular bone structure layers.

[0035] Reference Figures 7 to 9To better facilitate bone ingrowth and reuse of the removed, high-quality host bone, the trabecular bone structure layer comprises, from top to bottom, a dense zone 251 and a sparse zone 252. Both the dense zone 251 and the sparse zone 252 contain squares 254 for filling with host bone fragments 256 or host bone debris, increasing bone mass reserve. Furthermore, the number of squares 254 per unit area in the dense zone 251 is greater than the number of squares 254 in the sparse zone 252. Fixing posts 255 are located within the squares 254. Because human bone has a layered tissue structure, the cancellous bone at the greater trochanter and the cancellous or cortical bone within the medullary canal below the shoulder of the femoral stem prosthesis 1 have different growth characteristics. Based on biomechanical characteristics, the trabecular bone structure layer is divided into a dense area 251 and a sparse area 252. The area above the shoulder of the femoral stem prosthesis 1, i.e., the greater trochanter region, is the dense area 251, which has more trabecular bone structure and host bone fragments 256. The area below the shoulder of the femoral stem prosthesis 1 is the sparse area 252, which has a lower density and fewer host bone fragments 256, or is entirely composed of trabecular bone structure. The graded design aims to disperse interfacial stress in the greater trochanter region, further reduce stress shielding, and allow autologous bone to act as a "bridge" for bone tissue growth, forming biological fixation. This allows the greater trochanter region to receive priority for early bone integration, forming biological fixation and achieving bone defect regeneration and repair.

[0036] Reference Figures 10 to 11 The connection structure between the prosthesis 2 and the femoral stem prosthesis 1 is a multi-dimensional intramedullary fixation structure, including a fixation platform 21 on the upper part of the prosthesis 2, an arcuate surface 28 on the lower part of the prosthesis 2, and circumferential wings 281 on both sides of the arcuate surface 28. The fixation platform 21 has an elliptical slot 211, and the femoral stem prosthesis 1 has a positioning platform 11 adapted to the fixation platform 21. The positioning platform 11 has a fastening threaded hole adapted to the elliptical slot 211. The prosthesis 2 and the femoral stem prosthesis 1 are fixed to the positioning platform 11 by fastening bolts 3 passing through the elliptical slot 211. In the fastening threaded hole of the platform 11; the fixed platform 21 is provided with a lifting lip 212 near the neck of the femoral stem prosthesis 1 on the arc surface to avoid assembly interference. The lifting lip 212 can avoid the neck of the femoral stem prosthesis 1, making the installation more fitting and convenient for adjustment; the arc surface 28 is adapted to the curvature of the back of the femoral stem prosthesis 1; the embracing wing 281 embraces the femoral stem prosthesis 1 inside; and the arc surface 28 and the embracing wing 281 are provided with locking grooves 29 for achieving internal and external degrees of freedom through bio-pressure fitting or bone cement bonding; this multi-dimensional intramedullary fixation method can reduce trauma and improve the fixation effect.

[0037] Reference Figures 10 to 11 The prosthesis 2 also has a tendon suture hole 22, which can strengthen fixation, reduce micromovement of the prosthesis, and reduce the risk of early loosening after surgery.

[0038] Reference Figures 12 to 13It should be noted that, depending on the actual situation of different patients, the embracing wings 281 on both sides of the curved face 28 can be removed, or they can be arranged on the fixed platform 21.

[0039] Reference Figure 14 It should be noted that, depending on the patient's actual situation and needs, the internal stent 23 can also be a solid body, made of titanium powder by 3D printing, and the buffer layer can also be made of titanium powder stacked on the internal stent 23 by 3D printing.

[0040] The implementation principle of this embodiment is as follows: The femoral trochanteric patch system, through the cooperation of the patch prosthesis 2 and the femoral stem prosthesis 1, and the design of the internal topology of the patch prosthesis 2, achieves effective repair of bone defects in the femoral trochanteric region; the bone ingrowth interface layer 25 provides space and support for bone tissue growth, and the elastic stimulation unit 241 in the buffer layer 24 can transmit elastic force to the bone ingrowth interface layer 25 when the prosthesis is subjected to force, promoting bone growth; the multi-dimensional intramedullary fixation structure reduces surgical trauma and improves fixation effect; these designs work together to improve the repair effect of femoral trochanteric bone defects, reduce stress shielding, and help the long-term fixation of the prosthesis. Compared with the prior art, it has significant improvements and contributions in solving bone defect problems, improving repair effect, and reducing postoperative risks. Example 2

[0041] Reference Figures 15 to 17 The difference between this embodiment and Embodiment 1 is that the prosthesis 2 is a modular structure, including an upper biomimetic trochanter 26 at the top and a lower connecting support 27 connected to the femoral stem prosthesis 1. The upper biomimetic trochanter 26 and the connecting support 27 are detachably connected. This modular structure has high flexibility and can be selected and combined according to the patient's specific situation. The assembly surface of the upper biomimetic trochanter 26 and the connecting support 27 has an L-shaped structure, including a vertical assembly surface and a horizontal assembly surface. The vertical assembly surface of the upper biomimetic trochanter 26 is provided with a dovetail tenon 261, and the vertical assembly surface of the connecting support 27 is provided with a dovetail tenon 261. The upper bionic ridge 26 has a matching connecting tenon 271; a tapered self-locking groove 262 is provided on the horizontal mounting surface of the upper bionic ridge 26, and a self-locking tenon 272 that matches the tapered self-locking tenon 272 is provided on the horizontal mounting surface of the connecting support 27; through the cooperation of the dovetail groove 261 and the connecting tenon 271, the tapered self-locking groove 262 and the self-locking tenon 272, a firm connection between the upper bionic ridge 26 and the connecting support 27 can be achieved, and it can be disassembled and replaced as needed; wherein, the tapered self-locking groove 262 and the self-locking tenon 272 are assembled by an interference fit, and the taper of the tapered self-locking groove 262 can be 2.8°±1° or 5.7°±1°.

[0042] The implementation principle of this embodiment is as follows: The patch prosthesis 2 adopts an assembled structure. The upper biomimetic trochanteric part 26 and the connecting support part 27 are detachably connected. The upper and lower parts have different thicknesses and specifications. Before implantation, according to the defects of the upper and lower parts, different thicknesses and suitable specifications can be found by trial molding before the prosthesis is assembled and implanted, resulting in a higher fit and providing a precise solution for different cases. At the same time, the patch prosthesis 2 has an shape that adapts to the proximal trochanteric part of the femur and has an internal topological structure. The topological structure includes bone from the outside to the inside. The trabecular structure layer and at least one buffer layer 24 are provided. The buffer layer 24 is provided with elastic stimulation units 241. The trabecular structure layer includes trabecular units with multi-level interconnected pores for bone ingrowth. The shape combined with the arched structure can disperse stress. The trabecular structure layer has a dense area 251 and a sparse area 252 and is provided with a grid 254 and a fixation post 255. The patch prosthesis 2 and the femoral stem prosthesis 1 adopt a multi-dimensional intramedullary fixation structure. These combined effects can fully fill the defects in the proximal femur, especially at the greater trochanter, reduce stress shielding, realize bone ingrowth, and strengthen fixation. Example 3

[0043] Reference Figures 18 to 19 The difference between this embodiment and Embodiment 1 is that a connector 5 is detachably fixed to the prosthesis 2 by a titanium screw 53. The connector 5 fixes the prosthesis 2 to the femur 4. The mounting surface of the connector 5 and the femur 4 is provided with protruding spikes 52. In order to facilitate the adjustment of the installation position of the connector 5 on the prosthesis 2, the connector 5 is provided with a connecting oval hole 51 that matches the titanium screw 53. For patients with high osteoporosis, a ligating device can also be used to tie the connector 5 to the femur 4. The ligating device can be made of titanium wire.

[0044] The implementation principle of this embodiment is as follows: A detachable connector 5 is provided on the prosthesis 2 and fixed with titanium nails 53, which can facilitate the installation and removal of the connector according to the actual situation; the mounting surface of the connector 5 and the human femur 4 is provided with protruding spikes 52, which can increase the friction and grip between the connector and the human femur, making the fixation more secure; the connector 5 is provided with a connecting oval hole 51 that matches the titanium nails 53, which facilitates the adjustment of the installation position of the connector 5 on the prosthesis to better adapt to the bone structure and surgical needs of different patients, and improve the flexibility and precision of the operation; for patients with high osteoporosis, the connector 5 is tied to the human femur 4 with a ligator 6, which can further enhance the connection stability between the connector and the human femur, providing a more reliable fixation method for osteoporosis patients, which helps to securely install the prosthesis 2 on the human femur 4, and promotes bone repair and healing.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this application.

Claims

1. A femoral trochanteric patch system, comprising a femoral stem prosthesis (1) capable of being inserted into a human femur (4) and a patch prosthesis (2) detachably connected to the upper end of the femoral stem prosthesis (1), characterized in that, The prosthesis (2) has a shape that is adapted to the proximal trochanter of the femur. An internal support (23) is provided inside the prosthesis (2). The back of the internal support (23) away from the femoral stem prosthesis (1) is covered with a buffer layer (24) and a bone ingrowth interface layer (25) from the inside to the outside. An elastic stimulation unit (241) is embedded in the buffer layer (24). The elastic stimulation unit (241) can transmit elastic recovery force to the bone ingrowth interface layer (25). The bone ingrowth interface layer (25) is used for bone tissue growth and attachment.

2. The femoral trochanteric patch system according to claim 1, characterized in that, The internal stent (23) has a three-dimensional through-hole network, the buffer layer (24) is an elastic material layer disposed between the internal stent (23) and the bone growth interface layer (25), and the elastic stimulation unit (241) is an elastic element embedded in the buffer layer (24).

3. The femoral trochanteric patch system according to claim 1, characterized in that, The shape of the patch prosthesis (2) is combined with an arched structure formed by curvature transition, which has the function of dispersing stress when subjected to external pressure.

4. The femoral trochanteric patch system according to claim 1, characterized in that, The patch prosthesis (2) is an assembled structure, including an upper bionic trochanter (26) located at the top and a connecting support (27) connected to the femoral stem prosthesis (1) at the bottom. The upper bionic trochanter (26) and the connecting support (27) are detachably connected.

5. The femoral trochanteric patch system according to claim 4, characterized in that, The upper biomimetic ridge (26) and the connecting support (27) have an L-shaped assembly surface, including a vertical assembly surface and a horizontal assembly surface; the upper biomimetic ridge (26) has a dovetail tenon (261) on its vertical assembly surface, and the connecting support (27) has a connecting tenon (271) that matches the dovetail tenon (261) on its vertical assembly surface; the upper biomimetic ridge (26) has a tapered self-locking groove (262) on its horizontal assembly surface, and the connecting support (27) has a self-locking tenon (272) that matches the tapered self-locking groove (262) on its horizontal assembly surface.

6. The femoral trochanteric patch system according to claim 1, characterized in that, The bone growth interface layer (25) includes at least one of the following: a trabecular structure layer, a tantalum coating, a titanium coating, a tantalum-titanium hybrid coating, an HA coating, a Ti+HA coating, or a fiber layer disposed on the buffer layer (24).

7. The femoral trochanteric patch system according to claim 6, characterized in that, The bone growth interface layer (25) includes a trabecular structure layer disposed on the buffer layer (24); the trabecular structure layer has a three-dimensional through porous mesh structure, including a trabecular lattice (257) and a support frame (253), the trabecular lattice is attached to the support frame (253) or filled in the support frame (253); the support frame (253) is composed of an elastic mesh structure.

8. The femoral trochanteric patch system according to claim 7, characterized in that, The bone growth interface layer (25) includes a dense area (251) and a sparse area (252) from top to bottom. Both the dense area (251) and the sparse area (252) are provided with squares (254) for filling host bone fragments (256). The number of squares (254) in the dense area (251) per unit area is greater than the number of squares (254) in the sparse area (252). The squares (254) are provided with fixing posts (255).

9. The femoral trochanteric patch system according to claim 1, characterized in that, The connection structure between the patch prosthesis (2) and the femoral stem prosthesis (1) is a multi-dimensional intramedullary fixation structure, including a fixation platform (21) set on the upper part of the patch prosthesis (2), an arc-shaped surface (28) set on the lower part of the patch prosthesis (2), and embracing wings (281) set on both sides of the arc-shaped surface (28). The fixation platform (21) is provided with an elliptical long slot (211), and the femoral stem prosthesis (1) is provided with a positioning platform (11) adapted to the fixation platform (21). The positioning platform (11) is provided with a fastening threaded hole adapted to the elliptical long slot (211). The arc-shaped surface (28) is adapted to the curvature of the back of the femoral stem prosthesis (1). The embracing wings (281) encircle the femoral stem prosthesis (1). The arc-shaped surface (28) and the embracing wings (281) are provided with grooves (29) for locking the internal and external degrees of freedom through bio-press fitting or bone cement bonding.

10. The femoral trochanteric patch system according to claim 9, characterized in that, The fixation platform (21) is provided with a lifting lip (212) near the neck arc surface of the femoral stem prosthesis (1) to avoid the feeling of fitting; the patch prosthesis (2) is also provided with a tendon suture hole (22), and the patch prosthesis (2) is connected and fixed to the human femur (4) through a connector (5).

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