Bionic femoral head partial replacement prosthesis with porous structure

Abstract

The utility model discloses a bionic femoral head partial replacement prosthesis with a porous structure, and relates to the technical field of skeleton prostheses, the bionic femoral head partial replacement prosthesis comprises a tail end support, and a cross bolt is arranged at the bottom of the tail end support in a penetrating manner; a hollow prosthesis is arranged at the top end of the tail end support, an outer cup support is arranged at the top end of the hollow prosthesis, and a cartilage outer cup is arranged at the top end of the outer cup support. According to the utility model, the hollow design with sparse inside and dense outside is adopted, so that the prosthesis transmits load more uniformly, the stress of surrounding bones is reduced, and bone ingrowth is promoted; the design that the near end is dense and the far end is sparse is similar to the structural characteristics of the bone trabecula, so that more stable bone ingrowth is facilitated; that is to say, through the large-space hollow design at the tail section of the prosthesis, the self bone block can be conveniently filled, and the rejection reaction and complications possibly caused by allogeneic tissue implantation can be avoided by using the self bone block to fill the interior of the prosthesis; due to the fact that the bone blocks come from the patient, the possibility of immunological rejection is reduced, and the implantation success rate and the long-term effect can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bone prostheses, in particular to a bionic femoral head partial replacement prosthesis with a porous structure. Background Art

[0002] Osteonecrosis of the femoral head (ONFH) is a progressive, multifactorial disease characterized by impaired blood supply and disrupted bone tissue synthesis within the femoral head. The annual incidence of ONFH ranges from 7 to 20 per 100,000 people. Risk factors include high-dose steroid use, alcohol abuse, and trauma. ONFH primarily affects the weight-bearing area of ​​the femoral head and, if untreated, can lead to femoral head collapse and secondary hip osteoarthritis. Multiple clinical guidelines have reached a consensus on the classification of ONFH based on the Association for Circulatory Osteopathy (ARCO) staging system, specifically identifying stages I, II, and IV. For stages I and II, treatment options such as core decompression, bone grafting, or osteotomy are recommended. Stage IV requires total hip replacement surgery.

[0003] However, these techniques have limited applicability in the femoral head due to its greater curvature, deeper location, and compromised blood supply compared to other joints, such as the knee. Some researchers have proposed that, in addition to core decompression, implantation of porous tantalum rods, nonvascularized fibular grafts, or vascularized fibular grafts may help prevent further cartilage collapse. However, neither approach provides strong structural support, satisfactory osseointegration, or a simple procedure.

[0004] Currently, no effective solutions have been proposed for the problems in related technologies. Utility Model Content

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the utility model provides a bionic femoral head partial replacement prosthesis with a porous structure. It has the advantages of a porous structure to match the Young's modulus of human bones and reduce the burden of the bone scaffold on the human body, thereby solving the problem that traditional technology cannot provide strong structural support.

[0007] (2) Technical solution

[0008] In order to achieve the advantages of the above-mentioned porous structure to match the Young's modulus of human bones and reduce the burden of the bone scaffold on the human body, the specific technical solutions adopted by the present invention are as follows:

[0009] A bionic femoral head partial replacement prosthesis with a porous structure includes a tail end bracket with cross bolts inserted into the bottom of the tail end bracket; a hollow prosthesis is provided at the top of the tail end bracket, an outer cup bracket is provided at the top of the hollow prosthesis, and a cartilage outer cup is provided at the top of the outer cup bracket.

[0010] Furthermore, in order to design the back half of the replacement prosthesis into a large-space hollow structure so as to fill it with one's own bone blocks, using one's own bone blocks to fill the interior of the prosthesis can avoid rejection reactions and complications that may be caused by the implantation of allogeneic tissue. The tail end bracket is a tubular hollow structure, and a plurality of end openings are opened on the outer side of the circumference of the bottom of the tail end bracket, and a plurality of middle openings are opened on the outer side of the circumference of the middle part of the tail end bracket.

[0011] Furthermore, in order to achieve a stable connection between the hollow prosthesis and the tail end bracket, and the outward-designed connecting pin will not occupy the internal space of the hollow prosthesis, thereby improving the functionality of the hollow prosthesis, a mounting hole is provided at the top of the tail end bracket, and a connecting pin that matches the mounting hole is provided at the bottom of the hollow prosthesis.

[0012] Furthermore, in order to improve the stability of the hollow prosthesis on the end face of the tail end bracket and reduce the possibility of displacement or loosening of the prosthesis during movement, an anti-deflection groove is opened on one side of the mounting hole, and an anti-deflection protrusion is provided on one side of the connecting pin to cooperate with the anti-deflection groove.

[0013] Furthermore, in order to reduce the weight of the prosthesis itself, promote blood circulation, and reduce the possibility of immune rejection, the hollow prosthesis has a hollow porous structure in the middle part, and the porous structure is a three-periodic minimal surface porous structure.

[0014] Furthermore, in order to achieve a stable connection between the end cartilage outer cup, the outer cup bracket and the hollow prosthesis and prevent loosening or displacement, a number of connecting grooves are provided at the top of the hollow prosthesis, and a number of umbrella-shaped connecting columns that match the connecting grooves are provided at the bottom of the outer cup bracket.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the present invention provides a bionic femoral head partial replacement prosthesis with a porous structure, which has the following beneficial effects:

[0017] (1) By adopting a hollow design with sparse inside and dense outside, the prosthesis can transmit load more evenly, reduce the stress on the surrounding bones, and promote bone ingrowth; the design with dense proximal end and sparse distal end is similar to the structural characteristics of trabeculae, which is conducive to more stable bone ingrowth; that is, by hollowing out a large space at the tail end of the prosthesis to fill in the body's own bone blocks, using the body's own bone blocks to fill the inside of the prosthesis can avoid the rejection reaction and complications that may be caused by the implantation of allogeneic tissue; because the body's own bone blocks come from the patient, the possibility of immune rejection is reduced, which helps to improve the success rate of implantation and long-term effects.

[0018] (2) The innovative point of the connecting pin extending outward prevents the connecting part from occupying the hollow structure position inside the hollow prosthesis, thereby maintaining the advantages of the hollow structure to the greatest extent, such as reducing weight and promoting blood circulation. It can effectively avoid the waste of internal space of the prosthesis by the connecting part and improve the functionality and performance of the prosthesis.

[0019] (3) By designing cross bolts at the tail end bracket, the cross-fixation design can provide more firm support and fixation at the implant site, reducing the possibility of displacement and loosening of the prosthesis during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a bionic femoral head partial replacement prosthesis with a porous structure according to an embodiment of the present utility model;

[0022] Figure 2 This is a structural exploded view of a bionic femoral head partial replacement prosthesis with a porous structure according to an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the tail end support structure of a bionic femoral head partial replacement prosthesis with a porous structure according to an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the hollow prosthesis structure in the bionic femoral head partial replacement prosthesis with a porous structure according to an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the outer cup support structure of a bionic femoral head partial replacement prosthesis with a porous structure according to an embodiment of the present utility model;

[0026] Figure 6 This is one of the schematic diagrams of the replacement structure of the bionic femoral head partial replacement prosthesis with a porous structure in the femoral head according to an embodiment of the utility model;

[0027] Figure 7 This is the second schematic diagram of the replacement structure of the bionic femoral head partial replacement prosthesis with a porous structure in the femoral head according to an embodiment of the present utility model.

[0028] In the picture:

[0029] 1. Tail end bracket; 2. Cross bolt; 3. Hollow prosthesis; 4. Outer cup bracket; 5. Cartilage outer cup; 6. End opening; 7. Middle opening; 8. Mounting hole; 9. Connecting pin; 10. Anti-deflection groove; 11. Anti-deflection protrusion; 12. Connecting groove; 13. Umbrella-shaped connecting column. DETAILED DESCRIPTION

[0030] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0031] According to an embodiment of the present utility model, a bionic femoral head partial replacement prosthesis with a porous structure is provided.

[0032] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 5 As shown, the bionic femoral head partial replacement prosthesis with a porous structure according to an embodiment of the utility model includes a tail end bracket 1, a cross bolt 2 is inserted into the bottom of the tail end bracket 1; a hollow prosthesis 3 is provided at the top of the tail end bracket 1, an outer cup bracket 4 is provided at the top of the hollow prosthesis 3, and a cartilage outer cup 5 is provided at the top of the outer cup bracket 4.

[0033] With the help of the above technical solution, by adopting a hollow design with sparse inside and dense outside, the prosthesis can transfer load more evenly, reduce the stress of surrounding bones, and promote bone ingrowth; the design with dense proximal end and sparse distal end is similar to the structural characteristics of trabecular bone, which is conducive to more stable bone ingrowth; that is, by designing a large hollow space at the tail end of the prosthesis to fill in the patient's own bone blocks, using the patient's own bone blocks to fill the interior of the prosthesis can avoid the rejection reaction and complications that may be caused by the implantation of allogeneic tissue; because the patient's own bone blocks come from the patient, the possibility of immune rejection is reduced, which helps to improve the success rate and long-term effect of the implant. By designing cross bolts in the tail end bracket 1, the cross-fixed design can provide more solid support and fixation at the implant site, reducing the possibility of displacement and loosening of the prosthesis during movement.

[0034] In one embodiment, for the above-mentioned tail end bracket 1, the tail end bracket 1 is a tubular hollow structure, and a plurality of end openings 6 are opened on the outer side of the bottom circumference of the tail end bracket 1, and a plurality of middle openings 7 are opened on the outer side of the circumference of the middle part of the tail end bracket 1, so that the rear half of the replacement prosthesis is designed to be a hollow structure with a large space to fill in the body's own bone blocks. Using the body's own bone blocks to fill the inside of the prosthesis can avoid rejection reactions and complications that may be caused by the implantation of allogeneic tissue.

[0035] In one embodiment, for the above-mentioned tail end bracket 1, a mounting hole 8 is provided at the top of the tail end bracket 1, and a connecting pin 9 that cooperates with the mounting hole 8 is provided at the bottom end of the hollow prosthesis 3, thereby achieving a stable connection between the hollow prosthesis 3 and the tail end bracket 1, and the outward-facing connecting pin 9 will not occupy the internal space of the hollow prosthesis 3, thereby improving the functionality of the hollow prosthesis 3.

[0036] In one embodiment, for the above-mentioned mounting hole 8, an anti-deflection groove 10 is provided on one side of the interior of the mounting hole 8, and an anti-deflection protrusion 11 that cooperates with the anti-deflection groove 10 is provided on one side of the connecting pin 9, thereby improving the stability of the hollow prosthesis 3 on the end face of the tail end bracket 1 and reducing the possibility of displacement or loosening of the prosthesis during movement.

[0037] In one embodiment, for the hollow prosthesis 3 described above, the middle portion of the hollow prosthesis 3 is a hollow porous structure, and the porous structure is a three-periodic minimal surface porous structure, thereby reducing the weight of the prosthesis itself, promoting blood circulation, and reducing the possibility of immune rejection.

[0038] In one embodiment, for the above-mentioned hollow prosthesis 3, a plurality of connecting grooves 12 are provided at the top of the hollow prosthesis 3, and a plurality of umbrella-shaped connecting columns 13 that cooperate with the connecting grooves 12 are provided at the bottom of the outer cup bracket 4, thereby achieving a stable connection between the end cartilage outer cup 5, the outer cup bracket 4 and the hollow prosthesis 3 to prevent loosening or displacement.

[0039] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process is described in detail below.

[0040] In practical applications, the porous bionic femoral head partial replacement prosthesis is designed to mimic the structure of natural bone tissue to improve biocompatibility and prosthesis stability. Preoperative CT or MRI is performed to assess the extent of damage to the femoral head and hip joint. Preoperative planning is then performed to determine the prosthesis specifications and implantation plan. A hollow prosthesis 3 and a tail bracket 1 are pre-prepared for the patient, tailored to the curvature and size of the femoral head. During implantation, the surgeon incises the skin and soft tissue at the hip joint to expose the femoral head and acetabulum. The surgeon then separates the associated muscles and joint capsule to ensure full exposure of the hip joint. The damaged femoral head is partially removed, preserving the healthy bone structure to ensure a close fit between the prosthesis and the bone. The surgeon then cleans the acetabulum and surrounding tissues, removing any loose bone fragments and diseased tissue.

[0041] According to the design of the tail end bracket, the doctor drills a hole in the femoral medullary cavity to ensure that the tail end bracket can be accurately implanted. The tail end bracket 1 is inserted into the medullary cavity and fixed with cross bolts 2 to ensure the stability of the bracket. These bolts are cross-fixed to the healthy bone tissue in the femur through the bracket to provide additional mechanical support, and the body's own bone blocks are implanted inside the tail end bracket 1. The hollow prosthesis 3, the outer cup bracket 4 and the cartilage outer cup 5 are then implanted in sequence. The cartilage outer cup 5 can simulate natural articular cartilage, provide a smooth surface to reduce friction, and ensure normal movement of the prosthesis and acetabulum. The finished product after the replacement prosthesis is implanted, such as Figure 6 and Figure 7As shown, after all parts are installed, the doctor will test the stability and range of motion of the prosthesis by flexing and rotating the hip joint to ensure that it is functioning properly.

[0042] In summary, the above-mentioned technical solutions of the present invention utilize a hollow design with a sparse interior and dense exterior, allowing the prosthesis to transmit load more evenly, reducing stress on the surrounding bone and promoting bone ingrowth. The design with a dense proximal end and a sparse distal end, similar to the structural characteristics of trabecular bone, facilitates more stable bone ingrowth. The large hollow space at the prosthesis's tail section allows for the insertion of autologous bone fragments, which prevents rejection and complications associated with allogeneic tissue implantation. Because the autologous bone fragments come from the patient's own body, the possibility of immune rejection is reduced, helping to improve the success rate and long-term effectiveness of the implant. The innovative outward extension of the connecting pin 9 prevents the connection from occupying the hollow structure within the hollow prosthesis 3, thereby maximizing the advantages of the hollow structure, such as reducing weight and promoting blood circulation. This effectively avoids wasting space within the prosthesis by the connection, improving the functionality and performance of the prosthesis. The cross-bolt design within the tail bracket 1 provides a more secure support and fixation at the implant site, reducing the possibility of displacement and loosening of the prosthesis during movement.

[0043] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bionic femoral head partial replacement prosthesis with a porous structure, comprising a tail end bracket (1), characterized in that: A cross bolt (2) is inserted through the bottom of the tail end bracket (1); The top of the tail end bracket (1) is provided with a hollow prosthesis (3), the top of the hollow prosthesis (3) is provided with an outer cup bracket (4), and the top of the outer cup bracket (4) is provided with a cartilage outer cup (5).

2. The porous bionic femoral head partial replacement prosthesis according to claim 1, characterized in that: The tail end bracket (1) is a tubular hollow structure, a plurality of end openings (6) are provided on the outer side of the bottom circumference of the tail end bracket (1), and a plurality of middle openings (7) are provided on the outer side of the middle part circumference of the tail end bracket (1).

3. The porous bionic femoral head partial replacement prosthesis according to claim 1, characterized in that: The top end of the tail end bracket (1) is provided with a mounting hole (8), and the bottom end of the hollow prosthesis (3) is provided with a connecting pin (9) that matches the mounting hole (8).

4. The porous bionic femoral head partial replacement prosthesis according to claim 3, characterized in that: An anti-deflection groove (10) is provided on one side of the interior of the mounting hole (8), and an anti-deflection protrusion (11) that matches the anti-deflection groove (10) is provided on one side of the connecting pin (9).

5. The porous bionic femoral head partial replacement prosthesis according to claim 1, characterized in that: The hollow prosthesis (3) has a hollow porous structure in the middle portion, and the porous structure is a three-periodic minimal surface porous structure.

6. The porous bionic femoral head partial replacement prosthesis according to claim 1 or 5, characterized in that: The top end of the hollow prosthesis (3) is provided with a plurality of connecting grooves (12), and the bottom end of the outer cup bracket (4) is provided with a plurality of umbrella-shaped connecting columns (13) that match the connecting grooves (12).

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