Hemispherical titanium mesh cup with wings and preparation method thereof

Abstract

The invention discloses a winged hemispherical titanium mesh cup and a preparation method thereof, and belongs to the technical field of orthopedic prostheses, the winged hemispherical titanium mesh cup comprises a hemispherical mesh cup body and three wing plates capable of being trimmed, the winged hemispherical titanium mesh cup is made of titanium alloy through 3D printing, the three wing plates capable of being trimmed extend out of the hemispherical mesh cup body, the three wing plates capable of being trimmed cover the pubic ramus, the ischium ramus and the iliac wing respectively, and the three wing plates capable of being trimmed extend out of the hemispherical mesh cup body. By means of the design, the fixity and stability of the winged hemispherical titanium mesh cup in the acetabulum area are enhanced; the three wing plates capable of being trimmed can be trimmed according to the actual situation of bone defects so as to adapt to individualized requirements; the hemispherical structure is combined with a titanium mesh material, so that the covering and supporting effects on a bone defect area are improved; wing curvature and main body stress distribution are determined through finite element analysis, local stress concentration is reduced, and reliability in a dynamic load bearing environment is improved; the performance of the material is excellent; the 3D printing technology is adopted, so that the production cost of complex design and personalized customization is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of orthopedic prostheses, and specifically relates to a 3D-printed hemispherical titanium mesh cup with wings for acetabulum revision after hip replacement surgery and a preparation method thereof, which is particularly suitable for the repair and reconstruction of severe bone defect cases. Background Art

[0002] Hip replacement is a widely used surgery to treat hip diseases, but postoperative acetabular bone dissolution and loosening are common complications; these problems often need to be resolved through revision surgery. During the revision process, the repair of bone defects is the key; there are currently various strategies for hip revision, but for cases of bone defects, the main goal is to restore bone mass as much as possible to improve postoperative stability and long-term functional recovery; however, the importance of bone mass restoration is further highlighted as revision patients are getting younger. Some existing procedures, such as the use of large metal implants, may further damage existing bone mass or limit their widespread application due to their high prices.

[0003] The existing revision methods for bone defects are as follows: 1. Compression bone grafting method: restore bone mass and provide a stable foundation by filling with granular bone grafts.

[0004] 2. Implanting piles, screws and connecting pile caps in the pubic ramus and ischial ramus of the posterior iliac column: Strengthening the support of the bone defect area through mechanical fixation.

[0005] 2. Winged hemispherical titanium mesh bone cement acetabular cup: Combining the support of titanium mesh and the fixation of bone cement, it can not only significantly restore bone mass, but also provide good initial stability.

[0006] This method can solve the challenge of bone defects to a certain extent, but a solution with stability, plasticity and economy is still needed. However, the existing titanium mesh cups on the market usually lack sufficient wrapping and adaptability, making it difficult to effectively treat severe local bone defects and have poor adaptability to complex bone structures.

[0007] The existing technology has the following limitations: 1. Compression bone grafting technique: Although it can restore bone mass, the initial stability is insufficient and it is easy to cause graft displacement; 2. Metal implants (such as titanium cups): Traditional designs have poor wrapping properties and are difficult to adapt to complex bone defect shapes. Excessive rigidity can easily cause stress shielding. 3. Combined fixation device: complex structure, high cost, and insufficient flexibility for intraoperative adjustment.

[0008] The existing titanium mesh cups on the market generally have the following problems: 1. Insufficient wrapping, non-hemispherical, lack of anatomical adaptability, and insufficient support for the pubic branch, sciatic branch and iliac wing; 2. The non-trimmable design makes it difficult to match the personalized bone defect shape; 3. The surface pore structure is not optimized and the bone ingrowth efficiency is low. Summary of the invention

[0009] The present invention proposes a winged hemispherical titanium mesh cup and a preparation method thereof, which realizes the unity of stability, adaptability and economy in bone defect repair through structural innovation and material optimization, and is used to improve the effect of bone defect repair in acetabulum revision. The present invention provides an ideal choice for the revision of bone defect cases through optimized design and material selection.

[0010] A winged hemispherical titanium mesh cup comprises a hemispherical mesh cup body and three trimmable wing plates, the three trimmable wing plates extend from the hemispherical mesh cup body, the three trimmable wing plates respectively cover the pubic branch, the ischial branch and the iliac wing, and the hemispherical mesh cup body and the three trimmable wing plates are all made of titanium alloy 3D printing.

[0011] The outer diameter of the hemispherical mesh cup body is 40-60 mm, and micropores with a pore size of 300-500 μm are evenly distributed on the surface.

[0012] The thickness of the three trimmable wing plates is 0.5-1.0 mm, and they can be cut according to the shape of the bone defect during surgery; the edges are serrated to enhance bone-implant friction.

[0013] The titanium alloy is Ti6Al4V.

[0014] A method for preparing a hemispherical titanium mesh cup with wings: Based on the patient's preoperative CT / MRI data, a hemispherical titanium mesh cup with wings was customized using selected laser melting (SLM) 3D printing technology to achieve anatomical matching; the surface was sandblasted and acid-etched to form a rough porous structure with an Ra value controlled at 20-50 μm.

[0015] Beneficial technical effects of the present invention: 1. Winged design: The winged hemispherical titanium mesh cup extends three trimmable wing plates based on the hemispherical mesh cup body, which are located at the pubic branch, sciatic branch and iliac wing respectively; this design enhances the fixation and stability of the winged hemispherical titanium mesh cup in the acetabulum area.

[0016] 2. Trimmability: The three trimmable wing plates can be trimmed according to the actual condition of the bone defect to meet individual needs.

[0017] 3. Superior wrapping: The hemispherical structure combined with titanium mesh material improves the coverage and support effect on the bone defect area.

[0018] 4. Biomechanical optimization: The curvature of the wing and the main stress distribution are determined through finite element analysis to reduce local stress concentration (<15 MPa). The stress distribution of the winged hemispherical titanium mesh cup under different load conditions is verified through finite element analysis to improve its reliability in dynamic load-bearing environments.

[0019] 5. Superior material performance: Titanium alloy materials have extremely high corrosion resistance, strength and toughness, and their surface pore structure is conducive to the growth of bone tissue.

[0020] 6. Cost-effectiveness: The use of cost-effective 3D printing technology reduces the production costs of complex designs and personalized customization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the present invention.

[0022] Figure 2 It is a three-dimensional schematic diagram of the present invention.

[0023] Figure 3 It is a three-dimensional schematic diagram from another viewing angle of the present invention.

[0024] Figure 4 It is a front view of the present invention implanted during surgery.

[0025] Figure 5 is a side view of the present invention being implanted during surgery.

[0026] Figure 6 It is a front view of the trimmable wing panel of the present invention after trimming.

[0027] Figure 7 It is a fixed effect diagram of the present invention.

[0028] Figure 8 It is the finite element distribution diagram of the present invention.

[0029] Fig. 9 It is the finite element working condition setting diagram of the present invention. DETAILED DESCRIPTION

[0030] like Figure 1 , Figure 2 , Figure 3 As shown, a winged hemispherical titanium mesh cup includes a hemispherical mesh cup body 1 and three trimmable wing plates 2. The three trimmable wing plates 2 extend from the hemispherical mesh cup body. The three trimmable wing plates 2 cover the pubic branch, the ischial branch and the iliac wing respectively. The hemispherical mesh cup body 1 and the three trimmable wing plates 2 are all made of titanium alloy 3D printing.

[0031] The outer diameter of the hemispherical mesh cup body 1 is 40-60 mm, and micropores with a pore size of 300-500 μm are evenly distributed on the surface.

[0032] The thickness of the three trimmable wing plates 2 is 0.5-1.0 mm, and they can be cut according to the shape of the bone defect during surgery; the edges are serrated to enhance bone-implant friction.

[0033] The titanium alloy is Ti6Al4V.

[0034] A method for preparing a hemispherical titanium mesh cup with wings: Based on the patient's preoperative CT / MRI data, a hemispherical titanium mesh cup with wings was customized using selected laser melting (SLM) 3D printing technology to achieve anatomical matching; the surface was sandblasted and acid-etched to form a rough porous structure with an Ra value controlled at 20-50 μm.

[0035] like Figure 4 and Figure 5 As shown, the method of surgical installation of the present invention: 1. Preoperative planning: Generate a three-dimensional model of the acetabular defect through reverse engineering, design the shape of the hemispherical titanium mesh cup with wings and the length of the trimmable wing plate 2; 2. Operation during surgery: 2.1. Clear the fibrous membrane and loose bone cement in the acetabulum; 2.2. Implant allogeneic bone particles by pressing, the particle size of allogeneic bone particles is 2-5 mm; 2.3, such as Figure 6 As shown, the trimmable wing plate 2 of the winged hemispherical titanium mesh cup is trimmed to ensure that it fits the bone surface and then is placed in the acetabulum, as shown in FIG. Figure 7 As shown; 2.4 Use bone cement (PMMA) and locking screws to fix the titanium mesh cup and acetabular cup; Postoperative evaluation: X-ray and CT were used to verify the fusion of bone-implant interface.

[0036] Theoretical basis and applicability: 1. Applicable patient groups: Younger patients: As revision surgery patients are getting younger, the bone defects in this group are usually characterized by insufficient bone mass and complex bone structure. The present invention can effectively solve this problem through personalized design.

[0037] Elderly patients: Among elderly patients, bone defects caused by osteoporosis are more prominent. The design of the present invention can provide sufficient support and significantly improve postoperative stability.

[0038] 2. Material advantages of the present invention: Titanium alloy properties: 1.1. Biocompatibility: Titanium alloy materials have good compatibility with human tissues and can reduce postoperative inflammatory reactions.

[0039] 1.1. Mechanical properties: Its high strength and low elastic modulus help reduce stress shielding effect and promote bone growth.

[0040] 1.3 Corrosion resistance: It exhibits superior corrosion resistance in body fluid environment and ensures long-term stability.

[0041] Surface Porosity Optimization: The pore distribution is precisely controlled through 3D printing technology, with a pore size of 300-500 microns, which facilitates the adhesion, proliferation and differentiation of bone cells.

[0042] 3. Biomechanical performance test: Finite element analysis method is used to simulate the stress distribution of the titanium mesh cup under different load conditions: 1.1. The hemispherical mesh cup body 1 exhibits a relatively uniform stress distribution when subjected to axial and radial loads.

[0043] 1.2. The design of three trimmable wing panels 2 significantly reduces the local stress concentration phenomenon of the ilium, pubic bone and ischial ramus.

[0044] Verified by in vitro experiments: 2.1. The stability of the winged hemispherical titanium mesh cup under dynamic load conditions is significantly better than that of existing commercially available products.

[0045] 2.2. The structural strength of the three trimmable wing panels 2 after trimming meets the requirements of clinical applications.

[0046] The present invention adopts Ti6Al4V alloy material, and establishes a complete model of a hemispherical titanium mesh cup with wings and a corresponding connection structure in finite element analysis software to simulate the load distribution and transfer process of the hip joint under gait conditions. In the analysis, joint reaction force is applied to the product as the main external load, and fixed boundary conditions are applied to the three-wing support area and the corresponding contact surface to fully simulate the mechanical environment after implantation.

[0047] like Figure 8 and Fig. 9 As shown in the figure, under gait conditions, the simulation results show that the maximum stress of the hemispherical three-wing titanium mesh cup in the overall structure is about 428MPa, which does not exceed the yield stress range of Ti6Al4V alloy, which is usually above 800MPa. It can be judged that the prosthesis will not produce material failure or damage risks under normal gait loads; at the same time, by strengthening the force uniformity of the three trimmable wing plates 2 supporting parts and the hemispherical mesh cup body 1, the stability of the contact surface with bone tissue is significantly improved. The analysis results show that the hemispherical titanium mesh cup with wings has good load-bearing capacity and fatigue life, and can provide reliable bone fixation and long-term mechanical support in clinical practice.

[0048] In summary, the safety and stability of the present invention under normal gait loads have been verified through finite element analysis. The three-wing support structure combined with the titanium mesh cup wall can achieve stable support and stress dispersion for the surrounding bone tissue, meet the mechanical performance requirements for long-term implantation, and provide a high-strength and excellent biocompatible solution for bone defect repair and joint replacement surgery.

[0049] Surgical method: 1. Preoperative preparation: Based on the patient's CT or MRI data, the size and shape of the winged hemispherical titanium mesh cup are customized through 3D printing technology.

[0050] 2. Clean the defect area: remove loose tissue and ensure the acetabular bed is clean.

[0051] 3. Bone grafting: Use granular bone graft to fill the defect area.

[0052] 4. Titanium mesh cup adjustment: Trim three trimmable wing plates 2 according to the defect, place them into the acetabulum and ensure they fit closely with the surrounding bones.

[0053] 5. Fixation: Use screws and bone cement to fix the winged hemispherical titanium mesh cup and the acetabular cup on it.

[0054] 6. Postoperative examination: The stability of the winged hemispherical titanium mesh cup and the bone implant fusion were verified by imaging examination.

[0055] Clinical advantages: 1. The three trimmable wing panels 2 design enhances multi-directional fixation and improves anti-rotation torque; 2. The trimmability of the three trimmable wing plates 2 can be adapted to the Paprosky III bone defect, and the intraoperative adjustment time is shortened; 3. The microporous structure on the surface increases the bone ingrowth rate.

[0056] 4. Economical: 3D printing technology reduces customization costs, and the production cost of a single piece is lower than that of traditional technology.

[0057] Advantages of clinical use: Improve postoperative fixation effect and reduce the failure rate of revision surgery.

[0058] It can adapt to a variety of complex bone defects and significantly enhance patients' postoperative functional recovery.

[0059] Provide better biomechanical stability and reduce postoperative complications.

[0060] It is economical and efficient, and suitable for large-scale clinical promotion.

Claims

1. A hemispherical titanium mesh cup with wings, characterized in that: The invention comprises a hemispherical mesh cup body (1) and three trimmable wing plates (2), wherein the three trimmable wing plates (2) extend from the hemispherical mesh cup body, and the three trimmable wing plates (2) respectively cover the pubic ramus, the ischial ramus and the iliac wing, and the hemispherical mesh cup body (1) and the three trimmable wing plates (2) are all made of titanium alloy 3D printing.

2. A hemispherical titanium mesh cup with wings according to claim 1, characterized in that: The outer diameter of the hemispherical mesh cup body (1) is 40-60 mm, and micropores with a pore size of 300-500 μm are evenly distributed on the surface; the thickness of the three trimmable wing plates (2) is 0.5-1.0 mm, and the edges are serrated.

3. The hemispherical titanium mesh cup with wings according to claim 1, characterized in that: The titanium alloy is Ti6Al4V.

4. A method for preparing a hemispherical titanium mesh cup with wings as claimed in claim 1, the method being as follows: Based on the patient's preoperative CT / MRI data, a hemispherical titanium mesh cup with wings was customized using selective laser melting 3D printing technology to achieve anatomical matching; the surface was sandblasted and acid-etched to form a rough porous structure, and the Ra value was controlled at 20-50 μm.

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