Pelvis based on three-dimensional periodic minimal curved surface conformal design

Abstract

A three-dimensional periodic minimal curved surface conformal design-based pelvis comprises a pelvis prosthesis body, the pelvis prosthesis body is of a pore structure which is integrally formed through 3D printing and is formed by a plurality of three-dimensional periodic minimal curved surface (TPMS) metamaterial filling units, and the pelvis prosthesis is in a geometric shape symmetrical to a healthy pelvis side. The mounting end of the pelvic prosthesis is tangent to a pelvic defect part, the TPMS metamaterial can realize a complex geometrical shape under micron-level precision and can efficiently adapt to pelvis with different damage degrees, and the TPMS structure has bicontinuous or multi-continuous geometrical characteristics and can provide extremely high surface area and porosity in unit volume, so that the pelvic prosthesis can be applied to the pelvis with different damage degrees. The high surface area of the TPMS microstructure provides sufficient space for adhesion and growth of bone cells, and meanwhile, rapid invasion of vascular tissues and efficient transportation of nutrient substances are promoted through the continuous open pore channel design of the TPMS microstructure. Due to the characteristic, the osseointegration process can be accelerated, and the rehabilitation period of a patient can be remarkably shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, concretely is a pelvis based on three -dimensional period minimum surface conformal design. BACKGROUND

[0002] Human pelvis as the important structure of supporting the weight of torso and connecting lower limbs, after the defect caused by car accident or cancer etc., not only will lead to patient's action function to be limited, also can endanger life. The design of pelvis repair implant needs to satisfy the complex mechanics, morphology and biology requirement, therefore is widely paid attention to in the field of medical engineering, the existing prosthesis still has many deficiencies:

[0003] The poor fit of prosthesis bone interface can lead to stress concentration, thereby affecting the stability and long-term use effect of implant;

[0004] The surface of traditional implant usually cannot effectively provide sufficient biological interface for the attachment and growth of bone cells. This insufficient surface area limits the efficiency of bone integration, prolongs the rehabilitation period and can increase the risk of postoperative complications;

[0005] The implant of conventional design fails to consider strength and lightweight at the same time in mechanical properties, which can lead to the failure of implant under long-term complex load. In addition, the traditional material design cannot well simulate the mechanical properties of bone tissue, which can cause "stress shielding effect", further affecting the long-term health of bone quality;

[0006] Most implant designs cannot achieve multifunctional integration, such as antibacterial and drug release functions, which limits the applicability of implant under complex clinical requirements.

[0007] Therefore, it is necessary to provide a multifunctional lightweight pelvis prosthesis with high adaptability and high surface area utilization rate. UTILITY MODEL CONTENTS

[0008] The utility model aims at providing a pelvis based on three -dimensional period minimum surface conformal design to solve the problems of insufficient shape adaptability, low surface area utilization rate, insufficient mechanical properties and lack of functional integration of existing implant pelvis.

[0009] To achieve the above-mentioned purpose, the pelvis based on three -dimensional period minimum surface conformal design of the utility model, through the other side of the pelvis complete, based on CT data, the defective part is reconstructed, the pelvis prosthesis body is 3D printing integrated by the pore structure of a plurality of three -dimensional period minimum surface (TPMS) super material filling unit, the shape of the pelvis prosthesis is symmetrical with the other side of the pelvis complete, the mounting end of the pelvis prosthesis is tangent to the defective part of the pelvis.

[0010] Preferably, the pelvic prosthesis body (1) and the pelvic defect site shape conforming are achieved by using the method of Boolean operation, and the mounting end (3) is matched with the pelvic defect site.

[0011] Preferably, the unit period of the structure of the three-dimensional periodic minimal surface (TPMS) material is 1-2 mm.

[0012] Preferably, the porosity of the three-dimensional periodic minimal surface (TPMS) structure can be regionally adjusted according to the biomechanical requirements of different parts.

[0013] Preferably, the porosity of the three-dimensional periodic minimal surface (TPMS) structure is designed to be lower in the load-bearing area and higher in the repair area.

[0014] Preferably, a flow guide groove is arranged on the pelvic prosthesis body.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows:

[0016] The TPMS super material can realize complex geometric shapes under micron-level precision, can be efficiently matched with pelvic bones of different damage degrees, the TPMS structure has the geometric characteristics of double continuity or multi-continuity, can provide extremely high surface area and porosity in a unit volume, the high surface area of the TPMS microstructure provides sufficient space for the adhesion and growth of bone cells, and through the continuous open channel design, rapid invasion of vascular tissue and efficient transportation of nutrients are promoted. This characteristic not only can accelerate the bone integration process, but also can significantly shorten the rehabilitation period of patients. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are part of the present application, serve to provide a further understanding of the present application, and the schematic embodiments of the present application and the description thereof serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings:

[0018] Fig. 1 It is a three-dimensional assembly view of the pelvic bone based on the three-dimensional periodic minimal surface conformal design of the present application.

[0019] Fig. 2 It is a TPMS super material structure diagram based on the three-dimensional periodic minimal surface conformal design of the present application.

[0020] 1, pelvic prosthesis body; 2, three-dimensional periodic minimal surface (TPMS) super material filling unit; 3, mounting end; 4, flow guide groove. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, characteristics and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model will be described in detail below with reference to the drawings.

[0022] Please combine Figs. 1-2 The utility model discloses a pelvis based on three -dimensional period minimum surface conformal design, the pelvis prosthesis body 1 is 3D printing integrated by the porosity structure of a plurality of three -dimensional period minimum surface (TPMS) supermaterial filling unit 2,

[0023] Through the complete other side of the pelvis, the damaged part is reconstructed based on CT data, and in the design of the pelvis repair implant body, the accurate reconstruction of the shape of the damaged part is an important prerequisite for realizing the conformal of the pelvis prosthesis body 1 and the pelvis, and through the complete other side of the pelvis of the patient as a reference, the shape of the damaged area can be restored by using symmetry and anatomical principles. Specifically, first, the patient's pelvis is scanned by high-resolution CT to obtain a complete three-dimensional data set. Then, with the aid of medical image processing software, the scanning data is segmented and reconstructed, and the geometric shape of the healthy pelvis side is extracted as a digital model. In the reconstruction process, a reconstruction algorithm based on symmetry and biological anatomical features is adopted to mirror or appropriately adjust the model of the complete side to generate a digital model of the damaged part.

[0024] In addition, for the case where the morphology of the damaged area is complex and cannot be directly reconstructed by mirroring, the overall pelvis geometric features of the patient and the standard human pelvis database can be combined to generate a personalized reconstruction model through statistical morphological methods. This process can ensure that the reconstructed morphology of the damaged part is highly matched with the actual biomechanical environment, providing accurate reference for subsequent implant body design.

[0025] The pelvis prosthesis body 1 and the damaged shape are realized by Boolean operation, and in the adaptation of the mounting end 3 of the pelvis prosthesis and the damaged part of the pelvis, the shape of the pelvis prosthesis body 1 is highly conformal, for which the method of Boolean operation can be used to seamlessly integrate the designed supermaterial structure and the reconstructed damaged geometric model. First, the three-dimensional period minimum surface (TPMS) supermaterial is designed as a basic geometric unit suitable for bone repair. Through parameterized adjustment, its external shape can cover and nest the contour of the damaged area.

[0026] Then, based on the intersection, union and difference operations in Boolean operations, the missing shape and the metamaterial microstructure are mathematically fused. For example, through the "intersection" operation, the superfluous part of the metamaterial outside can be accurately trimmed, so that its boundary completely conforms to the three-dimensional shape of the missing part; through the "union" operation, the implant can be smoothly connected with the edge part of the healthy pelvis, forming a transition area to avoid stress concentration caused by shape mutation. At the same time, by using numerical optimization technology, the thickness and curvature distribution of the fusion area can be further adjusted to ensure the biomechanical adaptability of the implant.

[0027] This shape integration method based on Boolean operation not only enables the mounting end 3 of the pelvis prosthesis to be geometrically conformal with the missing part, but also can add design requirements for subsequent processing in the model generation stage, such as opening screw holes, flow guide grooves and other additional functions, thereby realizing the multifunctionality of the implant.

[0028] The three-dimensional periodic minimal surface metamaterial microstructure ensures topological characteristics such as large surface area and high porosity; the three-dimensional periodic minimal surface (TPMS) metamaterial microstructure provides an ideal design basis for pelvis repair with its unique continuous surface characteristics and excellent topological performance. Unlike traditional porous designs, TPMS structures have double-continuous or multi-continuous geometric characteristics, which can provide extremely high surface area and porosity per unit volume. Specifically, by selecting appropriate TPMS types (such as Gyroid, Schwarz-P or Diamond), the microstructure parameters, including periodicity, pore size and surface curvature distribution, can be precisely controlled, thereby achieving the comprehensive optimization of the material's efficient mechanical performance and biological function.

[0029] In use, the pelvis prosthesis body 1 is directly installed in the pelvis missing part through the bone screw, the high surface area of the TPMS microstructure provides sufficient space for the adhesion and growth of bone cells, and through its continuous open channel design, it promotes the rapid invasion of vascular tissue and efficient transportation of nutrients. This feature not only accelerates the bone integration process, but also significantly shortens the patient's recovery period. In addition, the porosity of the TPMS structure can be regionally adjusted according to the biomechanical requirements of different parts, such as designing lower porosity in the load-bearing area to enhance strength, and designing higher porosity in the repair area to promote the rapid regeneration of bone tissue. By combining advanced additive manufacturing technology, TPMS metamaterials can achieve complex geometric shapes with micron-level precision. Taking the human pelvis as an example, the unit period of the TPMS structure can be adjusted to the range of 1-2 mm to match the actual anatomical size of the pelvis. This high-precision manufacturing not only ensures the geometric conformality of the implant with the missing part, but also provides a long-term stable and efficient repair solution for patients by precisely controlling the structural characteristics.

[0030] Finally, it should be pointed out that the above embodiments are only representative examples of the present patent. Obviously, the present patent is not limited to the above embodiments, and there can be many variations. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present patent should be considered as falling within the protection scope of the present patent.

Claims

1. A pelvis based on three-dimensional periodic minimal surface conformal design, reconstructing the defective part based on CT data through the other side of the pelvis, characterized in that: The application relates to a pelvis prosthesis body (1) which is integrally formed by 3D printing and is filled with a plurality of three-dimensional periodic minimal surface (TPMS) super material pore structures (2), wherein the shape of the pelvis prosthesis is symmetrical to the other side of the complete pelvis, and the mounting end (3) of the pelvis prosthesis is tangent to the pelvis defect site. The shape of the pelvis prosthesis body (1) and the pelvis defect site are conformal by using a Boolean operation method, and the mounting end (3) is adapted to the pelvis defect site.

2. A pelvis based on a three-dimensional periodic minimal surface conformal design according to claim 1, characterized in that, The three-dimensional periodic minimal surface (TPMS) super material structure unit (2) has a period of 1-2 mm.

3. A pelvis based on a three-dimensional periodic minimal surface conformal design according to claim 1, characterized in that, The porosity of the three-dimensional periodic minimal surface (TPMS) structure can be regionally adjusted according to the biomechanical requirements of different parts.

4. The pelvis based on a three-dimensional periodic minimal surface conformal design according to claim 1, characterized in that, The porosity of the three-dimensional periodic minimal surface (TPMS) structure is designed to be low in the bearing area and high in the repair area.

5. A pelvis based on a three-dimensional periodic minimal surface conformal design according to claim 4, characterized in that, The pelvis prosthesis body is provided with a flow guide groove (4).

6. A pelvis based on a three-dimensional periodic minimal surface conformal design according to claim 1, characterized in that, ​

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