Preparation method of personalized artificial prosthesis

Abstract

The invention discloses a preparation method of a personalized artificial prosthesis, which comprises the following steps: S1, calculating a biomechanical value corresponding to an affected part based on a medical image; s2, simulating a lattice unit model with the biomechanical value; s3, screening crystal lattice units matched with the mechanical properties of the crystal lattice unit model from a crystal lattice database; and S4, filling and stacking the lattice units in the porous structure to complete the preparation of the personalized artificial prosthesis. According to the method, the efficiency of the preparation process of the personalized artificial prosthesis can be improved, the artificial prosthesis is prepared by screening the lattice units matched with the elastic modulus at the affected part in the database, the iteration process of simulation and mechanical testing in the traditional artificial prosthesis preparation process is avoided, the personalized artificial prosthesis is automatically generated, repeated design is not needed, and the production efficiency of the personalized artificial prosthesis is improved. And the efficiency and the accuracy of medical instrument design are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of orthopedic implant medical devices, and relates to a preparation method of a personalized artificial prosthesis. BACKGROUND

[0002] The existing 3D printing orthopedic medical device preparation process generally comprises the following three steps: first, designing a printing model file of the medical device; second, applying 3D printing technology to produce and prepare the medical device; and third, post-processing the printed medical device to prepare a formed product.

[0003] The existing 3D printing orthopedic medical device preparation process often has the phenomenon of stress concentration in the porous structure area when processing and setting the orthopedic medical device with a porous structure, which leads to poor mechanical properties of the prepared medical device and the need to return to the design step for re-preparation. The specific reason for the stress concentration phenomenon is that the porous structure is composed of multiple connecting rod structures, and the unique structure of the connecting rod leads to uneven stress distribution in some areas, and even structural defects, thereby leading to stress concentration.

[0004] Therefore, there is a need for a method of intervening in the setting of the rod diameter of the porous structure in the design stage of the 3D printing orthopedic medical device, which can make feedback according to the stress value in the mechanical simulation and timely adjust the size of the rod diameter of the porous structure to eliminate the phenomenon of stress concentration. SUMMARY

[0005] Therefore, the application provides a preparation method of a personalized artificial prosthesis for customizing the elastic modulus value of a 3D printed implant with a porous structure, which comprises the following steps:

[0006] S1, calculating the corresponding biomechanical value of the affected area based on medical images;

[0007] S2, simulating a lattice unit model with the biomechanical value;

[0008] S3, selecting a lattice unit with mechanical properties matched with the lattice unit model from a lattice database 102;

[0009] S4, filling and stacking the lattice unit in the porous structure to complete the preparation of the personalized artificial prosthesis.

[0010] Optionally, the personalized artificial prosthesis is composed of the porous structure and a solid structure, the lattice unit comprises a support rod, and the support rod is filled and stacked in the lattice unit to form a support pore between adjacent support rods.

[0011] Optionally, in step S1, the biomechanical value is calculated from the average elastic modulus of the bone defect site 101 of the affected area.

[0012] Optionally, in step S3, the structure parameters of the lattice unit that need to be regulated to achieve the matching of the mechanical properties include the diameter of the support rod, the porosity of the lattice unit, and the diameter of the support hole.

[0013] Optionally, in step S3, the lattice database includes random lattice unit data and regular lattice unit data.

[0014] According to the technical solution of the present application, the above-mentioned application has the following advantages or beneficial effects:

[0015] The artificial prosthesis provided by the present application can improve the efficiency of the preparation process of personalized artificial prostheses, and the lattice unit with a matching elastic modulus is screened from the database to prepare the artificial prosthesis, thereby avoiding the iteration process of simulation and mechanical testing in the traditional artificial prosthesis preparation process, realizing the automatic generation of personalized artificial prostheses, and improving the efficiency and accuracy of medical device design without repeated design.

[0016] The further effects of the above-mentioned non-conventional optional mode will be described in the following combined with the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are used to better understand the present application and do not constitute an improper limitation on the present application. Among them:

[0018] Fig. 1 is a flowchart of a design method for adjusting the rod diameter based on the stress value in an embodiment of the present application;

[0019] Fig. 2 is a front view schematic diagram of the porous structure before and after adjusting the rod diameter in an embodiment of the present application;

[0020] Explanation of reference signs:

[0021] 2-porous structure, 21-lattice unit, 101-bone defect site, 102-lattice database. DETAILED DESCRIPTION

[0022] In order to better illustrate the present application and facilitate the understanding of the technical solution of the present application, the present application will be further described in detail below. However, the following examples are only simple examples of the present application and do not represent or limit the protection scope of the present application. The protection scope of the present application is subject to the claims.

[0023] For simplicity, some technical features known to those skilled in the art are omitted in the following description.

[0024] According to one embodiment of the present application, as shown in Figs. 1-2 A preparation method of a personalized artificial prosthesis for customizing the elastic modulus value of a 3D printed implant body with a porous structure 2, comprising the following steps:

[0025] S1, calculating the biomechanical value corresponding to the affected area based on medical images;

[0026] S2, simulating a lattice unit model with the biomechanical value;

[0027] S3, screening a lattice unit 21 with mechanical properties matching the lattice unit model from a lattice database;

[0028] S4, filling and stacking the lattice unit 21 in the porous structure 2 to complete the preparation of the personalized artificial prosthesis.

[0029] The personalized artificial prosthesis is composed of the porous structure 2 and the solid structure 3, and the lattice unit 21 includes a support rod 211, which is filled and stacked in the lattice unit 21 to form a support pore 212 between adjacent support rods.

[0030] In the step S1, the biomechanical value is calculated by the average elastic modulus of the bone defect site of the affected area.

[0031] In the step S2, the lattice unit model structure includes a regular hexahedron structure, a regular tetrahedron structure, and a spherical structure.

[0032] In the step S3, the structure parameters of the lattice unit 21, including the rod diameter of the support rod 211, the porosity of the lattice unit 21, and the pore diameter of the support pore 212, need to be regulated to achieve the mechanical property matching.

[0033] Specifically, the porosity of the lattice unit 21 is regulated by the rod diameter of the support rod 211 and the pore diameter of the support pore 212. Both the rod diameter of the support rod 211 and the pore diameter of the support pore 212 are positively correlated with the porosity.

[0034] In the step S3, the lattice database includes random lattice unit data and regular lattice unit data.

[0035] The 3D printing implant material is metal, specifically 3D printing metal, including but not limited to titanium alloy, tantalum alloy, cobalt-chromium alloy, and magnesium alloy.

[0036] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing a personalized artificial prosthesis, used to customize the elastic modulus value of a 3D-printed implant with a porous structure, characterized in that, The method includes the following steps: S1, based on medical images, calculates the biomechanical values ​​corresponding to the affected area; S2, simulates a lattice unit model with the aforementioned biomechanical values; S3, Select lattice units from the lattice database that match the mechanical properties of the lattice unit model; S4, the lattice units are filled and stacked in the porous structure to complete the preparation of the personalized artificial prosthesis.

2. The method for preparing a personalized artificial prosthesis according to claim 1, characterized in that, The personalized artificial prosthesis is composed of the porous structure and the solid structure. The lattice unit includes support rods, which are filled and stacked within the lattice unit to form support pores between adjacent support rods.

3. The method for preparing a personalized artificial prosthesis according to claim 2, characterized in that, In step S1, the biomechanical value is calculated from the average elastic modulus of the bone defect site.

4. The method for preparing a personalized artificial prosthesis according to claim 3, characterized in that, In step S3, achieving the mechanical property matching requires adjusting the structural parameters of the crystal unit, including the diameter of the support rod, the porosity of the crystal unit, and the diameter of the support pore.

5. The method for preparing a personalized artificial prosthesis according to claim 4, characterized in that, In step S3, the lattice database includes random lattice unit data and regular lattice unit data.

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