3D打印前臂外固定支具的有限元分析与结构优化设计  

Finite element analysis and structural optimization design of 3D printed forearm braces

作　　者：彭志鑫 闫文刚 王坤 张振江 Peng Zhixin;Yan Wengang;Wang Kun;Zhang Zhenjiang(School of Mechanical Engineering,Inner Mongolia University of Technology,Hohhot 010000,Inner Mongolia Autonomous Region,China;Inner Mongolia Honorary Soldier Mutilation Rehabilitation Center,Hohhot 010000,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古工业大学机械工程学院,内蒙古自治区呼和浩特市010000 [2]内蒙古荣誉军人肢残康复中心,内蒙古自治区呼和浩特市010000

出　　处：《中国组织工程研究》2023年第9期1340-1345,共6页Chinese Journal of Tissue Engineering Research

基　　金：2020年教育部产学合作协同育人资助项目(2020002232006),项目负责人:王坤;内蒙古自然科学基金(2021LHMS05004),项目负责人:闫文刚。

摘　　要：背景:使用3D打印技术制作适合患者个性化的支具普遍存在,但却缺乏支具对前臂骨折断裂处保护效果的生物力学验证。目的:将逆向建模、有限元分析与拓扑优化等方法相结合,提出一种3D打印制作前臂支具的可行性方法,并通过有限元分析验证支具的有效性。方法:采用逆向建模方法,通过医学图像处理软件Mimics构建1例男性志愿者前臂模型,并利用参数化设计软件Grasshopper对Rodin 4D采集的前臂数据进行处理并建立支具模型。依据前臂生物力学特性对佩戴支具的前臂整体模型进行有限元分析,再根据有限元分析结果对支具进行拓扑优化并作打孔处理,最后用3D打印机将支具打印出来。结果与结论:(1)在100 N的压力载荷下,骨折断裂处应力与位移分别为1.53 MPa和0.27 mm,而前臂在支具保护下断裂处的应力与位移分别下降到0.19 MPa和0.005 mm;(2)在保证支具力学性能前提下对支具进行拓扑优化,通过对比优化后支具的支承刚度结果,选择减少40%体积作为优化结果,再根据优化结果使用Grasshopper插件对支具进行打孔减材处理;(3)通过对比由不同文样镂空设计的支具强度,选择泰森多边形作为打孔文样;(4)提出使用数字化设计与3D打印技术制作的前臂支具具有可行性,实验建立了完整的前臂支具设计、验证及制造系统。BACKGROUND:The use of 3D printing technology to make personalized braces for patients is widespread,but there is a lack of biomechanical verification of the protective effect of braces on fracture sites.OBJECTIVE:To combine reverse modeling,finite element analysis and topology optimizatio n,propose a feasible method of 3D printing forearm bracing,and to ve rify the effectiveness of the brace through finite element analysis.METHODS:Reverse modeling was used to construct a male volunteer forearm model by medical image processing software Mimics.Parametric design software Grasshopper was used to process the forearm data collected by Rodin 4D and to establish the brace model.Based on the biomechanical properties of the forearm,finite element analysis was carried out on the whole model of the forearm wearing the brace.The topology optimization and drilling we re carried out on the brace according to the finite element analysis res ults.Finally,the brace was printed with a 3D printer.RESULTS AND CONCLUSION:(1)Under the pressure load of 100 N,the stress and displacement at fra cture point were 1.53 MPa and 0.27 mm,respectively,while the stress and dis placement at fracture point of the forearm under the protection of brace were 0.19 MPa and 0.005 mm,respectively.(2)Topology optimization was carried out on the premise of ensuring the mechanical prope rties of the brace.By comparing the stiffness results of the optimized brace,40%volume reduction was selected as the optimization result.According to the optimization res ults,G rasshopper plug-in was used to drill holes and reduce materials for the support.(3)By comparing the strength analysis of the brace designed by the hollow out of diffe rent samples,the Tyson polygon was selected as the punching sample.(4)This article proposes the feasibility of using digital design and 3 D printing technology for the forearm brace,and establishes a complete forearm brace design,ve rification and manufa cturing system.

关 键 词：前臂骨折 生物力学 逆向建模 3D打印 有限元分析 拓扑优化 数字化设计 泰森多边形 镂空设计 

分 类 号：R459.9[医药卫生—治疗学] R318[医药卫生—临床医学] O242.21[理学—计算数学]