基于拓扑优化技术的分块式脊柱侧凸支架三维打印  

Three-dimensional Printing of Segmental Scoliosis Support based on Topology Optimization Technology

作　　者：陈鹤天 陈继民 袁艳萍[1,2] 晏恒峰 Chen Hetian;Chen Jimin;Yuan Yanping;Yan Hengfeng(Beijing Digital Medical 3 D Printing Engineering Research Center,Beijing100124,China;Institute of Laser Engineering,Beijing University of Technology,Beijing100124,China)

机构地区：[1]北京市数字化医疗3D打印工程技术研究中心,北京100124 [2]北京工业大学激光工程研究院,北京100124

出　　处：《应用激光》2019年第3期514-520,共7页Applied Laser

摘　　要：针对目前制作特发性脊柱侧凸支架存在加工周期长,在患者身上涂泥取模,加工流程冗长等问题,一些措施应该被采取来解决这些问题。将选择性烧结3D打印技术运用到特发性脊柱侧凸支架的整体制造中,经过试验测试,选择性烧结技术可以极大地缩短支架加工时间,减少加工步骤,并且对支架形态进行测试方面有着一定的优势,提高特发性脊柱侧凸支架制造的效率。主要借助手持式扫描仪对患者进行身体扫描,并根据扫描结果建立分块式脊柱侧凸矫正支架。结合Geomagic和Rhino软件,通过ANSYS Workbench进行仿真及拓扑优化设计,基于模型的拓扑优化结果,对remove部分进行蜂窝形孔洞填充,减轻重量。并对模型进行工程受力验证,对比优化前后支架承受载荷能力。测试结果表明,创新地提出的分块式脊柱侧凸支架在设定一定约束的条件下和保证支架矫正功能的情况下,拓扑优化结构可以达到轻量化的功能,减重达到8.36%,拓扑优化后前胸板承受载荷能力为原始结构的97.61%,后背板为96.62%。Aiming at the production of idiopathic scoliosis support which has a long processing cycle and needs modulus of mud in patients, and the machining process is very long. Some measures should be taken to solve these problems. The selective sintering 3 D printing technology is applied to the manufacturing of idiopathic scoliosis support. After testing, the selective sintering technology can greatly shorten the processing time of the support, reduce the processing steps, and have certain advantages in testing the scaffolds morphology, and improve the efficiency of manufacturing of idiopathic scoliosis support. The patient is scanned mainly by means of a hand-held scanner, and a segmented scoliosis correction support is established based on the scan result. Combining Geomagic and Rhino software, simulation and topology optimization design through ANSYS Workbench, based on the topology optimization results of the model, the remove part is filled with honeycomb holes filling to reduce weight. The model is subjected to engineering stress verification, and the bearing capacity of the support before and after optimization is compared. The test results show that the innovatively proposed segmented scoliosis support can achieve lightweight function under the condition of setting certain constraints and ensuring the correcting function of the support. The topology optimization structure can achieve the weight reduction function, and the weight loss reaches 8.36%. After topological optimization, the load capacity of the front chest plate is 97.61% of the original structure, and the back plate is 96.62%.

关 键 词：选择性激光烧结 脊柱侧凸 医疗护具 拓扑优化 数值模拟 

分 类 号：O436[机械工程—光学工程]