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Strength Evaluation and Modification of a 3D Printed Anterior Ankle Foot Orthoses
Applied Sciences ( IF 2.838 ) Pub Date : 2020-10-18 , DOI: 10.3390/app10207289
Yi-Chen Lin , Li-Ying Huang , Chen-Sheng Chen

Ankle foot orthosis (AFO) is widely used to prevent foot drop and improve walking ability for individuals with cerebral palsy and stroke. However, traditional anterior AFO (TAAFO) could only last within months because the bilateral neck of TAAFO was easy to break. Currently, a 3D-printing technique is used to develop assistive devices for rehabilitation. The study aimed to implement the finite element (FE) method to revise the 3D printed AAFO (3DP-AAFO) and evaluate its strength. A 3.2 mm-thickness for the TAAFOs and 3DP-AAFOs were fabricated, respectively. The stiffness of TAAFO and 3DP-AAFO were tested by a material machine and compared to the FE model. In the FE analysis, the thickness of AAFO model was increased at the neck to enhance its strength. A plantarflexion and dorsiflexion moment were respectively subjected to 3DP-AAFO models to undergo stress analysis. Under the mechanical test, the 3DP-AAFO (K = 1.09 Nm/degree) was 7.8 times stiffer than the traditional AAFO (K = 0.14 Nm/degree). The FE results showed that thickening the 3DP-AAFO on the neck up to 4.7 mm could moderate stress concentration and increase the stiffness of the 3DP-AAFO. Therefore, the study concluded that the 3DP-AAFO was stiffer than the traditional AAFO. Increasing the appropriate thickness around neck of 3DP-AAFO could avoid neck fracture as much as possible.

中文翻译:

3D打印前踝足矫形器的强度评估和修改

踝足矫形器(AFO)被广泛用于防止脚瘫痪并改善患有脑瘫和中风的人的行走能力。但是,传统的前AFO(TAAFO)只能持续数月之久,因为TAAFO的双侧脖子很容易折断。当前,使用3D打印技术来开发用于康复的辅助装置。该研究旨在实施有限元(FE)方法以修改3D打印AAFO(3DP-AAFO)并评估其强度。TAAFO和3DP-AAFO的厚度分别为3.2毫米。TAAFO和3DP-AAFO的刚度通过材料机器进行了测试,并与FE模型进行了比较。在有限元分析中,AAFO模型的厚度在颈部增加,以增强其强度。足底屈曲和背屈力矩分别经过3DP-AAFO模型进行应力分析。在机械测试下,3DP-AAFO(K = 1.09 Nm /度)比传统AFO(K = 0.14 Nm /度)强7.8倍。有限元分析结果表明,将3DP-AAFO颈部增厚至4.7 mm可以减轻应力集中并增加3DP-AAFO的刚度。因此,研究得出的结论是3DP-AAFO比传统AAFO坚硬。在3DP-AAFO的颈部周围增加适当的厚度可以尽可能避免颈部骨折。7 mm可以缓和应力集中并增加3DP-AAFO的刚度。因此,研究得出的结论是3DP-AAFO比传统AAFO坚硬。在3DP-AAFO的颈部周围增加适当的厚度可以尽可能避免颈部骨折。7 mm可以缓和应力集中并增加3DP-AAFO的刚度。因此,研究得出的结论是3DP-AAFO比传统AAFO坚硬。在3DP-AAFO的颈部周围增加适当的厚度可以尽可能避免颈部骨折。
更新日期:2020-10-19
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