Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications
Development and validation of a 3D-printed interfacial stress sensor for prosthetic applications
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DOI：
10.1016/j.medengphy.2014.10.002
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发表时间：
2015-01-01
影响因子：
2.2
通讯作者：
Zahedi, S.
中科院分区：
文献类型：
--
作者：
Laszczak, P.;Jiang, L.;Zahedi, S.
介绍了一种用于监测下肢截肢者残肢界面机械应力的新型电容式传感器。它提供了同时测量压力和剪应力的实用手段。特别是，它包括一个灵活的框架（20毫米× 20毫米），厚度为4毫米。通过在制造中采用快速成型技术，它提供了一种低成本和通用的解决方案，能够采用定制的下肢残肢形状。该传感器首先使用有限元分析（FEA）进行分析，然后使用基于实验室的机电测试进行评估。结果证实，该传感器能够监测压力和剪切应力分别高达350kpa和80kpa。建立了一个后信号处理模型，分别诱导压力和剪切应力。压力和剪切信号的有效分离可能对临床应用中的传感器校准具有潜在的优势。该传感器还显示出高线性度(约。5-8%)和高压(约。1.3 kPa)和剪切(约0.6 kPa)应力分解性能。因此，该传感器作为一种辅助工具提供了开发的潜力，既可以在临床环境中评估义肢窝的安装，也可以在家庭环境中提醒截肢者残肢窝界面的过度负荷，有效地防止残肢组织在早期阶段破裂。(c) 2014年项目。Elsevier Ltd.出版。版权所有。
A novel capacitance-based sensor designed for monitoring mechanical stresses at the stump socket interface of lower-limb amputees is described. It provides practical means of measuring pressure and shear stresses simultaneously. In particular, it comprises of a flexible frame (20 mm x 20 mm), with thickness of 4mm. By employing rapid prototyping technology in its fabrication, it offers a low-cost and versatile solution, with capability of adopting bespoke shapes of lower-limb residua. The sensor was first analysed using finite element analysis (FEA) and then evaluated using lab-based electromechanical tests. The results validate that the sensor is capable of monitoring both pressure and shear at stresses up to 350 kPa and 80 kPa, respectively. A post-signal processing model is developed to induce pressure and shear stresses, respectively. The effective separation of pressure and shear signals can be potentially advantageous for sensor calibration in clinical applications. The sensor also demonstrates high linearity (approx. 5-8%) and high pressure (approx. 1.3 kPa) and shear (approx. 0.6 kPa) stress resolution performance. Accordingly, the sensor offers the potential for exploitation as an assistive tool to both evaluate prosthetic socket fitting in clinical settings and alert amputees in home settings of excessive loading at the stump socket interface, effectively preventing stump tissue breakdown at an early stage. (C) 2014 IPEM. Published by Elsevier Ltd. All rights reserved.