Modeling and preliminary testing socket-residual limb interface stiffness of above-elbow prostheses.
Modeling and preliminary testing socket-residual limb interface stiffness of above-elbow prostheses.
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肘部假肢的插座-残肢界面刚度的建模和初步测试。
DOI：
10.1109/tnsre.2008.918388
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Weir,RichardFff
中科院分区：
文献类型：
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作者：
Sensinger,JonathonW;Weir,RichardFff
接受腔和残肢之间的界面对假肢的性能有显著影响。具体而言，在设计新的假肢和评估新的控制范例，以及在比较现有的和新的插座技术的关节窝-残肢（S-RL）接口的旋转刚度的知识是非常有用的。然而，没有以前的研究，研究了S-RL接口的旋转刚度。为了解决这个问题，将数学模型与更复杂的有限元分析进行比较，以查看数学模型是否充分捕获S-RL界面旋转刚度的主要影响。然后将这两种模型与初步的经验测试进行比较，在初步的经验测试中，采用一系列X射线（称为荧光透视）来获得骨相对于牙槽的运动。同时记录力数据，并将力和运动数据结合起来计算肘关节S-RL界面的经验旋转刚度。然后将经验旋转刚度值与模型进行比较，以查看在其他研究中在局部点处获得的杨氏模量值是否可用于确定S-RL界面的全局旋转刚度。调查结果包括模型和实证结果之间的协议和能力的人显着调制的旋转刚度的S-RL接口略小于一个数量级。该范围的下限和上限明显取决于接受腔长度和共收缩水平，但与残肢直径或骨直径无关。对于本研究中测试的四名受试者，测量的经肱骨S-RL界面旋转刚度值范围为24 - 140 Nm/rad。
The interface between the socket and residual limb can have a significant effect on the performance of a prosthesis. Specifically, knowledge of the rotational stiffness of the socket-residual limb (S-RL) interface is extremely useful in designing new prostheses and evaluating new control paradigms, as well as in comparing existing and new socket technologies. No previous studies, however, have examined the rotational stiffness of S-RL interfaces. To address this problem, a math model is compared to a more complex finite element analysis, to see if the math model sufficiently captures the main effects of S-RL interface rotational stiffness. Both of these models are then compared to preliminary empirical testing, in which a series of X-rays, called fluoroscopy, is taken to obtain the movement of the bone relative to the socket. Force data are simultaneously recorded, and the combination of force and movement data are used to calculate the empirical rotational stiffness of elbow S-RL interface. The empirical rotational stiffness values are then compared to the models, to see if values of Young's modulus obtained in other studies at localized points may be used to determine the global rotational stiffness of the S-RL interface. Findings include agreement between the models and empirical results and the ability of persons to significantly modulate the rotational stiffness of their S-RL interface a little less than one order of magnitude. The floor and ceiling of this range depend significantly on socket length and co-contraction levels, but not on residual limb diameter or bone diameter. Measured trans-humeral S-RL interface rotational stiffness values ranged from 24-140 Nm/rad for the four subjects tested in this study.