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首页> 外文期刊>International Journal of Solids and Structures >Analysis of an elastic ring tourniquet (ERT) using the theory of a Cosserat curve and finite elements
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Analysis of an elastic ring tourniquet (ERT) using the theory of a Cosserat curve and finite elements

机译：利用COSSERAT曲线理论和有限元的弹性环止血带（ERT）分析

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A-TT(TM) and S-MART(TM) are novel elastic ring tourniquets (ERTs) used for the control of hemodynamic shock and for bloodless surgical procedures on limbs. The ERT device is essentially a silicone ring surrounded by a stockinette sterile gauze. Since the contact pressure applied by the ERT is determined by its geometric and mechanical properties and cannot be adjusted, it is important to develop a mechanical model that can be used to ensure that the contact pressure remains low enough not to cause local tissue damage. Although the calculation of the contact pressure applied by a silicone ring seems to be a simple classical problem, it is shown that the accurate prediction of this contact pressure requires analysis of a number of complicating features, which are related to nonlinear geometric and material influences. This paper presents a hierarchy of mechanical models which include: a simple strength of materials model; models based on the theory of a Cosserat curve and a generalized string (which includes deformation of the cross-section); exact axisymmetric plane strain nonlinear elasticity; and axisymmetric nonlinear finite element analysis. It is shown that the Cosserat model provides reasonable predictions of the response of the silicone ring. Since numerical simulations with the Cosserat model are much faster than those with the finite element model, the Cosserat analysis is more suitable for optimization of the thickness of the stockinette, which can significantly reduce both the maximum and average contact pressures applied by the ERT on the skin. (C) 2004 Elsevier Ltd. All rights reserved.
机译：A-TT（TM）和S-MART（TM）是用于控制血液动力学休克和肢体无流动手术手术的新型弹性环止血带（ERT）。 ERER设备基本上是由储存无菌纱布包围的硅胶环。由于ORT施加的接触压力由其几何和机械性能决定，因此不能调节，因此开发一种机械模型，可以用于确保接触压力保持足够低，不能引起局部组织损伤。尽管硅胶环施加的接触压力的计算似乎是一个简单的经典问题，但结果表明，这种接触压力的精确预测需要分析许多与非线性几何和材料影响有关的复杂特征。本文介绍了机械模型的层次结构，包括：材料模型的简单强度;基于Cosserat曲线理论的模型和广义串（包括横截面的变形）;精确的轴对称平面应变非线性弹性;和轴对称非线性有限元分析。结果表明，Cosserat模型提供了有机硅环的响应的合理预测。由于具有COSSERAT模型的数值模拟比具有有限元模型的速度快得多，因此Cosserat分析更适合于优化储存液的厚度，这可以显着降低ert施加的最大和平均接触压力皮肤。 （c）2004年elestvier有限公司保留所有权利。

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