在齐格扎格形状的支架中分析建模和辐射刚度的验证:实验和数值方法
1Department of Mechanical Engineering and Mechatronics, Ariel University, Ariel, Israel.
概括
这项研究验证了一种分析模型,用于计算状支架和支架移植 (SG) 的辐射刚度 (RS). 经过验证的模型准确地预测RS,有助于设计针对患者的植入物,以减少动脉壁压力和静脉复缩.
科学领域:
- 生物医学工程 生物医学工程
- 材料科学 材料科学 材料科学
- 心血管研究研究心血管研究
背景情况:
- 支架和支架移植 (SG) 在内血管程序中至关重要.
- 支架中高辐射硬度 (RS) 可能导致不良影响,如动脉壁压力增加,复缩,以及需要重新干预.
- 精确预测RS对于优化支架设计和患者结果至关重要.
研究的目的:
- 验证一种分析模型,用于计算状支架和支架移植 (SG) 的辐射刚度 (RS).
- 将模型的预测与实验测量和数值模拟进行比较.
- 建立一种可靠的方法来设计针对个体患者量身定制的RS支架.
主要方法:
- 选择了四种具有不同几何和材料特性的商用SG.
- 使用开发的分析模型计算RS.
- 分析RS预测与实验测量和数值模型结果的比较.
主要成果:
- 在分析模型的RS计算和实验测量之间发现了很好的一致性.
- 预测和测量的RS之间的平均差异为2.4%±3.3%.
- 分析模型在预测SGS的辐射刚度方面表现出很高的准确性.
结论:
- 经过验证的分析模型提供了一个精确的工具,用于确定齐克扎克形状的支架和支架移植的辐射刚度.
- 这种模型有助于设计具有优化RS的支架,从而减少潜在的复发症,如缩.
- 设计具有所需RS的患者特异性支架的能力可以提高内血管程序的疗效和患者的结果.
相关概念视频
01:23Stresses under Combined Loadings
134
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
134
01:18Stress Concentrations in Circular Shafts
153
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
153
01:16Eccentric Axial Loading in a Plane of Symmetry
148
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
148
01:10Residual Stresses in Circular Shafts
140
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
140
01:12Temperature Dependent Deformation
133
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
133
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
229
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
229