Simulation and experimental studies in needle-tissue interactions
Simulation and experimental studies in needle-tissue interactions
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DOI：
10.1007/s10877-016-9909-6
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发表时间：
2017-08-01
影响因子：
2.2
通讯作者：
Hutapea, Parsaoran
中科院分区：
文献类型：
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作者：
Konh, Bardia;Honarvar, Mohammad;Hutapea, Parsaoran
这项工作旨在引入一种新的针插入模拟来预测软组织内斜尖针的偏转。这种模型的开发可以预测针在针与组织相互作用过程中的转向行为，可以通过针朝向目标的虚拟路径规划和训练系统来提高许多基于经皮针的手术（例如近距离放射治疗和热消融）的性能，从而减少临床实践中可能发生的并发症。 LS-DYNA 软件中的任意拉格朗日欧拉 (ALE) 公式用于模拟针与组织之间的固液相互作用。由于该模型需要考虑连续体的大变形和断裂，因此应用 ALE 方法进行流体分析被认为是一种合适的方法。由于其不对称斜角尖端上的相互作用力，使用 150 毫米长的针在组织内弯曲。在软体模中进行了三个针转向实验案例来验证模拟。模拟预测的偏转与实验中观察到的偏转之间的误差测量值小于 10%，从而以合理的精度验证了我们的方法。使用该模型研究了针直径及其斜角对针最终形状的影响。为了绕过人体的解剖障碍并到达目标位置，建议使用细而锋利的针，因为它们会产生较小的曲率半径。这项工作中提出的插入模型旨在用作未来研究的路径规划和培训目的的基础结构。
This work aims to introduce a new needle insertion simulation to predict the deflection of a bevel-tip needle inside soft tissue. The development of such a model, which predicts the steering behavior of the needle during needle-tissue interactions, could improve the performance of many percutaneous needle-based procedures such as brachytherapy and thermal ablation, by means of the virtual path planning and training systems of the needle toward the target and thus reducing possible incidents of complications in clinical practices. The Arbitrary-Lagrangian-Eulerian (ALE) formulation in LS-DYNA software was used to model the solid-fluid interactions between the needle and tissue. Since both large deformation and fracture of the continuum need to be considered in this model, applying ALE method for fluid analysis was considered a suitable approach. A 150 mm long needle was used to bend within the tissue due to the interacting forces on its asymmetric bevel tip. Three experimental cases of needle steering in a soft phantom were performed to validate the simulation. An error measurement of less than 10 % was found between the predicted deflection by the simulations and the one observed in experiments, validating our approach with reasonable accuracy. The effect of the needle diameter and its bevel tip angle on the final shape of the needle was investigated using this model. To maneuver around the anatomical obstacles of the human body and reach the target location, thin sharp needles are recommended, as they would create a smaller radius of curvature. The insertion model presented in this work is intended to be used as a base structure for path planning and training purposes for future studies.