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针对血管内介入手术模拟建模与碰撞消除方法存在的不足,提出了一种多体-双层的导管/导丝组合体模型及基于几何分析和旋转角传播的快速碰撞消除方法,并开发了一个实时的三维介入手术模拟系统,模拟导管/导丝在实际血管中的运动行为.该多体-双层模型由若干分段组成,每一分段代表了一段导丝、导管或两者兼有的组合体,导丝和导管的半径定义不同,材料属性不同,但每一分段长度相同.模型的运动通过碰撞检测和消除加以引导,抵达目标位置后对该模型施加松弛过程使其状态与实际状态更加吻合.实验结果表明,导管/导丝模型的运动状态与给定的材料参数密切相关,模拟可以达到实时的要求,方法可靠有效,有望应用于临床.
Aiming at the shortcomings of the simulation modeling and the collision elimination method of endovascular interventional surgery, a multi-body-bilaterally combined catheter / guidewire model and a rapid collision elimination method based on geometric analysis and rotation angle propagation were proposed. A real-time, three-dimensional interventional simulation system simulates the movement of a catheter / guidewire in an actual blood vessel. The multibody-bilayer model consists of several segments, each segment representing a length of guidewire, catheter, or both Some combinations, guides, and catheters have different radii, different material attributes, but the same length for each segment.The motion of the model is guided by collision detection and elimination, and upon reaching the target location, relaxation is applied to the model to make its state Which is more consistent with the actual state.Experimental results show that the motion of the catheter / guidewire model is closely related to the given material parameters, and the simulation can meet the real-time requirements. The method is reliable and effective and is expected to be applied to the clinic.