椎体模型内模拟注射PMMA的流动及分布规律

Law of PMMA flowing and distributing in the vertebra by computer modeling

目的:探寻骨水泥在椎体内的流动及分布规律,为临床椎体成形术提供操作的理论基础.方法:根据正常成人椎体的结构特性和参数运用计算机软件构建相应的多孔介质的椎体模型,并运用流体力学的方法进行数值模拟和分析与骨水泥粘度相当的硅油在椎体模型中的流动及分布规律.结果:硅油在模拟的椎体模型内的各个平面上呈类圆形分布,位于通过注射点的平面面积最大,在每个平面上从中心向外,硅油的体积分数逐渐降低.结论:模拟骨水泥在椎体内的流动分布规律:以注射点为圆心,在经过注射点的各个平面上,向各个方向呈类圆形流动分布,成为一个类球体的结构.

AIM： To investigate the law that PMMA （polymethyl methacrylate） flows and distributes in the vertebra so as to lay the operational theoretical foundation for the clinical work of percutaneoas vertebroplasty. METHODS： Based on the structural characteristics and parameters of the healthy adult vertebra, a vertebral model of porous media was made by the computer software and the law that silicone oil with a viscosity matching that of PMMA flew and distributed in the model was calculated and analyzed by means of hydrodynamics and numeric modeling. RESULTS ： The silicone oil distributed in a circle-like shape on each plane in the vertebral model, and the largest amount was on the planes through the injection point. The volume fraction of the silicone oil decreased from the center of planes to outward on each plane. CONCLUSION： The law that PMMA flows and distributes in the vertebral model was to spread in all directions in a circle-like shape on the planes through the injection point as a centre and it finally became a ball-like shape as a whole.