School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
Med Biol Eng Comput. 2023 Mar;61(3):721-737. doi: 10.1007/s11517-022-02732-8. Epub 2023 Jan 3.
To fully grasp the numerical characteristics of the interaction process between medical waterjet and soft tissue, the smoothed particle hydrodynamics (SPH)-finite element method (FEM) was used in the simulation of this complex process to avoid the unstable error caused by indirect measurement in experiments. The SPH was applied to the numerical simulation of medical waterjet, and a three-dimensional model of gelatin sample was proposed with the FEM. The impact process between two extremely deformed materials was reproduced, and the established model was verified by comparison with experimental data; the comparison showed relatively consistent results. The separation effect under three operating modes was deduced with the stress and strain range. For the vertical impact condition, the higher the waterjet impact pressure is, the higher the biological tissue deformation bulge height is. For oblique intrusion, the longitudinal separation rate decreases and the kerf width increases with the increase of the incident angle. For the moving impact condition, with the increase of the waterjet moving speed, the longitudinal high-stress distribution range of the impact object decreases slightly.
为了充分掌握医用射流与软组织相互作用过程的数值特征，该复杂过程的模拟采用了平滑粒子流体动力学（SPH）-有限元法（FEM），以避免实验中间接测量带来的不稳定误差。SPH 被应用于医用射流的数值模拟，同时提出了一个带有 FEM 的明胶样本三维模型。重现了两种极度变形材料之间的冲击过程，并通过与实验数据的对比验证了所建立的模型；对比结果显示出较为一致的结果。通过应力和应变范围推导出了三种工作模式下的分离效果。对于垂直冲击条件，射流冲击压力越高，生物组织变形凸包高度越高。对于斜向侵入，随着入射角的增加，纵向分离率降低，切缝宽度增加。对于移动冲击条件，随着射流移动速度的增加，冲击物的纵向高应力分布范围略有减小。
