在生物材料试验机上模拟手术的缝合操作，研究了缝合针针尖与肝脏组织的交互作用行为；根据针尖刺破组织前后两个阶段的受力分析，建立了刺破前后两个阶段的能量平衡方程；并基于能量平衡方程和特定的刺入试验，研究不同入刺速率、不同针尖截面形状和直径大小的缝合针对组织裂纹扩散时能量耗散的影响。结果表明，随着入刺速度的增加，针刺入肝脏组织后遇到的阻力增大，裂纹扩散时消耗的能量增加；而在在组织刺破的瞬间针尖受到的刺破力却随着速度的增大呈减小趋势。三角形截面、大直径的缝合针由于具有较大的截面面积，在针刺过程中遇到周围组织的阻力较大，因此产生的刺破力较大，针刺过程中消耗的能量较多。
The interactive action between suture needle and liver tissue is investigated by using a biological materials testing machine to simulate the surgical suturing operation. The energy equilibrium equations are established according to the force analysis of the suture needle in the two phases of no tissue break phase and tissue break phase. Based on the energy balance equations and the particular puncture tests, the effects of different insertion velocities, needle cross-section shapes and diameter size on the energy dissipation of crack spread in the liver tissue are studied. The results show that with the increasing insertion velocity, the resistance of needle puncturing its surrounding tissue increases, which results in the energy consumption enhance. However, the puncture force reveals a decrease trend with the increasing insertion velocity. The needles with triangle cross-section tip and larger diameter size show higher resistance against the surrounding tissue, which result in bigger puncture force and more energy consumption in the process of suturing operation.
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