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首页> 外文期刊>Journal of Biomechanics >A finite element analysis of the retinal hemorrhages accompanied by shaken baby syndrome/abusive head trauma.
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A finite element analysis of the retinal hemorrhages accompanied by shaken baby syndrome/abusive head trauma.

机译：伴有摇晃的婴儿综合症/虐待性头部创伤的视网膜出血的有限元分析。

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摘要

We aimed to elucidate the mechanism of the retinal hemorrhage (RH) accompanied by shaken baby syndrome or abusive head trauma (SBS/AHT) by analyses using a computational model. We focused on a hypothesis that the vitreoretinal traction due to acceleration and deceleration caused by abusive shaking leads to retinal hemorrhage. A finite element (FE) mechanical model with simple spherical geometry was constructed. When the FE mechanical model was virtually shaken, the intensity of the stress applied to the retinal plane agreed well with the results from an analysis using a physical model made of agar gel. Impacts due to falling events induced more intensive tensile stresses, but with shorter duration, than the shake did. By applying a mathematical theory on tackiness, we propose a hypothesis that the time integration of the stress, in the unit of Pa·s, would be a good predictor of the RH accompanied by SBS/AHT. A single cycle of abusive shake amounted to 101Pa·s of time integration of inflicted stress, while a single impact event amounted to 36Pa·s. This would explain the paradoxical observation that shaking induces RH while RH due to impact events is only seen in a major event such as a fatal motor vehicle accident.
机译：我们的目的是通过使用计算模型进行分析，阐明伴有摇晃的婴儿综合症或虐待性颅脑外伤（SBS / AHT）的视网膜出血（RH）的机制。我们集中在一个假设，即滥用震动引起的加速和减速引起的玻璃体视网膜牵引导致视网膜出血。构造了具有简单球形几何形状的有限元（FE）力学模型。当FE机械模型实际上被震荡时，施加到视网膜平面上的应力强度与使用琼脂凝胶制成的物理模型的分析结果非常吻合。与坠落相比，坠落事件引起的冲击会产生更大的拉伸应力，但持续时间较短。通过应用关于粘性的数学理论，我们提出一个假设，即以Pa·s为单位的应力时间积分将是伴随SBS / AHT的RH的良好预测指标。单个晃动摇动周期相当于所施加应力的时间积分为101Pa·s，而单个冲击事件则为36Pa·s。这可以解释自相矛盾的观察结果，即晃动会诱发RH，而由于撞击事件引起的RH仅在重大事件（例如致命的汽车事故）中才能看到。

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