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目的探讨密闭舱室内大鼠胸部对不同大小爆炸冲击波的动力学响应过程,分析胸壁的粘弹性运动过程及其与伤情间的关系。方法在密闭舱室内用不同当量的点爆源爆炸对大鼠致伤,采用REDLAKE-HE高速摄影机观察胸壁的运动情况,记录冲击波超压,分析大鼠损伤的伤情。结果胸部变形量、胸壁向内最大速度与损伤严重程度指数ASⅡ有一定的相关性(r=0.96778,P=0.03222;r=0.96881,P=0.03119)。胸壁运动对内部器官造成损伤机制主要是粘性损伤机制。结论胸壁的变形运动过程是造成胸部损伤的关键因素之一。密闭舱室内胸壁向内最大速度与损伤严重程度指数ASⅡ有较好的相关关系,是预测冲击伤伤情的可靠参数。
Objective To investigate the dynamic response of the rat chest to the shock waves of different sizes in a closed chamber and to analyze the viscoelastic movement of the chest wall and its relationship with injury. Methods Injury was induced in rats in a closed compartment by explosion with different equivalent exploders. The movement of the chest wall was observed with a REDLAKE-HE camera. The overpressure of the shock waves was recorded and the injury of the rats was analyzed. Results The amount of chest deformation and maximal velocity of chest wall were correlated with ASII (r = 0.96778, P = 0.03222; r = 0.96881, P = 0.03119). Chest wall movement on the internal organs damage caused by viscous injury mechanism is mainly. Conclusion The chest wall deformation process is one of the key factors causing chest injury. The maximum inboard velocity of chest wall in aseptic compartment is related to ASII, which is a reliable parameter to predict the impact of injury.