冲击波负压作用下家兔胸部动力学响应的观察

Observation on the Dynamic Responses of the Thorax of Rabbits to the Underpressure

本实验采用微型加速度传感器和压阻式压力传感器分别测量冲击波负压作用下家兔胸壁加速度和胸内压,由部分加速度曲线积分获得速度和位移曲线.实验结果表明,在冲击波负压作用时,胸壁外向运动的最大加速度为100g数量级,扩张速度约为0.5m/s,扩张位移约为1mm,胸壁运动无明显的再压缩过程;胸内压首先表现为负压,然后伴随一定强度的正压,提示可能产生肺与胸壁相互撞击.

The techniques, such as the measurements of the acceleration on the chest wall, intra梩ho-racic pressure were used in this study to testify the hypothesis on the injury mechanisms of the underpressure. The experimental results showed that the chest wall of the rabbits expanded outward in the exposure to the underpressure with lower acceleration, velocity and displacement, and the expansion of the chest wall es-tablished the pressure differential in the both sides of the lui(?)gs, which impulsed the lungs to move outward. The maximal values of the acceleration, velocity and displacement in the expansion of the chest wall were 100g, 0. 5m/s and 1mm, respectively. The corresponding intra-thoracic pressure was characterized by the negative component and subsequently, the positive one. which also indirectly evidenced the impact of the lungs on the chest wall.