Distribution And 3-D Reconstruction Of Intrathoracic Stress In The Swine Chest Subjected To Impact

Traffic accident is the NO.1 public threat in the modern civilized society. About 56% of the casualty in the traffic accidents have accompanied chest impact injury, which ranks as the second cause of death in traffic accidents. After impact injury to the chest, people may die in a very short time because of severe pulmonary and cardiac injury or seriously wounded large vessels. Although some of them manage to be transferred to the hospital, many would suffer secondary pulmonary injury, which results in respiratory dysfunction and leads to death or other critical conditions. Lung is a special organ with tissue elasticity and gas elasticity. Sound velocity in the lung tissue is very slow and is 1/10 of that in air. Therefore, when the lung is subjected to high speed impact, the stress wave which responses inside the lung would cause severe injury in special regions, which in turn generates stronger distortion and stress at some small regions by reflection, refraction and focalization. Moreover, owing to the irregular configuration of the thorax and lung, stress concentration is frequently seen in some specific regions. Mechanical response after thoracic impact injury and its association with tissue injury are still not clear. Thus, it is not easy to ensure accurate diagnosis and evaluation of injury severity and injured regions.Therefore, it is of great significance to study the characteristics of stress response inside the thorax and association between the regions of stress concentration and the severity and regions of pulmonary injury after thoracic impact injury. Firstly, the small pressure-biosensors are planted in different positions in the dexter thorax after thoracotomy to obtain pressure response data inside the thorax at the time of impact. The relationship between the pressure change and lung injury is studied. Secondly, we reconstruct the 3-D finite model of miniature swine's thorax. It simulates and reconstructs the stress response, stress concentration and stress distributing inside the swine thorax by finite analyzed method. The pressure response data is used to validate 3-D finite model. Finally, the thorax anatomization is performed to further explore the association between stress response and...