Experimental Study On Dogs Neck Vascular Injury In Indirect Firearm Injury

Objective:Tbe wide application of blastic weapons in the modem wars has given many opportunities for the reserch of traumatic trajectory. A new maxillofacial and cervical traumatic model is found in this experiment to observe the dog major vessel pathology by light and electron microscope following fire-ann injury. Method: The impact wave was simulated by detonator in the distance of 10cm over masseter, and the edge or penetration injury of cervical skin and muscle was made by rifle to imitate segments in blast. Results: The cervical common artery and external jugular vein was injuried in different extent by the action of blast-segments, simple blast or bullet. the rough endothelia, thombosis, elastic layer broken and imflammatory infiltration in the middle and external layer of vessels could be found under microscope. Under electric microscope, deterioration and necrosis were the main changes. Conclusion: thrombosis reached to extreme at 24h after indirect firearm injury. The injuiy endotheliurn in the distance of 1cm from the wound track was more severe than the other distances in which there no apparently difference in injury extent the endothelium and middle layer. The breaking of internal and middle layer intended to form hernia of the external layer. This can be the theoretic evidence for the reserch of pseudoaneurysm formation in clinic, after indirect firearm wound. There is no apparent difference in the pathological changes of external jugular vein by the action between the blast- segments and simlple blast. The pathology of vessels injuried by blast- segments is similar to that injuned by simple segments, but the premier is more widely and severer. In this experiment, the common carotid artery was still found injuried in the place of 14cm away from the detonator., the cervical artery was injuried also within the range of 3cm from the wound track among the gunshot wound animals.