中国医学物理学杂志
中國醫學物理學雜誌
중국의학물이학잡지
CHINESE JOURNAL OF MEDICAL PHYSICS
2009年
6期
1536-1539
,共4页
刘盛雄%尹志勇%赵辉%杨光瑜
劉盛雄%尹誌勇%趙輝%楊光瑜
류성웅%윤지용%조휘%양광유
颅脑%减速碰撞%对冲伤%空化
顱腦%減速踫撞%對遲傷%空化
로뇌%감속팽당%대충상%공화
brain%deceleration impact%contrecoup injury%cavitation
目的:构建一种新的方法用于再现颅脑减速撞击过程中对冲部位的空化效应.方法:制作含微气泡的透明颅脑物理模型,并将其安放在竖式颅脑减速撞击移动平台上.在高强度灯光的照明环境中,将移动平台以40 cm的高度自由下落而撞击固定台面,同时采用高速摄像记录减速撞击的整个过程.之后用序列图片分析软件计算微气泡的体积与平均压力的变化,研究碰撞过程中脑组织的空化效应.结果:位于撞击对侧的微气泡在撞击过程中其体积明显增大,位于撞击侧的微气泡在撞击过程中其体积减小,位于中性点的微气泡在撞击过程中其体积增减不明显.结论:该实验结果表明颅脑对冲部位出现了负压,存在空化现象.清晰直观地再现了颅脑减速撞击过程中对冲部位的空化效应.有助于在一定程度上较好地认识颅脑减速撞击过程中脑组织内动态应力的分布特点,为阐明交通事故伤中较为常见的颅脑"对冲伤"的力学发生机制提供一定的方法和实验基础.同时该方法对于研究颅脑减速撞击损伤的致伤机理及其诊断和防护具有重要意义.
目的:構建一種新的方法用于再現顱腦減速撞擊過程中對遲部位的空化效應.方法:製作含微氣泡的透明顱腦物理模型,併將其安放在豎式顱腦減速撞擊移動平檯上.在高彊度燈光的照明環境中,將移動平檯以40 cm的高度自由下落而撞擊固定檯麵,同時採用高速攝像記錄減速撞擊的整箇過程.之後用序列圖片分析軟件計算微氣泡的體積與平均壓力的變化,研究踫撞過程中腦組織的空化效應.結果:位于撞擊對側的微氣泡在撞擊過程中其體積明顯增大,位于撞擊側的微氣泡在撞擊過程中其體積減小,位于中性點的微氣泡在撞擊過程中其體積增減不明顯.結論:該實驗結果錶明顱腦對遲部位齣現瞭負壓,存在空化現象.清晰直觀地再現瞭顱腦減速撞擊過程中對遲部位的空化效應.有助于在一定程度上較好地認識顱腦減速撞擊過程中腦組織內動態應力的分佈特點,為闡明交通事故傷中較為常見的顱腦"對遲傷"的力學髮生機製提供一定的方法和實驗基礎.同時該方法對于研究顱腦減速撞擊損傷的緻傷機理及其診斷和防護具有重要意義.
목적:구건일충신적방법용우재현로뇌감속당격과정중대충부위적공화효응.방법:제작함미기포적투명로뇌물리모형,병장기안방재수식로뇌감속당격이동평태상.재고강도등광적조명배경중,장이동평태이40 cm적고도자유하락이당격고정태면,동시채용고속섭상기록감속당격적정개과정.지후용서렬도편분석연건계산미기포적체적여평균압력적변화,연구팽당과정중뇌조직적공화효응.결과:위우당격대측적미기포재당격과정중기체적명현증대,위우당격측적미기포재당격과정중기체적감소,위우중성점적미기포재당격과정중기체적증감불명현.결론:해실험결과표명로뇌대충부위출현료부압,존재공화현상.청석직관지재현료로뇌감속당격과정중대충부위적공화효응.유조우재일정정도상교호지인식로뇌감속당격과정중뇌조직내동태응력적분포특점,위천명교통사고상중교위상견적로뇌"대충상"적역학발생궤제제공일정적방법화실험기출.동시해방법대우연구로뇌감속당격손상적치상궤리급기진단화방호구유중요의의.
Purpose: Set up a new technique to reproduce the cavitation effect in the process of brain deceleration impact Methods: A transparent physical brain model with tiny air bubbles was built and loaded on an upright brain deceleration impacting moveable platform. Then, in the high strength lighting circumstance, the moveable platform was made to free fall from a height of 40cm and impacted on a fixed platform, and the whole deceleration impacting process was recorded by a high-speed video camera. Using the serial pictures analysing software, the volume and mean pressure change of the air bubbles were calculated and the cavitation effect of the brain tissue during the impact was studied. Results: The volume of the air bubble in the contrecoup site increased obviously in the impacting process, the volume of the air bubble in the coup site decreased in the impacting process and the volume change of the air bubble in the middle site was not evident enough in the impacting process. Conclusion: The results proved the negative pressure and the cavitation phenomenon in the contrecoup site. The experiments explicitly and directly showed the cavitation effect in the contrecoup site during the decelerating impact It was helpful to better understand the distribution characters of the dynamic stress of the brain tissue in the brain decelerating impact in a certain extent, and it could also provide some methods and experimental foundation to clarify the mechanical mechanism of the brain "contrecoup injury" which was often taken place in traffic accidental injury. Besides, the methods were of significance to research the biomechanism, diagnosis and prevention of the brain deceleration impacting injury.