低频振动作用下人体椎间盘多孔弹性单元的研究  

Analysis on poroelastic of human interertebral disc under the low frequency vibration circumstances

作　　者：李睿[1] 郭立新[1] 

机构地区：[1]东北大学机械工程与自动化学院,沈阳110819

出　　处：《应用力学学报》2013年第4期635-640,654,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51275082;51135003);高等学校博士学科点基金(20100042110013);中央高校基本科研业务费(N110403008)

摘　　要：建立了L4/L5段人体腰椎关节的非线性多孔弹性单元有限元模型,并对该模型进行了轴向静力(0Hz)和低频(0.01 Hz、0.1 Hz、0.5 Hz、1 Hz)振动作用各1小时的仿真研究,对比了在不同频率振动作用下人体脊椎组织的多孔弹性单元力学特性。结果表明:在相同振幅和时间内,与低频(0.01Hz、0.1Hz)相比,相对较高频率(0.5 Hz、1 Hz)作用下的椎间盘组织产生的轴向位移较大,髓核和纤维环的孔压应力均呈现逐渐上升的趋势;与此同时,髓核的有效应力逐渐增加,而纤维环的有效应力却逐渐减少;在相对较低频率(0.01Hz、0.1Hz)作用下的各项力学特性指标与静力作用下的相比,差值均在3%以下;加载时间超过600s后,振动频率的增加更容易使椎间盘轴向位移增大;相对较高频率(0.5 Hz、1 Hz)振动作用下髓核和纤维环内的孔压值逐渐升高,而静力压缩和相对较低频率(0.01 Hz、0.1 Hz)振动作用下孔压值却逐渐降低;不断增加的孔压应力使椎间盘内的体液流失速率变大,导致椎间盘退化。A nonlinear poroelastic finite element model of human intervertebral disc is developed firstly,and the axial static compression load（0 Hz） and low frequency（0.01 Hz,0.1 Hz,0.5 Hz,1 Hz） vibration compression load is applied on the disc each for 1 hour,and the biomechanical characteristics under different frequency vibration load are comparatively analyzed.Results obtained show that,under the same loading amplitude and loading time,the issue appeared larger axial displacement on higher frequency（0.5 Hz,1 Hz） loading conditions than static and lower frequency（0.01 Hz,0.1 Hz） conditions.Meanwhile,on the higher frequency（0.5 Hz,1 Hz） conditions,the pore pressure of nucleus and annulus reveal increasing trend,and the effective stress of nucleus appears increasing while the effective stress of annulus decreasing.However,on lower frequency（0.01 Hz,0.1 Hz） conditions various mechanical properties index are similar to those on the static loading condition.After 10 minutes loading,the increase of the frequency of the vibration makes the intervertebral disc axial displacement increase more easily.The high frequency（0.5 Hz,1 Hz） vibration load makes the pore pressure of the nucleus and the annulus increase,while makes the value decrease under the static and the low frequency（0.01 Hz,0.1 Hz）.The increasing pore pressure makes the body fluids in the intervertebral disc loss fast which result in intervertebral disc degenerates more easily.

关 键 词：人体椎间盘 多孔弹性单元 低频振动 有限元分析 

分 类 号：TB17[生物学—生物工程]