【摘要】 本文从下尿道内尿液流动问题的生理背景出发建立起相应的可塌陷管的力学分析模型。通过对此模型的分析发现在P_n—Q_n特征曲线的正、负斜率区域内可塌陷管都可能产生自激振荡,从而拓广了Conrad,Griffiths和Conrad,Cohen及MeQueen等作者得出的只有在P_n—Q_n特征曲线具有负斜率时才会出现自激振荡的结论。本文通过数值计算详细讨论了前列腺肿胀对下尿道内尿液流动参量的影响情况。结果表明,有可能根据膀胱压和出口速度等的变化推测前列腺的肿胀情况,从而为前列腺肿胀提供一种理论上的检测和诊断的方法。更多还原

【Abstract】 In this paper an analytic model corresponding to the collapsible tube for analysing the urinary flow in lower-urinary-tract is set up from physiologic background. By analysing the model it is found that the self-excited oscillations can occur in the region of both negative and positive slopes of Pn - Qn characteristic. So this paper extends the results of Conrad[1], Grif fithst[2], Conrad, Cohen and McQueen[3] and others that the self-excited oscillations can only occur in the region of negative slope of Pn-Qn characteristic. The effects of prostatic hypertropy on the flow parameters in lower-urinary-tract is discussed in detail by numerical calculations. The results show that it is possible to know the conditions of prostatic hypertropy according to the changes of bladder pressure, outlet urinary velocity and other parameters. From these results a theoretical method to detect and diagnose prostatic hypertropy is provided.更多还原