人工心脏瓣膜返流量的非定常流测量方法研究  

Study on Unsteady-flow Method for Measuring the Regurgitant Volume of Cardiac Valve Prostheses

作　　者：魏列江[1] 魏中英 冀宏[1] 李少年[1] 强彦[1] 

机构地区：[1]兰州理工大学流体动力与控制学院,兰州730050 [2]兰州兰飞医疗器械有限公司,兰州730070

出　　处：《中国生物医学工程学报》2008年第2期293-296,302,共5页Chinese Journal of Biomedical Engineering

基　　金：国家自然科学基金资助项目(50605030);甘肃省自然科学基金资助项目(X06200401)

摘　　要：为简化人工心脏瓣膜返流量测量装置的结构,降低测试成本,提出了用非定常流等效定常流进行人工心脏瓣膜返流量测量的新方法,推导出了非定常流等效定常流测量时的水头适用条件,利用流体力学拉格朗日积分建立了非定常流的非线性微分方程并进行了数值解析,分析了该方法的理论测量误差。计算和实验表明:在满足水头适用条件且瓣膜反向过流面积与测试管截面积比值小于3.422%时,非定常流测量方法实际测量精度可保证在2.27%以内。该方法的提出对于以非定常流等效定常流方法进行人工心脏瓣膜返流量测量系统的设计提供了理论依据。To simplify the structure of measuring equipment and reduce its cost, a new method for measuring the regurgitant volume of cardiac valve prostheses was presented. The measuring method used unsteady flow instead of steady flow, deducted the elevation condition for application （ECA） of the method, established nonlinear differential equations of unsteady flow by Lagrange integral. The measurement error was analyzed. The experimental results showed that the measuring precision was about 2.27 % under the condition that ECA and the ratio of cross sectional areas of valve and test tube was smaller than 3.422 %. The proposed method offers an academic foundation for the design of a test system to measure the regurgitant volume of cardiac valve prostheses.

关 键 词：人工心脏瓣膜 返流量 非定常流 测量方法 精度 

分 类 号：R318.08[医药卫生—生物医学工程]