胎儿肺成熟度羊水滴量仪的研制与应用

Study and Application on the Device of the Drop Volume of Amniotic Fluid in Estimating Fetal Lung Maturity

羊水滴量仪是根据羊水液体表面张力的大小与羊水中表面活性物质的浓度成反比的原理，采用比较法和光电计时计数法，测量羊水从滴管中滴落的液滴间隔时间，从而估算出胎儿的肺发育成熟度。该仪器对１４８ 例羊水进行了测试，并与生化法测试结果进行对照，其符合率达到９３％ 。

A novel device of drop volume of amniotic fluid has been made to estimate fetal lung maturity. The design of the device is based on the principle that the surface tension of amniotic fluid is inversely proportional to the quantity of surfactant in the solution. The device measures the falling time of fluid drops from drop tube and estimates the fetal lung maturity by using the method of comparison and electric optic timing counting. 148 samples of amniotic fluid were measured by the device and the data were compared with those obtained by biochemical method. The results demonstrate that this device has high stability and accuracy, and the rate of agreement between the two methods is as high as 93%.