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    • 8. 发明授权
    • Method and apparatus for calibrating filters during specimen collection
    • 标本采集过程中校准过滤器的方法和装置
    • US08137642B2
    • 2012-03-20
    • US12482731
    • 2009-06-11
    • Timothy HutchinsSteven ScampiniEric Baur
    • Timothy HutchinsSteven ScampiniEric Baur
    • G01D18/00
    • G01N1/36
    • A bubble point of a combination of a filter and a liquid is calibrated by applying an initial back pressure through the filter toward the liquid; taking a first plurality of measurements of the level of the liquid in the container; calculating a first variance of the first plurality of measurements; and comparing the first calculated variance with a known threshold variance. Then a second plurality of measurements of the level of the liquid in the container is taken; a second variance of the second plurality of measurements is calculated; and the second calculated variance is compared with a known threshold variance. The above described steps are repeated at incrementally increased back pressures until the first and second calculated variances are each greater than or equal to the known threshold variance, which is about 0.01. The bubble point is determined to be the back pressure at that point. If the determined bubble point is less than or equal to the known threshold bubble point, which is about 0.8 pounds per square inch, the filter is identified as unsuitable for use in cell block formation.
    • 过滤器和液体的组合的起泡点通过将初始的背压通过过滤器朝向液体进行校准; 对容器中液体的水平进行第一次多次测量; 计算所述第一多个测量的第一方差; 以及将第一计算的方差与已知的阈值方差进行比较。 然后取出容器中的液体水平的第二多个测量值; 计算第二多个测量的第二方差; 并将第二计算方差与已知的阈值方差进行比较。 上述步骤以逐渐增加的背压重复,直到第一和第二计算的方差各自大于或等于已知阈值方差,其为约0.01。 泡点确定为此时的背压。 如果确定的气泡点小于或等于已知的阈值气泡点(约0.8磅/平方英寸),则过滤器被识别为不适合用于细胞块形成。