[Device for determining surfactant status by the Pattle method]

An apparatus for determination of the state of the lung surfactant by measuring the stability of air bubles in a hanging drop by Pattle's method is described. Its construction permits multiple photographing of 5 hanging drops in identical areas at any intervals, thereby achieving standardization of the test (microscopy, photography) and shortening its performance. This device allows comparative study of surfactant in different parts of the lung which is particularly important in pathological conditions. It may be used for time-course microscopic examination and microphotography of other biological objects in hanging drops.