Abstract: A dual channel photo-optical clot detection system for the automatic determination of prothrombin times and activated partial thromboplastin times and other related coagulation tests. A circular tray is utilized, and is vacuum formed to provide cuvettes having uniform wall thicknesses in two circular paths and arranged with radially aligned cuvettes. A single light source is placed between the radial spaced cuvettes and thus provides a common source for two separate detectors measuring the clot time of samples in each cuvette. The automatic dual channel operation provides a fixed time for activated partial thromboplastin time test so that fixed incubation time for the tests can be obtained. Thus, the sample to be tested is maintained at a low temperature until only two stations before measurement, and, accordingly, fixed incubation periods can be determined and exact conditions can be maintained for accurate testing.

Abstract: A self-contained vacuum aspirator system is disclosed which comprises a container having a vacuum applied therein; a valve assembly secured to said container for selectively allowing the passage of fluid into said container; a curette in communication with an aperture in said valve assembly; and an air permeable collection means supported within said container by the aforementioned valve assembly in communication with an opening in said valve assembly for accumulating matter collected by said currette when the valve assembly is operating to establish communication between the aforementioned aperture and opening.