| 摘要 |
<p>A circular sample tray is provided for a photo-optical clot detection apparatus. The sample tray includes a flat tray formed of a transparent thermoforming plastic material with an inner circular array of cuvettes formed about the center of the tray and extending out of the plane thereof. An outer circular array of cuvetts is formed concentric with the inner array of cuvettes and is radially aligned therewith, and extends out of the plane of the tray. Radial ribs extend between radially aligned inner and outer cuvettes. The radial ribs are joined by an outer circular rib extending around and of a greater diameter than the outer circular array of cuvettes. The radial ribs are further joined at their innermost end by an inner circular rib having a smaller diameter then the diameter of the inner circular array of cuvettes. The circular test tray is made by vacuum forming techniques to provide cuvettes having uniform wall thicknesses. The photooptical clot detection apparatus used with this circular sample tray is a dual channel photo-optical clot detection machine is provided. The automatic dual channel operation provides a fixed time for activated partial thromboplastin time tests so that fixed incubation times for the tests can be obtained. The samples to be tested are 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. A single light source is placed between the radially spaced cuvettes to provide a common light source for two separate detectors measuring the clot times of samples in the pair of adjacent cuvettes.</p> |
