To make an exfoliative cytological diagnosis, the specimens must contain enough cells for examination. To achieve this, a cell aspirator was designed consisting of a disposable syringe connected to a vacuum system and...
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To make an exfoliative cytological diagnosis, the specimens must contain enough cells for examination. To achieve this, a cell aspirator was designed consisting of a disposable syringe connected to a vacuum system and equipped with a cannula. When taking the specimen, physiological saline is applied drop by drop and the fluid is aspirated into the syringe together with the material from the lesion. This suspension is fixed and centrifuged, and the material in the pellet is transferred to a glass slide for staining and diagnosis. This cell aspirator technique produced specimens containing a large number of cells, which is a necessary condition for a reliable cytological diagnosis. An account is given of the results of a comparative histopathologic study of areas of the human oral mucosa in which cytological specimens were collected with a wooden spatula and with a cell aspirator. To judge from the histopathologic picture, the wooden spatula collected superficial epithelial cells with compression of the epithelium in the area of collection and leveling out of the cells in the direction of movement of the spatula. The cell aspirator collected cells from most layers of the epithelium and in a sharply circumscribed portion of the mucosal change. No subepithelial damage was observed with the 2 methods of collection.
A feasible method for the safe transport by gravity of clinical laboratory specimens has been developed. In this method, specimens are delivered inside containers that closely fit the conduit in which they descend. By...
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A feasible method for the safe transport by gravity of clinical laboratory specimens has been developed. In this method, specimens are delivered inside containers that closely fit the conduit in which they descend. By maintaining either end of the conduit closed, the containers descend at a constant speed that can be maintained at less than 120 cm. per sec. over a wide range of operating conditions of practical interest. The speed will increase with increasing container weight, but decrease with increasing length or diameter, or both. Heavier payloads can be accomodated at the same safe, slow speeds by increasing the size of the conduit. The system can be fabricated from standard, commercially available metal or plastic conduit.
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