Liquid purification or separation – Processes – Separating
Patent
1990-07-09
1992-09-01
Dawson, Robert A.
Liquid purification or separation
Processes
Separating
210232, 210241, 210252, 21032168, 210359, 210398, 210407, 210784, 422 58, 422 72, 422101, 436177, 436180, B01D 3700, B01D 3300
Patent
active
051436272
ABSTRACT:
An apparatus and method provide automated collection and transfer of particles from a liquid suspension to a glass slide for visual examination. A solution which contains particles, for example cells, is drawn through a filter element so that particles too large to pass through the filter element collect against a first surface of the filter element. A transfer fluid, such as alcohol, is applied from a second surface of the filter element to the first surface, to transfer cells from the filter element to a glass slide positioned adjacent the filter element. An alternative transfer mechanism applies a selected pneumatic signal to the filter element for transferring collected cells to the viewing slide. The apparatus includes a device for dispersing the liquid suspension of particles prior to the collection process and particles collect against the filter element with a spatial distribution advantageous for visual examination. The transfer operation maintains this spatial distribution. The cell-dispersing device and the filter element are on a common structure, for unitary movement, and which is readily disposable and replaceable for each sample of particles.
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Barlas J. Morgan
Farber Fredric L.
Hurley Anne A.
Lapidus Stanley N.
Polk, Jr. Lewis T.
Cytyc Corporation
Dawson Robert A.
Kim Sun U.
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