Method of filtering using a rotating and oscillating spinner
AssigneeBaxter Travenol Laboratories, Inc.
InventorsDonald W. Schoendorfer, William F. McLaughlin
Life of this patent
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Abstract
A disposable diagnostic plasma filter dispenser includes a low cost disposable container and a rotor drive for rotationally energizing a rotor within the container. The disposable container is particularly suitable for drawing and dispensing blood samples for clinical analysis and includes a tube shaped outer wall having a frangible dispenser outlet cover, a close fitting inner tube supporting a filter membrane and a unitary rotor disposed for axel free rotation and axial translation within the inner tube in response to energization from the rotor driver. The rotor produces vortex enhanced filtration while maintaining a flow of filter fluid through the filtration gap and creating a transmembrane pressure.
Claims8
The method comprising filtering liquid from a suspension using a spinner having a generally cylindrical outer surface and a concentric filter membrane separated from the outer surface by a gap by,
- rotating the spinner about a central axis, with the surface of the spinner being adjacent the concentric membrane, the relative surface velocity of the spinner and the gap being selected to establish dynamic motion in the suspension, and
- oscillating the spinner along the central axis to develop internal pressure in the suspension for urging filtrate through the membrane.
Dependencies are inferred from the claim text.