Liquid purification or separation – Filter – Movable medium
Patent
1978-08-14
1984-12-11
Sever, Frank
Liquid purification or separation
Filter
Movable medium
210515, 210516, 210DIG24, B01D 3322
Patent
active
044876963
ABSTRACT:
A serum and cell separating and dispensing device comprising an elongated tubular vessel partitioned throughout its length forming two distinct compartments containing vent orifices on either side. One opened end of the vessel is fitted with a resilient element containing a larger and smaller orifice which houses a small and large pore filter respectively. These orifices communicate with the two compartments respectively. At the opposite end of the vessel are two small tubular vessels extending from and communicating with the compartments formed by the partition. Blood drawn in an evacuated collection tube such as Becton Dickinson's vacutainer is centrifuged after clotting. The device is forced into the opened end of the collection tube and pressed downwardly. The resilient element forms an air trap by touching the inner wall of the collection tube and serum is forced through the orifices containing the filters. Due to the pore size of the filters and the size of the orifices, serum and cells become located within the separate compartments. One may tilt the assembly in one direction allowing drops of serum to be dispensed whereas turning the assembly in another direction allows dispensing of cells. In this manner blood samples from patients may be dispensed for crossmatching purposes without using the usual droppers. At the same time integrity of patients identification is maintained.
REFERENCES:
patent: 3355098 (1967-11-01), Farr
patent: 3481477 (1969-12-01), Farr
patent: 3493503 (1970-02-01), Mass
patent: 3586064 (1971-06-01), Brown et al.
patent: 3706305 (1972-12-01), Berger et al.
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