Concentric microaggregate blood filter

Details Concentric microaggregate blood filter Concentric microaggregate blood filter

1989-01-31

1990-09-04

Jones, W. Gary

Liquid purification or separation

Processes

Separating

210 94, 2103232, 210338, 210436, 210448, 210489, 210492, 210767, 604 4, 604406, B01D 2935, B01D 2958

Patent

active

049542516

ABSTRACT:
Microaggregate blood filter adapted to pre-filter aggregates larger than 150 microns without interfering with the on-going and continuous filtration of aggregates between 40 and 150 microns. Filter comprises a flexible housing having inlet and outlet ports and an interior nest of two generally cylindrical concentric outer and inner filter screens with a space between the screens. Blood to be filtered enters the housing from the top and is pre-filtered for aggregates larger than 150 microns by the inner screen. The inner screen defines a relatively large interior volume which allows filtered aggregates to collect by sedimentation at its lower portions in a manner that permits on-going, continuous, and unobstructed filtration of the blood through its upper portion for subsequent and final filtration through the outer 40 micron filter. A preferred filter has a transparent housing and built in drip chamber and can be primed without inverting the filter.

REFERENCES:
patent: 3506130 (1970-04-01), Shaye
patent: 3557786 (1971-01-01), Barr et al.
patent: 3593854 (1969-12-01), Swank
patent: 3664339 (1972-05-01), Santomieri
patent: 3765536 (1973-10-01), Rosenberg
patent: 3935111 (1976-01-01), Bentley
patent: 4035304 (1977-07-01), Watanabe
patent: 4087363 (1978-05-01), Rosemeyer et al.
patent: 4157967 (1979-06-01), Meyst et al.
patent: 4450078 (1984-05-01), Walker et al.
Abstract P 5-02, W. H. Walker et al., A Simple Transfusion Device for Filtration of Blood with a 40 um Filter Screen, Proceedings of the International Society of Blood Transfusion, p. 144, 1984.

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