Measuring and testing – Volume or rate of flow – Combined
Patent
1975-11-05
1977-12-06
Wolk, Morris O.
Measuring and testing
Volume or rate of flow
Combined
232585R, 232585B, 232585M, 73215, 55 36, 55159, 55178, 128 205F, 210188, A61B 502, A61M 103, G01F 120, G01F 1508
Patent
active
040610314
ABSTRACT:
Combination of a flow meter and a bubble trap for blood which has been extracted for extra-corporeal treatment, in particular for dialysis. Said combination comprises a container divided by a vertical partition wall into a vertically elongated inlet chamber having an inlet opening receiving the blood flow to be measured and treated, and an outlet chamber of substantially greater cross-section than the inlet chamber and in liquid communication with an outlet opening. According to the invention, a narrow passage with a substantially smaller cross-section than the inlet opening is provided through the partition wall, preferably near the lower end of the same, causing the liquid level in the elongated inlet chamber to rise substantially above the level of said narrow passage. The difference between the liquid levels in the respective chambers will be an indication of the blood flow rate through the container, a pressure equalization opening being provided through the wall above said liquid levels. Both chambers are serving as efficient bubble traps, the influx of blood to the inlet chamber taking place below the liquid level and preferably in a vertical direction, and the output chamber providing the advantageous combination of an extended free surface and a reduced blood flow rate.
REFERENCES:
patent: 1505050 (1924-08-01), Lauritsen
patent: 2292007 (1942-08-01), Morgan
patent: 3044236 (1962-07-01), Bearden et al.
patent: 3527572 (1970-09-01), Urkiewicz
patent: 3769207 (1973-10-01), Baer
Marcus Michael S.
Wolk Morris O.
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