Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent
1981-12-15
1984-11-13
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
604 6, 604 65, 177211, G01F 100
Patent
active
044818270
ABSTRACT:
An apparatus for separating and collecting plasma from whole blood includes a collection rate monitoring system which provides a digital display of the rate of plasma collection per minute. A transducer circuit within the system develops an electrical signal frequency-dependent on the weight of the collected plasma. The frequency of this signal over a present measurement interval is periodically compared with the frequency of the signal over a preceding measurement interval to develop a signal indicative of the volume of plasma collected during the interval. This signal is combined in a shift register with signals developed over a plurality of immediately preceding measurement intervals, which, taken with the present interval, comprise a one minute period, to develop at the end of each interval an output signal indicative of the total units of plasma collected over the previous minute. A display counter responsive to each output of the shift register produces a digital display of collected volume units per minute. In the illustrated embodiment, each measurement interval is one second, and the present increment and fifty-nine immediately preceding increments are combined to obtain a readout in units per minute.
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Randall "A New Uroflowmeter for Routine Clinical Use", in Bio-Med Eng. vol. 10 #1 1/75 pp. 21-24.
Bilstad Arnold C.
Foley John T.
Baxter Travenol Laboratories Inc.
Cummings Eugene M.
Flattery Paul C.
Goldstein Herbert
Ryan Daniel D.
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