Surgery – Blood drawn and replaced or treated and returned to body – Constituent removed from blood and remainder returned to body
Patent
1982-07-30
1985-01-15
Coven, Edward M.
Surgery
Blood drawn and replaced or treated and returned to body
Constituent removed from blood and remainder returned to body
128630, A61A 103, B01D 1900
Patent
active
044936931
ABSTRACT:
A monitoring system for monitoring trans-membrane pressure in plasmapheresis apparatus utilizing a microporous membrane type filter includes first and second pressure-to-frequency transducer circuits for developing signals frequency-indicative of the inlet and outlet pressures of the filter. The signals are digitally compared in a pulse subtraction circuit to produce an output signal frequency-indicative of trans-membrane pressure. The output signal is applied to a periodically reset display counter to develop a digital readout of trans-membrane pressure. Porous filter elements in the flow system and in the inlet port of each transducer isolate bacteria within the flow system, prevent contamination of the transducers, and provide a time constant for each transducer which prevents transient flow variations in the system from causing erroneous trans-membrane pressure readings.
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Bilstad Arnold C.
Foley John T.
Woodworth Walker P.
Baxter Travenol Laboratories Inc.
Coven Edward M.
Cummings Eugene M.
Flattery Paul C.
Ryan Daniel D.
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