Liquid purification or separation – Flow – fluid pressure or material level – responsive
Patent
1979-08-29
1981-02-24
Lander, Ferris H.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
210130, 210143, 2103213, 128214R, 137 82, 13762564, 204306, B01D 3340, F15B 500
Patent
active
042526515
ABSTRACT:
There is disclosed herein a negative pressure dialysis machine which includes a negative pressure valving system and transmembrane pressure alarm system.
An electromagnetically controlled flapper valve is disclosed herein for use as a negative pressure control valve. The flapper valve permits accurate control of negative pressure and changes in negative pressure to be affected rapidly.
Transmembrane pressure alarm systems are provided which detect the difference in pressure between the blood and dialysate in the dialyzer and activate alarms and prevent dialysis (a) if the dialysate pressure exceeds the blood pressure and/or (b) if a blood pressure signal is not received which would permit actual transmembrane pressure to increase beyond a predetermined limit.
REFERENCES:
patent: 2915077 (1959-12-01), Wehrli et al.
patent: 2931343 (1960-04-01), Moog, Jr.
patent: 3515275 (1970-06-01), Bowman
patent: 3795318 (1974-03-01), Crane et al.
patent: 3878095 (1925-04-01), Frasier et al.
patent: 3946731 (1976-03-01), Lichtenstein
patent: 4098274 (1978-07-01), Ebling et al.
Baxter Travenol Laboratories Inc.
Flattery Paul C.
Geren Gerald S.
Lander Ferris H.
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