Negative pressure valving system and transmembrane pressure...

Details Negative pressure valving system and transmembrane pressure... Negative pressure valving system and transmembrane pressure...

A - Human Necessities

61

M

182/15.2

A61M 1/16 (2006.01)

Patent

CA 1110551

ABSTRACT OF THE DISCLOSURE There is disclosed herein a negative pressure dialysis machine which includes a negative pressure valv- ing 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 pre- vent 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.

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