Negative pressure valving system and transmembrane pressure alarm system
First Claim
1. A dialysis machine for use with a negative pressure dialyzer which includes a negative pressure control valve positioned upstream of a dialyzer, a negative pressure sensing means operatively associated with said valve means positioned downstream thereof, and a negative pressure pump for drawing dialysate through said valve means and said dialyzer, wherein the improvement comprises said negative pressure valve means, comprising electromagnetically controllable flapper valve means for accurately controlling negative pressure to pressures as negative as about -400 mm/Hg, said valve means having substantially linear operating characteristics to pressures as negative as about -400 mm/Hg and said valve means also being effective to minimize the time in which said machine responds to changes in negative pressures.
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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.
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Citations
7 Claims
- 1. A dialysis machine for use with a negative pressure dialyzer which includes a negative pressure control valve positioned upstream of a dialyzer, a negative pressure sensing means operatively associated with said valve means positioned downstream thereof, and a negative pressure pump for drawing dialysate through said valve means and said dialyzer, wherein the improvement comprises said negative pressure valve means, comprising electromagnetically controllable flapper valve means for accurately controlling negative pressure to pressures as negative as about -400 mm/Hg, said valve means having substantially linear operating characteristics to pressures as negative as about -400 mm/Hg and said valve means also being effective to minimize the time in which said machine responds to changes in negative pressures.
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7. A dialysis machine for use with a negative pressure dialyzer, said machine having a negative pressure control system for controlling the negative pressure at the dialyzer,
said system including: - a negative pressure control valve cooperatively associated with the dialyzer;
negative pressure sensing means operatively associated with the dialyzer and said valve means; and
negative pressure pump means for drawing dialysis solution through said valve means and said dialyzer; andwherein said negative pressure valve means comprises electromagnetically controllable flapper valve means for accurately controlling negative pressure to pressures as negative as about -400 mm/Hg, said valve means having substantially linear operating characteristics to pressures as negative as about -400 mm/Hg and said valve means also being effective to minimize the time in which said machine responds to changes in negative pressures.
- a negative pressure control valve cooperatively associated with the dialyzer;
Specification