Pump flow rate compensation system

Details Pump flow rate compensation system Pump flow rate compensation system

1983-12-20

1984-08-28

Coven, Edward M.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

128DIG12, 604 67, A61M 103

Patent

active

044682190

ABSTRACT:
This invention relates generally to systems for handling biological fluids such as blood and more particularly relates to apparatus for maintaining a constant flow rate of fluid by a peristaltic pump when the pressure at the input of such a pump goes negative or positive. More specifically, the invention uses a microprocessor which provides an output signal representative of the incremental change in pump speed required when the pump input experiences a negative or positive pressure regime.
The microprocessor output is based on a sensed input pump pressure, P.sub.o, a pressure, P.sub.i, which is the pressure at which extensions of the linearly decreasing portions of the pump characteristic curves intersect the pressure axis on a plot of Pressure vs Flow Rate for a given pump and a desired flow rate, Q.sub.o. The resulting output is applied to a stepper motor via a programmable timer and driver amplifier. The motor mechanically linked to the pump drives the pump at a speed which maintains the flow rate constant.

REFERENCES:
patent: 3882861 (1975-05-01), Kettering et al.
patent: 3946731 (1976-03-01), Lichtenstein
patent: 4055175 (1977-10-01), Clemens et al.
patent: 4077405 (1978-03-01), Haerten et al.
patent: 4080966 (1978-03-01), McNally
patent: 4245634 (1981-01-01), Albisser et al.
patent: 4280494 (1981-07-01), Cosgrove et al.
patent: 4392849 (1983-07-01), Petre et al.

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