IV Pump with back pressure control

Details IV Pump with back pressure control IV Pump with back pressure control

1979-09-21

1982-03-30

Freeh, William L.

Pumps

With condition responsive pumped fluid control

417507, 128218F, F04B 4908, F04B 3908

Patent

active

043222013

ABSTRACT:
A volumetric infusion pump of the type having a rolling diaphragm pumping chamber includes a back pressure sensor between the rolling diaphragm pumping chamber and the pump outlet for sensing back pressure. A valve is positioned between the back pressure sensor and the pump outlet for controlling fluid flow to the pump outlet in order to control back pressure supplied to the rolling diaphragm pumping chamber. Back pressure is maintained within the rolling diaphragm pump chamber so that the rolling diaphragm maintains close contact with the piston even in the event of a negative head pressure at the pump outlet. The valve and the back pressure sensor are preferably linked so that the valve restricts fluid flow to the pump outlet only when the sensed back pressure is less than a predetermined level.

REFERENCES:
patent: 2711134 (1955-06-01), Hughes
patent: 3192864 (1965-07-01), Notte
patent: 3362346 (1968-01-01), Bottoms et al.
patent: 3428042 (1969-02-01), Chesnut
patent: 3730495 (1973-05-01), Elam
patent: 4042153 (1977-08-01), Callahan
patent: 4121584 (1978-10-01), Turner
patent: 4142524 (1979-06-01), Jassawalla
patent: 4155362 (1979-05-01), Jess
patent: 4199307 (1980-04-01), Jassawalla
patent: 4210138 (1980-08-01), Jess

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