Air bubble detecting and discriminating circuit arrangement and

Details Air bubble detecting and discriminating circuit arrangement and Air bubble detecting and discriminating circuit arrangement and

1983-02-24

1986-01-21

Freeh, William L.

Pumps

Processes

417 63, 417412, 417477, 604 67, 604123, 604153, 128DIG13, 340632, F04B 2100, F04B 4312, A61M 500, G08B 2100

Patent

active

045655006

ABSTRACT:
An air bubble detecting and discriminating circuit arrangement especially suitable for use in a peristaltic infusion pump assembly is disclosed herein. This arrangement not only detects air bubbles in the fluid flowing through the tubing forming part of the assembly, but distinguishes between those bubbles which are sufficiently large to create a problem and smaller, micro bubbles which need not be detected. The arrangement also automatically compensates for changes in the flow rate of the fluid through the pump assemblies tubing without requiring any modifications at the time the flow rate is changed.

REFERENCES:
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patent: 3898637 (1975-08-01), Wolstenholme
patent: 3935876 (1976-02-01), Massie et al.
patent: 3974681 (1976-08-01), Namery
patent: 4114144 (1978-09-01), Hyman
patent: 4213454 (1980-07-01), Shim
patent: 4256437 (1981-03-01), Brown
patent: 4280495 (1981-07-01), Lampert
patent: 4312341 (1982-01-01), Zissimopoulos et al.
patent: 4367736 (1983-01-01), Gupton
patent: 4373525 (1983-02-01), Kobayashi
Bigbie, et al., "Bubble Detector for Blood Circulating Devices," IBM Tech. Disclosure Bulletin, vol. 19, No. 3, pp. 769-771, Aug. 1976.

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