Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1983-12-22
1986-09-23
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604118, 604246, 128DIG13, 7386147, 7386152, A61M 514, G01F 138
Patent
active
046133259
ABSTRACT:
A flow rate sensing device, particularly for use in regulating the rate of flow in a system for parenteral administration of liquids to patients. The liquid emerges from a storage reservoir and is fed into a housing through an upstream flow passage portion and then is made to pass through a narrow throat passage wherein the velocity of the liquid increases while its pressure decreases. The liquid then emerges into a downstream flow through passage and flows through an outlet from the housing. In an intravenous fluid administration system, the housing outlet is connected to a terminal tubing section and an intravenous needle. A pressure transducer, consisting of two chambers separated by a resilient deformable diaphragm, has its upstream chamber in fluid and pressure communication with the upstream flow path portion and its downstream chamber in fluid and pressure communication with the flow emerging from the throat passage. Variations in the flow rate through the throat passage effect changes in the pressure differential between the transducer chambers and thus cause variable degrees of displacement of the transducer diaphragm. The mechanical signals created by the movement of the diaphragm can be transduced to an arrangement for controlling the rate of fluid flow through the system. Alternatively, the mechanical signal created by the diaphragm can be transduced to flow rate monitoring or flow rate coordinating systems.
REFERENCES:
patent: 2365573 (1944-12-01), McGay
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patent: 4043332 (1977-08-01), Metcalf
patent: 4216673 (1980-08-01), November
patent: 4240294 (1980-12-01), Grande
patent: 4277227 (1981-07-01), Jenkins
patent: 4299220 (1981-11-01), Dorman
patent: 4340050 (1982-07-01), Noiles
Lester Michelle N.
Rosenbaum C. Fred
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