Method and apparatus for fluid flow control

Details Method and apparatus for fluid flow control Method and apparatus for fluid flow control

1980-11-07

1982-07-13

Kamm, William E.

Surgery

Respiratory method or device

Ozone or ion generation

A61M 500

Patent

active

043389325

ABSTRACT:
An improved method and apparatus for parenteral administration of medical fluids, wherein a normally shut-off intravenous feeding tube is selectively opened at a frequency and open period duration automatically regulated by a digital control system to establish a fluid flow rate at any selected rate over a wide dynamic range. Measured and desired flow rates are converted to digital electrical signals and compared, the electrical difference being used to vary a control voltage which establishes the width of energizing pulses controlling a member for opening the feeding tube. The frequency of the energizing pulses is preferably a non-integral multiple of the desired drop flow rate and varies from a very high ratio, e.g. 15.5, at very low flow rates to a much smaller ratio, e.g. 2.5, at very high flow rates.

REFERENCES:
patent: 4037598 (1977-07-01), Georgi
patent: 4048474 (1977-09-01), Oleson
patent: 4077405 (1978-03-01), Haerten et al.
patent: 4191184 (1980-03-01), Carlisle

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