Method and apparatus for fluid flow control

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

A - Human Necessities

61

M

128/91

A61M 5/00 (2006.01) A61M 5/168 (2006.01)

Patent

CA 1166917

IMPROVEMENTS IN METHOD AND APPARATUS FOR FLUID FLOW CONTROL ABSTRACT OF THE DISCLOSURE 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.

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