Method and apparatus to determine an initial flow rate in a...

Measuring and testing – Volume or rate of flow – By measuring transit time of tracer or tag

Reexamination Certificate

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Reexamination Certificate

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11456751

ABSTRACT:
A method and apparatus for determining an initial flow rate in a conduit is disclosed. A known change is made to the flow to be measured, resulting changes (or values corresponding to these changes), or relative changes in the flow to be measured are monitored and the initial flow in the conduit is calculated from the value of the known change and monitored changes. Devices to practice the method include catheters having one or two sensors and one or two sites for introducing the volume change.

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