Registration of Phasic Changes of Blood Flow by Means of a Catheter-Type Flowmeter

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Abstract
A differential transformer with variable coupling placed at the tip of a catheter tube and surrounded by an umbrella type device has been used for the measurement of blood velocity. The instrument was carefully tested by means of a pump producing truly sinusoidal fluid movement. It was shown that the flowmeter has a linear characteristic and a linear frequency response with pump frequencies up to 25 cps. A blood flow recording taken in the ascending aorta of a dog with unopened chest demonstrates the instrument's practical application.