A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
349/36, 349/39
A61B 10/00 (2006.01) A61B 8/06 (2006.01) G01F 1/66 (2006.01)
Patent
CA 1133627
ABSTRACT OF THE DISCLOSURE There is disclosed a liquid velocity measuring apparatus comprising an actuable generator for providing a relatively high frequency signal to a transmitting transducer for directing an ultrasonic wave into a conduit through which liquid is directed. A receiver transducer is disposed to re- ceive the acoustical wave as reflected from the liquid, and to provide an output signal to be amplified and demodulated to provide a train of high frequency pulses, the frequency of which is indicative of the velocity of the liquid directed through the conduit. The train of pulses is applied to a counter and a decoder for respectively counting and decoding the pulses to provide a signal to a display whereby a digital indication of the liquid velocity is given. Further, a timing circuit is provided for enabling the generator, the counter and the decoder for a first, relatively short period of time, made dependent upon the cross-sectional area (or diameter) of the conduit through which the liquid is directed, and for energizing the display for a second relatively long period of time to permit reading of the display.
319230
Medtronic Inc.
Smart & Biggar
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