A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
349/39
A61B 8/06 (2006.01) G01F 1/66 (2006.01) G01P 5/24 (2006.01) G01S 15/52 (2006.01) G01S 15/58 (2006.01)
Patent
CA 2007157
43027CAN8A ABSTRACT OF THE DISCLOSURE A Doppler blood flow system and method in which an ultrasonic wave is reflected off of red blood cells in blood flowing in tubing. The relfected ultrasonic wave is digitally processed in the frequency domain. The flow rate of the blood is directly related to the average frequency of the Doppler signal. The typical Doppler signal is not a single frequency representing a single flow rate but is really an entire range of frequencies in which certain frequencies predominate which are indicated by increased amplitude of the signal when plotted in the frequency domain. The typical Doppler signal may actually have two "humps", one at a higher frequency which represents the actual information bearing content of the signal related to flow rate and one at a lower frequency which is caused by vibrations in the blood tubing system itself and could be caused by motor noise from the blood pump. Since the flow rate is related to average frequency of the information bearing portion of the typical Doppler signal, the low frequency "hump" must be taken out of Doppler signal in order to obtain an accurate flow rate.
Smith Dirk R.
Weaver Billy L.
Minnesota Mining And Manufacturing Company
Smart & Biggar
Smith Dirk R.
Weaver Billy L.
LandOfFree
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