Ultrasonic continuous wave doppler blood flow-meter

A - Human Necessities – 61 – B

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A61B 8/06 (2006.01) G01P 5/24 (2006.01)

Patent

CA 2197935

An ultrasonic continuous wave doppler blood flow-meter deflects an ultrasonic continuous wave to an arbitrary angle and transmits it into an organism, thereby measuring a blood flow speed of the organism. Two continuous sine wave signals of different phases and a plurality of sets of pairs of coefficients are generated. One of each of the pairs of coefficients is multiplied to one of the two sine wave signals. The other one of each of the pairs of coefficients is multiplied to the other one of the two sine wave coefficients. After that, two sine wave signals after the multiplication are added, so that a plurality of synthesis sine wave signals are generated. When a plurality of micro vibrators are driven by the plurality of synthesis sine wave signals, the ultrasonic continuous wave is deflected to an arbitrary angle and is transmitted into the organism.

L'invention est un débitmètre sanguin doppler qui fait dévier une onde ultrasonore entretenue à un angle quelconque et la transmet à un organisme vivant pour mesurer le débit du sang dans cet organisme. Comme résultat, deux ondes sinusoïdales continues de phases différentes et une pluralité d'ensembles de paires de coefficients sont engendrés. L'un des coefficients de chacune des paires est multiplié par l'une des deux ondes sinusoïdales. L'autre coefficient de chacune des paires de coefficients est multiplié par l'autre onde sinusoïdale. Après ces multiplications, les deux ondes sinusoïdales sont additionnées et une pluralité d'ondes sinusoïdales de synthèse sont ainsi engendrées. Quand une pluralité de microvibrateurs est attaquée par la pluralité d'ondes sinusoïdales de synthèse, l'onde ultrasonore entretenue est déviée à un angle quelconque et est transmise dans l'organisme.

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