Arrangement for measuring cross-sectional fluctuations of condui

Details Arrangement for measuring cross-sectional fluctuations of condui Arrangement for measuring cross-sectional fluctuations of condui

1976-02-25

1978-06-20

Kamm, William E.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

73602, A61B 502

Patent

active

040955974

ABSTRACT:
An arrangement for measuring cross-sectional fluctuations on conduits which are streamed through by fluids, particularly blood vessels, pursuant to the Ultrasound-Doppler method, through the utilization of an ultrasound transmitter-receiver system, a Doppler apparatus for determining the power or intensity of Doppler signals, as well as a dividing element for the obtained Doppler signal intensities. A single ultrasound transmitter-receiver is provided for the irradiation or projection of ultrasound into the liquid and for the receipt of the ultrasound reflected from the liquid, wherein an installation is associated with the Doppler apparatus for the formation of the intensity of the Doppler signal with on the one hand, the amplitude fluctuations, as well as, on the other hand, a timewise arithmetic median value of the intensity without material fluctuations, and in which the dividing element is connected to this installation for the purpose of forming the quotient from these intensities.
The arrangement utilizes such quotient in the provision of indications of volumetric flow and conduit elasticity.

REFERENCES:
patent: 3554030 (1971-01-01), Peronneau
patent: 3675192 (1972-07-01), Fahrbach

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