Method for measuring cardiac output

专利名称：Method for measuring cardiac output发明人：Jerome H. Abrams,Claire T. Hovland申请号：US06/930950申请日：19861111公开号：US04671295A公开日：19870609

摘要：Blood flow in the aorta and pulmonary artery of a mammal, most typically ahuman, is measured volumetrically by a non-invasive, ultrasound method and apparatus.The method comprises placing a piezoelectric ultrasound transducer in the trachea ingreat proximity to the aorta or pulmonary artery by passage through the oral or nasalcavity past the epiglottis and into the trachea or by passage through the surgical openinginto the trachea in the case of patients who have had a tracheotomy. Ultrasound wavesare transmitted toward the path of flow of blood in the artery. Reflected waves arereceived. The average Doppler frequency difference between transmitted and receivedwaves is measured. The cross-sectional size of the artery is measured. Blood flow rate isdetermined from the measurements. The apparatus comprises a tracheal tube or probewith one or two transducers mounted at one end the tube. The transducer(s) is (are)disposed to transmit ultrasound in selected directions. Electrical conductors extend fromthe transducers the length of the probe.

申请人：APPLIED BIOMETRICS, INC.

代理机构：Dorsey & Whitney

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