Ultrasonic Doppler blood flow meter for extracorporeal circulation

Ricardo G. Dantas; Eduardo Tavares Costa; Joaquim Miguel Maia; Vera Lucia da Silveira Nantes Button

doi:10.1117/12.383426

20 April 2000 Ultrasonic Doppler blood flow meter for extracorporeal circulation

Ricardo G. Dantas, Eduardo Tavares Costa, Joaquim Miguel Maia, Vera Lucia da Silveira Nantes Button

Proceedings Volume 3978, Medical Imaging 2000: Physiology and Function from Multidimensional Images; (2000) https://doi.org/10.1117/12.383426
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

In cardiac surgeries it is frequently necessary to carry out interventions in internal heart structures, and where the blood circulation and oxygenation are made by artificial ways, out of the patient's body, in a procedure known as extracorporeal circulation (EC). During this procedure, one of the most important parameters, and that demands constant monitoring, is the blood flow. In this work, an ultrasonic pulsed Doppler blood flowmeter, to be used in an extracorporeal circulation system, was developed. It was used a 2 MHz ultrasonic transducer, measuring flows from 0 to 5 liters/min, coupled externally to the EC arterial line destined to adults perfusion (diameter of 9.53 mm). The experimental results using the developed flowmeter indicated a maximum deviation of 3.5% of full scale, while the blood flow estimator based in the rotation speed of the peristaltic pump presented deviations greater than 20% of full scale. This ultrasonic flowmeter supplies the results in a continuous and trustworthy way, and it does not present the limitations found in those flowmeters based in other transduction methods. Moreover, due to the fact of not being in contact with the blood, it is not disposable and it does not need sterilization, reducing operational costs and facilitating its use.

Citation Download Citation

Ricardo G. Dantas, Eduardo Tavares Costa, Joaquim Miguel Maia, and Vera Lucia da Silveira Nantes Button "Ultrasonic Doppler blood flow meter for extracorporeal circulation", Proc. SPIE 3978, Medical Imaging 2000: Physiology and Function from Multidimensional Images, (20 April 2000); https://doi.org/10.1117/12.383426

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