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BACKGROUND A new Doppler flowmeter using a special transducer forming two ultrasound beams to insonate vessels was developed. This low-cost flowmeter allows the flow to be measured independently of the angle of insonation. METHODS Sixty-five flow determinations were made in the carotid arteries of five pigs. The flowmeter measured the flow in an artery bled into a calibrated vessel. Results were compared with the true volume of the blood captured. RESULTS On average, 13 measurements per animal were made at different flow rates (80 to 600 mL/min). The flowmeter measured flow-volume rates in mL/min were found to be within +/- 15% of the cylinder captured volume. CONCLUSIONS The accuracy of the angle-independent flowmeter is comparable with that of flowmeters currently used clinically. The small size and portability, low operator dependency, and low cost suggest potential for continuous acute and chronic-flow monitoring and a potential for an implantable flow-monitoring device.
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