Key result
A custom-designed 5 MHz PMUT array successfully captured key arterial pulse waveform components, demonstrating potential for continuous cardiovascular system monitoring.
A custom-designed 5 MHz PMUT array can successfully track radial artery dynamics, showing potential for continuous cardiovascular monitoring.
May enable wearable continuous monitoring; hypothesis-generating pending clinical validation trials.
In this paper, a 5 MHz 1.5 × 1.5 mm 2 piezoelectric micromachined ultrasonic transducer (PMUT) array with 2 mm beam width and 5 mm penetration depth is designed to measure the dynamics of the radial artery. Single line ultrasonic pulse echo measurements with high time resolution, also called M-mode ultrasound imaging, are demonstrated to obtain radial artery dynamics to derive cardiovascular system bio-markers such as heart rate and artery diameter change. The extracted radial artery diameter change waveform is consistent with what is reported in the literature and captures the key arterial pulse waveform components including systolic upstroke, systolic decline, dicrotic notch, and diastolic runoff. This demonstrates the great potential of custom-designed PMUT arrays for continuous cardiovascular system monitoring.
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Jiang et al. (2021) studied this question. 5 MHz 1.5 × 1.5 mm2 piezoelectric micromachined ultrasonic transducer (PMUT) array was evaluated on Radial artery dynamics (heart rate and artery diameter change). A custom-designed 5 MHz PMUT array successfully captured key arterial pulse waveform components, demonstrating potential for continuous cardiovascular system monitoring.
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