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지속적인 중심혈압 측정을 위한 단일 유연 초음파 센서의 디자인, 제작, 및 특성분석
임현철(Hyeoncheol Lim),정순인(Soonin Jung),정동규(Dongku Jung),남상우(Sangwoo Nam),유재석(Jaesok Yu),김회준(Hoe Joon Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This study reports a new simple design of a single flexible ultrasonic sensor with the flexible copper electrode to obtain conformal contact to the target with high penetration depth and broad – 6 dB fractional bandwidth for non-invasive continuous monitoring of the central blood pressure. The central blood pressure from carotid and aorta deeply embedded under the skin (~ 30mm) has stronger correlation to cardiovascular diseases than the blood pressure from peripheral vessels. The existing wearable ultrasonic sensors for continuous monitoring of the blood pressure either have insufficient penetration depth for measuring the central vessels or complicated array structures fabricated by complex processes resulting in low device yield. Here, we solve these problems with a simple design of the single flexible ultrasonic sensor using a flexible 1-3 piezoelectric composite. It shows a high effective electromechanical coupling factor (0.69), high penetration depth (40 mm), a resonant frequency of 1.96 MHz, and - 6 dB fractional bandwidth of 32% with the sensor size of 12 x 5 ㎟. In the near future, we will measure the central blood pressure. We believe this proposed sensor is suited for continuous monitoring of the central blood pressure.
지속적인 중심혈압 측정을 위한 단일 유연 초음파 센서의 디자인, 제작, 및 특성분석
임현철(Hyeoncheol Lim),정순인(Soonin Jung),정동규(Dongku Jung),남상우(Sangwoo Nam),유재석(Jaesok Yu),김회준(Hoe Joon Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This study reports a new simple design of a single flexible ultrasonic sensor with the flexible copper electrode to obtain conformal contact to the target with high penetration depth and broad – 6 dB fractional bandwidth for non-invasive continuous monitoring of the central blood pressure. The central blood pressure from carotid and aorta deeply embedded under the skin (~ 30mm) has stronger correlation to cardiovascular diseases than the blood pressure from peripheral vessels. The existing wearable ultrasonic sensors for continuous monitoring of the blood pressure either have insufficient penetration depth for measuring the central vessels or complicated array structures fabricated by complex processes resulting in low device yield. Here, we solve these problems with a simple design of the single flexible ultrasonic sensor using a flexible 1-3 piezoelectric composite. It shows a high effective electromechanical coupling factor (0.69), high penetration depth (40 mm), a resonant frequency of 1.96 MHz, and - 6 dB fractional bandwidth of 32% with the sensor size of 12 x 5 ㎟. In the near future, we will measure the central blood pressure. We believe this proposed sensor is suited for continuous monitoring of the central blood pressure.