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Open AccessArticle

A New Wearable Device for Blood Pressure Estimation Using Photoplethysmogram

by 1,2,3, 3 and 1,2,*
Laboratoire Traitement du Signal et de l’Image, Université de Rennes 1, Rennes F35000, France
Institut National de la Santé et de la Recherche Médicale, U1099, Rennes F35000, France
Farasha Labs, Paris 75000, France
Author to whom correspondence should be addressed.
Sensors 2019, 19(11), 2557;
Received: 18 April 2019 / Revised: 17 May 2019 / Accepted: 29 May 2019 / Published: 4 June 2019
We present a novel smartwatch, CareUp ® , for estimating the Blood Pressure (BP) in real time. It consists of two pulse oximeters: one placed on the back and one on the front of the device. Placing the index finger on the front oximeter starts the acquisition of two photoplethysmograms (PPG); the signals are then filtered and cross-correlated to obtain a Time Delay between them, called Pulse Transit Time (PTT). The Heart Rate (HR) (estimated from the finger PPG) and the PTT are then input in a linear model to give an estimation of the Systolic and Diastolic BP. The performance of the smartwatch in measuring BP have been validated in the Institut Coeur Paris Centre Turin (ICPC), using a sphygmomanometer, on 44 subjects. During the validation, the measures of the CareUp ® were compared to those of two oscillometry-based devices already available on the market: Thuasne ® and Magnien ® . The results showed an accuracy comparable to the oscillometry-based devices and they almost agreed with the American Association for the Advancement of Medical Instrumentation standard for non-automated sphygmomanometers. The integration of the BP estimation algorithm in the smartwatch makes the CareUp ® an easy-to-use, wearable device for monitoring the BP in real time. View Full-Text
Keywords: blood pressure; photoplethysmogram; pulse transit time; PPG; PTT blood pressure; photoplethysmogram; pulse transit time; PPG; PTT
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MDPI and ACS Style

Lazazzera, R.; Belhaj, Y.; Carrault, G. A New Wearable Device for Blood Pressure Estimation Using Photoplethysmogram. Sensors 2019, 19, 2557.

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