We use cookies to understand how you use our site and to improve your experience. This includes personalizing content and advertising. To learn more, click here. By continuing to use our site, you accept our use of cookies. Cookie Policy.

Features Partner Sites Information LinkXpress
Sign In
Advertise with Us
Sekisui Diagnostics UK Ltd.

Download Mobile App

Wearable Radar Sensor Measures Blood Pressure Continuously

By HospiMedica International staff writers
Posted on 26 Feb 2020
Print article
Image: The CWR sensor that attaches to the sternum (Photo courtesy of Monash University)
Image: The CWR sensor that attaches to the sternum (Photo courtesy of Monash University)
A new study describes how two clip-on sensors attached to the sternum and earlobe can provide real-time blood pressure results.

Under development at Monash University (Melbourne, Australia), the novel measurement technique is based on radar sensor methodology. Instead of the traditional arm cuff, it uses a small continuous wave radar (CWR) sensor adhered to the sternum, and a photoplethysmogram sensor (PPG) clipped to the left earlobe. Using both sensors, the system measures pulse arrival time (PAT), pre-ejection period (PEP), and pulse transit time (PTT), and calculate continuous systolic blood pressure (SBP) from the data.

The researchers then collected experimental data from 43 subjects (40-65 years of age) in various static postures, as well as in 26 subjects doing six different exercise tasks, such as cycling on a stationary bike. Two mathematical models were then used to calculate SBP from the PTT/PAT data, and compare then to simultaneous sphygmomanometer readings. The results showed that for participants in the posture tasks, the best cumulative error percentage (CEP) was 92.28%, and for those in the exercises group, the best CEP was 82.61%. Additionally, removing PEP from PAT lead to a 9% improvement in results. The study was published on November 27, 2019, in Nature Scientific Reports.

“Clinicians still cannot continuously measure blood pressure during sleep, nor during times of activity such as walking or running. This means people with high, low, or irregular blood pressure can’t get the critical information they need about the state of their health around the clock,” said senior author Mehmet Yuce, PhD, of the department of electrical and computer systems engineering. “A wearable device that can provide comfort and portability while people are going about their daily lives will be a significant development for the health sector in Australia and internationally.”

CWR uses known radiofrequency (RF) energy that is transmitted and then received from any reflecting objects. Any movement of the transmitter, target, or both causes a change in the frequency of the electromagnetic wave, known as the Doppler shift. It is also possible to use CWR to measure range instead of range rate by frequency modulation. By measuring the frequency of the return signal, the time delay between transmission and reception can be measured.

Related Links:
Monash University

Gold Member
Disposable Protective Suit For Medical Use
Disposable Protective Suit For Medical Use
Gold Member
POC Blood Gas Analyzer
Stat Profile Prime Plus
Silver Member
Wireless Mobile ECG Recorder
Electric Bariatric Patient Lifter
SVBL 205

Print article


Surgical Techniques

view channel
Image: The endoscopic device can 3D image the stiffness of individual biological cells and complex organisms (Photo courtesy of University of Nottingham)

World’s First Microscopic Probe to Revolutionize Early Cancer Diagnosis

In the early stages of cancer, the cells are significantly softer than normal cells, which facilitates their movement through small spaces and contributes to the rapid spread of the disease, a process... Read more

Patient Care

view channel
Image: The newly-launched solution can transform operating room scheduling and boost utilization rates (Photo courtesy of Fujitsu)

Surgical Capacity Optimization Solution Helps Hospitals Boost OR Utilization

An innovative solution has the capability to transform surgical capacity utilization by targeting the root cause of surgical block time inefficiencies. Fujitsu Limited’s (Tokyo, Japan) Surgical Capacity... Read more

Health IT

view channel
Image: First ever institution-specific model provides significant performance advantage over current population-derived models (Photo courtesy of Mount Sinai)

Machine Learning Model Improves Mortality Risk Prediction for Cardiac Surgery Patients

Machine learning algorithms have been deployed to create predictive models in various medical fields, with some demonstrating improved outcomes compared to their standard-of-care counterparts.... Read more

Point of Care

view channel
Image: The Quantra Hemostasis System has received US FDA special 510(k) clearance for use with its Quantra QStat Cartridge (Photo courtesy of HemoSonics)

Critical Bleeding Management System to Help Hospitals Further Standardize Viscoelastic Testing

Surgical procedures are often accompanied by significant blood loss and the subsequent high likelihood of the need for allogeneic blood transfusions. These transfusions, while critical, are linked to various... Read more
Copyright © 2000-2024 Globetech Media. All rights reserved.