Researchers at Seoul National University have developed a soft, skin-like wearable device that can continuously monitor blood pressure without the need for bulky cuffs or hospital visits. The patch, which adheres to the wrist like a bandage, uses a combination of electrical and mechanical signals—specifically, the timing difference between heartbeats and pulse waves—to measure systolic and diastolic pressure in real time.
To achieve this, the team designed a sensor that detects subtle skin movements caused by blood flow and heart activity. They used a novel material called liquid metal, which is flexible, stretchable, and highly conductive. By applying a laser sintering technique, they were able to pattern this metal into ultra-thin circuits that conform naturally to the skin. The result is a device that can stretch up to 700% of its original length and still function reliably after thousands of uses.
In tests, the patch successfully tracked rapid changes in blood pressure during exercise and recovery, outperforming traditional cuff-based monitors. This technology could be especially useful for people with hypertension, allowing them to monitor their condition throughout the day without discomfort. It also holds promise for integration into smartwatches, fitness gear, and other wearable health devices.
Article from SNU: SNU Mechanical Engineering Team Develops Wearable Blood Pressure Monitor That Attaches Like a Bandage for Real-Time Continuous Measurement
Abstract in Advanced Functional Materials: Highly Sensitive Cuffless Blood Pressure Monitoring with Selective Laser-Sintered Liquid Metal Conductors
