Lightweight sensor measures heart rate and body movement

In use, the patch employs tissue-contact impedance, a real-time electrocardiogram (ECG), and an accelerometer to monitor physical activity.

The electronics module measures less than two by two centimetres, thanks to advanced system in package (SiP) technology from Japan’s Shinko Electric Industries. It is further claimed that high accuracy algorithms, low power consumption, and small size and weight make the patch suited to consumer applications.

A number of activity monitors exist that can count the number of steps a person takes, or calories they’ve burned. Heart rate is a key input in determining activity levels, so monitors that can be worn comfortably on the chest offer the greatest accuracy. This, in turn, increases the demand for small, lightweight monitors that can flex and move with a person’s body.

Imec and Holst Centre claim their patch makes such applications possible because it combines ultra-low power electronics and flexible electrode technology to provide the end user with a 1-lead ECG, a tissue-contact impedance sensor and a 3D accelerometer.