Canadian researchers develop radar system for monitoring vital signs

The mobile-phone sized device records heart and breathing rates using sensitive radar waves that are analysed by algorithms embedded in an onboard digital signal processing unit.

The group developed the system to monitor sleep apnoea patients by detecting subtle chest movements instead of connecting them to equipment in labs via numerous cumbersome wires.

"We take the whole complex process and make it completely wireless," said George Shaker, an engineering professor at Waterloo. "And instead of a clinic, it could be done in the comfort of your own bed and run daily for continuous monitoring."

In a study at the University’s Research Institute for Aging, the radar unit was mounted to the ceiling over the bed of more than 50 volunteers as they slept normally in a model long-term care apartment. The technology achieved results over 90 per cent as accurate as standard hard-wired equipment.

"This is the first time radar has been used for heart sensing with this degree of accuracy and in such an uncontrolled environment," said Mostafa Alizadeh, a research associate who led the study. "Our subjects slept unobstructed, in any position, for up to eight hours."