Device including an ultrasonic transducer

Abstract

A device is proposed that is configured to be positioned on a user's limb (M). The device (100) comprises: a physiological sensor (150) configured to generate a cardiac signal characteristic of the user's cardiac activity; an ultrasonic transducer (180) configured to generate a Doppler signal characteristic of blood flow in the limb (M); and a control unit (140) configured to: receive a cardiac signal from the physiological sensor (150); analyze the received cardiac signal; and, in response to the detection of a suspected cardiac arrhythmia in the cardiac signal analysis, activate the ultrasonic transducer (180) to generate a Doppler signal. Figure for the abstract: Fig. 1