Microtech2010 2010

Wirelessly powered miniature wearable vital signs monitor

M. Marzencki, B. Kaminska
Simon Fraser University, CA

Keywords: wireless power transfer, wearable devices, sensor nodes

Abstract:

In this work, we propose a novel system that employs a long range inductive link to recharge a small battery on-board a wearable device. One end of the link is integrated into the wearable device and the other end is integrated in various common objects present in the proximity of the user, ranging from furniture (i.e. bed) to personal electronics (i.e. mobile phone). The application of wireless energy transfer in this case is motivated by comfort of use and reliability rather than necessity. In case of wireless power transfer, intermittent battery recharging is transparent for the user, thus very convenient. The proposed study case is a miniature vital signs and activity monitoring wearable node developed at CiBER Laboratory. The node uses a 2.4GHz radio to wirelessly transmit acquired data to a base station. The average power consumption of the node is 2.4mW with one lead ECG acquisition and transmission of calculated heart rate every 5s. We demonstrate that small and comfortable coils can be used to fully power such device when up to 35cm away from the source coil.
 
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