Their wearable biosensor technology – which features a "microfluidic impedance cytometer" that can measure blood cell counts or other biomedical data – could be added to watches and other wearable devices that monitor heart rates and physical activity, say the researchers.
"It's like a Fitbit but has a biosensor that can count particles," says Mehdi Javanmard, senior author of a study on the project and assistant professor in the Department of Electrical and Computer Engineering in the School of Engineering. "So that includes blood cells, bacteria, and organic or inorganic particles in the air."
Abbas Furniturewalla, lead author of the study and former undergraduate researcher in the Department of Electrical and Computer Engineering adds,"Current wearables can measure only a handful of physical parameters such as heart rate and exercise activity. The ability for a wearable device to monitor the counts of different cells in our bloodstream would take personal health monitoring to the next level."
The plastic wristband comprises a flexible circuit board and a biosensor with a channel – or pipe – that is thinner than the diameter of a human hair with gold electrodes embedded inside. It has a circuit to process electrical signals, a microcontroller for digitizing data, and a Bluetooth module to transmit data wirelessly.
Blood samples are obtained through pinpricks, with the blood fed through the channel and blood cells counted. The data are sent wirelessly to an Android smartphone with an app that processes and displays data.