Vital-signs monitor could be produced for lower costs

A patent is being processed for the monitoring system and it’s now ready for clinical trials, the researchers said in a statement. When commercialised, it could be used as a disposable electronic sensor, with many potential applications due to its performance, small size and low cost.

Heart monitoring is said to be one obvious candidate, since the system could gather data on some components of an EKG, such as pulse rate and atrial fibrillation.

Its ability to measure EEG brain signals could find use in nursing care for patients with dementia and recordings of physical activity could improve weight-loss programmes. Similarly, measurements of perspiration and temperature could provide data on infection or disease onset.

‘Current technology allows you to measure these body signals using bulky, power-consuming, costly instruments,’ said Patrick Chiang, an associate professor in the OSU School of Electrical Engineering and Computer Science. ‘What we’ve enabled is the integration of these large components onto a single microchip, achieving significant improvements in power consumption. We can now make important biomedical measurements more portable, routine, convenient and affordable than ever before.’

The much higher cost and larger size of conventional body data monitoring precludes many possible uses, Chiang said. Compared to other technologies, the new system-on-a-chip cuts the size, weight, power consumption and cost by about 10 times.

Some of the existing technologies that would compete with this system, such as pedometers currently in use to measure physical activity, cost $100 or more. The new electronics developed at OSU, by comparison, are about the size and thickness of a postage stamp, and could be taped over the heart or at other body locations to measure vital signs.

Part of what enables this small size, Chiang said, is that the system doesn’t have a battery. Instead, it harvests radio-frequency energy from a nearby device, which in this case is a cell phone.

‘The entire field of wearable body monitors is pretty exciting,’ Chiang said. ‘By being able to dramatically reduce the size, weight and cost of these devices, it opens new possibilities in medical treatment, health care, disease prevention, weight management and other fields.’

The new technology could be used in conjunction with cell phones or other radio-frequency devices within about 15ft, but the underlying micropowered system-on-a-chip technology can be run by other energy-harvested power sources, such as body heat or physical movement.

OSU will work to develop this technology in collaboration with private industry, an increasing area of emphasis for the university.

This research, supported by the National Science Foundation and the Catalyst Foundation, was recently reported at the Custom Integrated Circuits Conference in San Jose, California.