The international scientific XPatch project has brought together biosensoric experts to design a patch with specialized microelectronics for the fitness and medical technology market that can capture and visualize exactly this data on mobile devices.
How could a patch supercharged with advanced electronics work as a fitness tracker? The tiny health monitor includes antenna and integrated circuits for wireless communication with a Bluetooth device, a flexible micro-battery for autonomous operation, the necessary analogue circuit, and the power management components. The microelectronics specialists at the Fraunhofer Institute for Reliability and Microintegration IZM have developed the packaging and integration technology needed to fit all of the miniscule biosensors and electronics into a flexible patch that is suitable for use in active athletics. All told, the patch and its components are designed to be less than a millimetre thick.
XPatch is a biocompatible and flexible module, worn directly on the skin. This called for a soft and stretchable skin-like choice of material, like polyurethane and silicon. As the electronics are embedded in that material, the components are fully protected and never in direct contact with bare skin. The patch's thin biochemical sensor chips are where the magic happens: They are placed into the surface of the patch, where they are kept close to the skin. A tiny opening in the substrate allows the sweat analysis to work. A miniscule piece of fabric is integrated in the empty space behind the chip and captures the wearer's perspiration. The sensor built into the chip analyses this sample and pushes the resulting data in real time to a device, where the user can visualize the information and use the insights to improve their physical fitness.
This can be used to analyse the sweat of athletes and display the resulting data immediately and in real time on mobile devices. In order to get the captured biochemical data to a smartphone coupled with the patch, Fraunhofer IZM integrated a special wireless interface into the flexible patch that uses the particularly efficient Bluetooth Low Energy protocol. The antenna needed to achieve this had to be particularly compact, but also robust enough to cope with the unique requirements of the application's pliable material and special electrical properties.
After the ultra-sensitive patch passed its technical validation, work started on fully functional prototypes that will soon grace the bodies of athletes for initial trials in late August.
COMPAMED-tradefair.com; Source: Fraunhofer Institute for Reliability and Microintegration