Flexible Sensing Electronics in Biomedical Applications
Dr. Rujie Sun
Flexible electronics are attracting increasing attention as rapid developments in material science, mechanics and microfabrication techniques create new opportunities for the integration of various high-quality electronic, and optoelectronic systems into a single miniaturized device. Most tissues and skins in human body possess soft, curvilinear, and time-dynamic surfaces. To conformably bio-integrate with the human body, next generation of wearable devices for human physiological information monitoring should be highly flexible, stretchable, and sensitive. Sensing systems are core components to provide reliable feedback on body conditions, directly determining therapy choices.
In this presentation, I will discuss two examples of flexible sensing electronics in biomedical applications, stretchable piezoelectric sensing systems and a needle-shaped microsystem for tissue stiffness measuring. Conventional piezoelectric sensors have the advantage of potentially being self‐powered, but have limitations due to their intrinsic lack of stretchability. A mechanical design, kirigami-inspired approach, is introduced to achieve stretchability while retaining the mechanical integrity of the underlying materials. In the second modulus-sensing system, an injectable needle-shaped device is developed based on piezoelectric microsystem. The pathology of tissue detection is realised using mechanical properties of tissues as the biomarkers.
Dr. Rujie Sun is a Postdoctoral Researcher at the Institute of Biomedical Engineering, Imperial College London. He was born in Jiangsu, in 1990, and received B.S. and M.S. degrees in Engineering Mechanics from Nanjing University of Aeronautics and Astronautics, China, in 2011 and 2014, respectively. He joined Molly Stevens group as a Postdoctoral Researcher in March 2019. Before that, he received his Ph.D. degree at Bristol Composites Institute, University of Bristol, UK in 2019. From 2016 to 2017, he was a research scholar in John Rogers group at Northwestern University, USA. He has published more than 20 papers in top journals and conferences in areas of flexible sensing devices and energy harvesting, including Nature, Nature Biomedical Engineering, Applied Energy, etc. His research interests include flexible electronics, soft robotics, 3D printing, and drug delivery.