Visualization of the helmet design (IMAGE) American Institute of Physics Caption In Physics of Fluids, researchers discuss their design of an open-faced helmet for patient use that is connected to a medical-grade air filtration pump from the top that creates a reverse flow of air to prevent cough droplets from exiting the helmet. Visualization of the helmet design. The top port is connected to an air filtration pump, which is not shown in the image. Credit Image by Dongjie Jia Usage Restrictions Journalists may use this image only with appropriate credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.