Size of Stent (IMAGE) University of Pennsylvania School of Medicine Caption Researchers at the University of Pennsylvania School of Medicine are now studying an investigational treatment for emphysema, an airway bypass procedure. Physicians create new small pathways using a special needle to make small openings. Stents, like the one pictured here, are then put in place to keep the new passageways open in the lungs. Credit Courtesy: Broncus Technologies, Inc. Usage Restrictions None 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.