Biodegradable Magnesium-alloy Tracheal Stent (IMAGE) University of Pittsburgh Caption Researchers demonstrate for the first time the successful use of a completely biodegradable magnesium-alloy tracheal stent, pictured, that safely degrades over the course of eight weeks and does not require removal. Credit Materialise 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.