Cell Therapy Pouch (IMAGE) Johns Hopkins University Caption The outer stent is made of stainless steel. The inner one, made of nitinol, is covered by a band of nylon mesh. The cell therapy "pouch" is created in the gap between the two stents. Credit Will Kirk/JHU 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.