Granular-Jamming Cap (IMAGE) Vanderbilt University Caption The granular-jamming cap, left, compared to the current elastic headband that allows the computer to track the position of a patient's head during endonasal surgery. Credit Joe Howell, Vanderbilt University 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.