Theragrippers (IMAGE) Johns Hopkins Medicine Caption When an open theragripper, left, is exposed to internal body temperatures, it closes on the instestinal wall. In the gripper's center is a space for a small dose of a drug. Credit Johns Hopkins 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.