EndoPil (1 of 2) (image) Nanyang Technological University Share Print E-Mail Caption Measuring about 3cm by 1cm, the EndoPil prototype capsule contains a balloon that can be self-inflated with a handheld magnet once it is in the stomach, thus inducing a sense of fullness. Its magnetically activated inflation mechanism causes a reaction between a harmless acid and a salt stored in the capsule, which produces carbon dioxide to fill up the balloon. Credit NTU Singapore Usage Restrictions Mandatory credit Share Print E-Mail 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.