Intra Vas Device (image) Male Contraception Information Project Caption Two soft plugs are inserted into each vas deferens. Sperm that get past one are trapped by the other. Credit © Shepherd Medical Company Usage Restrictions Image may be used with appropriate credit. 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.