Occluder (image) Friedrich-Schiller-Universitaet Jena Caption This is an occluder made of a nickel-titanium alloy. These medical implants are used for the correction of a defective cardiac septum. Credit Photo: Jan-Peter Kasper/FSU Usage Restrictions None 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.