WPI Heart Patch Next to Model Heart (IMAGE) Worcester Polytechnic Institute Caption Worcester Polytechnic Institute (WPI) researches are bioengineering a patch of woven biopolymer microthreads, which are about the width of a human hair. The patch is designed to help cardiac muscle beat more strongly after a heart attack. This photo shows a sample patch next to a model of the human heart. Credit Worcester Polytechnic Institute 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.