DARPA’s Injectable Foam Blocks Internal Bleeding

The Defense Advanced Research Projects Agency (DARPA) says it is studying a new type of injectable foam that molds to organs and slows hemorrhaging. This could provide field medics with a way to buy more time for soldiers en route to medical treatment facilities. The polyurethane foam begins as two liquids stored separately and injected together into the abdominal cavity. One liquid is a polyol, a type of alcohol. The other is made of isocyanates, a family of highly reactive chemicals widely used in the manufacture of flexible and rigid foams. Within about one minute after a medic inserts the liquids at the midline—near the belly button—the mixture expands to nearly 30 times its original volume and then turns solid. It slows or halts hemorrhaging by sealing wounded tissues. Once the patient can get to intensive care, doctors would remove the solid mass and then perform surgery to permanently stop any bleeding.