Changing Face of America: Into the Brain Without Surgery NPR's Patricia Neighmond tells us about a medical procedure that seals brain aneurysms (weakened and pouching sections of blood vessels) without having to cut patients skulls open. It involves the insertion of a tube through the arteries. The tube contains a tiny "Slinky" -- a platinum coil, which doctors use to fill the pouch. Blood then clots around it, neutralizing the aneurysm and preventing rupture. Ruptured aneurysms in the brain cause one of the four types of stroke.