The agency OK’d an artificial vessel to restore blood flow in patients, even though its own scientists flagged questionable study results and potentially fatal ruptures of the product. The agency OK’d an artificial vessel to restore blood flow in patients, even though its own scientists flagged questionable study results and potentially fatal ruptures of the product. Medical Devices, Implants, Biotechnology and Bioengineering, Blood, Regulation and Deregulation of Industry, Research, Clinical Trials, United States Defense and Military Forces, Humacyte Global Inc, Food and Drug Administration, Defense Department, United States Army NYT > Science