Robby Walker is lucky to be alive. After the 52-year-old father from Florida contracted COVID-19-related pneumonia, a ventilator wasn't enough. He needed Extracorporeal Membrane Oxygenation (ECMO), a treatment in which blood is routed through a machine that purifies and oxygenates it, giving the patient's lungs a chance to recover. But no ECMO machines were available in Florida or nearby states because other ECMO patients were using them.