BEIJING – Med-tech firm Shanghai Asclepius Meditec Co. Ltd. says it has developed a hydrogen-oxygen nebulizer that can help relieve the shortage of ventilators, highlighting the potential of hydrogen-oxygen therapy in tackling COVID-19. Named the AMS-H-03, this class III medical respiratory device can produce three liters of mixed gas containing hydrogen and oxygen by using water electrolysis and can run continuously for 24 hours, according to the company.