TORONTO – An airway clearance device that uses acoustic sound waves to treat lung disorders and respiratory infections like cystic fibrosis (CF) is now being used to clear the lungs of patients suffering very badly from COVID-19. Developed by Montreal-based Dymedso Inc., more than 675 Frequencer acoustic devices currently being utilized across the world are assisting COVID-19 patients by removing mucous and secretions from their lungs and smaller airways.