Continuous positive airway pressure (CPAP) therapy is a common treatment for obstructive sleep apnea. A CPAP machine uses a hose and mask or nosepiece to deliver constant and steady air pressure.

In a classic “two steps forward, one step back” situation, just as Philips is aiming to wrap up the repair-and-replace program for the 5.5 million respiratory devices it began recalling two years ago, ...