Philips has voluntarily recalled millions of its CPAP and BiPAP machines because users could be breathing in foam particles and potentially cancer-causing chemicals.

Recalled sleep apnea (CPAP and BiPAP) machines from Phillips have been tied to over 500 deaths. Here’s what to know about the recalled lots.

The company first announced the problem in mid-2021, but efforts to repair or replace the machines have dragged on for years, frustrating patients in the U.S. and other countries.

New York received 2,400 BiPap machines to help treat coronavirus patients, but how do they work?

• CPAP machines, which are used by people with sleep apnea, have some superficial similarities with ventilators, raising the question of whether they could be adapted to ease the coronavirus ...