https://www.wired.com/story/modified-sleep-apnea-machines-may-ease-the-ventilator-crunch/

As hospital administrators and public health officials scramble to meet a shortage of ventilators for Covid-19 patients, teams of doctors, engineers, and DIYers are filling some gaps by modifying breathing machines that are relatively plentiful, such as those used to treat sleep apnea. This technological fix is happening at the same time as a bubbling medical debate among physicians over whether too many coronavirus patients are being placed on traditional ventilators that some argue may do more harm than good.

A team of UC Berkeley engineering students designed and built a conversion kit to retrofit several thousand sleep apnea machines that have been donated to a volunteer group in the Bay Area called Ventilators SOS. The modified devices are helpful for patients who are improving or have milder symptoms, saving ventilators for severely ill patients who are battling advanced respiratory failure.