A way to deliver oxygen directly to the bloodstream intravenously

 https://medicalxpress.com/news/2022-03-oxygen-bloodstream-intravenously.html

"The researchers tested their machine on human donor blood and in rats and found it passed as a proof of concept. In human blood, their machine could increase blood oxygen saturation from 15% to over 95% within seconds to minutes. And they increased saturation from 20% to 50% inside of rats. They acknowledge that it is not yet ready for testing in humans. They plan to continue with tests on larger animals before testing on humans"