With h/t to Glenn Reynolds, Extracorporeal Membrane Oxygenation. Our lungs are internal membranes. If we don't even need to use lungs (temporarily), firstly those on a transplant-list can, er, wait that bit longer.
I'd also call this good for hibernators in space except that, I think, a more-pressing issue is the decaying muscles and brain.
More important: what about scrubbing chemicals OUT of the blood? This starts with carbon-dioxide and, honestly, carries on to urea.
Overall good news, just incomplete news.
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