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WhySpace comments on Cryo with magnetics added - Less Wrong
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That was a mild pain to google, so I'm leaving what I dug up here so others don't have to duplicate the effort.
Persufflation is perfusion with gaseous oxygen. Perfusion is when fluid going to an organ passes through the lymphatic system or blood vessels to get there.
If I'm reading this correctly, there's no thermodynamic reason to pump the organ full of oxygen gas, but only a biological one. Cells need less oxygen when they're on ice for an organ transplant, but they still consume O2. If this isn't being delivered via blood flow, another source is needed.
I take it that the persufflation is to help with recovering kidneys from liquid nitrogen temperatures, and not in getting there without damage?
I'm sorry! Um, it probably doesn't help that much of the relevant info hasn't been published yet; this patent is the best description that will be publicly available until the inventors get more funding. From the patent:
So, pumping the organ full of cool gas (not necessarily oxygen) is done for reasons of cooling the entire tissue at the same time, as well as to prevent fracturing, rather than for biological reasons.
ETA: To answer your last question, persufflation would be done on both cooling and rewarming.
Thanks!