Blood substitute
Published (updated: ) in Tech News.
https://en.wikipedia.org/wiki/Blood_substitute
We need the perfect blood, with a good immune system for us, up to date with the current humanity. In the cryonics process we remove blood, we will need to replace the cryoprotectant with a new blood. This tech will evolve too. Better for everyone. The blood substitute might include smart nanomachines.