Most effective method to preserve an injured human?

Let's assume that Captain Bob Tiberius Kirk has been injured in a space battle. The universe does not have FTL travel, and the nearest hospital where Bob can be treated is 5 years of space voyage away. If he is not treated within one week, he dies.

I need a way to preserve Bob. Hard SF, so no stasis chambers and no magic stuff. It is not possible to treat Bob on the ship.

So...what should I use? Wouldn't throwing Bob into a vat of liquid nitrogen damage the body? Should he be frozen quickly or slowly? Should he be frozen at all (Cryonics is of course a good idea, but it is interesting to hear about other methods of conserving living beings)?

What is the best method to preserve a human being for a long time, with minimal damage to the body or unhealthy effects?

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Most effective method to preserve an injured human?

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