Apparently there are several such systems available. It seems that patients can donate units beforehand or lost blood can be recovered in an emergency situation.
There is an interesting article on their use in the case of Jehovah's Witness patients here:-
http://www.anesthesia-analgesia.org/...29-a#RL2-83636
Obviously, if Jehovahs are to require such equipment, it raises questions on the extra drain on resources, budgets etc of the Hospital involved.
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