consent and infection I would have thought
You just cant march up to a bod - and say - Oh I will have that.
BUT - those of us who are old enough to be taught by war veterans....
The Russians in WW2 used to use cadaveric blood ( ugh and how did he know and if he saw ig, how did he escape death in a Gulag ? )
Get a body - anyone will do
stick a cannula in the neck
hang it up side down
and then and then - rolls of rubber sheeting ( huge esmarch bandanges using technical language ) and wrap it tighhtly around the body and squeeze the blood out - every last drop
well sorry you did ask
and that was in the days of bottle, red rubber tubes no disposables AAAND no drip chambers .... golly
I will have to see if it comes up in wiki
Oh and the industrialisation of blood transfusiion which occurred during the war - really was organised by a Yank who died from a ruptured spleen later and was not transfused ( yes really )