Eating blood is not the same as transfusing blood. The prohibition on blood in Acts does not in any way refer to the medical use of blood to save life.
The JW argument/example about abstain from alcohol = do not inject it, has been dealt with on here, and has also been made redundant by their acceptance of blood fractions.
That great trinitarian Tertullion may well have been referring to christians of jewish background to whom blood sausage would be anathema anyway, or perhaps they contained "things strangled", again, the early christian refusal is not of a life saving medical procedure but of a food.
The Acts decree is to deal with a problem that arose between gentiles becoming christians and the jews who already followed christ, it is a decree to solve a first century local problem, and has nothing to do with medical practice in the 21st century.