If you do a simple google search you will be hard pressed to find too much about the new improvements in bloodless surgery, wikipedia only has info about the original bloodless system as it was invented by Dr Lorenz that does indeed relay on synthetics, but a boolean search might give you better results.

Heck I think I only know about it becuase alltough I am no longer a nurse I still have access to reading the latest copies of AORN.

Its basically a more modern surgical "technique" recently developed to improve on the now outdated so called Bloodless system, which was never really truely bloodless to begin with and as you pointed out called for the use of synthetics.

It is specifically designed to overcome the need for synthetics and donnor blood and in most cases even eliminates the need of the patient to pre-donante some of their own blood before the procedure, just in case more will be needed.

In the new improvement : blood isnt wasted or lost in any kind in any kind of signifigant ammount during surgery at all, because its recovered right there on the table as it comes out instead and recycled/cleaned in the surgical suite through a simple yet inovative filtration system and pumped right back into the patient during the procedure.

It eliminates the need of using most synthetic blood replacements and the use of blood thats been degenerating slowley in the storage system from other donnors (they whole improvement was invented to combat the issues associated with synthetics and the fact that blood in storage was found to indeed go bad and loose effectivness in storage and carry all sorts of individual inhibitors when taken from a donnor to a fast recovery compared to your own being pumped right back into you).

And where the new technique is in use: its resulted in less chance of infection and faster recovery times accros the board.

Its not even all that expensive for a hospital to covernt too eaither.