Well, when I talk about an "artificial womb" I'm discussing a science-fictional device, and can therefore assign it whatever characteristics I want. I therefore postulate a form of terminating a pregnancy which is in no sense more traumatic than a current abortion, but which nonetheless maintains the integrity of the blastocyst or fetus, in such a way that it can be moved to the artificial womb where it can continue developing.

THAT'S actually the tricky part, rather than the developement of the artificial womb per se. . .