There are two commonly cited endeavors in progress. Focusing on finding ways to save premature babies, Japanese professor Dr. Yoshinori Kuwabara of Juntendo University, has successfully gestated goat embryos in a machine that holds amniotic fluid in tanks.
On the other end of the process focusing on helping women unable to conceive and gestate babies, is Dr. Helen Hung-Ching Liu, Director of the Reproductive Endocrine Laboratory at the Center for Reproductive Medicine and Infertility at Cornell University. Quietly, in 2003, she and her team succeeded in growing a mouse embryo, almost to full term, by adding engineered endometrium tissue to a bio-engineered, extra-uterine “scaffold.”
More recently, she grew a human embryo, for ten days in an artificial womb. Her work is limited by legislation that imposes a 14-day limit on research projects of this nature. As complicated as it is, her goal is a functioning external womb.
The ectogenesis technology itself is highly complicated, though somewhat simple looking. Basically, it appears as an amniotic fluid-filled aquarium with a bunch of feeding tubes and monitoring cables attached to a live, developing organism. Those tubes bring the nutrients, oxygen, etc needed to grow an organism and help it survive; the cables monitor everything going on inside the tank. There’s certainly a Matrix feel to it all.
While much of the technology for starting to experiment with artificially growing a human fetus already exists, bona fide human trials are likely at least a decade off, largely due to the murky legal and ethical implications of the controversial concept.