Artificial uterus the United States. A human placenta may theoretically be transplanted inside an artificial uterus, but the passage of nutrients across this artificial uterus remains an unsolved issue. The main function of an "amniotic tank" would be to fill the function of the amniotic sac in physically protecting the embryo or fetus, optimally allowing it to move freely. It should also be able to maintain an optimal temperature. Lactated Ringer's solution can be used as a substitute for amniotic fluid. Theoretically, in case of premature removal of the fetus from the natural uterus, the natural umbilical cord could be used, kept
Murder of pregnant women among women ages 20 to 24 and fifth among women ages 25–34 in 1999. The top cause of death in both age groups is accidents. The Unborn Victims of Violence Act, passed in 2004, defines a fetus as a "child in uterus" and a person as being a legal crime victim "if a fetal injury or death occurs during the commission of a federal violent crime." In the U.S., 38 states have laws with more harsh penalties if the victim is murdered while pregnant. Some of these laws defining the fetus as being a person, "for the purpose of criminal