There is no such technology at present. Sperm must combine with egg cells to develop, and egg cells are only available to women. Even if there is an embryo, it can't grow on the arm. Embryo development must have a certain environment, and the uterus is the best. It is said that there is a scientific male artificial conception theory abroad, in which the artificially fertilized embryo is placed in the male body (not the arm) for development. No one has practiced it so far.