Abstract: The disclosure embraces a contraceptive device of the type comprising a cral stem and a device for maintaining in place the said stem at the interior of the uterine cavity of a subject, the device being composed of two elastic arms symmetrical in relation to the stem integral therewith at its tip; the arms naturally occupy a position in which they diverge beyond the tip by making an angle of value at least equal to that of the angle that is generally formed between each other of the two y-shaped channels of the uterus of females of a given animal species and more particularly the canine species so that the arms can be engaged in the y-shaped parts and can be maintained there by spreading effect produced by their natural elasticity.