specified that the cannula should have at least one lateral aperture which suggests that the number of outlets is not determinant or important inasmuch as in said patent the only thing that is foreseen is that the semen is introduced into the uterine neck but with any orientation of outlet or outlets the artificial insemination device that is put forward is characterised in that inside the catheter a cannula is placed axially through which it is possible to achieve a post cervical insemination by lengthening the length of the insemination conduct beyond the uterine neck depositing the semen in the uterine horns the new artificial insemination device consists of a standard catheter consisting of a tube or rod of flexible material and of a certain length that has at its front end a standard tip preferably cylindrical with a widening spiral for attachment to the uterine neck the back end of the catheter has a handle or a widening suitable for handling the elements of the new invention consist of a hollow cannula suitable for post cervical insemination for this the cannula is hollow preferably of cylindrical form whose outer diameter is particularly suitable to be introduced and housed fitting tightly but allowing movement inside the catheter the cannula is obviously longer than the catheter and is equipped at its rear end with a coupling device to allow bottles or tubes containing the semen to be introduced or the containers that contain.