Abstract: This catheter comprises at least one tube and preferably two tubes. These tubes are, at one of their ends, parallel and open out into an inflatable balloon and are, at their opposite ends, independent and extend through an end member and terminate beyond the end member in a flared end portion. The latter is clamped in a sealed manner between the end member and a cylindrical socket. The latter is adaptable in a receiving head of an apparatus which is integral with a syringe or other source of fluid so that the tube is thus supplied with safety with fluid such as a contrasting product, a product which is opaque to X-rays or a silicone for obturating the vessel for the purpose of inflation or delfation of the balloon, for the control of its position and possibly for the definitive obturation of the vessel. This catheter and the apparatus are also particularly adaptable for neuroradiological examinations and to treatments of blood vessels.