1. A medical device for injecting contrast media containing at least two separate containers, the corresponding contents of which cannot be mixed inside one or the other container, an injector and a dispenser configured to alternately communicate the containers with the injector, characterized in that it contains means for providing alternate messages with a frequency of 0.2 to 5 Hz for at least two consecutive cycles. 2. The medical device according to claim 1, characterized in that the frequency is about 1 Hz. The medical device according to claim 1, characterized in that the frequency is variable in time. The medical device according to claim 1, characterized in that it is configured to provide a continuous flow of from 0.1 to 5 ml from the same container. The medical device according to any one of the preceding paragraphs, characterized in that one container contains a contrast agent, and the other container contains saline. A medical device according to any one of claims 1 to 4, characterized in that each container contains a contrast agent in a specific concentration. The use of a medical device according to any one of the preceding paragraphs, characterized in that they establish an alternate message containers with an injector with a frequency of from 0.2 to 5 Hz. 8. The use according to claim 7, characterized in that the frequency is about 1 Hz. The use according to claim 7 or 8, characterized in that they provide a continuous flow from 0.1 to 5 ml from the same container. The use according to claim 7, characterized in that at each alternation from a single container, a volume of less than 5 ml is introduced. The use of claim 7 for inputting a contrast medium1. Медицинское устройство для инъекции контрастных средств, содержащее по меньшей мере две отдельные емкости, соответствующее содержимое которых не может смешиваться внутри одной или другой емкости, инъектор и распределитель, выполненный с возможностью установления поочередного сообщения емкостей с инъе
