1. A catheter device comprising: a hollow sleeve portion (1) of a catheter, the distal end of which is configured to connect to a catheter (2), and at the proximal end of which is a connecting means (3) provided for additional means, a valve element (6) which prevents the appearance of blood from the sleeve part (1) of the catheter in the near direction, and the valve element (6) is formed in the form of a two-way valve made with the possibility of a through flow of fluid in both directions, whereby of tea, the medium or blood can be withdrawn at the proximal end of the catheter sleeve, characterized in that the valve element (6) is opened by either increasing or decreasing the pressure on the proximal side of the valve element (6) .2. A catheter device according to claim 1, in which the valve element (6) is made with at least one radially extending slot (6a). A catheter device according to claim 2, in which the valve element (6) is made with more than two radially extending slots (6a). A catheter device according to claim 1, in which, on the near side of the valve element (6), an element (9) is provided for actuating the valve, which is located completely in the catheter sleeve (1) and which is provided with a direction for axial displacement. . The catheter device according to claim 4, in which the element (9) for actuating the valve can be moved in the far direction in the catheter sleeve (1) by means of a connecting element (11, 16) to open the valve element (6) .6. The catheter device according to claim 5, in which the valve element (6)1. Катетерное устройство, содержащее:полую втулочную часть (1) катетера, дальний конец которой выполнен с возможностью подсоединения к катетеру (2), а у ближнего конца которой расположено соединительное средство (3), предусмотренное для дополнительного средства,клапанный элемент (6), который предотвращает появление крови из втулочной части (1) катетера в ближнем направлении, причем клапанный элемент (6) образован в виде двухходов
