The invention refers to an intravenous catheter apparatus comprising: a central part of a catheter (12) set at a proximal end of a catheter tube (10),Where the central part of the catheter (12) has an internal surface (14) which defines a chamber (16)；A needle (20) which defines an axial direction and which has a needle tip (24),Where the needle (20) extends through the chamber (16) and the catheter tube (10) when in a prepared position； a needle bulkhead (32) which is gently arranged on the needle (20) and at least partially received in the chamber (16) when the needle (20) is in the prepared position, in which the needle Needle bulkhead (32) includes a base portion (34) and first and second arms (36, 38) extending from the base portion (34),Where the first arm (36) is deflected radially out by the needle (20) against a restoring force when the needle (20) is in the prepared position through which the needle bulkhead (32) is brought into restraint contact with the central part of the catheter (12)；And in which the catheter apparatus includes a valve separating a distal space disposed distally from the valve of a proximal space disposed in the proximal direction of the valve. The invention additionally provides the valve that opens based on a pressure differential between the pressure prevailing in distal space and the pressure prevailing in proximal space.a invenção se refere a um aparelho de cateter intravenoso que compreende: uma parte central de cateter (12) disposta em uma extremidade proximal de um tubo de cateter (10), em que a parte central de cateter (12) tem uma superfície interna (14) que define uma câmara (16)； uma agulha (20) que define uma direção axial e que tem uma ponta de agulha (24), em que a agulha (20) se estende através da câmara (16) e do tubo de cateter (10) quando em uma posição preparada； um anteparo de agulha (32) disposto de modo deslizável na agulha (20) e pelo menos parcialmente recebido na câmara (16) quando a agulha (20) está na posiç
