A medical fluid control device for a medical fluid line system includes a fluid flow housing with at least one connection port for connecting to a further functional component of the fluid line system and which has an injection port with an openable closure element, and also having an adjustment member which is mounted movably in the fluid flow housing and which has flow channel sections which, depending on an adjustment position of the adjustment member, can be moved toward the at least one connection port and/or the injection port for a fluid throughflow. Assigned to at least one flow channel section of the adjustment member and/or to the injection port is at least one mechanical flow acceleration mechanism which assists with inside flushing of the injection port during a fluid throughflow.
