Device for providing extracorporeal blood circulation

An apparatus for providing an extracorporeal blood circuit, in particular heart-lung machine, with a venous connection (V) and an arterial port (A) comprising at least a base module (B) with a control device (24) and a detachably connected with the basic module the patient module (P) , the blood-carrying components of the extracorporeal blood circuit, wherein between the venous connection (V) and the arterial port (a) a bubble sensor (80) is provided, characterized in that the bubble sensor (80) is a quick-closing valve (82) in the arterial connection (A) controls, when bubbles are detected.