Liquid collection container and extracorporeal circuit

An extracorporeal circuit for extracorporeally circulating blood, comprising:

• a blood reservoir possessing a storage chamber for temporarily storing liquid, the reservoir comprising a tube having an upper end, the reservoir having a lower end opening at a bottom region of the storage chamber;
• an arterial line connectable to a patient during extracorporeal circulation to receive blood from the patient;
• a venous line connectable to a patient during extracorporeal circulation to return blood to the patient;
• a pump connected to the lower end opening of the blood reservoir;
• the upper end of the tube of the blood reservoir being adapted to be connected to a source of priming solution;
• an oxygenator connected to the arterial line and the pump to effect gas exchange on the blood from the patient;
• a flexible collection container possessing an interior for collecting the priming solution;
• a partition in the interior of the collection container dividing the interior of the collection container into a first space positioned above a second space;
• a branch line in fluid communication with the venous line and branching from the venous line, the first space being in fluid communication with the branch line;
• the interior of the collection container comprising a communication part for establishing communication between the first space and the second space;
• and
• wherein the priming solution is introduced into the first space by way of the branch line, and is collected in the second space via the communication part.