Flow control system

A control system to restrict the flow rate of blood in a venous line of a perfusion system, wherein the perfusion system comprises a reservoir that is supplied by the venous line and that supplies an outgoing line, wherein the control system comprises:

• an outgoing flow sensor configured to determine an outgoing flow value indicative of the outgoing flow rate in the outgoing line,
• a controller configured to process the outgoing flow value, and
• an adjustable restriction for restricting the flow rate in the venous line to maintain a venous flow rate that does not exceed a venous restriction threshold,
• wherein the adjustable restriction is responsive to the controller and wherein the controller comprises a configuration allowing the controller to set the adjustable restriction at the level of the outgoing flow rate, to change the venous restriction threshold in response to a change of the outgoing flow rate, and
• wherein the controller is configured to determine if the outgoing flow value exceeds a pre-set pairing threshold and to set, if the outgoing flow value is above the pre-set pairing threshold, the adjustable restriction at the level of the outgoing flow rate.