Indication Cardiovascular surgical interventions, enabling the patient’s haematocrit to be raised again following haemodialysis. Technical Characteristics Class IIa medical haemodialysis devices, Extracorporeal Circulation Circuits for Haemofiltration are used to transport the patient’s blood. The blood is taken in the circuit before being reinjected after a volume of water has been removed: Assembly of various sterile Tubes. Combination with a blood Pump and a Haemofilter.