Patent ID: 7351218

Claim:
A device for treating blood by extracorporeal circulation comprising: a filter having a first chamber and a second chamber separated by a semi-permeable membrane; an arterial line connected to the first chamber of the filter; a venous line issuing from the first chamber of the filter, the venous line having a tube portion; a channel used for pre-infusion of a substance for local anticoagulation and linked to the arterial line; a purge channel issuing from the second chamber of the filter; an air separator on the venous line, said air separator being the only air separator present in the venous line and does not contain an air detector; a line for post-infusion of a solution at least partially re-establishing the ionic equilibrium of the blood downstream of the air separator; an air detector; and a reservoir connected to the post-infusion line and containing the solution at least partially re-establishing the ionic equilibrium of the blood, wherein, the post infusion line is mounted immediately upstream of the air detector, the tube portion of the venous line extending between the air detector and a patient venous line connector configured on said venous line, said tube portion being configured not to receive another line or another injection device.