A blood vessel (108) for blood or extracorporeal plasma comprising treating: - a first part track (134) is connected to the output of a filter, - a second part track (137) which is connected to an access vascular a patient, - a site infusion (145) acting between the first track (134) and the second track (137), and injected into the bloodstream a solution restores the ion balance blood or plasma, comprising: - a first main channel (200) in fluid communication with the first part track (134) and having a first flow area, - a second main channel (220) in fluid communication with the second track (137) and having a second flow, - means for forming (210) a zone located turbulence downstream of and in fluid communication with the first main channel, located upstream of and in communication fluid with the second channel p ain, these forming means comprising a first means of fluid passage (224) defining a reduction (225) in the passage section and whose section smaller step is smaller than the first flow area and smaller than the second flow of fluid, - a secondary channel (230) comprising an inlet (231) to let a solution restoring the ion balance and an outlet (232) in fluid communication with at least one of the three elements selected from the first main channel (200), means for forming (210) a zone of turbulence and the second main channel (230) characterized in that the means of forming the zone of turbulence (210) include a second medium fluid passage (22f) downstream of the first means of fluid passage (224) defining an increase (227) in the passage section fluid in the flow direction of the fluid and the fluid passage section of the second fluid passage means (226) is larger smaller than said first flow area and smaller than said second flow.Una vía sanguínea (108) para tratamiento sanguíneo o de plasma extracorpóreo que comprende: - una primera parte de vía (134) que estará conectada a la salida de un filtro, - una segunda parte de vía (137) que estará conectada a
