Rotatable chamber for separating blood or plasma components

Rotatable chamber for separating components with different densities and/or sizes from blood or platelet-rich plasma, comprising a channel (10, 23, 27) following a curve that is generally concave with respect to the axis of rotation (2, 28) of said chamber (1), alongside which are located an opening (7, 19, 29) for feeding blood or plasma and at least two openings (8, 9, 21, 25, 26, 30, 31, 32) for evacuating said separated components, means (P) for applying a tangential force to the blood or plasma to cause it to move from the feed opening (7, 19, 29) to the evacuation openings (8, 9, 21, 25, 26, 30, 31, 32) , and means (M) for driving said chamber (1) in rotation, in order to apply a radial force to the blood or plasma to be separated to cause said solid particles to sediment out against the outer lateral wall of said channel (10, 23, 27), characterized in that said outer lateral wall comprises a plurality of adjacent recesses (16, 24, 33, 34) that are successive in the direction (F) of flow of the blood or plasma to be separated, each having an angular extent that is determined as a function of the respective trajectories of said components, the radial distance between the lateral wall of each of said recesses and said axis of rotation (2, 28) progressively reducing in the direction of its downstream end.