Buffy coat separator float system and method

G - Physics – 01 – N

Patent

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Details

G01N 1/18 (2006.01) B01L 99/00 (2010.01) G01N 9/30 (2006.01) G01N 33/50 (2006.01)

Patent

CA 2500884

A tube and float system (100) for use in separation and axial expansion of the buffy coat includes a transparent or semi-transparent, flexible sample tube (130) and a rigid separator float (110) having a specific gravity intermediate that of red blood cells and plasma. The float (110) includes a main body portion (112) of reduced diameter to provide a clearance gap (150) between the inner wall of the sample tube (130) and the float (110). One or more protrusions (114) on the main body portion (112) serve to support the flexible tube (130). During centrifugation, the centrifugal force enlarges the diameter of the tube (130) to permit density-based axial movement of the float (110) in the tube (130). The float (110) further includes a pressure relief system (152) to alleviate pressure build up in the trapped red blood cell blood fraction below the float (110), thereby preventing red blood cells from being forced into the annular gap (150) containing the buffy coat layers.

L'invention concerne un tube et un système à flotteur destinés à la séparation et à la dilatation axiale de la couche leuco-plaquettaire, et comprenant un tube d'échantillon souple transparent ou semi-transparent et un flotteur de séparation rigide présentant une densité située entre celle des globules rouges et celle du plasma. Le flotteur comprend une partie de corps principale de diamètre réduit permettant d'obtenir un espace de jeu entre la paroi intérieure du tube d'échantillon et le flotteur. Une ou plusieurs saillies sur la partie de corps principale servent à supporter le tube souple. Pendant une centrifugation, la force centrifuge élargit le diamètre du tube de façon à permettre un mouvement axial basé sur la densité du flotteur dans le tube. Le flotteur comprend en outre un système de libération de pression permettant de limiter l'accumulation de pression dans la fraction de sang contenant des érythrocytes piégée en dessous du flotteur, ce qui empêche les érythrocytes d'être entraînés dans l'espace de jeu contenant les couches leuco-plaquettaires.

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