System for filtering medical and biological fluids

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 69/02 (2006.01) A61K 35/14 (2006.01) B01D 39/16 (2006.01) B01D 61/14 (2006.01) B01D 61/22 (2006.01) B01D 63/16 (2006.01) B01D 65/08 (2006.01) A61M 1/26 (2006.01) A61M 1/34 (2006.01)

Patent

CA 2237019

A method and apparatus for filtering suspensions of medical and biological fluids, one aspect of which is separating a suspension comprising at least two types of particles (104) and (108) which are differently sized or shaped and in which a first type of red cell particle (104) may be deformable at a relatively lower force and/or faster rate than a second type of white cell particle (108). A filter membrane (100) is provided having pores (102) with substantially precisely dimensioned pore sizes, with the pores (102) being dimensioned to allow passage of the first type of particle (104) without distortion or only minimal distortion and passage of the second type of particle (108) only with substantial distortion. Because the filter membrane (100) has precisely dimensioned pores (102), with spacing between the pores (102) being maintained despite the smaller interval between the pores (102), the porosity of the membrane (100) may be relatively much greater, allowing faster filtration rates while reducing shear exposure time and consequently reducing particle damage. Various methods for preventing clogging of the membrane (100) are also disclosed.

Procédé et dispositif pour filtrer des fluides médicaux et biologiques en suspension. Un aspect consiste à dissocier une suspension comprenant au moins deux types de particules (104) et (108), de taille ou de forme différente, dans laquelle un premier type de particule de globule rouge (104) peut subir une déformation à une force relativement moins élevée et/ou à une vitesse relativement moins élevée qu'un second type de particule de globule blanc (108). Une membrane filtrante (100) a des pores dont la taille est dimensionnée de manière sensiblement précise. La taille de ces pores (102) permet de laisser passer le premier type de particule (104), sans distorsion ou avec une distorsion minime, et de laisser passer le second type de particule (108) uniquement avec une distorsion sensible. Compte tenu du dimensionnement précis des pores (102) de la membrane filtrante (100), les intervalles entre les pores (102) étant maintenus malgré un écart plus faible entre ceux-ci, la porosité de la membrane (100) peut être relativement plus importante, ce qui permet d'utiliser des vitesses de filtrage plus élevées tout en réduisant la durée d'exposition au cisaillement, c'est-à-dire les dégâts causés aux particules. On décrit par ailleurs divers procédés utilisables pour éviter l'encrassement de la membrane (100).

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