Method and device for filtering plasma

A - Human Necessities – 61 – M

Patent

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A61M 1/34 (2006.01)

Patent

CA 2083059

A plasma filtration method to separate blood into plasma and corpuscles with the primary filter and to remove high molecular weights substances as harmful components from said separated plasma by filtering said plasma with the secondary filter, in which an operation to open the inner chamber of the secondary filter to the atmosphere for lowering the pressure on every detection of the limit value of pressure rise caused by increase in clogging tendency in said filter and a further operation to clean said secondary filter from the sides of inner and outer chambers after lowering of pressure in the inner chamber are performed, whereby a loss of plasma caused by discharging said plasma to the outside of the system during the operation of unclogging the secondary filter can be reduced.

Procédé de filtration du plasma destiné à séparer le plasma sanguin des globules à l'aide d'un premier filtre et à enlever les substances de masse moléculaire élevée qui constituent des composants nocifs dudit plasma par filtration dudit plasma à l'aide d'un second filtre. Selon ce procédé deux opérations sont effectuées: une opération consistant à ouvrir la chambre intérieure du second filtre à l'atmosphère pour abaisser la pression chaque fois qu'une valeur limite d'augmentation de pression est détectée, augmentation due à une tendance à l'obstruction dans ledit filtre, et une opération consistant à nettoyer ledit second filtre à partir des côtés des chambres intérieure et extérieure après que la pression a été abaissée dans la chambre intérieure. Ainsi une perte de plasma dûe à la décharge dudit plasma vers l'extérieur du système pendant l'opération de désobstruction du second filtre peut être réduite.

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