Combined hemofiltration and hemodialysis system

A - Human Necessities – 61 – M

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A61M 1/14 (2006.01) A61M 1/30 (2006.01) A61M 1/34 (2006.01) A61M 1/36 (2006.01) A61M 1/10 (2006.01) A61M 1/16 (2006.01)

Patent

CA 2060902

A hemodialysis system has a blood circuit and a hemofiltrate circuit interconnected at a hemo-filter and an air collection chamber. If an infusion of sterile fluid to the returning blood is needed during the dialysis treatment, filtrate in the filtrate circuit is pumped back into the blood circuit. This is also done to purge the blood circuit of blood and return it to the patient at the conclusion of a dialysis treatment. A blood pump in the blood circuit incorporates a flexible vessel in conjunction with pinch valves which self expand in a controlled manner from a compressed condition to fill with blood from the patient in a suction stroke controlled by the patient's blood delivery rate. Compression of the vessel by an external member then forces the blood through the rest of the blood circuit:

Un système d'hémodialyse comporte un circuit sanguin ainsi qu'un système d'hémofiltrat reliés à un hémofiltre ainsi qu'à une chambre de récupération d'air. Si une injection de fluid stérile dans le sang de retour est nécessaire pendant le traitement de dialyse, le filtrat se trouvant dans le circuit de filtrat est pompé pour être renvoyé dans ledit circuit sanguin. On procède également à cette opération afin de débarrasser le circuit sanguin du sang, et de le renvoyer au patient à la fin d'un traitement de dialyse. Une pompe à sang se trouvant dans ledit circuit sanguin comporte un récipient souple combiné à des vannes de pincement, lesquelles se dilatent automatiquement de manière régulée à partir d'un état comprimé, pour se remplir du sang du patient en une aspiration régulée par la vitesse d'acheminement de sang du patient. La compression dudit récipient par un élément extérieur force ensuite le sang à passer par le reste dudit circuit sanguin.

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