Patent ID: 7914681

Claim:
A method of hemodialysis performed by a hemodialyzer apparatus, the apparatus comprising: a hemodialyzer for bringing blood into contact with a dialysis fluid through a translucent membrane to purify the blood; a first blood circuit having a blood pump for guiding blood taken out from a living body into the hemodialyzer; a second blood circuit having means for guiding the blood refluxing from the hemodialyzer to the living body; a dialysis fluid supply circuit having a dialysis fluid supply pump for guiding the dialysis fluid into the hemodialyzer; a dialysis fluid discharge circuit having a dialysis fluid discharge pump for discharging the dialysis fluid refluxing from the hemodialyzer; at least one bypass circuit having a fluid feed pump capable of rotating forwardly and backwardly, wherein each one of the at least one bypass circuit is coupled to one of either the dialysis fluid supply circuit or the dialysis fluid discharge circuit to bypass, respectively, the dialysis fluid supply pump or the dialysis fluid discharge pump; and a controller for controlling hemodialyzer operations; the method comprising the steps of: alternately repeating a back-filtration operation and a filtration operation with an intermediary blank time therebetween, during which neither the filtration operation nor the back-filtration operation are performed; the controller rotating the fluid feed pump in the same direction as the direction of a direction of the dialysis fluid supply pump for a back-filtration operation when the bypass circuit bypasses the dialysis fluid supply circuit; the controller rotating the fluid feed pump in the opposite direction as a direction of the dialysis fluid discharge pump for a back-filtration operation when the bypass circuit bypasses the dialysis fluid discharge circuit; the controller rotating the fluid feed pump in the opposite direction as the direction of a direction of the dialysis fluid supply pump for a filtration operation when the bypass circuit bypasses the dialysis fluid supply circuit; the controller rotating the fluid feed pump in the same direction as a direction of the dialysis fluid discharge pump for a filtration operation when the bypass circuit bypasses the dialysis fluid discharge circuit; and the controller pausing rotation of the fluid feed pump for the blank time to allow back-filtered fluid to enter the living body.