Patent ID: 6042784
Filing Date: 2000-03-28
Classification: A61M

Abstract:
A method for ultrafiltration in hemodialysis for use with a dialyzer subdivided by a semipermeable membrane into a blood chamber and a dialysis chamber, a dialysis fluid balancing device having a first dialysis fluid balance chamber subdivided by a moveable partition into a first and a second portion, and an ultrafiltrate balancing device having an ultrafiltrate balance chamber having a first and a second ultrafiltrate balance chamber portion, wherein blood passes in a blood circulation through the blood chamber, wherein dialysis fluid passes through the dialysis fluid chamber in a dialysis fluid path so that a fresh dialysis fluid flows into the dialysis fluid chamber and a spent dialysis fluid flows out of the dialysis fluid chamber, and wherein an ultrafiltrate may be removed from the dialysis fluid path, the method comprising the steps of:balancing the fresh dialysis fluid and spent dialysis fluid in the dialysis fluid balancing device;during a first cycle, sending spent dialysis fluid into the first ultrafiltrate balance chamber portion, so that substituate is diverted from the second ultrafiltrate balance chamber portion; andduring a second cycle, sending substituate into the second ultrafiltrate balance chamber portion, so that spent dialysis fluid from the first ultrafiltrate balance chamber portion is diverted.