Flow Balancing Devices, Methods, and Systems

A medical treatment method, comprising:

• at treatment times, using peristaltic pumps, flowing medicament into and out of inflow and outflow channels connectable to a patient or treatment device;
• at calibration times, over a calibration interval of less than a minute, flowing medicament directly between the inflow and outflow channels such that pulsations generated by the peristaltic pumps cause pressure in a bridge channel between the inflow and outflow channels to fluctuate due to a superposition of a suction side pulsation and a pressure side pulsation of respective ones of said peristaltic pumps;
• and
• using an adjustable flow restrictor, selecting a suction head of at least one of the respective ones of the peristaltic pumps so as to change a pulsation frequency thereof so that it differs from that of the other of the ones of the peristaltic pumps by a predetermined amount.