z The principle of VCS (Viscous Control System)
Dialysate mixing
As shown in the below Fig., water is supplied to the right side of the viscous chamber.
By upward movement of piston of the viscous pump during temporally stop of the water
supply, A concentrate (for bicarbonate dialysis) of a volume corresponding to the piston
stroke is aspirated in the right side. By changing the piston stroke, dialysate
concentration can be changed. During the supply and aspiration, used dialysate is
drained from the left side.
UF control
As shown in the below Fig., fresh dialysate prepared in the right side is transferred to
the left side through dialyzer by operating the pump. By upward movement of piston of
the viscous pump, capacity of closed circuit (shown as bold lines) is increased,
generating negative pressure in dialysate compartment of the dialyzer. As the result,
fluid of a volume corresponding to the piston movement is removed from blood. By
changing the piston stroke, it is possible to change UF.
The system is build up so that dialysate preparation and UF control cycle is alternating,
which means that two sets are provided in the system.
【US and JAPAN PATENTS】
4-4
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