Patent ID: 7303667

Claim:
A hemodialysis apparatus, comprising: a blood measuring means that measures a blood parameter, converts the blood parameter into a blood index value and conveys to a control member; and an actual working member that performs a blood treatment, wherein the control member sets up a target control line which consists of target blood index values determined previously at each measurement point of a lapsed time of hemodialysis processing and controls a water removal speed of the working member by a following formula (a): BV 0 {−(% Δ BV n−1′ −% Δ BV n′ )+(% Δ BV n′ −% Δ BV n+1 )}+ UFR n ×T=UFR n+1 ×T (a) wherein BV 0 is the blood volume at the time of the initiation of dialysis; % ΔBV n ′ is the blood volume change at an optional selected measurement point (n); % ΔBV n−1 ′ is the blood volume change at a measurement point (n−1), a point previous to the selected measurement point (n); % ΔBV n+1 is the blood volume change defined at a measurement point (n+1), a next point to carry out feed-forward control; T is the measurement time; UFR n is the water removal speed at a selected measurement point (n); UFR n+ 1 is the water removal speed defined when a control toward the working member is carried out, to attain the target blood indication level at a measurement point (n+1), a next point of the selected measurement point (n).