Patent ID: 8512271

Claim:
A system for pre-setting a flow rate for an extracorporeal blood-treating apparatus comprising a dialyser divided into a blood chamber and a dialysis chamber by a semi-permeable membrane, wherein blood flows through the blood chamber and dialysis fluid flows through the dialysis chamber, said system comprising a means for selecting an optimum flow rate, said means for selecting an optimum flow rate being selected from the group consisting of: a means for selecting an optimum dialysis fluid flow rate Q dopt as a function of a pre-set blood flow rate Q b , wherein Q dopt for the pre-set blood flow rate Q b is a solution for Q dopt such that if Q dopt were increased by a first given amount, a metric characteristic of the effectiveness of the blood treatment would increase by approximately a second given amount; and a means for selecting an optimum blood flow rate Q dopt as a function of a pre-set dialysis fluid flow rate Q d , wherein Q bopt for the pre-set dialysis fluid flow rate Q d is a solution for Q bopt such that if Q bopt were increased by a third given amount, a metric characteristic of the effectiveness of the blood treatment would increase by approximately a fourth given amount, wherein the means for selecting Q dopt or the means for selecting Q bopt is a calculating unit configured such that Q dopt or Q bopt is calculated from a mathematical equation by an iterative approximate solution method.