Patent ID: 8702979
Filing Date: 2014-04-22
Classification: A61M

Abstract:
1. An apparatus for determining a reduction ratio (RR) or a Kt/V value of a kidney substitution treatment comprising: a kidney substitution device; an external blood circuit which is connected to the kidney substitution device; a kidney substitution liquid conduit system which is connected to the kidney substitution device, a kidney substitution liquid source and a kidney substitution liquid drain wherein the kidney substitution liquid conduit system comprises a valve system to recirculate the effluent kidney substitution treatment liquid of the kidney substitution device to the kidney substitution device; a measuring device for determining spectrophotometric values of the effluent kidney substitution treatment liquid located at the outflow of the kidney substitution treatment liquid conduit between the kidney substitution device and the kidney substitution liquid drain such that the effluent kidney substitution liquid either has to pass the measuring device during recirculation or has to pass the measuring device as it flows into the kidney substitution liquid drain; and a computer, wherein the valve system comprises a first valve between the kidney substitution liquid source and the kidney substitution device, a second valve between the kidney substitution liquid drain and the kidney substitution device, and a third and fourth valve in a kidney substitution liquid circuit, wherein a pump recirculates the effluent kidney substitution treatment liquid against the blood flowing through the kidney substitution while the first valve and the second valve are closed and while the third and fourth valve are opened until the computer detects that the spectrophotometrical value of the effluent kidney substitution treatment liquid has reached a constant value A or the Kt/V value is determined by the computer with the equation