Patent ID: 8676512
Filing Date: 2014-03-18
Classification: A61M

Abstract:
1. A method for determining the transmembrane pressure during an extracorporeal blood treatment, in which blood flows, on a blood side, at a specific blood flow rate via an arterial blood supply line of an extracorporeal blood circuit into the inlet of a first chamber of a dialyzer divided by a semipermeable membrane into the first chamber and a second chamber and flows via a venous blood return line from the outlet of the first chamber of the dialyzer, and dialyzing fluid flows, on a dialyzing fluid side, via a dialyzing fluid supply line into the inlet of the second chamber of the dialyzer and flows via a dialyzing fluid discharge line out of the outlet of the second chamber of the dialyzer, fluid being withdrawn from the blood at a specific flow rate via the membrane of the dialyzer, comprising: measuring the pressure on the blood side at the inlet or outlet of the first chamber of the dialyzer and on the dialyzing fluid side at the inlet and/or outlet of the second chamber of the dialyzer, or measuring the pressure on the blood side at the inlet and/or outlet of the first chamber of the dialyzer and on the dialyzing fluid side at the inlet or outlet of the second chamber of the dialyzer; determining a variable correlating with the viscosity of the blood; determining a correcting quantity for the transmembrane pressure, the correcting quantity being dependent on the variable correlating with the viscosity of the blood; and calculating the transmembrane pressure on the basis of the pressure measured on the blood side and the dialyzing fluid side and the correcting quantity for the transmembrane pressure.