Patent ID: 8672868
Filing Date: 2014-03-18
Classification: A61M

Abstract:
1. A method for operating blood pumps of an intra- or extra-corporeal blood pump circuit with the following process steps: a) determining a threshold value T from differential flow speed ratio variables of blood flowing through the blood pump circuit (DFSR variables), wherein individual DFSR variables are calculated from a quotient of a differential blood delivery capacity with respect to a corresponding differential blood pump speed, wherein the pump speed is gradually increased up to a value less than a predetermined blood flow of the blood pump circuit when the DFSR variables are obtained; b) subsequently reducing the blood pump speed and obtaining associated DFSR variables of blood flowing through the blood pump circuit while reducing the blood pump speed (determined DFSR variables); c) comparing the determined DFSR variables from process step b) with the threshold value T from process step a) in order to assess drainage flow of the blood pump circuit; d) changing the blood pump speed depending on whether the determined DFSR variables according to process step b) is greater than, equal to or less than the threshold value T to regulate blood flow through the blood pump circuit.