Blood pump system

Abstract

A blood pump system that has a blood pump having a pump housing with a blood flow inlet and a blood flow outlet connected by a passage, a pump element disposed in said pump housing, a drive unit configured to drive the pump element at a set speed (Nset) so that a flow is generated between the blood flow inlet and the blood flow outlet; a sensor arrangement configured to sense at least one circulatory system related parameter (CSRP) at least intermittently; a controller configured to process the at least one circulatory system related parameter (CSRP); and a storage device configured to continuously store the processed at least one circulatory system related parameter; wherein the a controller is further configured to execute a weaning procedure in that i) a first sequence of the processed at least one circulatory system related parameter (CSRP) is stored in the storage device for a first time interval; ii) a first average value (AV1) for the first sequence is calculated; iii) the set speed (Nset) is reduced by a speed reduction value (dNR) after the first average value (AV1) is calculated; iv) a second sequence of the processed at least one circulatory system related parameter (CSRP) is stored in the storage device for a second time interval; v) a second average value (AV2) for the second sequence is calculated; vi) an comparison value (|Diff|) of the difference of the first average value (AV1) and the second average value (AV2) is compared with a predefined threshold value (TRCSRP); vii) wherein the controller is configured to repeat steps iv) to vi), and configured to increase a first counter (Cup) by 1 provided the comparison value (|Diff|) is within the predefined threshold value (TRCSRP), and configured to increase a second counter (Cdown) by 1 provided the comparison value (|Diff|) is outside the predefined threshold value (TRCSRP); and wherein the controller is configured to repeat steps i) to vii) and configured to set the first counter (Cup) to zero when the first counter (Cup) reaches a predefined first counter maximum value (TRCup), and wherein the controller is configured to increase the set speed (Nset) by a speed increase value (dN1) and configured to set the second counter (Cdown) to zero and configured to repeat steps iv) to vii) when the second counter (Cdown) reaches a predefined second counter maximum value (TRCdown).

Dependencies are inferred from the claim text.