Method and apparatus for monitoring and optimizing blood circulation generated by a pump

摘要

In a device for the automatic control of blood pumps, an optimization of the blood flow is achieved by periodic speed interventions and flow changes thereby occurring, using a formed differential variable and a control algorithm. In addition, the location of possible flow resistances on the venous or arterial side can be ascertained.

主权项

1. A medical apparatus, the medical apparatus comprising:
an intra- or extra-corporeal blood pump circuit; a blood pump; and a control system, wherein the control system is configured to:
a) determine a threshold value T from differential flow speed ratio variables (DFSR variables) of blood flowing through the blood pump circuit, 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 blood 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 reduce 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) compare the determined DFSR variables with the threshold value T in order to assess drainage flow of the blood pump circuit;d) change the blood pump speed depending on whether the determined DFSR variables is greater than, equal to or less than the threshold value T to regulate blood flow through the blood pump circuit.