Method for assessing a measured pressure value, and apparatuses

A method for assessing a measured pressure value, the method comprising:

• providing a blood treatment apparatus, connectable to a blood tubing set comprising an arterial blood line and a venous blood line, the blood treatment apparatus comprising:
• a blood pump for conveying blood extracorporeally along the arterial blood line, an arterial pressure meter for measuring an arterial pressure in the arterial blood line and/or a venous pressure meter for measuring a venous pressure in the venous blood line, wherein the arterial pressure meter and/or the venous pressure meter are configured to determine at least one pressure measurement value,
• an alarm output device to output an alarm based on the at least one pressure measurement value, in an alarm event, and
• a control device for controlling or regulating the blood pump;
• providing an alarm criterion memory for storing a predetermined alarm criterion which defines an alarm event;
• providing a reference data memory which comprises at least one data set which contains one or more reference pressure profiles or reference pressure values or reference pressure ranges, wherein providing the reference data memory comprises:
• at a beginning of or a distinctive point of a treatment session, controlling the blood pump to convey blood along the arterial blood line at one or more reference conveying rates;
• at the beginning of or the distinctive point of the treatment session, measuring the pressure prevailing at the one or more reference conveying rates of the blood pump in the arterial blood line and/or venous blood line via the arterial pressure meter and/or the venous pressure meter while or for determining a reference pressure measurement value;
• and
• storing at least one data set in the reference data memory, the data set containing the one or more reference pressure measurement values, or at least one reference pressure profile created therefrom;
• measuring a prevailing pressure at an initial conveying rate of the blood pump in the arterial blood line and/or in the venous blood line via the arterial pressure meter and/or the venous pressure meter while determining the at least one pressure measurement value;
• assessing the at least one pressure measurement value based on the predetermined alarm criterion stored in the alarm criterion memory while or for determining whether the at least one pressure measurement value meets the alarm criterion and that, therefore, there is an alarm event;
• controlling the blood pump in order to convey at the one or more reference conveying rates along the arterial blood line, when the pressure measurement value meets the alarm criterion, wherein the one or more reference conveying rates, or at least one of the one or more reference conveying rates is less than the initial conveying rate;
• measuring the arterial pressure in the arterial blood line and/or the venous pressure in the venous blood line, respectively prevailing at the one or more reference conveying rates of the blood pump, using the arterial pressure meter and/or the venous pressure meter while determining at least one assessment pressure measurement value;
• evaluating the at least one assessment pressure measurement value based on, or via a comparison with, the data set stored in the reference data memory while determining at least one evaluation result;
• and
• outputting an alarm via the alarm output device only in the case that the evaluation result satisfies predetermined requirements for outputting an alarm.