| CPC A61M 1/1605 (2014.02) [A61M 1/341 (2014.02); A61M 1/367 (2013.01); A61M 1/1656 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/702 (2013.01)] | 26 Claims |
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1. A method for checking or monitoring conveying or conveyance accuracy of conveying devices of a group of conveying devices, the group consisting of: a first conveying device, a second conveying device, and a third conveying device of a blood treatment apparatus for the extracorporeal blood treatment, the method comprising:
a) providing a completely liquid-filled receptacle which is in fluid communication with every conveying device of the group of conveying devices;
b) setting a predetermined initial pressure in the receptacle or measuring the pressure prevailing therein by a first pressure measurement and defining the measured pressure as an initial pressure, wherein the initial pressure corresponds to the receptacle being completely liquid-filled;
c) actuating one conveying device of the group of conveying devices such that the one conveying device accomplishes a target conveying activity required with respect to the one conveying device in order to convey a predetermined liquid volume out of the receptacle; and
d) measuring, in a second pressure measurement, the pressure prevailing in the receptacle after the target conveying activity of the one conveying device has been completed, wherein the second pressure measurement is an end pressure,
wherein:
the sequence of steps a) to d) is carried out successively for each conveying device of the group of conveying devices, wherein the predetermined initial pressure is the same for each sequence of steps performed by each of the conveying devices of the group of conveying devices,
for conveying by the first conveying device a first end pressure is determined, a first pressure difference between the initial pressure and the first end pressure is determined, and/or a first compliance is determined, the first compliance being a ratio of a change of liquid volume in the container caused by the first conveying device and the first pressure difference,
for conveying by the second conveying device a second end pressure is determined and a second pressure difference between the initial pressure and the second end pressure is determined and/or a second compliance is determined, the second compliance being a ratio of a change of liquid volume in the container caused by the second conveying device and the second pressure difference, and
for conveying by the third conveying device a third end pressure is determined, a third pressure difference between the initial pressure and the third end pressure, and/or a third compliance is determined, the third compliance being a ratio of a change of liquid volume in the container caused by the third conveying device and the second pressure difference; and
the method further comprises: in response to determining that (i) at least one of the first end pressure, the second end pressure or the third end pressure falls outside a first predetermined range or value, (ii) at least one of the first pressure difference, the second pressure difference or the third pressure difference falls outside a second predetermined range or value, or (iii) at least one of the first compliance, the second compliance or the third compliance falls outside a third predetermined range or value: (i) emitting an acoustic and/or optical alarm, or (ii) stopping or preventing the extracorporeal blood treatment from being carried out by the blood treatment apparatus.
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