US 12,138,375 B2
Method and apparatus for monitoring the membrane coupling in a pressure measurement system
Pascal Kopperschmidt, Dittelbrunn (DE)
Assigned to FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH, Bad Homburg (DE)
Appl. No. 17/442,680
Filed by Fresenius Medical Care Deutschland GmbH, Bad Homburg (DE)
PCT Filed Mar. 20, 2020, PCT No. PCT/EP2020/057727
§ 371(c)(1), (2) Date Sep. 24, 2021,
PCT Pub. No. WO2020/193388, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 10 2019 107 604.8 (DE), filed on Mar. 25, 2019.
Prior Publication US 2022/0184291 A1, Jun. 16, 2022
Int. Cl. A61M 1/36 (2006.01)
CPC A61M 1/3641 (2014.02) [A61M 2205/18 (2013.01); A61M 2205/3331 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for monitoring the membrane coupling in a pressure measurement system in an extracorporeal circuit of a blood treatment machine comprising the steps:
detecting periodic pressure pulses occurring in the extracorporeal circuit;
a frequency analysis based on the detected periodic pressure pulses for calculating at least one Fourier coefficient;
comparing the at least one calculated Fourier coefficient with respect to its intensity with at least one associated reference value; and
outputting a signal when the comparison shows that, with respect to its intensity, the at least one Fourier coefficient differs from the associated reference value beyond a predetermined tolerance threshold value.