Method and apparatus for detecting decreased dialysis performance due to clotting

摘要

Detecting performance of dialyzer in a device, involves measuring pressure of dialyzate in blood side of at least one pressure sensor, measuring UV absorbance of at least one uremic substance from predefined number (n) of measured pressure values ??(Px), calculating base line compensation line, calculating tolerance range, and detecting whether the measured UV absorbance is within the calculated range of tolerance. Method for detecting performance of dialyzer in a device for extracorporeal cleaning of blood, involves measuring pressure of dialyzate in blood side of at least one pressure sensor, measuring UV absorbance of at least one uremic substance from predefined number (n) of measured pressure values ??(Px), where x is number of pressure measurements, calculating base line compensation line, calculating tolerance range for the measured UV absorbances from a predefined number (m) of measured UV absorbances (Ay) by extrapolating a future UV absorbance (Ay+1 (calculated)), where y is the number of UV measurements and it is determined if the measured pressure value (P) is within the calculated range of tolerance about the base line, and detecting whether the measured UV absorbance (Ay+1 (measured)) is within the calculated range of tolerance for the calculated UV absorbance (Ay+1 (calculated)) , where performance is detected when the measured pressure value (P) lies outside the calculated tolerance area around the base line, and the measured UV absorbance (Ay+1) out of the calculated tolerance zone for the calculated UV absorbance. An independent claim is included for device for extracorporeal cleaning of blood.