Monitoring device for recirculation analysis
AssigneeB. Braun Avitum AG
InventorsSilvie Krause, Henrik Wolff, Marten Jakob
Life of this patent
Estimating the term…
Abstract
A monitoring method for an extracorporeal blood treatment machine, a monitoring device of an extracorporeal blood treatment machine, and an extracorporeal blood treatment machine including a monitoring device. The monitoring device is configured to detect a signal representing a concentration of pollutants in a used dialysis liquid, to automatically evaluate a signal course with respect to at least one predetermined indicator for an existing recirculation, and to automatically initiate a recirculation measurement or automatically output a request for initiating a recirculation measurement to a user upon determination of the at least one indicator.
Claims11
An extracorporeal blood treatment machine comprising:
- a filter having a blood inlet line configured to receive blood from a patient, a blood outlet line configured to return the blood to the patient, a dialysis liquid inlet line configured to receive fresh dialysis liquid, a dialysis liquid outlet line configured to discharge used dialysis liquid, and a semipermeable membrane configured to filter pollutants from the blood into the fresh dialysis liquid to convert the fresh dialysis liquid into the used dialysis liquid;
- a measuring cell in the dialysis liquid outlet line;
- and
- a monitoring device operatively connected to the measuring cell, wherein the monitoring device is configured to:
- detect a signal from the measuring cell continuously representing a concentration of pollutants in the used dialysis liquid and to automatically evaluate a signal course with respect to at least one predetermined signal course indicator or signal course pattern for an existing blood recirculation;
- differentiate the signal for evaluation in order to calculate a differential signal and compare it with a threshold value, wherein a certain frequency or duration of threshold value overruns and/or a one-time threshold value overrun of said threshold value or of another threshold value is recognized as the at least one predetermined signal course indicator or signal course pattern for the existing blood recirculation;
- and
- automatically initiate a recirculation measurement or automatically output a request for initiating a recirculation measurement to a user upon determination of the at least one predetermined signal course indicator or signal course pattern.
A monitoring method for operating an extracorporeal blood treatment machine comprising:
- a filter having a blood inlet line configured to receive blood from a patient, a blood outlet line configured to return the blood to the patient, a dialysis liquid inlet line configured to receive fresh dialysis liquid, a dialysis liquid outlet line configured to discharge used dialysis liquid, and a semipermeable membrane configured to filter pollutants from the blood into the fresh dialysis liquid to convert the fresh dialysis liquid into the used dialysis liquid;
- a measuring cell in the dialysis liquid outlet line;
- and a monitoring device operatively connected to a measuring cell, the monitoring method comprising the steps of:
- detecting a signal course from the measuring cell representing a concentration of pollutants in a used dialysis liquid;
- automatically evaluating, by the monitoring device, the signal course with respect to at least one predetermined signal course indicator or signal course pattern for an existing blood recirculation;
- and
- automatically initiating, by the monitoring device, a recirculation measurement or outputting an automatic request for initiating a recirculation measurement to a user if the at least one predetermined signal course indicator or signal course pattern has been determined.
Dependencies are inferred from the claim text.