Detecting blood path disruption in extracorpreal blood processing

摘要

A device monitors a blood path from a blood vessel access of a human subject through an extracorporeal blood processing apparatus and back to the blood vessel access. A pumping device in the blood path is operable to pump blood through the blood path from the blood withdrawal device to the blood return device. The monitoring device obtains pressure data from a pressure sensor arranged upstream of the pumping device in the blood path, and processes the pressure data for detection of a disruption of the blood path downstream of the pumping device, e.g. caused by VND (Venous Needle Dislodgement). The disruption is detected by evaluating presence/absence of cross-talk pulses at the pressure sensor, where the cross-talk pulses originate from one or more pulse generators in the extracorporeal blood processing apparatus and have propagated on a propagation path in a direction downstream of the pumping device through the blood return device, the blood vessel access and the blood withdrawal device to the pressure sensor.

主权项

1. A monitoring device for monitoring a blood path extending from a blood vessel access of a human subject through an extracorporeal blood processing apparatus and back to the blood vessel access, wherein the blood path comprises a blood withdrawal device and a blood return device for connection to the blood vessel access, and a pumping device operable to pump blood through the blood path from the blood withdrawal device to the blood return device, said monitoring device comprising:
an input for obtaining pressure data from a pressure sensor arranged upstream of the pumping device in the blood path to detect pressure pulses in the blood pumped through the blood path; and a signal processor connected to said input and being configured to: generate, based on the pressure data, a time-dependent monitoring signal comprising cross-talk pulses that originate from one or more pulse generators in the extracorporeal blood processing apparatus and have propagated in a direction downstream of the pumping device through the blood return device, the blood vessel access and the blood withdrawal device to the pressure sensor, process the monitoring signal for calculation of a parameter value that indicates a presence or absence of the cross-talk pulses, and detect, based at least partly on the parameter value, a disruption of the blood path downstream of the pumping device.