System and method for detecting venous needle dislodgement

摘要

Systems and methods are disclosed for detecting an interruption of connection between a blood treatment apparatus and a patient blood circulation. The system includes a line shut-off for blocking the venous fluid line arranged between the blood treatment apparatus and a connector, an arterial fluid line arranged between the blood treatment apparatus and the patient blood circulation, a pressure sensor arranged in the venous fluid line or the arterial fluid line for measuring pressure, and a control and evaluation unit for evaluating a pressure curve in time of the pressure measured by the pressure sensor during blocking of the venous fluid line to detect an interruption or disturbance of the connection between the first connection means and the patient blood circulation.

主权项

1. A system for detecting an interruption of the connection between an extracorporeal blood treatment apparatus and an intracorporeal patient blood circulation to which the extracorporeal blood treatment apparatus is connectable or connected via a fluid connection means that is attachable or attached to a venous fluid line and via an arterial fluid line, comprising:
a line shut-off for blocking the venous fluid line arranged between the blood treatment apparatus and the fluid connection means; at least one blood pump arranged in the arterial fluid line configured for continuous blood delivery during blocking of the venous fluid line by the line shut-off; at least one pressure sensor arranged in at least one of the venous fluid line or the arterial fluid line for measuring the pressure prevailing in the at least one of the venous fluid line or the arterial fluid line; a control and evaluation unit adapted to evaluate a pressure curve in time of the pressure measured by the at least one pressure sensor during blocking of the venous fluid line to detect an interruption or disturbance of the connection between the fluid connection means and the patient blood circulation, for which the control and evaluation unit is configured;
to determine a variable representative of the pressure curve from the pressure curve;to compare the representative variable to at least one of a stored reference value or range of reference values; andto conclude the presence or absence of an interruption or disturbance of the connection of the venous fluid line between the blood treatment apparatus and the patient circulation as a result of the comparison.