Automatic Detection System for Needle Dislodgement During Blood Purification Therapy

Accidental needle dislodgement during blood purification therapy poses significant risks to patients. In this study, we introduce a novel system that can automatically detect indwelling needle dislodgements. By leveraging electrostatic capacitive coupling, this system creates an electrical connection between the dialysis circuit and the patient, obviating the need for direct electrode-blood contact. Changes in impedance between electrodes form the foundation for detection. When connected to hospital Local Area Networks (LANs), this system facilitates remote monitoring of needle status. Upon detecting a dislodgement, the system stops the blood pump, displays an alert on its web interface, and activates an auditory alarm. A statistical analysis of 60,000 regular instances and 10,000 needle dislodgement events demonstrated a significant difference in impedance between the two conditions (p < 0.01). As a result, this method bolsters safety in blood purification treatments.