Inspired by incidents where patients suffered excessive blood leakage and shock due to loosened blood catheters, we designed a new device. Causes of catheter loosening include agitation, accidental pulling, improper fixation, and lack of monitoring. We identified two main leakage points: the indwelling needle connector and the junction of connecting tubes. Current devices only notify medical personnel remotely but cannot stop leakage immediately. Our device detects leaks, notifies staff, and com