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The development of novel diabetes monitoring sensors is important for the diabetes management of millions of diabetic patients. This work reports a flexible filamentary continuous glucose monitoring (CGM) sensor. A multilayer CGM sensor has been constructed on titanium filament with low cost and ease of use. The sensor, made of flexible material, offers better adaptability and comfort than traditional rigid filament CGM sensors, allowing continuous monitoring of subcutaneous blood glucose levels to provide patients with treatment strategies. The performance and reliability of the sensor were verified through rat experiments. The trend of the increase and decrease of the detected current was generally consistent with the actual blood glucose, and the detected values were located in regions A and B of the Clarke error grid. The results show that the sensor has the advantages of high sensitivity, high accuracy and fast response speed, which is suitable for monitoring the blood glucose level for a long time and has a broad application prospect in diabetes monitoring, exercise monitoring, health management and clinical application. [Display omitted] • This work reports a flexible filamentary continuous glucose monitoring (CGM) sensor. • A multilayer CGM sensor has been constructed on titanium filament with low cost and ease of use. • The performance of the sensor was verified through rat experiments with high reliability and accuracy. • The sensor has high sensitivity, high accuracy and fast response for monitoring interstitial glucose. [ABSTRACT FROM AUTHOR]