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FlexTouch® (Novo Nordisk A/S, Bagsvaerd, Denmark) is a pen-injector with a torque spring mechanism requiring a low activation force. This laboratory-based study compared the activation force of FlexTouch during the injection of insulin with different needles and at temperature conditions within the range at which the device is recommended for use. Using a tensile tester, activation force was measured at maximum dose settings for insulin detemir (100 U/mL) and insulin degludec (100 and 200 U/mL) at standard (23°C ± 5°C), cool (5°C ± 3°C), and warm (30°C ± 2°C) conditions. Activation force was measured with two 32-gauge needles differing in internal diameter at standard conditions. At standard, cool, and warm conditions, estimated mean activation forces with 95% confidence interval were 5.71 newtons (N) (5.63-5.79), 5.94 N (5.83-6.06), and 5.69 N (5.58-5.80) with insulin detemir, 5.53 N (5.45-5.62), 5.56 N (5.44-5.67), and 5.33 N (5.22-5.44) with 100 U/mL insulin degludec, and 5.53 N (5.45-5.61), 5.83 N (5.71-5.94), and 5.56 N (5.45-5.68) with 200 U/mL insulin degludec, respectively. Mean activation forces were observed to be low with very small variability between measurements; however, the differences between insulins and temperature conditions were statistically significant. The activation force required by FlexTouch remained low across all situations tested. The differences between activation force needed with different insulins and temperature conditions were small and unlikely to be clinically meaningful.

FlexTouch: An Insulin Pen-Injector with a Low Activation Force Across Different Insulin Formulations, Needle Technologies, and Temperature Conditions