Background: Patch pumps are a relatively new method of Insulin delivery. This study explores the accuracy of patch-pumps by reporting on comparative pulse-accuracy study of two patch pumps. Methods: The accuracy of two patch pumps (Cellnovo, [Cellnovo Ltd., Swansea, UK] and OmniPod® [Ypsomed Ltd, Escrick, UK]) was evaluated micro-gravimetrically. Pulse accuracy was analysed by comparing single and time-averaged pulses for each device. Results: Single-pulses outside accuracy thresholds ±5%, ±10%, ±15%, ±20%, ±25% and ±30% were: Cellnovo; 79.6%, 55.6%, 35.0%, 19.9%, 9.7% and 4.3%; OmniPod; 86.2%, 71.6%, 57.4%, 45.5%, 35.2% and 25.4%. For 10, 20 and 40 pulse-windows mean values outside ±15% accuracy level were: Cellnovo; 7.3%, 1.5% and 0.4%, OmniPod; 37.6%, 31.8% and 25.9. Conclusions: This study showed that not all patch pumps are the same. The pumping mechanisms employed in these pumps play a significant role in the accuracy and precision of such devices.
Keywords: Insulin; accuracy; patch; pulse; pump; subcutaneous insulin infusion.