What are closed loop systems?
www.diabetes.org.uk
Aug. 1, 2026, 7:39 a.m.
Closed loop systems represent an advancement in diabetes management, combining an insulin pump with a continuous glucose monitor that communicate through software on a phone, pump, or separate device. These hybrid closed loop systems automate insulin delivery to replicate pancreatic function, though they require user input such as carbohydrate counting, exercise logging, and meal-time insulin calculations. Available on the NHS with varying rollout stages across the UK and purchasable privately, hybrid closed loop systems offer significant benefits for type 1 diabetes patients. Research demonstrates improved quality of life, greater blood sugar stability, elimination of insulin injections, and reduced finger prick testing. The system automatically adjusts background basal insulin based on continuous glucose monitoring data while requiring users to input bolus insulin information for meals. Also known as automated insulin delivery or AID, these systems represent a practical solution that bridges automated technology with necessary manual management components, making diabetes care more manageable for patients and caregivers alike.