# Patient-specific deep offline artificial pancreas for blood glucose regulation in type 1 diabetes

## TL;DR

This paper introduces a personalized artificial pancreas system using AI to better regulate blood glucose levels in type 1 diabetes patients, especially during physical activity.

## Contribution

A novel framework combining systems biology-informed neural networks and deep reinforcement learning for patient-specific glucose regulation.

## Key findings

- The system improved insulin dosing and glucose control compared to existing methods.
- Patient-specific models accounted for carbohydrate intake and exercise intensity effectively.
- The framework reduced risks of hypoglycemia during physical activity.

## Abstract

Due to insufficient insulin secretion, patients with type 1 diabetes mellitus (T1DM) are prone to blood glucose fluctuations ranging from hypoglycemia to hyperglycemia. While dangerous hypoglycemia may lead to coma immediately, chronic hyperglycemia increases patients’ risks for cardiorenal and vascular diseases in the long run. In principle, an artificial pancreas – a closed-loop insulin delivery system requiring patients to manually input insulin dosage according to the upcoming meals – could supply exogenous insulin to control the glucose levels and hence reduce the risks from hyperglycemia. However, insulin overdosing in some type 1 diabetic patients, who are physically active, can lead to unexpected hypoglycemia beyond the control of the common artificial pancreas. Therefore, it is important to take into account the glucose decrease due to physical exercise when designing the next-generation artificial pancreas. In this work, we develop a framework integrating systems biology-informed neural networks (SBINN), deep reinforcement learning (RL) algorithms, and T1DM data collected from wearable devices, to automate insulin dosing for patients. In particular, we build patient-specific computational models using SBINN to mimic the glucose-insulin dynamics for a few patients from the dataset, by simultaneously considering patient-specific carbohydrate intake and physical exercise intensity. Our patient-specific artificial pancreas, based on two deep RL algorithms, provided better insulin dosage, leading to safer glucose levels compared to those in the original dataset.