George, V I and Kamath, Surekha (2008) Blood Glucose Control In Type I Diabetics: An Output Feedback Approach. In: International Conference on Biomedical Engineering, 25-28, Kuala Lumpur.

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Abstract

A robust Hinfinity controller was developed to deliver insulin via a mechanical pump in Type I diabetic patients. A fundamental nonlinear diabetic patient model was linearized and then reduced to a third-order linear form for controller synthesis. Hinfinity control was applied for the insulin delivery to prevent the hyperglycemic levels in Type I diabetic patient. Uncertainty in the nonlinear model was characterized by up to ±40% variation in eight physiological parameters. A sensitivity analysis identified the three parameter set having the most significant effect on glucose and insulin dynamics over the frequency range of interest [0.02 0.2](rad/min). This uncertainty was represented in the frequency domain and incorporated in the controller design. The controller performance was assessed in terms of its ability to track a normoglycemic set point (81.1mg/dL) in response to a 50 g meal disturbance. In the nominal continuous-time case, controller maintained glucose concentrations within ± 3.3 mg/dL of set point. A controller tuned to accommodate uncertainty yielded a maximum deviation of 17.6 mg/dL for the worst-case parameter variation.

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