Glucose Control Startup Using Rate of Change Detection
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Solution Overview
Problem
Current closed-loop glucose control systems face challenges in effectively managing startup scenarios, particularly in transitioning from manual to automatic modes, which can lead to adverse events like severe hypoglycemia due to inadequate insulin delivery strategies.
Innovation Solution
A controller is configured to detect changes in blood glucose concentration and delay the initiation of automatic mode operation until a safe condition is met, using a proportional-integral-derivative (PID) control algorithm to manage insulin delivery without boluses during the transition phase, and adjust based on feedback signals to maintain stable glucose levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the system enters automatic mode immediately upon request, then the responsiveness and user control are improved, but the risk of hypoglycemia increases due to inadequate insulin delivery strategy
Solution Approach 1:
The system performs preliminary assessment of glucose trends before entering automatic mode. It evaluates whether glucose levels are decreasing at a safe rate and checks if a bolus was recently administered. Only when these preliminary conditions are met does the system transition to automatic mode, preventing immediate entry that could cause hypoglycemia.
Solution Approach 2:
The system dynamically adjusts the entry criteria based on real-time glucose measurements and rate of change. The transition to automatic mode is not static but adapts to the current physiological state, allowing entry only when glucose trends indicate safety margins are adequate.
2Reliability
If the system delays entry into automatic mode until glucose concentration is decreasing, then the safety against hypoglycemia is improved, but the response time to user request increases
Solution Approach 1:
The system continuously monitors glucose concentration and rate of change, using this feedback to determine when safe entry conditions are met. The feedback loop evaluates real-time physiological data to dynamically assess safety, allowing the system to transition as soon as conditions permit rather than using fixed delays.
Solution Approach 2:
The system changes its operational parameters (entry criteria) based on glucose trends. When glucose is decreasing at a safe rate, the system permits entry; when glucose is stable or increasing, entry is delayed. This parameter adaptation optimizes both safety and response time.
3Productivity
If bolus insulin is administered during startup phase, then the glucose control effectiveness is improved, but the risk of severe hypoglycemia increases
Solution Approach 1:
The system extracts the bolus delivery function during the startup phase and replaces it with purely infusion-based control. By removing bolus administration in this critical transition period, the system eliminates the sharp insulin spikes that could cause severe hypoglycemia while maintaining glucose control through adjusted infusion rates.
Solution Approach 2:
The system prepares for potential hypoglycemia by prohibiting bolus delivery during startup, creating a protective buffer against severe glucose drops. This preemptive measure cushions against the harmful effects of aggressive insulin delivery before the system fully transitions to automatic control.
Data Source
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AI summary
Disclosed are methods, systems, etc. for closed-loop glucose control startup. In certain example embodiments, a request for entry of an automatic mode of operation of a glucose monitoring and insulin delivery system for a patient may be detected. An entry of the automatic mode of operation may be controlled based, at least in part, on a detected rate of change of blood glucose concentration of the patient. In certain other example embodiments, initiation of a continual phase of an automatic mode of operation may be controlled based, at least in part, on a time since a most recent manual delivery of a bolus, on a detected rate of change of blood glucose concentration, on a targeted fixed set point, a combination thereof, and so forth.