Method and system for management of diabetes with a glucose monitor and infusion pump to provide feedback on bolus dosing
Described and illustrated is a system for management of diabetes that includes an infusion pump, glucose sensor and controller with a method programmed into the controller. The infusion pump is configured to deliver insulin to a subject. The system provides the user with the ability to understand the effects of bolus insulin dosing upon their glucose levels. Specifically, the system provides a message that must include: (a) the trend of the user's glucose; (b) the recommended bolus; and (c) the actual bolus.
1. A method for operating a diabetes management system having an infusion pump, at least one glucose monitor and a microcontroller, the method comprising the following steps performed with the microcontroller:
determining a glucose measurement in which a fluid sample with glucose is transformed into enzymatic byproducts by application of electrical signals to the sample;
calculating a bolus recommendation based on the glucose measurement made by the determining step;
evaluating whether the bolus recommendation was followed by a user of the system;
in the event the bolus recommendation was not followed by the user then:
storing the actual bolus delivered by the infusion pump;
measuring the glucose value in subsequent fluid samples and if the glucose values over time is greater than a predetermined high trend threshold then annunciating a high glucose trend, along with the recommended bolus and the actual bolus delivered by the pump otherwise if the glucose values over time is less than a predetermined low trend threshold then annunciating a low glucose trend along with both the recommended bolus and the actual bolus delivered by the pump.
2. The method of claim 1 , further comprising the step of storing the glucose measurement made by the measuring step in the controller.
3. The method of claim 1 , further comprising the step of ascertaining a need for another bolus recommendation due to an input to the controller.
4. The method of claim 1 , in which the ascertaining comprises a declining rate of change in the glucose measurements of fluid samples of the user.
5. The method of claim 1 , in which the glucose monitor comprises a continuous glucose monitor and the microcontroller comprises a closed-loop controller.
6. The method of claim 5 , in which the annunciating of the high glucose trend comprises displaying a message that a trend of glucose measurements is increasing after a bolus delivery along with both the recommended bolus and the actual bolus delivered.
7. The method of claim 5 , in which the annunciating of the low glucose trend comprises displaying a textual message that a trend of glucose measurements is decreasing after a bolus delivery along with both the recommended bolus and the actual bolus delivered.
8. The method of claim 1 , in which the low trend threshold comprises a decreasing rate of glucose concentration about 20 mg/dL every thirty minutes and the high trend threshold comprises an increasing rate of change of glucose concentration of about 20 mg/dL every thirty minutes.