Method and System for Providing Sensor Redundancy
First Claim
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1. A method of sensing blood glucose values using redundant sensors, comprising:
- obtaining a first glucose reading from a first glucose sensor located at a first site;
obtaining a second glucose reading from a second glucose sensor located at a second site;
deriving a first predictive value to the first glucose reading using the second glucose reading as an input;
deriving a second predictive value to the second glucose reading using the first glucose reading as an input;
determining a first error between the first predictive value and the first glucose reading;
determining a second error between the second predictive value and the second glucose reading;
comparing a sum of the absolute error values of the first and second errors to a threshold; and
determining a failing sensor exists if the sum of the absolute error values exceed the threshold.
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Abstract
A closed loop system or semi-closed loop system for infusing insulin using sensor values applies a redundant sensor system as a fail-safe method against sensor failure. The redundant glucose sensors are used corroborate each other and a failing sensor is detected if the sensors no longer corroborate each other. The use of redundant sensors has the additional benefit of producing better sensor signals compared to the use of a single sensor.
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20 Claims
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1. A method of sensing blood glucose values using redundant sensors, comprising:
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obtaining a first glucose reading from a first glucose sensor located at a first site; obtaining a second glucose reading from a second glucose sensor located at a second site; deriving a first predictive value to the first glucose reading using the second glucose reading as an input; deriving a second predictive value to the second glucose reading using the first glucose reading as an input; determining a first error between the first predictive value and the first glucose reading; determining a second error between the second predictive value and the second glucose reading; comparing a sum of the absolute error values of the first and second errors to a threshold; and determining a failing sensor exists if the sum of the absolute error values exceed the threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A closed loop system or semi-closed loop system for infusing insulin using sensor values comprising:
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a first glucose sensor located at a first site generating a first blood glucose reading; a second glucose sensor located at a second site generating a second blood glucose reading; a controller to determine whether the first blood glucose reading or the second blood glucose reading is a more reliable blood glucose reading; and an infusion pump delivering insulin based on the more reliable blood glucose reading. - View Dependent Claims (11, 12)
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13. A system of sensing blood glucose values using redundant sensors, comprising:
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means for obtaining a first glucose reading from a first glucose sensor located at a first site; means for obtaining a second glucose reading from a second glucose sensor located at a second site; means for deriving a first predictive value to the first glucose reading using the second glucose reading as an input; means for deriving a second predictive value to the second glucose reading using the first glucose reading as an input; means for determining a first error between the first predictive value and the first glucose reading; means for determining a second error between the second predictive value and the second glucose reading; means for comparing a sum of the absolute error values of the first and second errors to a threshold; and means for determining a failing sensor exists if the sum of the absolute error values exceed the threshold. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification