Monitor Electrode Calibration for Accurate Glucose Sensing

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing medical devices, such as continuous glucose monitors, face challenges in accurately measuring glucose levels due to environmental effects on their electrodes during sterilization, shipping, and storage processes, which are not accounted for in the initial calibration.

Innovation Solution

The system includes monitor electrodes with the same or different chemistry stacks as working electrodes, allowing processing circuitry to measure and calibrate operating parameters before installation, determining delta values to update the calibration based on actual environmental conditions, ensuring accurate glucose level measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If initial calibration is performed after assembly, then manufacturing efficiency is improved, but measurement precision deteriorates due to unaccounted environmental effects

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidglucose level measurement accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by performing calibration measurements on monitor electrodes before the chemistry stack is exposed to environmental conditions during sterilization, shipping, and storage. The system captures baseline operating parameters (impedance, capacitance, resistance) of monitor electrodes that have the same chemistry stack as working electrodes, then uses these pre-calibration values to compensate for environmental effects later, maintaining both manufacturing efficiency and measurement precision

Inventive Principle:

Principle #10Preliminary action

2Ease of manufacture

If sterilization and shipping processes are standardized, then ease of manufacture is improved, but measurement precision deteriorates due to environmental effects on electrodes

Engineering Contradiction:

Improvestandardization of processingVSAvoidelectrode calibration accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent introduces monitor electrodes as an intermediary element that has the same chemistry stack as working electrodes but is used specifically for calibration purposes. These monitor electrodes serve as mediators to measure environmental effects separately, allowing the working electrodes to maintain their glucose sensing function while the monitor electrodes provide calibration data to compensate for environmental degradation

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If calibration is performed only once after assembly, then device complexity is reduced, but reliability deteriorates due to environmental changes

Engineering Contradiction:

Improvecalibration procedure simplicityVSAvoidmeasurement consistency

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements feedback by continuously monitoring the operating parameters of monitor electrodes and using these measurements to update calibration factors. The system compares pre-calibration values with post-environmental exposure values, calculates delta values, and applies compensation factors to working electrode measurements in real-time, creating a closed-loop feedback system that maintains reliability without significantly increasing complexity

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach provides more accurate glucose level readings by accounting for changes in electrode chemistry stacks due to environmental factors, improving the reliability of continuous glucose monitoring systems.

Implementation Method 1

the one or more monitor electrodes may have the same chemistry stack as the one or more working electrodes, one or more different chemistry stacks, or a combination thereof

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 2

the medical device may be exposed to different environments that may alter the sensing properties of the working electrodes

Methodology Applied

Scientific EffectAbsorption (physical): Absorption (physical)

Data Source

PatentUS12558004B2Sensor device monitors for calibration

Publication Date: 2026.02.24 MEDTRONIC MINIMED INC

AI summary

A system for monitoring glucose includes processing circuitry and a glucose monitor comprising one or more monitor electrodes and one or more working electrodes, wherein a first chemistry stack is disposed on at least one of the monitor electrode(s) and a second chemistry stack is disposed on at least one of the working electrode(s) is described herein. The processing circuitry may be configured to measure one or more calibration values of an operating parameter of the monitor electrode(s), retrieve one or more pre-calibration values of the operating parameter of the monitor electrode(s), wherein the pre-calibration value(s) were measured before the calibration value, determine one or more delta values using the calibration value(s) and the pre-calibration value(s), and calibrate glucose values sensed by the working electrode(s) using the delta value(s).