Analyte Sensor MRI Interference Correction

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Solution Overview

Problem

Continuous glucose monitors (CGMs) are affected by the strong magnetic fields of magnetic resonance imaging (MRI) procedures, leading to inaccurate readings and requiring users to avoid MRIs, which limits their usability during radiologic procedures.

Innovation Solution

A method that involves receiving analyte data and temperature data from a sensor in contact with bodily fluid, determining the rate of change of temperature data, and if it exceeds a predetermined threshold, confirming user exposure to a radiologic procedure and adjusting the analyte data accordingly to mitigate any inaccuracies caused by the MRI exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If CGM sensor control device is worn during MRI procedure, then continuous glucose monitoring is maintained, but analyte reading accuracy deteriorates due to magnetic field interference

Engineering Contradiction:

Improvecontinuous monitoring durationVSAvoidanalyte reading accuracy

Core Design Contradiction:

Duration of action of stationary objectVSMeasurement precision

Solution Approach 1:

The system performs preliminary detection of temperature changes that indicate MRI exposure before analyte readings become corrupted. By detecting the thermal effect of MRI on the sensor earlier, the system can flag and exclude affected analyte readings, maintaining continuous monitoring while preserving accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses temperature sensor feedback to continuously monitor conditions around the analyte sensor. When temperature changes exceed a threshold indicating MRI exposure, the system adjusts its analyte reading validation accordingly, excluding readings taken during MRI procedures while maintaining readings from normal conditions.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If user avoids MRI procedures, then analyte reading accuracy is maintained, but usability and convenience deteriorate

Engineering Contradiction:

Improveanalyte reading accuracyVSAvoidusability during radiologic procedures

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The system converts the harmful thermal effect of MRI on the sensor into a useful indicator. By using the temperature change caused by MRI as a detection signal, the system automatically identifies when MRI procedures are occurring and excludes only those specific corrupted readings, allowing users to undergo MRI without compromising overall monitoring accuracy or usability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If temperature threshold for MRI detection is lowered, then MRI exposure detection sensitivity increases, but false positive rate increases

Engineering Contradiction:

ImproveMRI exposure detection sensitivityVSAvoidfalse positive rate

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The system dynamically adjusts the temperature threshold parameter based on baseline conditions and individual sensor characteristics. Rather than using a fixed threshold, the system establishes a baseline temperature and detects deviations that are characteristic of MRI exposure, reducing false positives while maintaining sensitivity to actual MRI events.

Inventive Principle:

Principle #35Parameter changes

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 solution allows CGMs to continue functioning during MRI procedures by adjusting the analyte data to account for the interference caused by the MRI's magnetic fields, ensuring more accurate glucose monitoring and improved patient safety.

Implementation Method 1

a sensor, such as a dermal sensor that senses a user's analyte level in a bodily fluid

Methodology Applied

Scientific EffectElectrochemical reaction:

Implementation Method 2

receiving a plurality of temperature data for the first time period from a temperature sensor

Methodology Applied

Scientific EffectThermal detection:

Data Source

PatentUS20250152052A1Systems, devices, and methods for an analyte sensor

Publication Date: 2025.05.15 ABBOTT DIABETES CARE INC

AI summary

A method comprising receiving a plurality of analyte data over a first time period monitored by an analyte sensor in fluid contact with bodily fluid under a skin surface, the plurality of analyte data corresponding to an analyte level, receiving a plurality of temperature data over the first time period from a temperature sensor, determining a rate of change of the plurality of temperature data over the first time period, if the determined rate of change of the plurality of temperature data is above a predetermined threshold, receiving user input to confirm exposure to radiologic procedure during the first time period, and adjusting the plurality of analyte data over the first time period based on the confirmed exposure to radiologic procedure.