Implantable Glucose Sensor Feedback for Sensitivity Loss Detection

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Solution Overview

Problem

Conventional implantable glucose sensors face challenges in accurately tracking blood glucose levels due to in vivo physiological responses such as dip and recover, biofouling, and encapsulation, which lead to reduced sensitivity and inaccurate data over time.

Innovation Solution

The method involves processing data from a continuous glucose sensor to identify and respond to transient losses in sensitivity by detecting events like cessation of blood flow, vasospastic events, and biofouling, using processor modules to adjust sensor data processing based on severity and employing bio-active agents to mitigate these issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If implantable glucose sensors are used for continuous monitoring, then glucose data can be obtained continuously, but sensor accuracy deteriorates over time due to dip and recover, biofouling, and encapsulation

Engineering Contradiction:

Improvecontinuous monitoring durationVSAvoidsensor accuracy

Core Design Contradiction:

Duration of action of moving objectVSMeasurement precision

Solution Approach 1:

The system continuously monitors sensor signal quality metrics and provides feedback to detect when dip and recover, biofouling, or encapsulation occurs. This feedback mechanism enables real-time identification of accuracy deterioration, allowing the system to maintain reliable glucose monitoring by recognizing when sensor performance has degraded.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The sensor system performs self-diagnosis by automatically detecting its own performance degradation through monitoring signal characteristics. The system identifies when it is affected by physiological responses without external intervention, enabling autonomous maintenance of measurement quality throughout the implantation period.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If sensor sensitivity is increased to improve detection, then measurement precision improves, but sensitivity to physiological interference also increases, worsening accuracy

Engineering Contradiction:

Improvesensor sensitivityVSAvoidphysiological interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The system converts the harmful effect of physiological interference into a useful diagnostic signal. By detecting characteristic patterns in signal degradation caused by dip and recover, biofouling, or encapsulation, the system identifies when accuracy has deteriorated and takes corrective action, turning interference into information about sensor status.

Inventive Principle:

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

Solution Approach 2:

The system monitors changes in signal parameters over time to detect when physiological interference affects sensor performance. By tracking parameter variations that indicate dip and recover or biofouling, the system can distinguish between normal signal variations and accuracy-deteriorating conditions.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If sensor implantation is performed to enable monitoring, then continuous glucose tracking is achieved, but trauma from insertion causes dip and recover reducing initial accuracy

Engineering Contradiction:

Improvemonitoring capabilityVSAvoidinitial sensor accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The system is prepared to handle post-implantation accuracy issues by having detection algorithms ready to identify dip and recover immediately after sensor insertion. This preliminary preparation enables the system to recognize and compensate for insertion trauma effects from the outset, maintaining monitoring reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system anticipates accuracy deterioration from insertion trauma by implementing detection mechanisms that identify dip and recover before it significantly impacts glucose monitoring. This cushioning approach ensures that even though trauma occurs, the system can detect and account for it, preserving overall measurement accuracy.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

Enhances the accuracy and reliability of glucose monitoring by compensating for transient sensitivity losses and maintaining consistent glucose data reporting, thereby extending the sensor's lifespan and improving patient care.

Implementation Method 1

Electrochemical sensors are useful in chemistry and medicine to determine the presence or concentration of a biological analyte

Methodology Applied

Scientific EffectElectrochemical sensing:

Data Source

PatentUS20250366749A1Implantable sensor devices, systems, and methods

Publication Date: 2025.12.04 DEXCOM INC

AI summary

Disclosed herein are devices, systems, and methods for a continuous analyte sensor, such as a continuous glucose sensor. In certain embodiments disclosed herein, various in vivo properties of the sensor's surroundings can be measured. In some embodiments, the measured properties can be used to identify a physiological response or condition in the body. This information can then be used by a patient, doctor, or system to respond appropriately to the identified condition.