CGM Sensor Tracking Insertion Removal Times
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Solution Overview
Problem
Existing continuous glucose monitoring (CGM) systems lack the ability to track the insertion and removal times of sensors effectively, leading to potential health risks from reused sensors that may have exceeded maximum removal time limits.
Innovation Solution
A CGM system that includes a processor, a real-time clock, and memory to read and store sensor identifiers and time stamps, allowing it to determine whether a sensor has been reinserted and if it has exceeded its maximum removal time limit, thereby preventing its use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor reuse is allowed without tracking, then device complexity is reduced, but reliability deteriorates due to potential health risks from exceeded removal time limits
Solution Approach 1:
The system performs preliminary actions by storing the identifier and insertion time stamp in memory before the sensor is removed. This allows the system to later determine whether the sensor has exceeded its maximum removal time limit by comparing the current time with the stored insertion time, thereby preventing unsafe reuse without requiring complex real-time monitoring during sensor removal.
Solution Approach 2:
The system creates a digital copy of the sensor's identifier and insertion time information in memory. This copied information is then used to track and verify sensor usage duration, enabling reliability verification through data comparison rather than physical sensor features or complex hardware tracking mechanisms.
2Reliability
If sensor insertion and removal times are tracked, then reliability is improved by preventing reuse of exceeded sensors, but device complexity increases due to additional memory and processing requirements
Solution Approach 1:
The system stores the insertion time stamp in memory at the time of sensor insertion, creating a reference point for later verification. This preliminary data capture enables simple time-based comparison to determine if the sensor has exceeded its maximum removal time limit, avoiding the need for continuous monitoring or complex algorithms.
Solution Approach 2:
The system uses its own internal real-time clock and stored insertion time to automatically determine whether the sensor has exceeded the maximum removal time limit. This self-service approach eliminates the need for external tracking devices or complex verification systems, as the CGM device itself performs the verification using its built-in resources.
3Reliability
If maximum removal time limit verification is implemented, then reliability is improved by ensuring sensor safety, but ease of operation deteriorates due to additional user interaction requirements
Solution Approach 1:
The system automatically performs the verification of maximum removal time limit by comparing the current time with the stored insertion time stamp. This automated self-service verification eliminates the need for manual user input or complex interaction, as the system independently determines whether the sensor has exceeded its safe usage duration and prevents reuse accordingly.
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
The system effectively tracks sensor insertion and removal times, preventing the reuse of sensors that have exceeded their maximum removal time limits, thus ensuring user safety and maintaining the accuracy and reliability of glucose monitoring.
Implementation Method 1
The sensor interacts with the interstitial fluid, generating electrical signals that are proportional to the amount of glucose present
Data Source
AI summary
In response to insertion of a continuous glucose monitoring (CGM) sensor into the skin of user, a CGM system compares an identifier of the sensor to any previously-stored identifiers of previously-inserted sensors. If the identifier does not match a previously-stored identifier, indicating a newly-inserted sensor, the identifier and a time stamp are stored and CGM may begin. Upon removal of the sensor, a removal time stamp is stored. If the identifier of an inserted sensor matches a previously-stored identifier, indicating a reinserted sensor, a reinsertion time is obtained and an elapsed removal time is checked to determine whether it exceeds a maximum removal time limit. If it does, CGM is halted. If it does not, CGM may continue with the reinserted sensor. Methods of tracking insertion and removal times of a CGM sensor are also provided, as are other aspects.