CGM Sensor Reinsertion Detection Using Identifier Usage Limits
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Solution Overview
Problem
CGM systems face challenges in detecting the reinsertion of used sensors and preventing their reuse beyond the predetermined usage limit, which can compromise health and performance.
Innovation Solution
A continuous glucose monitoring (CGM) system with a sensor unit memory and a processor that reads and matches sensor identifiers, determines if a sensor has met its usage limit, and stops operation when reuse is detected, using unique identifiers and usage limits stored in memory to differentiate between new and reused sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If sensor reuse is allowed to extend monitoring duration, then the duration of action of stationary object is improved, but the reliability deteriorates due to compromised health and performance
Solution Approach 1:
The system performs preliminary actions by storing sensor identifiers and usage limits in memory before reinsertion occurs. When a sensor is reinserted, the processor automatically checks the stored identifier against the newly inserted sensor's identifier and determines if the usage limit has been reached, preventing reuse beyond the predetermined duration without requiring manual intervention.
2Reliability
If sensor reinsertion detection is implemented, then the reliability is improved by preventing expired sensor use, but the device complexity increases due to additional memory and processing requirements
Solution Approach 1:
The system creates a copy of the sensor's unique identifier stored in memory during initial use. When the sensor is reinserted, the processor compares the newly inserted sensor's identifier against the stored copy to detect reinsertion. This copying mechanism enables reliable detection of sensor reuse with minimal additional hardware complexity.
3Reliability
If usage limit enforcement is implemented, then the reliability is improved by ensuring accurate glucose monitoring, but the ease of operation deteriorates due to automatic operation stopping
Solution Approach 1:
The system implements feedback by continuously monitoring sensor usage duration and comparing it against the predetermined usage limit stored in memory. When the usage limit is reached or exceeded, the processor automatically stops sensor operation and can notify the user, ensuring that glucose monitoring accuracy is maintained while providing clear feedback about the enforcement action.
Data Source
AI summary
A continuous glucose monitoring (CGM) system is configured to detect a reinserted CGM sensor. The system reads a CGM sensor identifier stored in a CGM sensor unit memory in response to insertion of a CGM sensor into the skin of user. The system compares the identifier to any previously-stored identifiers of previously-inserted CGM sensors. If the identifier does not match a previously-stored identifier, indicating a newly-inserted sensor, the identifier is stored and CGM may begin. If the identifier matches a previously-stored identifier, indicating a reinserted sensor, a usage limit corresponding to the stored identifier of the reinserted sensor is then checked to determine whether it has been met. If it has, CGM is halted. If it has not, CGM may continue with the reinserted CGM sensor. Methods of detecting reinsertion and usage limits of a CGM sensor are also provided, as are other aspects.