CGM Sensor Calibration Using Fabrication Measurements
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Solution Overview
Problem
Existing continuous glucose monitoring (CGM) sensors require inconvenient and burdensome fingerstick measurements for calibration, leading to inaccuracies due to physiological lag and manufacturing variations, which compromise user experience and accuracy.
Innovation Solution
Calibration models are developed using fabrication process measurement data to convert electrical signals from sensing elements into calibrated measurement parameters, eliminating the need for fingerstick measurements by associating fabrication data with calibration factors and personal patient data to determine accurate physiological conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fingerstick measurements are used for calibration, then measurement accuracy can be achieved, but user convenience and ease of operation deteriorate due to increased patient burden and complexity
Solution Approach 1:
The patent applies preliminary action by performing calibration during the manufacturing process itself, before the sensor is implanted in the patient. Fabrication process measurements are taken and used to determine calibration factors, so that when the sensor is later used in the body, calibration is already complete. This eliminates the need for post-implantation fingerstick measurements while maintaining accuracy.
Solution Approach 2:
The sensor performs self-calibration using its own fabrication process measurements. The calibration factors are determined from measurements taken during manufacturing (such as electrochemical impedance spectroscopy) and are stored with the sensor. This self-service approach eliminates the need for patient involvement in calibration while ensuring each sensor is calibrated to its specific manufacturing characteristics.
2Measurement precision
If fingerstick measurements are used for calibration, then calibration can be performed, but time consumption and loss of time increase due to the calibration process and physiological lag
Solution Approach 1:
Calibration is performed in advance during manufacturing before the sensor reaches the patient. Fabrication process measurements are taken and calibration factors are determined during production, eliminating the time required for post-implantation calibration. The sensor is ready for immediate use without requiring time-consuming fingerstick measurements.
3Ease of operation
If fabrication process measurements are used for calibration, then ease of operation improves by eliminating fingerstick measurements, but manufacturing precision requirements increase to ensure calibration accuracy
Solution Approach 1:
The patent implements feedback by using fabrication process measurements (such as electrochemical impedance spectroscopy) to determine calibration factors that compensate for manufacturing variations. The calibration process incorporates feedback from manufacturing measurements to adjust and normalize sensor performance, ensuring accuracy despite variations in fabrication processes. This feedback mechanism allows manufacturing precision requirements to be managed through active compensation rather than requiring extremely tight tolerances.
Data Source
AI summary
Medical devices and related systems and methods are provided. A method of controlling medication delivery based on sensor input involves obtaining a measurement parameter representing an electrical response of a first instance of a sensing element to a physiological condition of a person. The measurement parameter is converted into a calibrated measurement parameter using calibration data specific to the first instance of the sensing element. The method further involves determining a measurement value using the calibrated measurement parameter as input to a performance model. The performance model is derived from historical calibrated measurement parameters and corresponding reference values. The historical calibrated measurement parameters are from other instances of the sensing element. A command is then determined based on the measurement value and sent to a medical device. The command causes the medical device to deliver a dose of medication influencing the physiological condition of the person.