Capacitive Sensing Decoder for Glucose Meter Test Strips
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Solution Overview
Problem
Existing code readers, such as barcode and QR code readers, are costly and complex, and manual entry of information by users is prone to errors, particularly in critical applications like glucose meter calibration, where inaccuracies can lead to serious health risks for diabetes patients.
Innovation Solution
A low-cost capacitive sensing system that encodes information on a pattern using a spatial arrangement of conductive and non-conductive regions, allowing electrodes to detect changes in electric fields and decode the information using a decoder, which is more cost-effective and less complex than optical solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical code readers (barcode/QR code readers) are used to decode information, then decoding accuracy is improved, but device cost and complexity increase significantly
Solution Approach 1:
The patent replaces optical sensing mechanisms (light sources, lenses, optical sensors) with a capacitive sensing system using electrodes and electronic circuitry. The decoder uses capacitive coupling between electrodes and conductive regions on the test strip to detect binary information, eliminating the need for complex optical components while achieving accurate decoding.
Solution Approach 2:
The patent encodes information as binary data (0s and 1s) on the test strip using conductive and non-conductive regions, creating a simplified digital representation that can be read by the capacitive decoder. This binary encoding scheme allows accurate information storage and retrieval without requiring complex optical recognition algorithms.
2Device complexity
If manual code entry by users is implemented, then device cost is reduced, but user error rate increases significantly
Solution Approach 1:
The system automatically decodes the batch identifier from the test strip itself through capacitive sensing, eliminating the need for manual user input. The decoder autonomously reads the binary pattern on the strip and retrieves the corresponding batch information, ensuring accuracy without requiring user intervention.
Solution Approach 2:
The manual typing action is replaced with automatic capacitive sensing and electronic decoding. The electrodes detect the conductive pattern on the strip, and the decoder circuitry automatically translates this into batch identification, removing human error from the process.
3Device complexity
If capacitive sensing electrodes are used to decode information, then device cost and complexity are reduced, but decoding reliability may be compromised
Solution Approach 1:
The patent uses a binary encoding scheme where conductive regions represent 1s and non-conductive regions represent 0s. This simplified digital representation is inherently reliable and easy to decode, as it reduces the problem to detecting the presence or absence of capacitance coupling, which the electronic circuitry can do accurately.
Solution Approach 2:
The capacitive sensing system serves multiple functions: it detects the binary pattern on the strip, decodes the batch identifier, and verifies the test strip authenticity. This multi-functional approach ensures reliability while keeping the system simple and cost-effective.
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 provides accurate and reliable decoding of information, reducing the risk of user errors and improving safety in applications like glucose meter calibration by using a capacitive sensing technique to encode and decode information on consumable test strips.
Implementation Method 1
the mechanism employs a capacitive sensing technique. Electrodes are arranged to each generate an electric field, and sense disturbances on the electric field caused by the pattern when the pattern is positioned over the electrodes
Implementation Method 2
Electrodes are arranged to each generate an electric field, and sense disturbances on the electric field caused by the pattern
Data Source
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Figure 3
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AI summary
A low-cost system comprising a pattern arranged to encode information and a decoder for decoding the information encoded in the pattern is described. In particular, the mechanism employs a capacitive sensing technique. Electrodes are arranged (or stimulated, during operation) to each generate an electric field, and sense disturbances on the electric field caused by the pattern when the pattern is positioned over the electrodes. The spatial arrangement of the pattern allows information to be encoded on a strip or surface and decoded by capacitive sensors arranged to detect disturbances caused by possible patterns. The resulting solution is cheaper and less complex than optical solutions, e.g., barcodes and optical barcode readers. The mechanism may be used in a glucose meter for encoding and decoding an identifier for distinguishing batches of glucose meter test strips.