Blood Glucose Test Strip Barcode Calibration
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Solution Overview
Problem
Existing blood glucose test strips face challenges in compactly encoding identification data and calibrating for insertion speed and moisture content, leading to potential errors in glucose level readings due to limited space and cost constraints in incorporating RFID chips or sophisticated optical readers.
Innovation Solution
Incorporating a data barcode and a clock code on the test strip, where the clock code compensates for insertion speed and moisture content errors by generating electrical signals that calibrate the data barcode, allowing for accurate data retrieval despite inconsistent insertion speeds and dampening effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID chips or sophisticated optical readers are incorporated to improve data encoding and calibration accuracy, then measurement precision and reliability improve, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses a simplified optical reader that captures an image of the barcode on the test strip and processes it through software algorithms rather than using complex hardware decoders. The barcode pattern itself serves as a calibration reference, eliminating the need for separate calibration components. This copying approach allows accurate reading while keeping the hardware simple.
Solution Approach 2:
The barcode structure serves multiple functions simultaneously: it provides product identification information and acts as a calibration reference for insertion speed compensation. This multi-functionality eliminates the need for separate calibration markers or components, reducing overall device complexity while maintaining measurement precision.
2Reliability
If RFID chips or sophisticated optical readers are incorporated to improve data encoding and calibration accuracy, then reliability improves, but manufacturing cost increases
Solution Approach 1:
Instead of expensive RFID chips, the patent uses a printed barcode that can be manufactured using standard printing processes. The barcode pattern is copied onto the test strip during normal manufacturing, avoiding the need for expensive electronic components while maintaining reliability through software-based verification and calibration.
Solution Approach 2:
The patent employs a disposable barcode pattern that is printed on each test strip rather than using expensive reusable RFID tags. This approach accepts the disposable nature of test strips while using the low-cost barcode technology to achieve reliable identification and calibration, significantly reducing per-unit manufacturing costs.
3Loss of information
If a data barcode is encoded on the test strip to provide identification data, then information content increases, but the limited space on the test strip constrains the encoding capacity
Solution Approach 1:
The patent encodes multiple layers of information within the barcode structure by using different bar widths to represent different data values (similar to how QR codes use multiple dimensions). This allows compact encoding of extensive identification and calibration data within the limited linear space available on the test strip.
Solution Approach 2:
The barcode uses variable bar widths as a parameter to encode different data values, allowing multiple bits of information to be represented in a compact spatial format. This parameter-based encoding maximizes the information density within the constrained test strip area.
Data Source
AI summary
A blood glucose test strip includes a test strip, a blood test area formed on a first end of the test strip, an electrode formed on a second end of the test strip, a data barcode formed on the test strip, and a clock code formed on the test strip. The data barcode may include a plurality of first bars with spaces separating the first bars, each first bar having a width. The clock code may comprise a fixed pattern of second bars with spaces separating the second bars, a width of each second bar set according to the width of at least one of the first bars. The clock code can be used to calibrate the data barcode to compensate for insertion speed and/or moisture content.