Orientation Independent Meter Test Strip Detection
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Solution Overview
Problem
Existing blood glucose measurement systems face difficulties in accurately determining the orientation of test strips, leading to incorrect insertions and potential errors in glucose level readings, particularly for users who struggle with properly aligning small test strips.
Innovation Solution
The system employs a test strip design with distinct orientation indicators, such as projections or indentations, and a corresponding analyte meter with detection mechanisms like conductive switches or optical sensors to determine the strip's orientation upon insertion, ensuring correct electrical connections and glucose measurement signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the test strip is made small for portability, then the device compactness is improved, but the difficulty of correctly orienting the test strip increases
Solution Approach 1:
The patent applies visual indicators (color-coded regions or patterns) on the test strip to indicate correct orientation. These visual cues allow users to quickly identify the proper insertion direction without requiring complex mechanical features, thus maintaining small size while improving ease of operation.
Solution Approach 2:
The test strip incorporates asymmetric features such as a directional indicator (e.g., an arrow or asymmetric pattern) that is easily visible and distinguishes the correct insertion orientation. This asymmetric design allows users to rapidly determine proper orientation even with small test strips, resolving the contradiction between compactness and ease of operation.
2Measurement precision
If the meter requires precise orientation detection, then the measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical orientation detection mechanisms with simpler optical or electrical sensing systems. For example, an optical sensor detects reflective patterns or color codes on the test strip to determine orientation, eliminating the need for complex mechanical switches or physical alignment features while maintaining measurement precision.
Solution Approach 2:
The test strip includes self-identifying features (such as embedded conductive patterns, optical codes, or asymmetric contact pad arrangements) that automatically communicate their orientation to the meter upon insertion. The meter's processor automatically interprets these features to determine correct orientation, eliminating the need for complex active detection systems and reducing overall device complexity while ensuring measurement accuracy.
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
This approach ensures accurate and reliable glucose measurements by consistently determining the test strip's orientation, reducing user error and improving the reliability of blood glucose monitoring.
Implementation Method 1
The test member has a first major surface and an opposing second major surface, each surface including an orientation indicator region having a different optical property. The test meter has an optical orientation sensor aligned with the orientation indicator region of one major surface of the test member.
Data Source
Figure 1A~1B
Figure 2A~3B
Figure 4A~4E
AI summary
An analyte meter with a test strip port that detects an orientation of a test strip inserted therein. A control circuit of the test meter is configured to apply a first predetermined analyte measurement signal to a test strip electrode in response to detecting a first orientation of the test strip, and a second predetermined analyte measurement signal to the same, or a different, electrode in response to detecting a second orientation of the test strip.