Embossed Cell Analyte Sensor for Glucose Test Strip Manufacturing
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Solution Overview
Problem
Current methods for manufacturing glucose test strips face challenges such as limited print registration accuracy, expensive materials, gumming issues with adhesives, and calibration complexities, leading to inefficiencies and inaccuracies in analyte monitoring systems.
Innovation Solution
The development of an embossed sample chamber with a hydrophilic lidding tape and a needle and squeegee reagent application method, allowing for precise control over channel dimensions and reagent distribution, which reduces material waste and eliminates the need for user calibration by ensuring consistent calibration slopes across test strips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mesh, insulation and lidding tape arrangement is used for test strip construction, then the sample cell can be formed, but print registration accuracy and ink rheology limit the smallest size of cell that can be manufactured repeatably
Solution Approach 1:
The patent replaces the ink-based printing system with a mechanical embossing system that uses raised features on the substrate to define the sample cell boundaries. This mechanical approach eliminates print registration errors and ink rheology constraints, enabling precise formation of small sample cells without the limitations of conventional printing methods.
Solution Approach 2:
The patent changes the method of defining sample cell boundaries from chemical (ink patterns) to physical (embossed raised features). This parameter change allows for more precise control over sample cell dimensions and enables manufacturing of smaller cells with repeatable accuracy, directly addressing the limitation of conventional printing methods.
2Ease of manufacture
If mesh, insulation and lidding tape arrangement is used for test strip construction, then the sample cell can be formed, but three separate processing steps are required and materials are relatively expensive
Solution Approach 1:
The patent merges multiple functions into the substrate itself: the substrate provides both the structural base and the embossed raised features that define the sample cell. This eliminates the need for separate mesh and insulation layers, reducing the number of processing steps and material costs while maintaining the sample cell formation capability.
Solution Approach 2:
The substrate is designed to serve multiple functions simultaneously: it acts as the structural support, defines the sample cell geometry through embossed features, and provides the surface for reagent application. This multi-functionality reduces the overall component count and material requirements, addressing both manufacturing complexity and material cost concerns.
3Manufacturing precision
If die-cut spacer and hydrophilic lidding tape are used for test strip construction, then the sample cell volume can be defined, but gumming problems are often encountered when cutting pressure sensitive adhesives
Solution Approach 1:
The patent replaces the adhesive-based spacer system with a mechanical embossing system where raised features on the substrate directly define the sample cell volume. This eliminates the use of pressure-sensitive adhesives and die-cut spacers, thereby preventing gumming problems during cutting while maintaining precise sample cell volume definition.
4Productivity
If slot coating method is used for reagent application, then low viscosity reagents can be applied in a controlled manner at high speeds, but it coats areas of the web that are not functionally required causing reagent waste and height variations
Solution Approach 1:
The patent uses embossed raised features on the substrate to locally define the reagent application area. The reagent is applied only within the boundaries of the raised features, ensuring that reagent is placed precisely where needed in the sample cell. This local application method prevents reagent waste on non-functional areas while maintaining high-speed production capability.
5Productivity
If slot coating method is used for reagent application, then reagent can be applied continuously, but it creates variations in height on the sides of the sample chamber causing sealing problems
Solution Approach 1:
The embossed raised features create a defined boundary that confines the reagent to the sample cell area. Even with continuous coating application, the reagent is contained within the raised features, preventing height variations on the sides of the sample chamber. This ensures proper sealing while maintaining continuous processing capability for high productivity.
6Measurement precision
If calibration codes are provided on packaging labels requiring user entry, then strip calibration can be performed, but it requires extra user steps and potential for error
Solution Approach 1:
The patent incorporates machine-readable calibration information directly on the test strip itself, allowing the meter to automatically read and apply calibration data without requiring user intervention. The system self-calibrates by having the meter scan the calibration information printed on the strip, eliminating manual entry steps and reducing user error while maintaining calibration 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 results in highly repeatable sample chamber volumes and electrode surface areas, enhancing accuracy and reducing user error, while minimizing material costs and simplifying the calibration process.
Implementation Method 1
An opening to the channel may be provided at a distal end of the sensor so that when an analyte is applied to the opening, it is drawn into the channel by surface tension (i.e. wicking).
Implementation Method 2
An opening to the channel may be provided at a distal end of the sensor so that when an analyte is applied to the opening, it is drawn into the channel by surface tension (i.e. wicking).
Data Source
AI summary
An analyte measurement system is provided having sensors with embossed test chamber channels. In one embodiment, the sensors are elongate test strips for in vitro testing, each test strip having a substrate, at least one electrode, an embossed channel in the electrode, and lidding tape covering at least a portion of the embossed channel. Methods of manufacture are also disclosed for filling the sensor channels with reagent, and for trimming the ends of the sensors to eliminate the need for a calibration code during use of the sensors with a meter.