Multi-layer pad enzyme stability via segmentation
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Solution Overview
Problem
Existing hydrogel compositions used for transdermal analyte sampling face issues with enzyme leaching, which affects the stability and accuracy of analyte concentration determination.
Innovation Solution
A multi-layer pad is designed with a first layer containing an enzyme for analyte detection, a second layer made of a skin-conforming material, and optionally a third layer, where the enzyme is strategically located between the second and third layers to prevent leaching and enhance stability, using materials like hydrogels and cross-linked polymers for optimal skin contact and diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer hydrogel composition is used for transdermal sampling, then the composition can provide contact with the skin and facilitate analyte diffusion, but the enzyme tends to leach from the composition, reducing stability and accuracy
Solution Approach 1:
The pad is divided into multiple functional layers: a first layer containing the enzyme for analyte detection, a second layer made of skin-conforming material for contact, and optionally a third layer. This segmentation isolates the enzyme within the first layer, preventing it from leaching while maintaining its detection function.
Solution Approach 2:
The pad uses a composite structure combining different materials in separate layers: an enzyme-containing layer (first layer), a skin-conforming hydrogel layer (second layer), and optionally a third layer. This composite approach allows each layer to perform its specific function optimally while working together as a unified system.
2Measurement precision
If the enzyme is placed directly in contact with the skin through a single-layer hydrogel, then analyte diffusion is facilitated, but the enzyme is exposed to conditions that cause leaching and degradation
Solution Approach 1:
The pad structure segments the enzyme-containing first layer from direct skin contact by inserting the skin-conforming second layer in between. This allows the enzyme to remain in a stable environment within the first layer while still enabling analyte diffusion through the layered structure for accurate measurement.
3Reliability
If a multi-layer pad structure is implemented to prevent enzyme leaching, then enzyme stability is improved, but the device complexity increases
Solution Approach 1:
The pad is segmented into functional layers with the enzyme contained in the first layer and skin contact provided by the second layer. This segmentation achieves enzyme stability while maintaining a relatively simple two-layer structure that is easier to manufacture and apply compared to more complex multi-layer alternatives.
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 multi-layer pad provides a stable and effective interface for transdermal analyte sampling, preventing enzyme leaching and maintaining long-term stability, thereby improving the accuracy and reliability of analyte concentration determination.
Implementation Method 1
The first layer includes an enzyme wherein the enzyme is adapted to assist in determining the analyte concentration
Implementation Method 2
a composition, such as a hydrogel, is placed on the skin and assists in facilitating diffusion of analytes from a user's skin to a sensing instrument
Data Source
AI summary
A multi-layer pad that is adapted to be used in determining an analyte concentration is disclosed. The multi-layer pad includes a first layer, a second layer, and a third layer. The first layer includes an enzyme wherein the enzyme is adapted to assist in determining the analyte concentration. The second layer is attached to a first surface of the first layer. The second layer is made of a skin-conforming material. The third layer is attached to a second surface of the first layer wherein the first layer is located between the second layer and the third layer. It is contemplated that the multi-layer pad may also be a two layer system.