Active Sweat Coupling Component for Biosensing
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Solution Overview
Problem
Current sweat sensing technologies face limitations in efficiently collecting and accurately sensing sweat analytes due to challenges in achieving adequate pressure seals on the skin surface, particularly at low sweat generation rates, which can lead to contamination and reduced data accuracy.
Innovation Solution
The device incorporates an active sweat coupling component that uses electrowetting or thermal mechanisms to actively transport sweat samples into fluid communication with analyte-specific sensors, ensuring effective sampling and reducing contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If passive sweat collection methods are used, then device complexity is reduced, but measurement precision deteriorates due to contamination and inadequate sampling at low sweat generation rates
Solution Approach 1:
The patent replaces passive mechanical wicking mechanisms with an active electrowetting-based sweat coupling system. The electrowetting mechanism uses electrical fields to control liquid transport, enabling precise sweat sample introduction into the sensing chamber without relying on passive capillary action, thereby improving measurement precision while accepting increased device complexity
Solution Approach 2:
The patent introduces a hydrophobic coating as an intermediary layer between the sweat source and the sensing chamber. This coating acts as a selective barrier that prevents contamination while allowing controlled sweat transport, improving analyte sensing accuracy by ensuring sample purity
2Reliability
If passive wicking is used for sweat transport, then device complexity is minimized, but reliability deteriorates due to inadequate pressure sealing and contamination at low sweat rates
Solution Approach 1:
The patent replaces passive wicking with an active electrowetting system that uses electrical actuation to control sweat transport. This substitution enables reliable sweat sampling under varying sweat generation rates by actively managing the fluid transport process, improving reliability while increasing device complexity
Solution Approach 2:
The patent employs electrowetting to dynamically change the wettability parameters of the sweat coupling surfaces. By adjusting electrical voltage, the system can control sweat transport rates and maintain reliable sampling across different physiological conditions, accepting the added complexity of electrical control systems
3Measurement precision
If active electrowetting mechanisms are used for sweat transport, then measurement precision is improved through controlled sample introduction, but use of energy increases
Solution Approach 1:
The patent uses electrowetting to replace passive transport mechanisms, enabling precise control over sweat sample introduction. This electrical actuation method improves measurement precision by ensuring consistent sample delivery while consuming energy, representing a trade-off accepted to achieve reliable analyte detection
Solution Approach 2:
The electrowetting system operates using periodic or pulsed electrical actuation rather than continuous power application. This periodic operation mode improves measurement precision through controlled sample introduction while reducing overall energy consumption by activating the electrowetting mechanism only when needed
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 enhances the efficiency and accuracy of sweat analyte sensing by maintaining a positive pressure seal and preventing contamination, even at low sweat generation rates, thereby improving data reliability and consistency.
Implementation Method 1
The device incorporates an active sweat coupling component that uses electrowetting or thermal mechanisms to actively transport sweat samples into fluid communication with analyte-specific sensors
Implementation Method 2
The device incorporates an active sweat coupling component that uses electrowetting or thermal mechanisms to actively transport sweat samples into fluid communication with analyte-specific sensors
Data Source
AI summary
A device (100) for sensing a first analyte in sweat on skin includes an analyte-specific sensor (120) for sensing the first analyte and an active sweat coupling component (130) for transporting at least one sweat sample inside the device (100) and into fluid communication with the analyte-specific sensor (120). A method of sensing a first analyte in sweat on skin includes actively transporting at least one sweat sample into fluid communication with an analyte-specific sensor (120) for sensing the first analyte using an active sweat coupling component (130) and sensing the first analyte using the analyte-specific sensor (120).