Transcutaneous Ethanol Detection System with Waterproof Gas-Permeable Membrane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing detection systems for monitoring alcohol levels in human sweat are prone to destruction due to water exposure and can produce false positives from environmental factors like smoke or spilled alcohol, lacking reliability and durability.
Innovation Solution
A detection system incorporating an electrochemical gas sensor with a waterproof, gas-permeable diffusion membrane and a seal to protect the measuring chamber from environmental effects, featuring a second sensor for external interference correction and a control unit for accurate ethanol detection, allowing continuous operation without maintenance for extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection system is arranged in an air- and water-permeable manner, then gas exchange and sensor functionality are improved, but the system is destroyed in a short time due to water exposure
Solution Approach 1:
The detection system is divided into separate functional zones: a water-tight sealed chamber containing the electrochemical sensor, and a permeable outer layer for gas exchange. This segmentation allows the sensor to be protected from water while maintaining gas permeability through the membrane separation.
Solution Approach 2:
A gas-permeable membrane is introduced as an intermediary between the external environment and the internal sensor chamber. This membrane allows ethanol gas to pass through while blocking water, thus protecting the sensor from water damage while maintaining detection functionality.
2Device complexity
If the detection system uses simple sensor architecture, then device complexity is reduced, but false positives occur due to environmental effects like smoke or spilled alcohol
Solution Approach 1:
The harmful influence of environmental factors is extracted and isolated from the sensor measurement area by creating a sealed chamber. Only ethanol from the user's sweat can reach the sensor through the permeable membrane, while smoke and spilled alcohol are blocked by the seal and membrane barrier.
Solution Approach 2:
The system continuously monitors the sensor signal and compares it against baseline values and threshold criteria. The control unit processes the sensor data in real-time, providing feedback to distinguish between legitimate ethanol excretion and environmental interference patterns, thereby reducing false positives.
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 system provides reliable, long-term detection of ethanol levels in sweat with reduced false positives, maintaining functionality in wet conditions and accurately differentiating between internal ethanol excretion and external interference.
Implementation Method 1
substances excreted by the user via his skin can be fed through a waterproof, gas-permeable diffusion membrane to the at least one first sensor
Implementation Method 2
the at least one first sensor is an electrochemical gas sensor, and wherein the at least one first sensor is configured at least for detecting ethanol
Data Source
AI summary
A detection system (100) detects at least ethanol in human sweat. The detection system (100) includes at least one sensor (105) that is an electrochemical gas sensor. The at least one sensor (105) is configured at least for the detection of ethanol. The detection system (100) further includes a measuring chamber (107), in which substances excreted by the user via the user's skin can be fed via a waterproof, gas-permeable diffusion membrane to the at least one sensor (105). The detection system (100) further includes at least one seal (127), which is configured to be brought into direct contact with the skin of a user and to protect at least the measuring chamber (107) from environmental effects.