Non-Invasive Wetness Sensor Array for Absorbent Articles
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Solution Overview
Problem
Existing absorbent articles with integrated wetness indicators face manufacturing challenges and do not provide information on the level of wetness, leading to premature or delayed changes, as they require modifications to the manufacturing line and do not accurately indicate saturation levels.
Innovation Solution
A system comprising a signaling device with a detection circuit and a sensor array on an elongated substrate that can be attached to conventional absorbent articles, allowing for non-invasive monitoring of wetness levels by measuring electrical properties such as impedance or capacitance, providing alerts when the article reaches a predetermined level of saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conductors are incorporated into the absorbent article to detect wetness, then wetness detection capability is improved, but manufacturing complexity and disruption to the manufacturing line increases
Solution Approach 1:
The system is divided into separate modular components: a sensor array with multiple sensors on an elongated substrate and a signaling device with detection circuitry. This segmentation allows the sensing function to be added without integrating conductors into the absorbent core itself, simplifying manufacturing while maintaining detection capability.
Solution Approach 2:
The patent introduces an intermediary measurement layer between the absorbent core and the user, consisting of the sensor array placed on or near the absorbent article. This intermediary detects wetness indirectly through electrical property changes in the absorbent material, avoiding the need to embed conductors within the core structure.
2Measurement precision
If conductors are incorporated into the absorbent article to detect wetness, then wetness detection capability is improved, but the manufacturing process is disrupted
Solution Approach 1:
The sensing system is segmented into removable sensor arrays that can be attached to conventional absorbent articles without modifying the manufacturing line. This allows standard absorbent articles to be produced using existing processes, while the sensing capability is added as a separate, easily attachable component.
Solution Approach 2:
The sensor array creates an external measurement interface that copies the wetness detection function without requiring physical integration into the absorbent core. The sensors measure electrical properties of the absorbent material from the outside, replicating the detection capability that would otherwise require embedded conductors.
3Reliability
If a single wetness indicator is used, then the article can detect when wet, but it does not provide information on the level of wetness
Solution Approach 1:
The sensor array is divided into multiple discrete sensors positioned at different locations within the absorbent article. Each sensor independently measures local wetness conditions, and the signaling device processes these multiple measurements to provide graded feedback about the overall wetness level, transforming a binary detection system into a multi-level measurement system.
Solution Approach 2:
The signaling device provides feedback to the user about the wetness status of the absorbent article. By processing signals from multiple sensors and comparing them against threshold values, the system provides graduated feedback indicating different levels of wetness saturation, enabling users to understand the article's fullness status rather than receiving a simple wet/dry indication.
4Ease of manufacture
If conventional absorbent articles are used without wetness indicators, then manufacturing is simple, but users cannot determine when the article needs changing
Solution Approach 1:
The sensor array acts as an intermediary measurement interface that can be attached to conventional absorbent articles without modifying their manufacturing. The sensors detect electrical property changes in the absorbent material and transmit this information to the signaling device, providing wetness status information while keeping the absorbent article itself unchanged and manufacturable by standard processes.
Solution Approach 2:
The sensor array and signaling device form a universal monitoring system that can be attached to various conventional absorbent articles. The system performs multiple functions: detecting wetness, determining saturation levels, and providing user feedback, all while being compatible with standard absorbent article designs and manufacturing processes.
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
Enables caregivers or wearers to determine when absorbent articles need to be changed based on specific wetness levels without disrupting manufacturing processes and provides accurate saturation information, ensuring timely changes and reducing the risk of skin irritation or leakage.
Implementation Method 1
measuring electrical properties such as impedance or capacitance
Implementation Method 2
measuring electrical properties such as impedance or capacitance
Data Source
AI summary
A wetness monitoring system is provided for an absorbent article, the wetness monitoring system including a signaling device including an alarm to indicate that the absorbent article has reached an insult limit. The signaling device operates with a sensor array which is disposed on the outermost surface of the absorbent article outer cover. The signaling device includes a detection circuit which measures changes in inductance or capacitance. The wetness monitoring system does not make direct contact with the absorbent structure located within an outer cover of the absorbent article.